Effect of Ultra-Fine Cement on the Strength and Microstructure of Humic Acid Containing Cemented Soil

Jing Cao, Fangyi Liu (), Zhigang Song, Wenyun Ding, Yongfa Guo, Jianyun Li and Guoshou Liu
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Jing Cao: Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China
Fangyi Liu: Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China
Zhigang Song: Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China
Wenyun Ding: Kunming Survey, Design and Research Institute Co., Ltd. of CREEC, Kunming 650200, China
Yongfa Guo: Kunming Survey, Design and Research Institute Co., Ltd. of CREEC, Kunming 650200, China
Jianyun Li: Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China
Guoshou Liu: Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China

Sustainability, 2023, vol. 15, issue 7, 1-16

Abstract: The peat soil in the Dianchi Lake area of Yunnan, China, is widely distributed, bringing many problems to engineering. The peat soil foundation is usually treated by the cement mixing method, and the reinforcement effect of cemented soil is mainly affected by humic acid (HA). Ultra-fine cement (UFC) can improve cement performance and reduce cement consumption, decreasing CO 2 emissions and the impact of human activities on the environment. Simulated peat soils in different environments are prepared with HA reagent and cohesive soil, reinforced by composite cement curing agent mixed with ultrafine cement (UFC). The relationship among the UFC proportion, HA reagent content, soaking time, and sample strength was studied. The unconfined compressive strength test (UCS), scanning electron microscope (SEM), and PCAS microscopic quantitative test techniques were used to explore the mechanism of the effect of UFC on the strength of HA-containing cemented soil. The increasing UFC proportion in the composite cement curing agent gradually increased HA-containing cemented soil’s strength. UFC significantly reduced the percentage of macropores in HA-containing cemented soil and made the microstructure denser. The HA-containing cemented soil’s q u increased the most when the UFC proportion increased from 0% to 10%. The solidification effect of the composite cement curing agent mixed with UFC was always stronger than that of OPC. The composite cement curing agent with a UFC proportion of 10% is practical. Cement is still an important building material in the current construction industry, and UFC provides a new method for reducing environmental impact in engineering construction.

Keywords: peat soil; humic acid; cemented soil; ultra-fine cement; UCS; SEM; PCAS (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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