Studying the Effect of Various Pozzolans in Different Percentages on the Bond Strength of Lightweight Self-compacting Concrete

Document Type : Research Paper

Authors

1 Department of civil engineering, Qazvin branch, Islamic Azad University, Qazvin, Iran

2 ِDepartment of civil engineering, Qazvin branch, Islamic azad university, Qazvin, Iran

3 civil engineering department of qazvin azad university

Abstract

One of the most suitable materials for using in construction is self-compacting concrete. This type of concrete, not only due to the lack of the need for vibration but also because of lesser weight resulting from using lightweight aggregate instead of gravel, could be a proper option to be utilized in earthquake-prone areas. Especially in cases where the existing structure, including the building, needs to be retrofitted and repaired, the presence of lightweight concrete with no need to compaction can be auspicious. Thus, in this study, 32 mix designs of self-compacting concrete were used as research. In these mix designs, the type of lightweight aggregate, both type and amount of pozzolan were changed to evaluate the effect of each one on the bond strength properties of concrete. The concretes were placed in acidic environments, and then the bond strength was assessed using push-out and splitting-prism methods. From the results, it is shown that pozzolan containing 5% of metakaolin and 10% of zeolite has the best and worst rheological properties, respectively. The rate of reduction and changes in the bond strength in sulfuric acid are lower than those of hydrochloric acid. Specimens containing scoria show higher bond strength values. Furthermore, by exposure to acidic environments, after 7 days the specimens containing scoria and after passing 28 and 60 days, the specimens containing lica experienced the least reduction of bond strength

Keywords

Concrete Research
Volume 13, Issue 3 - Serial Number 31
September 2020
Pages 93-105

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