Constraints in Using Manufactured Sands in Concrete Pavements in Australia

Abstract

Due to the shortages of natural sands along the east coast of Australia in particular and the need to fully utilise fines produced in quarry operations, progress has been made in utilising blends of manufactured sands and natural sands in concrete pavements. This paper documents some of the constraints in utilising larger proportions of manufactured sands in concrete pavements. These constraints are mainly caused by the current level of knowledge regarding the impact of manufactured sands on skid and abrasion resistance of concrete pavements. This paper presents a brief review of literature on this subject in the USA, France and UK. It also briefly documents work recently carried out in Australia by CCAA (Cement Concrete and Aggregates Australia), referring to the skid and abrasion resistance of concrete pavements using manufactured sands. The paper concludes that there is no relationship between the free silica content and the skid resistance. With regard to the abrasion resistance, it is rather the curing conditions and the compressive strength that are more important in achieving good results.

Evaluation of fine aggregates from the Budhi Gandaki-Narayani River, central Nepal for mortar and concrete

“…Galloway (1994) classified the surface texture of aggregate as glassy, smooth, granular, rough, crystalline, and honeycombed. For the best workability, a smooth surface is most desirable, however, for the best bond between aggregate and cement paste, and also for optimum strength, the rough-textured particles are preferred (CCAA, 2007;CCAA, 2008;Dumitru et al, 2015). Therefore, study of physical and textural properties of fine aggregates are very important to evaluate their usefulness in various constructional activities.…”