Strength of Concrete Using Different Types of Additives
Abstract
In this investigation, conventional concrete mixes (as a reference mixes) and concretemixes produced with (5, 10, and 20)% of cement replacement by silica fume, crushed glass and crushed nucleate additives respectively, these mixes were used in preparing (144) concrete specimens. Laboratory test results in dictated that:
a)There was a significant increase (17.6 to 88.5 and 8.8 to 25.8) % in the compressive strength of concretes produced with silica fume and crushed glass additives respectively, while a significant reduction (29.6 to 62.6)% in the compressive strength was recorded using concrete mixes with crushed nucleate.
b)there lation ships between the 7-day(fc,7)and:the28day(fc,28)compressive strength areas follows
- [fc,28 = 1.701 fc,7] for (reference mix);
- [fc,28 = (1.590 to 1.931) fc,7] for silica fume mixes;
- [fc,28 = (1.660 to 1.813) fc,7] for crushed glass mixes;
- [fc,28 = (1.521 to 1.796) fc,7] for crushed nucleate mixes.
c)percentages of increasing in both flexural and splitting tensile strengths, as compared with conventional concrete, are as follows:
- for silica fume mixes: (26.92 to 48.72 and 44.44 to 72.22)% respectively;
- for crushed glass mixes: (46.15 to 71.79 and 11.11 to 36.11)% respectively.
On the other hand, crushed nucleate mixes recorded a drop in both flexural and splitting tensile strengths (5.41 to 34.48 and 28.57 to 71.43)% respectively.
d)Finally, the research included also deriving different relationships between compressive, flexural and tensile strengths of concretes produced using silica fume and crushed glass additives.
Keywords
Silica fume, Crushed glass, Crushed nucleate, compressive strength, tensile strength, flexural strengthMetrics