Investigating the Properties of Environmentally Friendly Green Concrete (Geopolymer) Under High Temperature

Document Type : Original Research Article

Authors

1 Department of Civil Engineering, Chalous Branch, Islamic Azad University, Chalous, Iran

2 Department of Civil Engineering, Lahijan Branch, Islamic Azad University, Lahijan, Iran

Abstract

In recent decades, scientists have made extensive efforts to find an alternative material in concrete in order to stop the emission of gas CO2 in the cement production process. Geopolymers are materials with aluminosilicate properties that play the role of cement in concrete in the presence of water. Past research has proven that geopolymer concretes (GPC) do not have CO2 pollution due to the absence of cement in their mixing design, so they are environmentally and nature friendly. In this laboratory research, a mixed design of ordinary portland cement concrete (OPCC) containing Portland cement with a grade of 500 kg/m3 and a mixed design of GPC based on granulated blast furnace slag (GBFS)was made. In order to check the mechanical properties and durability, tests of compressive strength and weight loss of concrete were carried out under the temperature of 21 and 600 °C at the age of 90 days. Applying high heat to concrete samples caused a decrease in the compressive strength test results in OPCC and GPC by 42.31 and 14.9 percent, respectively, and in the weight loss test by 0.0067, respectively. And 0.0064 percent weight loss was obtained in OPCC and GPC. In the compressive strength test under 21 and 600 °C, GPC showed 11.41 and 64.35% superiority over OPCC. The results obtained from the scanning electron microscope imaging analysis of concrete were in harmony and overlapping with the results of other tests in this research.

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References

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