Assessment of the modulus of elasticity in concrete with high reactivity metakaolin from industry

ABSTRACT

The mineral additives are employed in the concrete in order to improve some of its mechanical properties as well as its durability Currently, there has been increasingly adopted the use of highly reactive pozzolans as a tool for obtaining high-strength concrete (HSC). The high reactivity metakaolin (HRM) comes from the calcination process at temperatures between 400 ° C and 950 ° C and subsequent grinding process clays kaolinite with high yields, as the kaolinitic clay and kaolin. This paper aims at assessing the use of HRMK within the concrete and verifying its influence within the modulus of concrete elasticity. To obtain this mineral addition a paper industry tailing was adopted as raw material, which was then calcinated and processed in a mill to be transformed into HRMK. To accomplish this work, the content of the HRMK replacements has been varied, as well as the water/concrete ratio and the ages of disruption of the body-test. The methodology used has been based on laboratorial assays and statistical tools in order to validate the outcomes. The study concludes that the isolated effect of the controlled variables and some interactions between these variables influenced the concrete's elasticity.

Keywords:
mineral; high reactivity metakaolin; elasticity modulus