EXPERIMENTAL STUDY ON AASC USING PS BALL AS FINE AGGREGATE AT THE HIGHER CONCENTRATION OF SODIUM SILICATE

The second largest production of cement is India with 455 Million Tonnes (MT) annually, by 2020 it may reach up to 550MT. In India, the increased demand for construction industry required to meet the needs for infrastructure development. However, the production of Portland cement, releases the significant amounts of CO2to the atmosphere. Therefore, it is necessary to look for sustainable solutions for future concrete construction as next generation construction materials, by the use of the Secondary Cement Replacement Material (SCRM). The alternative replacement for Ordinary Portland Cement (OPC) can be Ground Granulated Blast Furnace Slag (GGBS), Fly-ash, Silica fume, Rice-husk ash, which are the various industrial by-products.In this present work, an attempt was made to develop Alkali Activated Slag Concrete (AASC) using Precious Slag (PS) ball as fine aggregate. The development of AASC was made with GGBS as the principal binder. Mixes were developed with binder content 443 kg/m, Na2SiO3/ NaOH ratio (1,1.5,2 and 2.5) and their performance when exposed to ambient temperature were studied. Alkali binder ratio (0.3) and Molarity of 8M was kept constant for all the AASC mixes. The test results showed that the slump values for the different mixes developed herein to be greater than 25mm with conventional slump cone satisfying the MoRTH guidelines for concrete pavements. Results showed that all AASC mixes have higher 28day compressive strength of the order 2458 MPa. The fatigue life of AASC mixes has improved by the addition of PS ball, at the higher concentration of sodium silicate, indicating better performance of AASC mixes.