Influence of Local Sand on the Physicomechanical Comportment and Durability of High Performance Concrete

Nadia Tebbal,Zine El Abidine Rahmouni

doi:10.1155/2016/3897064

Abstract

This research consists of incorporating the crushed sand (CS) in the composition of a concrete and studies the effect of its gradual replacement by the sand dune (SD) on sustainability of high performance concrete (HPC) in aggressive environments. The experimental study shows that the parameters of workability of HPC are improved when the CS is partially replaced by the SD (<2/3). However, a high content of SD (>1/3) additional quantities of water is needed to meet the workability properties. The mechanical strengths decrease by adding the SD to CS, but they reach acceptable values with CS in moderate dosages. The HPC performances are significantly better than the control concrete made up with the same aggregates. The specification tests of durability show that the water absorbing coefficients by capillarity increase after adding SD to the CS.

Highlights

Current trends in the formulation of high performance concrete and low environmental impact show that the solid volume fraction is increasingly high
The difference observed between the water/cement of various types of concrete tested depends on Porosity (%) Absorption coefficient (%)
The test results show that water/cement ratio and water absorption values of crushed sand concrete mixtures decreased with the increase in level of fine aggregate replacement by crushed sand

Summary

Introduction

Current trends in the formulation of high performance concrete and low environmental impact show that the solid volume fraction is increasingly high. Increasing the volume fraction of solid presents serious effects on the workability of new concrete. The high performance concrete (HPC) is highly fluid concrete which requires high dosages of sand and fine elements compared to ordinary concrete (OC). The crushed sand (CS), with wide granularity, is a byproduct of crushing massive rocks. Sand dune (SD) is extrafine sand, characterized by a tight size distribution of the grains. Containing high content of fines, these types of sand can be interesting components of HPC [1, 2]

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Conclusion