PERFORMANCE OF PLAIN, FLYASH AND GGBFS BASED MORTAR IN PLAIN AND BOILING WATER CURING

Abstract

Fly ash and Ground Granulated Blast Furnace Slag are the waste obtained from industries and our concern to our surroundings. They have a negative impact on the environment and our daily life. Fly ash is obtained from thermal power plants and GGBFS is obtained from iron industries. As the industrialisation is increasing so rapidly world-wide and with increase in production waste generation is also increasing. And the problem rises with their dumping . The utilisation of Fly ash and GGBFS in concrete as partial replacement of cement is seeking importance day by day. With some mechanical improvements in thermal power plant and iron industries operations as well as collection systems of fly ash and GGBFS has proved to enhance the quality of fly ash and GGBFS. To study the use of fly ash in mortar cement is replaced partially by fly ash and GGBFS with different percentages. In this experimental work mortar mix is prepared with replacement of fly ash and GGBFS by different compositions. Effect of fly ash and GGBFS on workability, setting time, compressive strength and water content are studied. To study the impact of partial replacement of cement by fly ash and GGBFS on the properties of mortar, experiments were conducted on mortar mixes. The strength of mortar in construction works is determined at its 28 days Compressive strength. To find this Compressive strength, usually 28 days of moist curing is required. The 28 days of waiting time is too long a period for any corrective measure in case the strength is not desirable. That is after 28 days, by the time the quality of mortar is not found as required, the mortar would have hardened significantly and might be buried by subsequent construction. This makes the replacement of mortar mass of bad-quality very difficult, costly and time consuming. Suppose if the mortar of greater strength than required, the uneconomical mix is just a waste. These indicate a necessity for finding the 28 days characteristic strength for real good quality control. Hence, for better quality control, a rapid curing procedure is needed which facilitates identifying the 28 days strength in a day or so while the real mortar is still accessible and sufficiently soft to make its removal practicable. Hence, accelerated curing techniques are becoming important In this project, Hot Water Curing Technique by which mortar will harden within a few hours and is expected to attain almost the same strength as a result which, it would have attained in 28 days by normal Curing Techniques. x Here, several tests like Compressive Strength Test, X-RAY Diffraction Test etc. on cubes of different mix will be performed and then the results of both the methods will be compared.