Studying the compatibility between metakaolin repair materials and concrete substrate

Abstract EN

In this study, the compatibility of Metakaolin repair mortar and substrate concrete was investigated in three stages.

First : individual properties of Metakaolin as a pozzolanic material and conventional repair materials(cement mortar), and two types of concrete, such as compressive strength, split tensile strength, and flexural strength, were determined using standard ASTM test procedure.

Second : the bond strength of composite cylinder for different combinations of repair materials and substrate concrete were evaluated.

Third : the compatibility was investigated using a composite beam of repair material and substrate concrete under third point loading.

The experimental results indicated that repairing weak substrate concrete by Metakaolin modified repair material is not preferable du to disparity in mechanical properties and create high level of mismatch between them.

Furthermore, bond strength is considered as great influence factor on the success range of repair system.