تأثير استخدام مادة الميتاكؤولين على خواص الخرسانة

الملخص EN

This research aims to study the effect of using on properties of hardening concrete.

This work involves seven concrete mixtures of ( 1 :1.5 :3 ) and water cement ratio is (0.50 ) by adding and replacement metacaolin material of ( 10 ,25 ,50) % by weight of cement .

Compressive strength is tested of referenced concrete mixture.

Adding and replacement metacaolin for concrete mixture , where Compressive strength for six samples are (27, 25 ,30 ,23 , 22 , 20 , 15 ) , ( 38 , 43 , 48 , 32 , 33 , 29 ,23 ) and (42 ,54 ,57 , 40 , 38 , 32 , 18 ) N / mm 2 for ages ( 7 ,28 90) days respectively .Increasing of compressive strength of concrete adding metacaolin with ( 10, 25 ) % by weight of cement, and decreasing of compressive strength of concrete adding metacaolin with (50%) by weight of cement, while replacement metacaolin concrete mixture of (10, 25, 50 ) % by weight of cement occurs decreasing of compressive strength of concrete at all ages of ( 7,28,90 ) days .

Also, average splitting tensile strength are tested for three samples ( 5.3 ,5.6, 5.9 , 4.2,5.0,4.7,3.68 ) , ( 5.8 ,6.1 , 6.5 ,4.6 ,5.4 ,5.1 ,4.1 ) and ( 6.4 ,6.7 ,7.2 ,4.9 ,5.8 ,5.4 ,4.3 ) N /mm 2 for ages of ( 28 ,56 ,90 ) days respectively.

Adding metacaolin for concrete mixture of (10,25 )% by weight of cement improves the compressive strength of concrete comparing with referenced concrete mixture opposite of replacement metacaolin for concrete mixture where has negative effecting of compressive strength of concrete for all their ages .

Also average splitting tensile strength are has the same condition.