EFFECT OF PARTIAL REPLACEMENT OF CEMENT WITH METAKAOLIN AND SAND WITH FOUNDRY SAND IN SELF COMPACTING CONCRETE

Abstract

One new development in concrete technology, self-compacting concrete (SCC) offers several benefits over older forms of the material. As its name suggests, self-compacting concrete doesn't need any external or internal compaction to level and consolidate; it accomplishes it all by itself. Without the need of vibration or any kind of consolidating action, SCC may spread and cover all corners of the formwork only by virtue of its own weight.Metakaolin (MK), a cementitious additive with a high reactivity, is gaining popularity in the concrete industry. MK is a kind of ultrafine pozzolana, meaning its particles are much smaller than cement particles, often measuring less than 2μm. In the casting industries, both ferrous and non-ferrous metals are cast using foundry sand, a kind of high-quality silica sand. Used or wasted foundry sand (UFS or SFS) is a byproduct of the foundry industry that may be recycled several times before becoming useless. This study showcases the research conducted to assess the hardening characteristics of SCC. The material was tested with five different weight percentages of waste foundry sand substituted for natural sand: 0%, 10%, 15%, 20%, and 25%. Cement was discovered to be 10% metakaolin. At7,14, and 28 days of age, the strength characteristics were assessed. We used a water-to-cement ratio of 0.43. We used a 1% admixture (Auramix 200) to improve the workability. Incorporating waste foundry sand as a partial replacement by natural sand up to 10% increases strength qualities, according to the results.