تأثير استخدام الرمل النهري وبنسب مختلفة كبديل عن رمل المقالع على الخواص الميكانيكية للخرسانة .

Abstract

The search use different ratios (100% , 75% , 50% ,and 25%) of river sand as a substitute for mine sand as a fine aggregate, due to its availability, in four Concrete mixtures, while the fifth mixture was without river sand, in which sand from (Al – Akhthere) mine was used as a fine aggregate and took as a referential mixture. The seven and twenty days ages lab. tests for the above mentioned mixtures shows that the 75% partial replacement gives the highest compression, tensile, and flexure strength compared with the results of the other taken mixtures, as well as it shows approximately close results to that of the referential mixture . The same (75 %) mixture compared with referential mixture gave 96 %, 82 %, and 90 % of the compression, tensile, and flexure strength consequently.