اثر استخدام الرمل السيليكي على مقاومة الخرسانة

Abstract

In this research, a study of using silica sand of a purity reaches 95% was done in order to know its effects on the strength of concrete when it used as an alternative to the normal sand by a different ratio of 25%, 50%, 75% and 100%. The study was done using Normal Portland Cement with a water/cement ratio of 0.52 and the mix design was done according to the British Standard Method. The ratio 1:1.5:3 was used for the different materials composed of the mix design. A reference mix design was used without containing any silica sand by means of 0% ratio of silica sand. Compression tests for the strength of concrete have been done for cubes of 7 days and 28 days age of curing and the results obtained appeared that the using of silica sand increases the concrete strength with reaching the peak at a ratio of 50% of silica sand where the strength was increased for the 7 days and 28 days by a ratio of 10% and 11% more than the strength of reference mix design respectively. Also, the study appears that the increase of silica sand by more than 50%, leads to the brittleness of concrete and this has been seen clearly when the ratio of silica sand reached 100% since the strength of concrete be down by 31% for 7 days and by 16% for the 28 days.