Abstract
Alkaline dry powder activator, coal gangue, fly ash, and other raw materials are utilized to prepare coal gangue-based geopolymer concrete. The procedures of making the coal gangue-based geopolymer concrete are illustrated firstly. Also, basic mechanical properties, such as compressive strength and flexural strength of the geopolymer concrete, are studied through mechanical tests. The basic mechanical properties of ordinary concrete and coal gangue-based geopolymer concrete with different activation methods were compared and analyzed. Effects of curing temperature, curing time, water-binder ratio, and sand ratio on the basic mechanical properties of coal gangue-based geopolymer concrete activated by alkaline dry powder were studied. The optimal curing temperature, water-binder ratio, and sand ratio range of coal gangue-based geopolymer concrete activated by alkaline dry powder are obtained, respectively.
Highlights
“Let’s get this on the table right away, without mincing words
Kusbiantoro et al [17] mixed fly ash and husk ash as raw materials for geopolymer concrete and studied the strength test from three different hardening times, external curing temperature, external corrosion environment, and oven curing. e results showed that high temperature increased the decomposition of silica and alumina produced by the polarization of hydrogen and oxygen molecules in fly ash
When they were used in concrete, those vibrations reached a very high level, indicating that these ash powders had a positive impact on geopolymer. e results show that the scope and degree of geological polymerization reaction are higher when fly ash is compared with bottom ash
Summary
“Let’s get this on the table right away, without mincing words. With regard to the climate crisis, yes, it’s time to panic” [1]. E emergence of geopolymer prepared from coal gangue waste, a new environmental production material, undoubtedly provides a value-added method for such industrial while overcoming the shortcomings of traditional concrete such as high energy consumption and heavy pollution, opening up new prospects and directions. Kusbiantoro et al [17] mixed fly ash and husk ash (referred to as RHA) as raw materials for geopolymer concrete and studied the strength test from three different hardening times, external curing temperature, external corrosion environment, and oven curing. Hardjito et al [20] studied the fly ash-based polymer concrete (GPC), compressive strength range between 30 and 80 MPa, and the slump changes from 100 to 250 mm (activator strength: 8–14 M). Ordinary cement concrete is used as the reference standard to make the coal ganguebased geopolymer concrete with the same compressive strength grade. e experimental design is carried out to study the mechanical properties. e making procedures are illustrated and the mechanical properties are studied
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