Effects of loading rate on flexural-tension properties and uniaxial compressive strength of micro-surfacing mixture

Abstract

The major objective of this research was to discuss the effects of loading rate on the flexural-tension properties and uniaxial compressive strength of micro-surfacing mixture using three-point bending test and uniaxial compressive test respectively. As a preventive maintenance surface treatment on asphalt pavement, micro-surfacing was formed on the basis of the ISSA recommendation of an optimum micro-surfacing design. Tests were conducted over a wide range of temperature to investigate the difference of properties from low loading rate to a relatively high loading rate. Three-point bending test was used to study the flexural strength, strain and modulus of micro- surfacing mixture, and uniaxial compressive test was carried out to obtain the relationship between strength and the loading rate as well as temperature. The experimental results showed that flexural strength at high loading rate was larger than that at low loading rate. The flexural strength difference between low and high loading rate enlarged when the temperature rose. The flexural strain at high loading rate increased compared with results of the low loading rate. Results of the flexural modulus revealed that micro-surfacing mixture exhibited better anti-cracking characteristic at low temperature when given a relatively low loading rate. Results of uniaxial compressive test revealed that the strength difference of micro-surfacing among different loading rates increased with the increase of temperature. The logarithm relationship between the strength and loading rate over a wide range of temperature was obtained to compare the experimental and predicted values, which resulting in a reasonable consistency.

Keywords

loading rate / flexural-tension properties / uniaxial compressive strength / micro-surfacing

References

[1] Recommended Performance Guidelines for Micro-Surfacing[M]. International Slurry Surfacing Association (ISSA), A143 (revised), May 2005

[2] K Chatti, et al. Final Report, LTPP Data Analysis: Influence of Design and Construction Features on the Response and Performance of New Flexible and Rigid Pavements[R]. NCHRP Project 20-50(10/16), National Cooperative Highway Research Program, Washington DC

[3] Ministry of Communications of P R China. Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering[S], 2000 Beijing People’s Communication Press

[4] Deng Xuejun, et al. Principle and Design Methods of Pavements[M]. Beijing: China Communication Press