Materials Reports  2021, Vol. 35 Issue (z2): 268-274 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Study on Strength Characteristics and Micro Mechanism of Saline Soil Solidified by Recycled Fine Powder of Waste Concrete |
| WANG Yiming, CHANG Lijun, LI Ying
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| School of Civil Engineering, Qinghai University, Xining 810016, China |
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Abstract Recycled fine powder can be used to solidify saline soil due to its low cost and easy access characteristics, which can achieve the purpose of solid waste utilization and resource conservation. Based on unconfined compressive strength test, XRD and SEM test, this paper explores the strength characteristics, micro mechanism and solidification mechanism of saline soil solidified by recycled fine powder combined with fly ash and cement. The results show that the compressive strength of solidified soil is significantly higher than that of natural saline soil, and the better substitution amount of recycled fine powder for fly ash is 80%.The addition of recycled fine powder promotes the silicification reaction of fly ash, generates hydrated calcium silicate and hydrated calcium aluminate with cementation, forms a network structure with each other, and improves the stability of soil. When the recycled fine powder combined with cement solidified saline soil, the C-S-H and C-A-H gel with strong cementation ability will be filled with the recycled fine powder in the soil pores, which will make the soil structure more dense and increase the compressive strength of the saline soil through the hardening action of the gel.
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Published: 09 December 2021
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| Fund:This work was financially supported by the Key Laboratory of Rock Mechanics and Dam Engineering, Ministry of Education Open Research Fund Project(2019005) and National Natural Science Foundation of China(51668052). |
About author:: Yiming Wang, graduated from Dalian Minzu University in June 2019 with a bachelor's degree in engineering. Now he is a postgraduate of the School of Civil Engineering of Qinghai University. The main research direction is geotechnical and underground engineering.
Lijun Chang graduated from Qinghai University in July 2002. She is currently an associate professor in Qinghai University and participates in the School of Civil Engineering. She is mainly engaged in research on enginee-ring mechanical properties of loess and saline soil. She has published more than 10 journal papers. |
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