Laboratory Study of Antistripping Agents and Accountability of Quality Aspects in Psi

Abstract

Laboratory Study Of Antistripping Agents And Accountability Of Quality Aspects In Psi

The Laboratory Study Of Antistripping Agents And Accountability Of Quality Aspects In Psi effects of air and water on the deterioration of asphalt mixtures, known as durability, continue to be a challenge. The action of water and water vapor may cause damage to moisture, including a reduction in the stiffness of the mixture and removal of the binder from the aggregate.

A reduction in cohesion leads to a reduction in strength and stiffness. The loss of adhesion is the physical separation of asphalt cement and aggregate, caused primarily by moisture. Additives have been developed to address issues of poor pavement performance and high maintenance costs experienced by moisture-susceptible pavements.

In all stripping cases, the common cause is the presence of water. The aggregate rock type has a considerable influence on the adhesion of asphalt cement due to differences in the affinity of asphalt cement. Aggregates with a high silica content (acidic aggregates, quartz rich) are more difficult to coat with asphalt cement and therefore have a higher stripping potential than aggregates with a high carbonate content (limestone or basic aggregates)

Conclusion

Laboratory Study Of Antistripping Agents And Accountability Of Quality Aspects In Psi civil project report The most important purpose of this study was to evaluate the effect of anti-stripping additives on reducing the moisture induced damage of the asphalt mixes. The following results are the summary of the conclusions regarding this purpose.

• The effect of the use of liquid anti-stripping in reducing the moisture sensitivity of asphalt mixes depends on the asphalt binder and aggregates as well as the type and percentage of the additive.
• Asphalt specimens made by limestone aggregate and Wetfix 312 have the highest resistance to moisture induced damage.
• The test conducted on multiple freeze–thaw cycles indicated that the specimens modified with anti- stripping additives have a significant higher resistance against moisture induced damage than the control specimens.