Effect of calcium chloride on strength of concrete at low temperatures

Abstract

-Waste has been increased day by day due fast-growing population. Waste cloud is reduced if it is incorporated in concrete production. Among these wastes, rubber tire waste has the creditability to be used in concrete. However, researchers show that concrete made with rubber tires has low mechanical and durability performance of concrete. Therefore, it is essential to add pozzolanic material into rubberized concrete to enhance its mechanical performance. In this research waste glass was being used as a pozzolanic material in the proportion of 10–30% in increment of 10% by weight of cement while 20% rubber tires as coarse aggregate kept constant. Isothermal conductivity, thermogravimetry (DTG), and X-ray diffraction (XRD) were conducted to study microstructure analysis of concrete. Fresh properties were evaluated through slump cone test while mechanical performance was evaluated through compressive and split tensile strength. Water absorption, dry shrinkage, and acid resistance tests were performed to assess the durability aspects of rubberized concrete. Results indicated that waste glass can be successfully used to enhance the mechanical performance of rubberized concrete up to 20% substitution. Compressive and split tensile strength was 24% and 30% more than reference concrete at 20% substitution of waste glass respectively. Furthermore, it also indicates that durability aspects such as water absorption, dry shrinkage and acid resistance was considerably improved with the substation of waste glass. However, at higher dose of waste glass (30%), decreased in mechanical and durability performance was observed due to lack of workability. The overall study demonstrates that waste glass up to 20% can be safely used as a binding material in rubberized concrete without negative effects on mechanical and durability performance of concrete.