Early Age Performance of Binary Fly Ash Portland Cement Blends

2014-04-28
During the manufacturing of portland cement (PC), massive amounts of raw material and energy are consumed. Besides depletion of natural resources, the CO2 – a major contributor to the greenhouse effect and the global warming - emissions from PC manufacturing (~6% of the global CO2 emissions) is alarming. Supplementary cementititous materials (SCM) can be effectively used to partially replace PC in production of blended cements. These alternative cements are more sustainable when compared to ordinary PC with reduced raw material and energy demand and minimized CO2 emissions. Fly ash (FA) - a fine and highly amorphous aluminosilicate rich material - is the most important waste product of thermal power plants. FA is generated during the combustion of pulverized coal and collected from the power plant chimneys by electrostatic filters. The global production of FA is estimated to be 750 million tonnes annually whereas the global average of FA recycling is estimated to be about 25%. Cement and concrete industry is the leading construction industry in FA utilization. The wide range availably and pozzolanic potential of FA makes it one of the most common SCMs. In this work, two FA samples were blended with PC at two different FA-to-PC weight ratios: 20:80, and 60:40. A 0:100 control sample was also tested. The blended cements were mixed with water to initiate the hydration reactions. An isothermal calorimetry was used for the determination of the rate of hydration heat liberation of each blend for the first 7 days of hydration reactions. The flow diameter of the blended cement mortar were determined according to ASTM C 1437. Flexural and compressive strength tests on mortars were conducted on 2-day, 7-day and 28-day old samples. As increasing FA content, heat of hydration and also strength development decreased for early-age of blends.
Eurasia 2014 Waste Management Symposium, at İstanbul (28 - 30 Nisan 2014)

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Citation Formats
M. Tangüler Bayramtan and Ç. Akgül, “Early Age Performance of Binary Fly Ash Portland Cement Blends,” İstanbul, Türkiye, 2014, p. 1, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/84561.