Influence of pozzolanic materials by ternary blend systems on strength and chloride resistance of concrete

Abstract

This objective research to study the possibility of used pozzolan material in the ternary blend by fly ash, metakaolin and silica powder by replacement cement partially on the strength and resistance to chloride migration. Consideration of concrete with compressive strength in the range of 240-350 kg per sq. cm by varying the ratio of water/binder (w/b) there are three values are 0.4, 0.45 and 0.50, and variable amounts of replacement cement some. The ternary blend of the fly ash, metakaolin and silica powder of percentage of 0, 2.5, 5, 10, 15, 20 and 25 by weight of cement. and the control specimens (w/b) without contain fly ash, kaolin and silica powder, the slump test in the range of 3-5 cm, and the use superplasticizer to control the slump test of concrete. By casting specimens of cylindrical diameter 10x20 cm cube 10x10x10 cm and the beam size 10x10x35 cm, after curing 28 days, and test compressive, tensile and flexural strength of concrete, all specimens each ingredient by Chloride Migration Test method and the results showed that concrete is a mixture with pozzolan, such as silica powder, metakaolin and fly ash, with amount increase replacement. The increase will help improve the quality of the concrete physical properties. The increased of compressive and Tension strength as the percentage increase, especially to replacement cement increased by fly ash, metakaolin and silica powder reduces the penetration of chloride in concrete respectively, As a result of the porosity of the concrete with lower amounts of tightness concrete has increased