Effect of Ultrafine Cement (UFC) on the Corrosion Resistance of Cement Soil in Peat Soil Environment
Many peat soils are distributed around plateau lakes, and the reinforcement of peat soils with high organic matter content by ordinary cement cannot meet the actual engineering requirements. In order to obtain better mechanical properties and durability of the reinforcement, this experiment prepared...
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2023-08-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/16/5520 |
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| author | Yongfa Guo Jing Cao Huafeng Sun Wenyun Ding Guofeng Hua Wei Wei Siyang Huang |
| author_facet | Yongfa Guo Jing Cao Huafeng Sun Wenyun Ding Guofeng Hua Wei Wei Siyang Huang |
| author_sort | Yongfa Guo |
| collection | DOAJ |
| description | Many peat soils are distributed around plateau lakes, and the reinforcement of peat soils with high organic matter content by ordinary cement cannot meet the actual engineering requirements. In order to obtain better mechanical properties and durability of the reinforcement, this experiment prepared peat soil by mixing humic acid reagent into the alluvial clay soil with low organic matter content. The cement soil samples were prepared by adding cement and ultrafine cement (UFC) by stirring method; the samples were then soaked in fulvic acid solution to simulate the cement soil in the peat soil environment. Using the unconfined compressive strength (UCS) test, scanning electron microscope (SEM) test, and pores and cracks analysis system (PCAS) test, the effect of UFC content change on cement soil’s humic acid erosion resistance was explored, and the optimal UFC content range was sought. The results of the UCS test show that with an increase in immersion time, the strength curves of cement soil samples gradually increase to the peak strength and then decrease. Significant differences in the time correspond to the peak strength, and the overall presentation is two processes: the strength enhancement stage and the corrosion stage of the sample. The incorporation of UFC makes the cement soil in the peat soil environment exhibit excellent corrosion resistance, and the optimal UFC content is 10%. The results of the SEM and PCAS tests show that the microstructure of cement soil after immersion time exceeds 90 days, increases with an increase in immersion time, and its structural connectivity gradually weakens. The excellent characteristics of UFC particles, such as small particle size, narrow particle size distribution, fast hydration reaction rate, high hydration degree, and many hydration products, weakened the adverse effects of humic acid on the cement soil structure to a certain extent. Therefore, although the number of macropores increases, they are not connected. It still presents a relatively compact honeycomb overall structure, which correlates well with the UCS results. |
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| spelling | doaj.art-0a57eb7b99a74ecebd61b935d47752732023-11-19T01:58:43ZengMDPI AGMaterials1996-19442023-08-011616552010.3390/ma16165520Effect of Ultrafine Cement (UFC) on the Corrosion Resistance of Cement Soil in Peat Soil EnvironmentYongfa Guo0Jing Cao1Huafeng Sun2Wenyun Ding3Guofeng Hua4Wei Wei5Siyang Huang6Kunming Survey, Design and Research Institute Co., Ltd. of CREEC, Kunming 650200, ChinaFaculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, ChinaFaculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, ChinaKunming Survey, Design and Research Institute Co., Ltd. of CREEC, Kunming 650200, ChinaSichuan Xinguangjian New Materials Technology Co., Ltd., Chengdu 610000, ChinaGuangxi Zhuang Autonomous Region Testing Institute of Product Quality, Nanning 530000, ChinaFaculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, ChinaMany peat soils are distributed around plateau lakes, and the reinforcement of peat soils with high organic matter content by ordinary cement cannot meet the actual engineering requirements. In order to obtain better mechanical properties and durability of the reinforcement, this experiment prepared peat soil by mixing humic acid reagent into the alluvial clay soil with low organic matter content. The cement soil samples were prepared by adding cement and ultrafine cement (UFC) by stirring method; the samples were then soaked in fulvic acid solution to simulate the cement soil in the peat soil environment. Using the unconfined compressive strength (UCS) test, scanning electron microscope (SEM) test, and pores and cracks analysis system (PCAS) test, the effect of UFC content change on cement soil’s humic acid erosion resistance was explored, and the optimal UFC content range was sought. The results of the UCS test show that with an increase in immersion time, the strength curves of cement soil samples gradually increase to the peak strength and then decrease. Significant differences in the time correspond to the peak strength, and the overall presentation is two processes: the strength enhancement stage and the corrosion stage of the sample. The incorporation of UFC makes the cement soil in the peat soil environment exhibit excellent corrosion resistance, and the optimal UFC content is 10%. The results of the SEM and PCAS tests show that the microstructure of cement soil after immersion time exceeds 90 days, increases with an increase in immersion time, and its structural connectivity gradually weakens. The excellent characteristics of UFC particles, such as small particle size, narrow particle size distribution, fast hydration reaction rate, high hydration degree, and many hydration products, weakened the adverse effects of humic acid on the cement soil structure to a certain extent. Therefore, although the number of macropores increases, they are not connected. It still presents a relatively compact honeycomb overall structure, which correlates well with the UCS results.https://www.mdpi.com/1996-1944/16/16/5520peat soilultrafine cement (UFC)cement soildurabilitystrength testmicro test |
| spellingShingle | Yongfa Guo Jing Cao Huafeng Sun Wenyun Ding Guofeng Hua Wei Wei Siyang Huang Effect of Ultrafine Cement (UFC) on the Corrosion Resistance of Cement Soil in Peat Soil Environment Materials peat soil ultrafine cement (UFC) cement soil durability strength test micro test |
| title | Effect of Ultrafine Cement (UFC) on the Corrosion Resistance of Cement Soil in Peat Soil Environment |
| title_full | Effect of Ultrafine Cement (UFC) on the Corrosion Resistance of Cement Soil in Peat Soil Environment |
| title_fullStr | Effect of Ultrafine Cement (UFC) on the Corrosion Resistance of Cement Soil in Peat Soil Environment |
| title_full_unstemmed | Effect of Ultrafine Cement (UFC) on the Corrosion Resistance of Cement Soil in Peat Soil Environment |
| title_short | Effect of Ultrafine Cement (UFC) on the Corrosion Resistance of Cement Soil in Peat Soil Environment |
| title_sort | effect of ultrafine cement ufc on the corrosion resistance of cement soil in peat soil environment |
| topic | peat soil ultrafine cement (UFC) cement soil durability strength test micro test |
| url | https://www.mdpi.com/1996-1944/16/16/5520 |
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