دراسة تحليلية مقارنة بين تصميم الخلطات الخرسانية بالطريقتين البريطانية و الأمريكية

Abstract

The main aim of this research is to make a comparison between the test results of compressive strength for concrete mixes which are designed according to British Standards which represented in concrete cubes have the dimensions of (150*150)mm, with those which are designed according to American Standards and represented in concrete cylinders which have the dimensions of (150*300)mm.Three levels are taken for the required compressive strength of concrete (ƒc̑) as follows (15,30,45) N/mm2 , laboratory tests are carried for three different ages as follows (7,28,90) day .The average compressive strength obtained is (16.3,31.9,46.3) , (15.6,30.4, 46.2) and (15.8,30.1,45.2) N/mm2 in the age of (28)day for maximum size of coarse aggregate (10,20,40) mm for the three levels of required compressive strength (15,30,45) N/mm2 respectively for that designed according to British Standards .The average compressive strength obtained is (21.2,35.6,56.4) , (18.2,32.8, 49.8) and (16.5,30.9,45.8) N/mm2 in the age of (28)day for maximum size of coarse aggregate (10,20,40) mm for the three levels of required compressive strength (15,30,45) N/mm2 respectively for that designed according to American Standards.