Combined Effect of Thermal Stimulated Superplasticizer with BFS on Fresh and Hardened Property of Mortar

Abstract

Usage of mineral and chemical admixtures in concrete or mortar is a usual solution to reach full compaction mainly where reinforcement blockage and the shortage of skilled labors happen. Super Plasticizers have become essential ingredients of any designed concrete mix today. Property of fresh and hardened concrete is strongly influenced by the interaction of mineral and chemical admixtures. This paper has been made to evaluate effect of heat stimulation of with two types of Polycarboxylic acid-based ether superplasticizer, pre-cast (SP2) type and ready-mix (SP1) type superplasticizer (SP) with normal Portland cement (OPC), high early strength cement (HESPC) and partially replacement of blast furnace slag (BFS) with cement 0%, 30%, 45%, and 60%. Investigated the fresh and hardened property of mortar. The superplasticizer (SP) was heated in a thermostatic chamber 70°C for 24 hours, the result shows that the heat stimulation of SP increased the fluidity, air content and flow loss, and decrease the density and compressive strength of mortar. Consequently, unitized the flow for heated and non-heated SP, and evaluate them. The air-content, density, and compressive strength were same. Besides, the flow loss was affected by many factors type of cement type of SP and heat stimulation technique of SP amount of BFS. By heat stimulation technique and increasing the amount of BFS caused to decrease the flow loss. The SP1 improve the fluidity and flow loss of mortar than SP2 in all conditions. Heat stimulation technique of SP with HESPC cement doesn’t change the fresh property of mortar. The compressive strength of HESPC was increased than OPC cement. Furthermore, by increasing the amount of BFS increased the fluidity and decreased the compressive strength and effect of heating on fluidity. The water-cement ratio was 30% and sand cement ratio was 2:1. Blast furnace slag (BFS) cause to improve the fluidity of mortar. However, by increasing the amount of BFS the compressive strength and effect of heat stimulation and flow loss was decreased.