Self-compacting concrete (SCC) is a form of concrete that is capable of flowing into the congested interior of formwork and consolidating under the action of its own weight without segregation and bleeding. In the present investigation, an attempt has been made to study the effect of elevated temperature on mechanical properties of SCC specimens made with different mineral admixtures that were heated from 27 to 900°C and cooled by air or water. Silica fume, flyash, metakaolin were used as mineral admixtures. Master Glenium was used as superplasticizer, and Glenium Stream 2 was used as viscosity modifying agent. Mechanical properties of the cooled specimens such as compressive strength, tensile strength, flexural strength, and modulus of elasticity were found. Compressive, tensile, and flexural strengths of specimens were found to decrease by 73.18%, 65.05%, and 63.2%, and 85.2%, 83.52%, and 83.56% for the specimens with metakaolin that were heated and cooled by air and water, respectively. Similar reductions were found for the SCC specimens made with silica fume and flyash. Microstructure investigation has been carried out on SCC samples using scanning electron microscope and X-ray diffraction analytical techniques to understand the effect of temperature on decrease in strength.not exhibit the same level of performance as NSC under fire. Literature on this topic is scanty, and hence, an attempt has been made to understand the reduction in the strength of self-compacting concrete (SCC) made with different mineral admixtures that were exposed to higher temperature.Sivaraja [1] studied the effect of high temperature on mechanical strength properties of five different SCC mixes such as normal concrete, SCC with flyash (FA), SCC with silica fume (SF), SCC with rice husk ash, and SCC with 20% quarry sand. Mechanical properties such as compressive strength, split tensile strength, and modulus of rupture were obtained by conducting respective tests as per Indian standards. The strengths of the specimens subjected to high temperature were compared with those of unheated specimens.Neelam Pathak and Rafat Siddique [2] made an investigation on the properties of SCC such as compressive strength, splitting tensile strength, rapid chloride permeability, porosity, and mass loss when exposed to elevated temperatures. Mixes were prepared with three percentages of class F FA ranging from 30% to 50%. Test results clearly indicated that there was little improvement in compressive strength within temperature range of 200-300°C as compared with 20-200°C. A slight reduction in splitting tensile strength was found for the temperature ranging from 20 to 300°C with the increase in percentage of FA.Y. F. Chang et al.[3] carried out an investigation to obtain complete compressive stress-strain relationship for concrete after heating to temperatures of 100 to 800°C. From the results, a single equation for the complete stress-strain curves of heated concrete was developed. Through the regression analysis, the relationships of the mechanical pr...

Due to ever-increasing disposal problems of agricultural wastes in developing countries have created opportunities for use of agricultural wastes in the construction industries. An attempt has been carried out by partial replacement of cement with areca-nut shell, fine aggregate with coconut shell powder by pulverizing it into ashes and coarse aggregate with oil palm shell9. Concrete specimens were cast and cured for 28 days, a detailed comparison is made with conventional concrete and concrete with agrowaste by testing the specimens to finding the mechanical and durability properties like compressive, tensile flexural and rapid chloride penetration test. From the experimental results, it is found that the combination comprising of 10% of areca nut ash (ASA), 5% of coconut shell charcoal powder (CSCP) and 5% of oil palm shell (OPS) shows desirable results in enhancing the properties of agro waste concrete. The detailedmicrostructural investigation has been done to find the reason for enhancing the mechanical properties of concrete with agro waste by using the Scanning Electron Microscope(SEM), Energy-dispersive X-ray spectroscopy(EDAX) and X-ray diffraction(XRD) methods.Due to the presence of CSH gel and Ca(OH)2in concrete with agro waste specimens which attributes the strength and other properties.