Assessment on slag based geopolymer concrete blended with industrial waste using different ratios of alkaline liquid to binder and NaOH/Na2SiO3

<p class="MsoBodyText" style="margin-left:9px;margin-right:21px;text-align:justify;"><span style="font-family:Calibri,sans-serif;font-size:10pt;">At recent days, the rapid rate of increase in population and industrial growth generates enormous volume of waste products that creates environmental and health hazards. The</span><span style="font-family:Calibri,sans-serif;font-size:10pt;letter-spacing:.05pt;"> production of </span><span style="font-family:Calibri,sans-serif;font-size:10pt;">cement is one of the</span><span style="font-family:Calibri,sans-serif;font-size:10pt;letter-spacing:.05pt;"> key factors in liberation of CO<sub>2</sub> gases in atmosphere</span><span style="font-family:Calibri,sans-serif;font-size:10pt;">. The</span><span style="font-family:Calibri,sans-serif;font-size:10pt;letter-spacing:.05pt;"> utilization of </span><span style="font-family:Calibri,sans-serif;font-size:10pt;">waste products not only eliminate the disposal problems</span><span style="font-family:Calibri,sans-serif;font-size:10pt;letter-spacing:.05pt;"> but also </span><span style="font-family:Calibri,sans-serif;font-size:10pt;">reduces the emission of greenhouse gases to the atmosphere. This is one of the main reasons in developing slag based geopolymer concrete which leads to development of ecofriendly environment. This paper</span><span style="font-family:Calibri,sans-serif;font-size:10pt;letter-spacing:.05pt;"> dealt with </span><span style="font-family:Calibri,sans-serif;font-size:10pt;">the suitability of Geopolymer Concrete</span><span style="font-family:Calibri,sans-serif;font-size:10pt;letter-spacing:.05pt;"> by curing under </span><span style="font-family:Calibri,sans-serif;font-size:10pt;">ambient temperature for its adaptability in construction industry and the effect of different alkaline liquid to binder ratio such as 0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0,1.1, and1.2. And with different NaOH/Na<sub>2</sub>SiO<sub>3</sub> ratios as 2,2.25 and 2.5. Experimental results were compared with various regression equations to calculate split tensile strength and flexural strength results. Four regression equations like ACI, Ahmed, Gardner and Carino were used for split tensile calculations and ACI, Australian, IS standard equations were used for flexural strength calculations. Normally, the increase in molarity is directly proportional to the compressive strength. The regression coefficient R<sup>2</sup> obtained using ACI Standard </span><span style="font-family:Calibri,sans-serif;font-size:10.0pt;tab-stops:32.45pt;" lang="EN-US">was 0.98 to 0.99. In regression analysis, the linear equation based on ACI Standard depicts almost similar values of experimental test results for both split tensile and flexural strength.The coefficient (R<sup>2</sup>) value was diverging from 0.9908 to 0.9997. Slag based Geopolymer Concrete attains the target strength of M<sub>30</sub> with alkaline to binder ratio from 0.3 to 0.9. And with ratio NaOH/Na<sub>2</sub>SiO<sub>3</sub> 2, and 2.25. Thus, addition of 30% slag with flyash and replacing quarry rock dust for river sand and replacing 30% of recycled coarse aggregate with normal aggregate increases the strength of concrete.</span></p>