Effect of varying silica-limestone sand fines on the physical-mechanical performance of concrete

Tarek Djedid,Abdelhamid Guettala,Mohammed Mani,Abdelkader Ouakouak

doi:10.3221/igf-esis.59.38

Tarek Djedid, Abdelhamid Guettala + Show 2 more

Open Access

https://doi.org/10.3221/igf-esis.59.38

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Abstract

The use of crushed limestone sand in the concrete industry will be quite possible and imperative for environmental reasons. Many researchers around the world have found that concrete based on 50% substitution of river sand by limestone sand gives better physico-mechanical characteristics. The main objective of this investigation is to search for an optimal percentage of silica-limestone fines resulting from the substitution of half in quantity of alluvial sand by crushed limestone sand in ordinary concrete. The proportions of fines that were tested in this work are 6%, 8%, 10%, 12% and 14%. The obtained results revealed that concrete based on silica-limestone sand and containing 14% of the same type of fines strongly improves the different mechanical strengths and participates in the reduction of 10% and 13%, of the coefficient of capillary absorption and of the porosity accessible to water, respectively, compared to the control concrete. In addition, good statistical relationships between the studied parameters were also found

Highlights

W orld consumption of natural sand is very excessive, due to the extensive use of concrete or mortar
Concrete based on combined silica and limestone aggregates with appropriate percentages of fines contributes to the reduction of the overall volume of capillary pores and improve the physico-mechanical characteristics, which leads to prolonging the life of structures and strongly avoiding the signs of cracking and degradation under the effect of an external aggression
In this contribution we have focused on the influence of the alternation of the percentage of silicocalcareous fines on some physical-mechanical characteristics of the above-mentioned concrete

Summary

Introduction

W orld consumption of natural sand is very excessive, due to the extensive use of concrete or mortar. From results of the fresh density of silica-limestone sand concrete (Fig. 5), an increase in density can be seen when the fines content was increased.

Results

Conclusion