The current prediction equation of bond strength suggested by the design specification does not consider this decreased bond strength by the use of the recycled coarse aggregate. The recycled coarse aggregate concrete showed about 18% decreased bond strength as compared to the natural coarse aggregate concrete. The high workability is one of the crucial properties for SCC and can be controlled by appropriate dosage of super plasticizer. SCC can also be known as Super-Workable Concrete. Self Compacting Concrete (SCC) can be defined as a concrete that is able to flow under its own weight and completely fill the formwork, even in the presence of dense reinforcement without any compaction, while maintaining the homogeneity of the concrete. KEYWORDS: Geo-polymers concrete, ordinary Portland cement (O.P.C), sodium hydroxide (Na OH) and sodium silicate (Na2O, SiO2), compressive strength, flexural strength. When concrete cubes of M15, M20 and M25 was compared to geopolymer concrete cubes of 12M, 14M and 16M it was seen that the compressive strength of geopolymer concrete is increasing by 34.43,10.24 and 10.12 percentage in 28 days. The result is show that the geopolymer concrete is again high compressive and flexural strength as comparing with the ordinary Portland cement concrete. Trial mixes were done and noted the properties of Geopolymer concrete in hardened state such as compressive strength and flexural strength. Test experiments proved as fly ash based Geo-polymer concrete has excellent compressive strength and flexural strength. One tone of fly ash can be utilized for manufacturing about 2.5 cubic meter of high quality Geo-polymer concrete. In geo-polymer concrete cement is replaced by fly ash and alkaline solutions such as sodium hydroxide (Na OH) and sodium silicate (Na2O, SiO2) to make the binder necessary to manufacture the concrete. One of the efforts to produce more environmentally friendly concrete is to reduce the use of ordinary Portland cement (O.P.C) by replacing the cement in concrete with geo-polymers. The main effect of increase is temperature that melts the glaciers and increases the water level. Due to increase in uses the environment of earth is affected. In recent years the use of concrete has increased day by day due to various advantages such as good strength, long life, low maintenance etc. The tests were conducted for 7days and 28days of curing. Compressive test, splitting test, flexural test will be conducted on the prepared cubes, cylinders &prisms. In this project, our study is mainly confined to evaluation of changes in compressive, splitting tensile and flexural strength test in four different mixes of M25 Grade namely i) Normal Concrete, ii) Concrete made by 10% replacement of cement by GGBS and Silica Fume iii) Concrete made by 15% replacement of cement by GGBS and Silica Fume iv) Concrete made by 20% replacement of cement by GGBS and Silica Fume. The different cementitious materials like Ground Granulated Blast Furnace Slag (GGBS), Silica Fume, are some of the cementitious materials which can be used in concrete as cement. The main benefits of this are their ability to replace certain amount of cement and still able to display cementitious property, thus reducing the cost of using Portland cement and increasing concrete properties. Nowadays, most concrete mixture contains different cementitious material which forms part of the cementitious component. Engineers are continually pushing the limits to improve its performance with the help of innovative mineral admixture. Concrete is a most versatile construction material because it can be designed to withstand the hardest environment while taking on the most inspirational forms.
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