Abstrato

THE EFFECT OF ADDITION OF LIMESTONE POWDER ON THE PROPERTIES OF SELF-COMPACTING CONCRETE

B. Beeralingegowda, V. D. Gundakalle

Self-compacting Concrete (SCC) is highly flowable, stable concrete that can spread readily into place and fill the formwork without any consolidation and without undergoing any significant segregation. In recent years, self-compacting concrete has gained wide application in the construction industry. The paste of SCC requires high viscosity as well as high deformability. Stability and flowability of SCC is achieved by increasing the solid fraction of paste phase of concrete i.e. increasing the cement content or employment of some mineral admixtures. However, increasing the cement content is not feasible, and may cause high cost and some other technical problems such as higher heat of hydration and higher drying shrinkage. Alternatively, pozzolanic fillers are frequently used to optimise the particle packing and flow behaviour of cementitious paste in SCC mixtures. In this study, cement content in the SCC mix is replaced with various percentages of limestone powder (LP) (0 to 30%), the fresh and hardened properties and also the durability characteristics of SCC such as acid attack and chloride attack are studied. The experimental results were validated by regression analysis. It is observed that limestone powder can be effectively used as a mineral additive in SCC