Experimental Study On Self Healing Rubberized Polymer Concrete By Partial Replacement

Study about Self-healing concrete and its strength parameters is very important criteria in recent concrete industry. The major problem in the application of concrete is crack formation which may be structural or non-structural. These cracks reduce the durability of the concrete. This is because concrete provides a convenient way to transport liquids and gases. Therefore, maintenance and repairs are inevitable. A variety of external methods can be used to repair the crack, but the solution is expensive, time consuming, and in some cases unattractive. If cracks occur in hard-to-reach places, they must be sealed without damaging the structure. Therefore, there is a need to develop concrete that can repair cracks without external maintenance. This self-healing property can be achieved in physical, chemical, or biological ways. This paper studies the strength parameters of self-healing concrete by combining with super absorbent polymer (SAP). Because SAP (sodium polyacrylate) is a chemical polymer that can be used as a self- healing agent, concrete can repair cracks without manual maintenance. Rubberized concrete is a concrete in which the scrap tire rubber is used as a partial replacement of coarse aggregate. It has been estimated that nearly 1000 million tires reach the end of their useful lives every year which imposes a serious problem to dispose of this huge bulk of waste rubber creating a threat to environment. To protect the environment from this problem researchers are consistently exploring to use this rubber as a source to replace the natural resources such as stone aggregates which will also address the growing demand of natural construction material. In this paper, we have prepared a self healing rubberized polymer concrete by partial replacement of materials and addition of SAP, fine aggregate is replaced by copper slag (20%), coarse aggregate is replaced by rubber aggregate (15%, 25%,35%) and cement is replaced by silica fume (5%, 10%, 15%). The SAP that is being added is Sodium polyacrylate, after the mix is prepared, we have to add this polymer (0.5%, 1%). Of the sodium polyacrylates, it is used as a self-curing agent of sodium polyacrylate having the formula [-CH2-CH (COONa) -] Sodium polyacrylate consists of multiple pairs of acrylic compounds with positive and anionic charges that attract and bind water molecules, making sodium polyacrylate highly absorbent.