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| Experimental study on mechanical properties of red Pisha-Sandstone Cement Soil under wetting-drying cycles |
| WU Shangyun, LI Xiaoli*, CHANG Ping, ZHANG Ying, GUO Luomin |
| College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Morgolia 010018, China |
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Abstract In order to solve the problem of breaking loose and reducing strength of Pisha-sandstone in case of water, through simple processing, to achieve the effective use of the Pisha-sandstone, reduce the cost of governance, by adding different amounts of silicate cement form red Pisha-Sandstone and name Pisha-Sandstone Cement Soil,experiment on wetting-drying cycle, and unconfined compressive strength, and microstructure observation of hyperdepth at different ages of Pisha-Sandstone Cement Soil was made.The results show that: only 5% dosage Pisha-Sandstone Cement Soil can effectively improve the Pisha-sandstone water collapsibility. The 5times wetting-drying cycle Pisha-Sandstone Cement Soil reaches the maximum compressive strength, then it tends to be gentle. The wetting-drying cycle has damaging effects on non-cement Pisha-sandstone. It provides effective curing for Pisha-Sandstone Cement Soil. Whether at early strength or at late strength,the compressive strength of 5% is the lowest and then gradually increased. The strength of 20% and above is almost equal and maximum. It can be seen that the optimum cement content is 20%. By observing the microstructure, feldsparthic Pisha-Sandstone Cement Soil, with the increase of age, and small admixture has uneven surface fluctuation, and holes. The feldsparthic Pisha-Sandstone Cement Soil structure of the aptimas dosage of 20% is wholly close,smooth, with surface,less holes,better compactness,and the compressive strength can reach the strength requirement of bricks and blocks.
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Received: 15 June 2018
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