Analysis - Pavement Managment System - Lecture Slides, Slides of Management Fundamentals

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Analysis on Asphalt Pavement Cracks and

Some Views on the Caulking Materials

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1. Introduction

   2. The Formation Mechanism of Cracks

2. Prevention and Remedy of Cracks

3. Maintenance

Contents

6. Conclusion
7. Selection of Caulking Materials

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2. The Formation of Cracks

The Formation Mechanism of Cracks

Structural Damage Cracks (^) Temperature Fatigue Cracks

Shrinkage Cracks (^) Reflection Cracks

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3. Prevention and Remedy

1. Selections of Asphalt

   2. Selection of Asphalt Mixture

2. Design of Structural Combination Layers

3. Construction Quality

4. Measures of Strengthening Maintenance

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3. Prevention and Remedy

2. Selection of Asphalt Mixture

Enough tensile strength and bending tension at low

temperature.

In the surface, materials should possess the

performance of preventing water seepage and anti-

slide performance.

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3. Prevention and Remedy

3. Design of Structural Combination Layers

Meet requirements of traffic load.

For the surface, it also needs the abrasion resistance

and water permeability.

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3. Prevention and Remedy

5. Measures of Strengthening Maintenance

It is necessary to clean water accumulated in time.

For the severely damaged pavement, the remedial

work should be carried out timely to avoid further

deterioration.

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4 、 Maintenance on the cracks

Traditional Remedial Measures

Filling oil

patching

Easy and low-cost but asphalt may not reach the deepest point of cracks.

Emulsified

asphalt slurry

sealing

Reach the deep parts of cracks and flat

Asphalt mixture

overlay

Used in heavy traffic volume and severe pavement damage.

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4 、 Maintenance on the cracks

Field Re-maintenance

Procedures: Heat the old pavement with professional equipments till the pavement becomes melt and loose; Add appropriate amount of recycling agent, asphalt and aggregate according to a certain proportion; Pave and roll to form the good performance pavement.

Advantages: Repair cracks effectively without large-scale equipments; Save manpower and material resources.

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4 、 Maintenance on the cracks

Regeneration of large area cracks

Heat the road pavement

twice

Dig the old pavement

and mix the new

aggregate

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5. Selection of Caulking Materials

1. Traditional Thermal Pouring Materials

Advantages: Available raw materials; Economical.

Disadvantages: Heating and melting on site; Problems of aging, brittling and hardening; Scalability limitations, poor flexibility, re- cracking under the effect of temperature stress; Poor waterproof performance.

Scope: Ordinary asphalt concrete pavement and lower level cement concrete pavement.

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5. Selection of Caulking Materials

2. PVC Daub Caulking Materials

Advantages: Good resilience; Unavailable melting at high temperatures; Unavailable brittling at low temperatures.

Disadvantages: Heating and melting on site; Kerosene contamination; Decrease of resilience and deform due to the volatile characteristic; Easy to embrittle.

Scope: Ordinary asphalt concrete pavement and lower level cement concrete pavement.

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5. Selection of Caulking Materials

4. Silicone Caulking Materials

Advantages: Good heat resistance, electrical insulation, anti-aging and hydrophobic properties; Fast speed of curing; Non-foaming; Firmly bonding with the surface of the nonporous material.

Disadvantages: Poor mechanical properties and chemical resistance; Dialysis of materials in glue layers; High cost.

Scope: Due to the high cost, it can not be widely applied.

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5. Selection of Caulking Materials

1. Silicone Caulking Rubber
   2. Polyurethane Caulking Materials

Caulking Materials in Foreign counties

A silicone caulking rubber which has silicone resin as main component and maintains the liquid properties at ambient temperature and reacts with moisture in the air molded and cured by cross linking into a rubber-like solid state.

Polyurethane caulking materials have rapid developed recently by virtue of low price, good wear resistance, soft performance and adhesive ability at low temperatures.

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