AN EXPERIMENTAL STUDY ON DURABILITY OF GEOPOLYMER CONCRETE BY REPLACEMENT OF SAND WITH M-SAND

Abstract

Concrete is the most common material for construction all over the world. The demand for concrete as a construction material leads to the increase of demand for Portland cement. Geo-polymer is an eco-friendly binding material alternative to ordinary Portland cement. Geo-polymer concrete is obtained by mixing the ingredients such as sodium hydroxide solution, sodium silicate solution (NaOH and Na2SiO3),or potassium hydroxide, potassium silicate solutions (KOH and K2Sio3)fly ash, grounded granulated blast furnace slag(GGBS) and, fine aggregate and coarse aggregate and cured suitably. The blend of sodium hydroxide solution and sodium silicate solution is termed as alkaline liquid. This study presents an investigation deals with Geo-polymer concrete by replacing of fine aggregate material witch using the M-Sand. Complete 100% replacement of natural sand witch M-Sand and compare the results witch GPC natural sand and GPC witch M-Sand and its durability. When exposed to sulphate, and acidic environment and comparison were made with normal Ordinary Portland Cement (OPC) concrete. In total four tests were conducted to determine acid and sulphate resistance of geo polymer concrete witch M-Sand. The tests involved immersion for a period of 30 to 60 days into 5% solution of sodium sulphate, 5% solution of magnesium sulphate, 5% solution of sulphuric acid and 5% solution of phosphoric acid. The evolution of weight loss and compressive strength loss were studied. The most significant degradation of compressive strength and weight were determined in 5% of acid solution. The least strengths variation and weight loss were found in the 5% of sulphate solution. The OPC concrete more deteriorated in acid as well as in sulphate solution in compared with geo-polymer concrete, thus geo-polymer concrete is more durable than the OPC concrete.