Mechanical properties of cement-bitumen composites for semi-flexible pavement surfacing

Suhana Koting,Mohamed Rehan Karim,Hilmi Bin Mahmud,Norjidah Anjang Abdul Hamid

doi:10.3846/bjrbe.2014.24

Abstract

Semi-flexible pavement surfacing is a composite pavement that utilizes the porous pavement structure of the flexible bituminous pavement, which is grouted with an appropriate cementitious material. The main objective of this study is to investigate the mechanical properties of cement-bitumen composites as an alternative semi-flexible pavement surfacing material. This involves the selection of acceptable proportions of cementitious grouts as well as the development of cement-bitumen composites. The findings showed that by replacing 5% of the cement with silica fume (with adequate amount of superplasticizer) there is improvement in compressive strength and tensile stiffness modulus. In addition, resistance to abrasion is improved.

Highlights

Road pavement plays an important role in the development of rural and urban area
Results and discussion of experimental results The properties of cementitious grout mixtures, open-graded asphalt skeletons and cement-bitumen composites are discussed
It is found that the workability of cementitious grouts was influenced by various factors such as the water/binder ratio, dosage of SP, type of SP used, different brand of SP, different types of cement and use of supplementary cementitious material

Summary

Introduction

Road pavement plays an important role in the development of rural and urban area. It is essential as a link to new places for the purpose of trade and economic activities. The purpose of road pavement is to carry traffic safely, conveniently and economically over its design life by protecting subgrade from the effects of traffic and climate by ensuring that no materials used in the pavement suffer any unacceptable deterioration (Wright, Paquette 1979). Road pavements are generally grouped into two types as flexible and rigid pavement. The flexible pavement is defined as a pavement with a bituminous surfacing and with a base layer with or without a hydrocarbon binder in PIARC Road Dictionary of World Road Association, 2011. The rigid pavement is defined as a pavement substantially constructed of cement concrete in PIARC Road Dictionary. Flexible pavement contains aggregates bound by bituminous binders while rigid pavement comprises a variety of cement concrete types with or without reinforcements

Objectives

Results

Conclusion