تاثير الاضافات علي الخلطات الخرسانية

Abstract

Abstract The research dealt with studying the effect of additives on concrete mixtures, using additives (delay setting time, accelerating setting time, operability + accelerator). Laboratory tests were conducted for the materials used in the mixture (coarse aggregate, fine aggregate, cement), and a mixture was made according to the British method to give a pressure resistance of 30 N/mm2 after treatment for a period of 28 days. (7,21,28 days), and it was concluded that adding the setting time accelerator and adding (operability + accelerator) increases the resistance of the mixture, and adding the setting time delay reduced the resistance of the mixture in proportion to its removal from the casting mold before completing the hardening and drying process, and the following results were obtained ''a mixture free of additives, after 28 days the strength was 32.7N/mm , ADT after 28 days the strength was24.4N/mm, SR25 after 28 days the strength 35.6N/mm, 901 after 28 days the strength 37.4N/mm '' and discussed.