CSLB CONCRETE C8 LICENSE EXAM, PRACTICE EXAM AND STUDY GUIDE EXAM 2024, Exams of Construction

Download CSLB CONCRETE C8 LICENSE EXAM, PRACTICE EXAM AND STUDY GUIDE EXAM 2024 and more Exams Construction in PDF only on Docsity! 1 | P a g e CSLB CONCRETE C8 LICENSE EXAM, PRACTICE EXAM AND STUDY GUIDE EXAM 2024 WITH ACTUAL CORRECT QUESTIONS AND VERIFIED DETAILED ANSWERS |FREQUENTLY TESTED QUESTIONS AND SOLUTIONS |ALREADY GRADED A+|BRAND NEW!!|GUARANTEED ASS |LATEST UPDATE Which of the following are the recommended dry stone (aggregate) sizes commonly used in the formation of concrete? ½" to ¾" What are the standard sizes of column-base footings that form the foundation system of a concrete building? 4.5 to 12 square feet What is the recommended depth of TROWELING around the form-edges for better edge finishing of the concrete once the concrete surface has dulled substantially? About 1 inch Which of the following admixtures are commonly added to concrete to achieve better performance and quality of concrete? ALL -Retarding admixture -Water reducing admixture -Air entertaining admixture Why are vapor or moisture barriers used in concrete construction? To avoid flow - in of water moisture 2 | P a g e Which of the following factors can cause the greater cracks in the concrete? ALL - Improper watering, High temperature, Premature loading -Rapid loading, Premature loading, Excessive loading -Improper reinforce, Poor curing, Poor compaction What is the maximum ratio of silica fume with respect to the cement of the concrete that generates a negligible effect on the setting time of the concrete? Up to 10% Which of the following options is NOT related to the pre-placement concrete preparation activities? Fill - back What is the recommended slump value for a normal reinforced cement concrete (RCC)? 2" to 4" What is the minimum ratio of air entraining admixture recommended when working in a freeze-thaw climate? 4 percent How much ratio of spillage should be expected while preparing the concrete to place in the desired forms? 10 percent Which of the following statements is correct about placing a 3-inch-thick sand layer over the moisture barrier before placing the concrete? ALL -Finishing time of concrete increases -Strength of the concrete increases -Fewer cracks develop What is the American Concrete Institute's recommended thickness of sand layer over the moisture barrier before placing the concrete on it? 3 inches Which of the following problems may arise if you don't finish concrete edges round, neat, and properly? 5 | P a g e About 1.1 to 1.2 Which of the following building specification and cost estimating standard systems is accepted as ASTM standard? UniFormat System Which of the following factors directly impact each other in the process of cost estimation for a concrete building project? Interest rate, Holding cost, Cost escalation Which of the following points are true about Work Breakdown Structure (WBS) in the planning of a construction project? Decomposing of a task into doable, measureable, estimable , and schedulable units Which of the following statements is correct about the finishing of a concrete? Concrete should be finished once bleed water and surface sheen disappear An excavation of 10 cubic meters is done on any soil. Which of the following statements is true about the refilling volume of that excavation with the same type of soil material? More than 10 cubic meters What type of release oil is commonly used for the construction of wooden forms in the concrete industry? Paraffin base oil Initial and final setting time values of concrete are normally considered from: Mixing of water into cement material Form-exposed corners and edges are commonly beveled to avoid any chipping by using: Chamfer strips Which of the following are the basic crafts used in estimating the concrete construction cost in the industry? Ironworker, Carpenter, Teamster, Cement mason Which of the results of a concrete slump test has the highest workability? True Slump Explanation: Workability is the ease or difficulty of placing concrete in a particular location. For example, a stiff but plastic mix with large aggregate would be workable in large open form but not in a wall with closely spaced reinforcement. Please note that the slump test is NOT a measure of workability, and it should 6 | P a g e not be used to compare mixes of entirely different proportions or containing different kinds of aggregate. What is the maximum depth of a foundation footing commonly used in concrete construction? 78" Which of the following factors should be estimated as earthwork components in project planning? ALL OF THESE -Rough grading, Excavation, Soil backfilling -Soil compacting, Fill material compacting, Excavation -Excavated soil hauling, Soil backfilling, Rough grading According to American Concrete Institute ACI-301 standard, what is the maximum volume of concrete that requires a strength test of concrete? Each 100 cubic yards What are the recommended sizes of granular for a floor slab or foundation of a small-to medium-size building? 4" to 6" Which of the following are the main objectives of applying sealers on exterior concrete surfaces? To keep salt and water out of the concrete What is the slab curling impact of direct placement of concrete on the moisture barrier as indicated by American Concrete Institute guidelines? Slab curling increases Which of the following activities are recommended before placing the concrete into the forms? Application of form release oil and water Which of the following is the standard spacing commonly used between two adjacent expansion joints on a 4" thick concrete slab? 10 to 12 feet Explanation: The general rule of thumb is that the spacing should be 2 ½ feet for each single inch of slab thickness. Which of the following characteristics should be available in a good sealant compound commonly used for expansion joint treatment? 7 | P a g e ALL -Non - toxic -Tint - less -Insoluble What is the most common size or thickness of polyethylene sheet used as a moisture barrier (with/without sand layer) in the concrete industry? 4 to 6 mil Which of the following fastening mechanisms holds the collar strongly fixed around the finished columns? Friction If you want to place a crushed stone layer over the vapor barrier, which of the following thicknesses of polyethylene is it recommended to use? 50 mil Which of the following are the types of footings commonly used in the concrete construction industry? ALL -Pad footing, Strap footing, Combined footing -Spread footing, Isolated footing, Strip footing -Mat footing, Continuous footing, Raft footing What is the minimum slope-away recommended in the final grading of foundation backfilling after the placement of concrete? ¼" per foot pitch Which of the following options is not related to concrete pouring preparation? Legal site inspector should be available on site Which of the following concrete pouring strategies works well for a long normal slab? Start from farther area of slab Which of the following pieces of equipment are commonly used for manual excavation for small buildings? Crowbar , pickaxe, shovel Explanation: The answer is crowbar, pickaxe, and shovel because of the key phrase "small buildings" in the question. 10 | P a g e Which of the following cost estimate methodologies is commonly used in a concrete construction planning project? Unit Cost Method Explanation: The unit method is the more practical approach because it uses an operational unit as the base of cost. This cost includes each and every factor required to complete an operational unit. So, the accuracy of this method is based on practical work of the same type. The ratio of cement, sand, aggregate, and water to prepare fresh/wet concrete is defined in terms of ________ not ________. Weight & Volume Which of the following ratios of moisture is recommended in a soil or granular layer to achieve the best quality of compaction? 12 percent Which of the following options is NOT a structural concrete element? ALL -Statuary -Cornices -Corbels Which of the following pieces of equipment is commonly used for small project concrete floating to give a finished look? Darby Which of the following statements is true about concrete swelling in humid or wet conditions? Swelling takes longer periods , ranging from 6 to 12 months Which of the following problems will arise if you finish the concrete surface while water bleeding and surface sheen persist? Scaling, Dusting, Blister What concrete expansion joint depth is recommended to control the plastic shrinkage cracks in concrete? 1/4 of concrete thickness The metal ties installed in the form are normally cut at least _____________ below the finished surface of concrete. 1 inch 11 | P a g e Which of the following types of concrete has the lowest drying shrinkage? Metakaolin concrete mixture According to the American Concrete Institute (ACI) Committee, which of the following conditions are exempted from installing the vapor barriers in concrete structures? ALL -When no drainage problem exists -When no soil problems exist -In the arid regions Which of the following 'productivity adjustment factors' for the earth work of sand/gravel soil should be taken while estimating the concrete project cost? 0.94 What should be done while removing false-work and concrete forms? ALL -Left - holes of wire ties and other supports should be filled in properly -Honeycombed area should be properly patched -Prying, banging , and jarring should be avoided How many divisions are there in the Master Format Building standard information list? 50 Divisions Petroleum base oil is commonly used as release oil for which of the following forms' making material? Steel Which of the following weights should be supported by the false-work structure for concrete work? Fresh concrete weight, Form weight, Equipment weight Which of the following methods are commonly used for concrete placement in the industry? Concrete P ump, Mix Truck/Chute, Crane & Bucket What are two commonly used types of planking and strutting for excavation work on a concrete construction site? Intermittent & c ontinuous 12 | P a g e What is the volume of a cylinder if the diameter equals 3 feet and the length equals to 12 feet? 84.78 cubic feet Explanation: There are two ways to solve the problem. However, regardless of which method is used, you need to first determine the area of the circle then multiply it by the length.Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 1.5 feet (half of the diameter length)Area = 3.14 x 1.5 x 1.5Area = 7.065 sq. ft.Multiply area by the length to find the volume.7.065 x 12 = 84.78Shortcut MethodArea of the circle is 78.5% of the square. Treat the circle as a square and solve for the area.Find the area of the square instead of the circle.3' x 3' = 9 sq. ft.Since circle is 78.5% of the square, multiply area of the square by 78.5% (or .785 if there is no percentage sign on the calculator).9 sq. ft. x .785 = 7.065 square feetMultiply area by the length to find the volume.7.065 x 12 = 84.78 cubic feet Where are spiral rebar ties used? In round columns Control joints in sidewalks should be spaced at what intervals? Equal to the width of the slab Explanation: Generally the control joints in sidewalks should be spaced equal to the width of the slab, but not more than 6 feet apart. One cubic foot of cement weighs approximately: 95 lbs How many cubic yard of concrete is required for a 4" slab with the diameter of 15 feet? 2 ½ cubic yards Explanation: Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 7.5 feet (half of the diameter length)Area = 3.14 x 7.5 x 7.5Area = 176.625 sq. ft.Multiply area by the depth of the slab (in feet) to find the volume in cubic feet.176.625 x .333 = 58.82 cubic feetConvert cubic feet into cubic yards.58.82 ÷ 27 = 2.18 cubic yardsSince 2.18 is not a given option, round up the number to 2.5 cubic yardsShortcut MethodThis problem can be solved using a much simpler method. First is to find the area of the square, then convert it into the area of the circle by multiplying it by 78.5%.Area of the square = 15' x 15' = 225 square feetArea of the circle = 225 x .785 = 176.625 square feetDivide the volume by 81 to solve for the cubic yards for a 4" slab.176.625 ÷ 81 = 2.18 cubic yardsSince 2.18 is not a given option, round up the number to 2.5 cubic yards The normal tolerance for the location of bends and ends of reinforcing bar is: 15 | P a g e What is the purpose of the deformed rebar? Deformations improve the bond between steel and concrete What would be the easiest way to avoid puddling under a slab? Careful grading Air-entraining: Improves the working life of concrete. What is the maximum number of parallel bars that can be bundled together and still be considered a single unit? 4 bars Explanation: According to the American Concrete Institute, groups of parallel reinforcing bars bundles in contact to act as a unit shall be limited to four in any one bundle. Shotcrete can be wet or dry. What are the advantages of wet? Exact batching What is the maximum spacing of the rebar in the stem wall? 18" Explanation: The code requires additional rebar to be used if the spacing between rebar in the stem wall exceeds 18". What is the area of the circle if the diameter is 20 feet? 314 sq. ft. Explanation: There are two ways to solve for the area of the circle.Traditional MethodUse the following formula:Area of the circle = π x r x rWhere π = 3.14 and radius (r) = 10 (half of the diameter)Area = 3.14 x 10 x 10Area = 314 sq. ft. Shortcut MethodArea of the circle is 78.5% of the square. Treat the circle as a square and solve for the area.Step 1. Find the area of the square instead of the circle.20' x 20' = 400 sq. ft.Step 2. Since a circle is 78.5% of the square, multiply the area of the square by 78.5% (or .785 if there is no percentage sign on the calculator).400 sq. ft. x .785 = 314 sq ft A standard truck load of concrete is around 10 cubic yards of material. In a pour with an average depth of 8 inches, and a width and length of 12 by 32 feet, how much will the second truck need to bring? One load was enough Explanation: 16 | P a g e Step 1. Solve for the volume of the pour: 12 x 32 x 8/12 (or 0.667) = 256.128 cubic feetStep 2. Convert cubic feet into cubic yards.256.128 ÷ 27 = 9.49 cubic yardsSince one truck carries 10 cubic yards of concrete, one truck will be enough for the pour. To ensure proper grounding, the grounding electrode must be encased by how many inches of concrete? 2" Explanation: To ensure proper grounding, the electrode must meet the following criteria:1. Must be encased by 2 or more inches of concrete2. Electrode must be at or near the bottom of the footing or foundation3. Concrete must be in contact with the ground4. At least 20 feet of rebar that is at least ½" thick or 20 feet of solid copper as a conductor Required reinforcement bar splicing length or lap length is a function of: ALL -Diameter of the reinforced bar. -Stress in the reinforced bar at the cross section of splicing. -Bond-strength between the reinforcing bar and the concrete. Bundled reinforcing bars are normally required to have a minimum cover of at least the diameter of the bundle, except in the case of permanent proximity to earth where the minimum will be: 3 inches Releasing agent is used on forms, why is over use a problem? Oil in the water makes concrete that is less strong. There are many surface finishes that can be applied to smooth finished concrete, including: Stain, Paint, Stenciling Oil, Varnish, Epoxy. What considerations should be taken into account before application? Depends on finish to be applied. Strength tests are normally: The average of 2 tests at a specified time, taken from the same pour. A mix with a higher percentage of rock has the advantage of: Being less expensive. For quick dry applications you would most commonly use which kind of concrete? Type 3 17 | P a g e You have 5 employees that work for eight hours. How much would you have to pay your employees, if one of them is an apprentice who makes $17/hour, supervisor makes $33/hour, and three journeymen make $22/hour? $928.00 Explanation: Apprentice: $17 x 8 hours = $136Supervisor: $33 x 8 hours = $264Journeymen: 3 x $22 x 8 hours = $528Total: $136 + $264 + $528 = $928 Refer to the house plan. How many square feet is the foundation slab? 1844 sq ft Explanation: The easiest way to solve for the area of the slab is to image a full rectangle of the slab and subtract void areas from the area of the slab. Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2 sq ftCenter void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net area of the foundation slab: 2013.94 - 12.2 - 21.045 - 137.505 = 1843.19 sq ft. Weather conditions may make placing concrete inadvisable, including: High winds and high temperatures Refer to the house plan. How many cubic yards of concrete needs to be ordered for the foundation slab that is 4 inches thick? 23 cubic yards Explanation: The easiest way to solve for the area of the slab is to image a full rectangle of the slab and subtract void areas from the area of the slab. Rectangle area: 28.167' x 71.5'= 2013.94 sq ftLeft void area: 6.667' x 1.83' = 12.2 sq ftCenter void area: 11.5' x 1.83' = 21.045 sq ftRight void area: 9.167' x 15' = 137.505Net area of the foundation slab: 2013.94 - 12.2 - 21.045 - 137.505 = 1843.19 sq ft.Traditional Method:Multiply the area of the slab by the thickness of the slab (in inches).1843.19 x 0.333' = 613.78 cubic feetConvert the volume into cubic yards.613.78 ÷ 27 = 22.73 cubic yards (rounded up to 23 cubic yards)Industry Method:Divide the area by 81 to get cubic yards.1843.19 sq ft ÷ 81 = 22.76 cubic yards (rounded up to 23 cubic yards) What is the spacing of anchor bolts from ends of sill plates? 4" min, 12" max In a beam not exposed to weather or soil; what is the minimum coverage for #4 reinforcing bar: 20 | P a g e Explanation: Specifications usually require a minimum of 1 minute mixing for mixtures of 1 cu yd capacity. It increases 15 seconds for each additional ½ cu yd of additional mixture. What class of formwork is used for temporary or light loads? Class I Explanation: Class I - used for temporary or for light loadsClass II - used for structures that will encounter heavy loads Construction joints are: Joints designed to separate one pour from another. How many cubic yard of concrete is required for the footing shown, if it is 75 feet long? 2 ½ cubic yards Explanation: Step 1: Figure out the area of the face of the footing.Top area = 6" x 9" = 54 square inchesBottom area = 6" x 12" = 72 square inchesTotal area = 54 + 72 = 126 square inchesStep 2: Convert square inches into square feet.126 ÷ 144 = 0.875 square feetStep 3: Get volume by multiplying the previous answer by the length.0.875 x 75 = 65.625 cubic feetStep 4: Convert cubic feet into cubic yards.65.625 ÷ 27 = 2.43 cubic yardsSince there is no exact answer, round up the number. Which of the following will cause the concrete to lose its strength? Too much water When would a slab be double reinforced? To strengthen a slab that would otherwise need to be thicker, to meet expected loads. Compacting placed concrete is advisable because of: Higher cured strength. Which of the following is a normal curing temperature? 75°F Explanation: The normal curing temperature is 75°F. Most manufacturers specify a range between 50 and 85°F. Please refer to the house plan. How many square feet does the patio cover (excluding sidewalk)? 460 sq ft Explanation: Break down the area of the patio into 4 sections as shown in this diagram. 21 | P a g e Area A: 34.167 x 9.333 = 318.89 sq ftArea B: 9.167 x 15 = 137.5 sq ftTotal Patio Area: 318.89 + 137.5 = 456.39Since the answer of 456.39 or 457 is not provided, choose the best possible answer which is 460 sq ft. What is the area of a cylinder that has a radius of 6 inches and height of 8 feet? 25.12 sq. ft. Explanation: To solve for the area of a cylinder, multiply circumference by the height of the cylinder. Don't forget that the radius is given in inches, but height is given in feet.Step 1: Find Circumference.Diameter = radius x 2Diameter = 6" x 2 = 12 inches or 1 footCircumference = D x π (or 3.14)1 x 3.14 = 3.14 feetStep 2. Find the Area.Area = circumference x heightArea = 3.14 x 8Area = 25.12 Which of the following tests used to measure the consistency of the concrete? Slump test Explanation: Slump test is used to measure the consistency of the concrete.Compressive test is used to determine whether a concrete has the specified compressive strength. What is the minimum width of the footing for a 2-story house? 15" What is the concrete mixture ratio of 1:2:4? Standard Explanation: The mixture ratio of 1:2:4 stands for 1 part cement, 2 parts of sand or fine aggregate, and 3 parts of coarse aggregate.Here is all of the mixture ratios:Lean 1:3:6Medium 1:2 ½:5Standard 1:2:4Rich 1:2:3 What is the minimum concrete cover, if rebar is cast against and permanently exposed to earth? 3 inches Explanation: Concrete cover as protection of reinforcement against weather and other effects is measured from the concrete surface to the outermost surface of the steel. This is also known as concrete tolerance for reinforcement. In most cases, this means that rebar should be encased 3 inches in concrete. If the concrete is not in direct contact with soil/weather, then the encasement can be less than 3 inches. What is the minimum required thickness for a slab? 3 ½" Explanation: 22 | P a g e Although most concrete slabs are 4", according to code the minimum permissible thickness for the slab is 3 ½". From an engineering perspective, concrete has the advantage of high compressive strength. Maximum strength is reached after: 28 days The average deadload of dry concrete, including reinforcement, is: 150 lbs/sq ft. Green concrete is: Concrete that has been treated for water exposure Which of the following has the highest Load Bearing-Value? Bedrock What size is the #3 rebar? 3/8" Explanation: The rebar comes with 1/8" increments. #1 rebar is 1/8", whereas #3 rebar is 3/8" thick. The concrete stem walls must have #4 rebar ___ from the top of the footing as well as ___ from the bottom of the footing. 3" What is the minimum depth of a footing below the soil? 12" What is the maximum spacing of the anchor bolts for 1-story house? 6' o. c. It is important to keep the work site tidy and clear of debris, especially used lumber and used forms. Why? To reduce risk of accidents. What is the minimum width of the footing for a 1-story house? 12" What is the maximum spacing of the anchor bolts for a 2-story house? 4' o. c. High-early: 25 | P a g e Air entrainment admixtures The fly ash which is used as SCM has the specific gravity ___________________. 1.9 - 2.8 The leveling operation that removes lumps and hollows and provides a true and uniform concrete surface is called ______________________. Screeding If the quantity of concrete is less than _____________ cubic yards, the compliance test reports are not required. 50 Which type of Portland cement is used when early strength is expected? Type ||| Which of the following factor influence the positioning of the joints in a slab on grade? ALL OF THESE -Sub grade conditions -Finishing requirements -Temperature Which of the following is NOT a property of concrete? High tensile strength The concrete work is done in freezing zones, it gets cured by ______________. Steam Explanation: It is done by heating concrete by steam or using alternating current, so that water content in the concrete is not increased. Coarse aggregate in concrete is the material that is retained in sieve number ____________. #4 Explanation: The one which passes through sieve #4 is the fine aggregate. All of the structural steel is considered satisfactory even if it is rusted, but still meets the density requirements, except ___________________. Pre stressing steel 26 | P a g e Explanation: If the pre stressing steel is rusted, it cannot be used since it does not meet the compliance requirements. The compressive strength of concrete when treated with a 4" cube is always ____________ than when tested with a 6" cube. More The practice of making concrete to achieve the stipulated minimum strength and durability and to make concrete in the best economical manner is called _________________. Mix design Explanation: Mix design uses the theoretical calculations to get the desired higher strength in concrete but yet consuming minimum cement. What is the purpose of using SCM in concrete other than meeting workability requirements? To avoid emissions: The cement production is responsible for 7% of the greenhouse gas emissions (GHG). If the contractor has to transport the concrete, what is the specified time for the concrete after catching under normal circumstances? Before 1 1/2 hours Explanation: Or before 250 revolutions of the drum What is NOT a key purpose in using SCM in concrete? Short term curing period The rough concrete finishes are generally appropriate for surfaces subject to _______________. Traction Why would the cylindrical/circular columns be chosen over the square/rectangular columns? Circular columns carry more load. Explanation: For the given cross section area, circular columns carry more load as compared to square/rectangular columns. The size of the vibration needle to be used for concrete vibration for slab is ______________ inch. 3/4" (20mm) 27 | P a g e Explanation: It is based on the thickness of the slab, generally 3/4" needle is used and in rare cases 1 1/2" needle is also used. What are the compliance requirements that the concrete must meet to pass the acceptance test? ALL OF THESE! -Homogeneity -Strength -Workability The additives used to enhance the performance of concrete for the special purposes is/are called: Chemicals Explanation: Shall not be confused with admixtures Which of the following are the factors that affect the pulse velocity measurement on concrete? ALL OF THESE! Explanation: -Temperature on concrete -Presence of reinforcing steel -Smoothness of the surface Which of the following is NOT a concrete curing method? Water entrapment curing "Specific performance admixtures" are the admixtures that can provide a desired performance characteristics other than: ALL OF THESE -Reducing water content -Changing the setting time -Changing the functionality Construction joints in the pavement are generally created by ___________________. ALL OF THESE! -Scoring concrete with a grooving tool -Rounding corners with the edger tools -Saw cutting the hard concrete 30 | P a g e Mix design is done based on the strength requirements and with theoretical calculations. The given options belong to concrete for general purposes. In which of the following ways listed is the minor concrete different from the general concrete? ALL OF THESE! -Less cementitious material -Recycled aggregate use -Use of Rice Hull Ash (ASH) Explanation: These are not allowed in general concrete Hope is the water content managed during the concrete placement? BOTH OF THESE! -By ball penetration test -By slump test It depends on the workability of the concrete. If the penetration result is <= 3 inches, penetration test is applicable, if the result is more than 3", slump test is applicable As per the classification, all the chemical admixtures fall under ASTM designation _________. C494 The most common admixtures used as a retarder is _____________. Gypsum How much concrete is required to pour a volume of 15' x 30' x 1.5'? 25cu yds The KEY differences between binary and ternary mixes is ________________. Number of SCM used Explanation: The only difference between a binary and ternary mix in the number of cementitious materials, including cement, are used. Binary mix have two and ternary mix has three cementitious material. Which of the following techniques are used for measuring pulse velocity through concrete? ALL OF THESE! -Direct transmission -Indirect transmission -Surface transmission 31 | P a g e In general, how is the final setting of concrete affected by adding SCMs? It remains the same What is the non-destructive testing method(s) used in concrete? BOTH OF THESE! -Rebound Hamner test method -Pulse velocity method When concrete batching is being performed, all required water for the batch should be added ____________________. At a time (All at once) Concrete surfaces which are frequently subject to freezing and thawing, should NOT have _________________ finishing. Splattered Explanation: This finish will peel and spall. If the concrete to be poured is 150cu ft, within a mix proportion of 1:2:4, what is the quantity of the fine aggregate (sand) required? 42.85cu ft Explanation: 1:2:4 = 1 part cement, 2 part sand, 4 part coarse aggregate Which of the following is/are special types of cement? ALL OF THESE! -High Alumina Cement -Expanding cement -Acid-resistance cement The concrete which is designated by compressive strength, has strength greater than _________________ psi at 42 days. 3600 If the surface of the concrete is subject to frequent regular traffic, then is shall be given a _____________ finish. Evenly grooved (Floated) 32 | P a g e What chemical admixtures allow for a reduction in the amount of water required to produce concrete with a certain slump. Water reducing admixtures The maximum specified cover for the concrete using bundle bars, shall be ___________ inches or the equivalent diameter of the bundle, whichever is minimum. 2" What type of cement is recommended for heavy concreting like dams, bridge foundations etc., (mass concreting)? Low heat cement Explanation: Low heat cement is used to avoid excess heat creation and cracking of concrete. A concrete slab spans 15' x 12' x 4". The slab has a 3' x 3' sunlight cut out in the center. How much concrete will be required? 2 1/4cu yds Before the concrete pavement begins, which of the following needs more attention? Tie bar detailing Explanation: As reinforcement work typically differs in pavement works, tie bar detailing needs more attention than the other listed options. The KEY advantage of reinforced concrete among the following is ______________________. Can be moulded to any shape Explanation: Though all the options are correct, key advantage is that reinforced concrete can be moulded to any desired shape/size. What is/are the example(s) of the pozzolan materials used for pozzolana cement? ALL OF THESE! -Silica fume -Fly ash -Rice hull ash Which of the following factors must be considered while concreting in hot weather in order to ensure the concrete strength is protected? 35 | P a g e Apart from making concrete strong in tension, steel is added to concrete to_________. Enable moulding Explanation: Without reinforcement steel, concrete cannot be moulded to desired shape. The minimum lapping of the steel reinforcement recommended for COLUMN BARS is _______ times the bar diameter. 40 Explanation: Sometimes it can be up to 50 times of the bar dia. Which of the following preparations are to be done before the sealer application? -Protective clothing -Ventilation -First aid Explanation: Due to the high toxicity of the fumes produced when utilizing a concrete floor sealer, it is important that the area is properly ventilated. What is the required thickness of the plywood that is used for formwork? ¾ Some of the major considerations of good roadway drainage design are: -Aesthetics -Subgrade infiltration -User safety A jack system was used for concreting of a slab spanning 15 feet x 20 feet. As per the guidelines, the formwork shall be removed only after __________ days. 14 days. Explanation: Formwork of the slab with more than 14 feet span should be retained up to 14 days. Which of the following factors determine the selection of a suitable sealer? 36 | P a g e -Safety -Performance -Appearance The concrete repair works shall not be carried out if the temperature is below________ ͨ F 40 Explanation: Low temperature causes freezing and thawing. The KEY difference between the form work and falsework is ___________. Falsework is temporary Explanation: Falsework is temporary used for minor repair / short duration work. Which of the following not a component of a formwork? Rafter The factor of safety used for the formwork loads is _______. 2.0 All the concrete drainage facilities are to be designed to the velocity equivalent to __________. Self-cleansing velocity Standard sealers are generally __________. -Water based -Solvent based Explanation: Sealers are available in two variants, water based and solvent based. The specified length of the bend or loop for the reinforcement in concreting if the diameter is greater than 3/5" is _________. 7d Explanation: Where 'd' is diameter of the bar. If the bar diameter is more than 3/5" the length of the bend or loop is 7 times the bar diameter. The mechanical load transfer devices used for the concrete pavement repair is/are: 37 | P a g e -Dowel bars -Tie bars The line that assures the desirable goal of keeping the travelled way free of flooding is__________. Grade line Which of the following design parameters are to be considered while designing the drainage for highway? -Cross slope -Longitudinal slope -Height of the curb & dike Apart from the cost, which of the following shall be considered while planning for concrete formwork? -Crew efficiency -Speed of pouring -Concreting equipment used Explanation: If these are not taken care while planning the formwork, unexpected accidents may occur, like formwork collapse. According to the sealer classification, the semi-gloss sealer contain_________ percent of acrylic solids. 20-25 Lapping of all the reinforcement bars for any of the concrete elements/structure shall be_____________. Staggered Explanation: It is always recommended to have staggered lapping/splicing. Which of the following material most commonly used for sheathing? Plywood Explanation: All the above are used as sheathing material, but most commonly used is plywood. Which of the following type of sealer will provide more color enhancement to the concrete surface? 40 | P a g e Solvent sealers can be applied with an industrial, hand held pump-up sprayer equipped with a _________ gallon per minute brass spray tip. 0.5 As per the standards, minimum spacing between two reinforcing bars shall be _____________________ whichever is larger. ¾" or dia. ¼" Explanation: Its 20mm or diameter plus 6mm whichever is larger. (3/4" or d+1/4") The minimum percentage of reinforcement for concrete slab design is _________ percent. 0.12 Which of the following is NOT an advantages of timber formwork? It contains natural chemicals that helps concrete to cure faster The recommended temperature for the application of the concrete sealer is __________ ͨF 70 Explanation: This temperature will ensure the speedy and correct drying of the sealer surface, which will typically be dry enough to be touched in 1-2 hours. The type of the cement recommended for the surface repair and restoration works is________. Rapid hardening cement Which of the following preparation are required for the cast-in-place concrete? -Formwork -Shoring & reshoring -Vertical slip forms The KEY advantage of using the steel formwork among other types is _________. Gives the best finish Explanation: Steel formwork gives the good finish and such surfaces need no further treatment. The concrete used for cementitious lining for the pipes, shall have the compressive strength of ________ psi after 28 days. 6000 41 | P a g e As per Caltrans specifications, the full depth concrete repair joint must be at least __________ feet from the nearest crack or joint. 6'6" Which of the following is the most suitable form work for the circular shaped structures? Steel sheet Concrete pipes are also used for the drainage purposes where the site conditions are unfavourable for cast-in-situ drainage. The minimum diameter of the pipe specified for trunk drain storm water drainage is __________ inches. 18 Which of the following loads is/are considered for designing the formwork? -Dead load of the formwork -Concrete load -Live load of the working people