Concrete Mix Design
1. Know how to perform a concrete mix design on paper according to the ACI (Absolute
Volume) method. You should know the specific gravity of cement and density of water by heart.
2. What are the typical ranges of unit weights of non-air-entrained and air-entrained concretes?
Elastic Moduli of Concrete
1. Describe the meaning of the following elastic moduli and how they are determined:
(A) Secant modulus
(B) Tangent modulus
(C) Chord modulus
(D) Dynamic modulus
2. Describe how the elastic modulus is determined in the standard test for static modulus of
elasticity (ASTM C469). Which modulus was determined?
3. Describe the effects of the following factors on the elastic modulus of concrete:
(A) Moisture condition
(B) Aggregate properties
(C) Properties of hydrated cement paste
(D) Properties of transition zone
Drying Shrinkage and Creep
1. What is the main cause of drying shrinkage in concrete?
2. Describe how drying shrinkage can lead to cracking in concrete. Describe the stress that may
develop in concrete under drying shrinkage.
3. Describe the similarities between drying shrinkage and creep of concrete.
4. Know the meaning of the following terms:
(A) Basic creep
(B) Free drying shrinkage
(C) Drying creep
(D) Specific creep
(E) Creep coefficient
5. Describe the effects of the following factors on drying shrinkage and creep:
(A) Cement paste and aggregate
(B) Concrete strength
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