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| Study on the Mechanical Properties of Steel Slag Cement Solidified Silt Soil and the Law of Chloride Ion Transport under Different Erosion Times |
| WU Yan-kai1,2, GUO Xiao-yang1, MA Yan-hui1, MIAO Sheng-yao1 |
1. College of Civil Engineering and Architecture, Shandong University of Science and Technology, Shandong Qingdao 266590, China;
2. Shandong Provincial Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering, Shandong Qingdao 266590, China |
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Abstract In order to study the influence of Chloride Erosion on the mechanical properties of steel slag cement solidified silt soil and the law of chloride ion migration, indoor tests were carried out on the physical and mechanical properties and microstructure of steel slag cement solidified silt soil under Chloride Erosion, through unconfined compressive strength test, chloride ion concentration measurement test The macroscopic physical and mechanical properties, microstructure changes and internal chloride ion migration of solidified soil eroded by chlorine salt and solidified by steel slag cement under different conditions were studied by SEM test. The test results show that with the increase of erosion time, the mass change rate of steel slag cement soil sample is significantly higher than that of cement soil under the erosion of chlorine salt. The maximum mass change rate is 1.78 times of that of cement soil, and the maximum difference of water content can reach 9.17% and 8.54%; With the increase of erosion time, the unconfined compressive strength of specimens cured for 7 days showed an overall growth trend, and the broken line of unconfined compressive strength of specimens cured for 28 days showed the form of first increasing and then decreasing. The unconfined compressive strength of cement soil sample is significantly higher than that of steel slag cement soil, and its maximum strength is 2.34 times that of steel slag cement soil; With the increase of erosion time, the internal chloride ion concentration first increases and then tends to be stable. The chloride ion corrosion resistance of cement soil sample is better than that of steel slag cement soil sample. Compared with the maximum chloride ion concentration, steel slag cement soil sample is 1.52 times higher than that of cement soil. Microscopically, SEM test results show that with the increase of chloride erosion time, the internal structure arrangement of cement soil samples becomes relatively loose, which can seriously damage the internal structure of samples and reduce their bearing capacity.
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Received: 28 September 2021
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| Fund:Supported by the Natural Science Foundation of Shandong Province of China（No. ZR2022MD061） |
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2023, Vol. 17 
