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| Influence of stone powder on working and mechanical properties of high-strength manufactured sand concrete |
| WANG Jianguo1, ZHOU Hailong1,2*, GE Chenglong1, CHEN Yan1 |
| 1. School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China; 2. School of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China |
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Abstract In order to explore the influence of fly ash, silica fume and different contents of stone powder on the working and mechanical properties of high-strength manufactured sand concrete, C70 manufactured sand concrete with different stone powder contents(3%, 5%, 7%, 9%, 11%)was prepared, with the help of nuclear magnetic resonance(NMR), differential thermal-thermogravimetry(TG)synchronous test and field emission scanning electron microscope test(SEM)to study its mechanical properties and microscopic evolution. The research results show that the high-strength manufactured sand concrete that meets the mechanical property requirements can be prepared by using stone powder and other qualities instead of manufactured sand. Under the condition that the water-binder ratio remains unchanged, the mechanical property of the concrete with a stone powder content of 5% to 7% is the best. The good micro-aggregate filling effect of stone powder and the formation of basic calcium carbonate make the hydration products C3S and CaCO3 micro-interface structure more compact, and Ca(OH)2 generates a large number of crystals on the surface of CaCO3, resulting in Ca(OH)2 crystal grains refinement, thereby improving the interfacial bonding effect, so that the interface transition zone is significantly improved. The research results can provide a theoretical reference for the use of stone powder in the design of high-strength manufactured sand concrete mix ratio.
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Received: 02 January 2021
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