Use of Ceramic Wastes with Alkali Activated Mortar for Passive Fire Protection of Concrete

Abstract

Nowadays, global demand of OPC continuous to increases in order to demand the recent infrastructures. Concrete is hazardous to prone fire. OPC can increase CO2 emissions in the atmosphere. The addition of CaO allowed for the production of C-S-H gel when mixed with N-A-S-H gel in order to build a network for the impact of temperature. Alkali activated mortars were manufactured by Fly Ash, Ground Granulated Blast Furnace Slag (GGBFS) for passive fire protection. The Fly Ash and GGBFS were used as cementitious material. Sodium Hydroxide (NaOH) and sodium silicate (Na2SiO3) were used as alkaline activators to alkali activation of alum inosilicate source materials. Fire resistance of Alkali activated mortar comprising of ceramic waste powder in different proportions of (50, 60, 70 and 80 %) with various replacement of cementitious materials. Two types of ceramic waste powder using vitrified tile powder and wall tile powder and two different cementitious materials such as GGBFS and FA were used with the molarity of 10 M NaOH and solution to binder ratio is 0.6. Sodium silicate and sodium hydroxide ratio is 0.75 constant. The ratio of Binder to aggregate is 1. 12 mixes of each mix were developed. The mortar size of 50mm ×50mm×50mm were casted and tested for compressive strength before and after temperature exposure at 900℃. Mix which gives best compressive strength further chosen for final investigation is done by changing molarity ratio, Ratio of sodium silicate to sodium hydroxide were changed. Cubes were heated at 900℃ in muffle furnace for 1 hour. Then they were tested the compressive strength, residual compressive strength, mass loss after higher temperature exposure is evaluated. Then concrete mix design were optimized for M25 grade. 150mm ×150mm×150mm cubes were coated with geopolymer paste and tested to evaluate the interface temperature of the concrete and geopolymer surface with the help of K Type Thermocouple and after that bond strength were checked.