Research on Durability of Concrete With Rock-Derived Micro-Fine Particles in Sand

Abstract

Since natural sand for concrete is running short globally, due to the increasing influence of environment protection legislation, and because accessible reserves are dwindling, we are obliged to improve the quality of manufactured sand, and use it in greater quantities as a substitute for the natural product. However, producing well-shaped and properly graded sand also generates micro-fine particles as an inevitable byproduct. In this study, the specific size range which has the greatest detrimental effect to concrete has been successfully discovered, and hence a method of using micro-fines most effectively can be proposed.

Constraints in Using Manufactured Sands in Concrete Pavements in Australia

“…It is important to note that, recently, the Transport Authority in New South Wales has made major changes in the specification for concrete pavement, allowing unlimited amount of manufactured sand, In Japan, a study was carried out on durability of micro fines [15], aiming at the effective use of dry micro fines when producing well-shaped manufactured sand using a dry process. The study has concluded that the exclusion of particles less than 40 μm will prevent the increase of water demand in concrete mixes, and three durability tests (accelerated neutralisation, water permeability and freeze-thaw)…”