Engineering characteristics and mechanism of rice husk ash-ground granulated blast slag cured expansive soil

被引：2
|
作者：
Li L.-H. [1 ,2 ]
Li Z.-J. [1 ,2 ]
Xiao H.-L. [1 ,2 ]
Huang S.-P. [1 ,2 ]
Liu Y.-M. [1 ,2 ]
机构：
[1] School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan
[2] Key Laboratory of Health Intelligent Perception and Ecological Restoration of River and Lake, Ministry of Education, Hubei University of Technology, Wuhan
来源：
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2023年 / 57卷 / 09期
关键词：
curing mechanism; engineering characteristics; expansive soil; rice husk ash-ground granulated blast slag (RHA-GGBS); solidification/stabilization;
D O I：
10.3785/j.issn.1008-973X.2023.09.005
中图分类号：
学科分类号：
摘要：
In order to improve the mechanical properties of expansive soil and improve its stability of expansion deformation, by means of unconfined compressive strength, free expansion rate, scanning electron microscopy and X-ray diffraction, the solidification effect and the mechanism of expansive soil with industrial solid waste rice husk ash-ground granulated blast slag (RHA-GGBS) as environmental curing agent were studied. Results show that the curing agent significantly improves the mechanical properties of expansive soil. When the ratio exceeded 6∶4 or the mass fraction of RHA-GGBS exceeded 10%, the mechanical properties did not increase but decrease. The reasons for the decrease of free expansion rate before and after curing are different. Before curing, it is a substitution effect, and after curing, it is a hydration reaction. The decrease of free expansion rate after curing was higher than that of uncured samples, and the decrease of free expansion rate after curing was 3.6 times higher than that of uncured samples. Sample generated agglomerates, small amount of needle stick and large amount of amorphous gel under the 10% RHA-GGBS mass fraction critical value conditions, which were distributed on the soil surface and fill the pores. RHA-GGBS can improve the strength of the soil body, reduce the expansion of the soil, RHA-GGBS mass fraction exceeds the critical value, there is an excess of SiO2 can not be reacted, by the total amount of product limitations, the curing is affected by varying degrees of inhibition. © 2023 Zhejiang University. All rights reserved.
引用
收藏
页码：1736 / 1745
页数：9
相关论文
共 30 条
  • [1] (1997)
  • [2] Editorial Department of China Journal of Highway and Transport. Review on China’s subgrade engineering research·2021 [J], China Journal of Highway and Transport, 34, 3, pp. 1-49, (2021)
  • [3] XU Yong-fu, CHENG Yan, TANG Hong-hua, Failure characteristics of expansive soil slope and standardization of slope slide prevention by geotextile bag [J], Journal of Central South University: Science and Technology, 53, 1, pp. 1-20, (2022)
  • [4] ZOU Wei-lie, LIN Jian-guo, HAN Zhong, Et al., Progress on strengthening techniques for expansive soil slopes [J], Journal of Central South University: Science and Technology, 53, 1, pp. 126-139, (2022)
  • [5] LI Li-hua, YU Xiao-ting, XIAO Heng-lin, Et al., Mechanical properties of reinforcement about rice husk ash mixed soil [J], Rock and Soil Mechanics, 41, 7, pp. 2168-2178, (2020)
  • [6] LI Li-hua, YUE Yu-wei, LI Wen-tao, Et al., Mechanical properties and microstructure of heavy metal contaminated soil solidified by rice husk ash [J], Journal of Railway Science and Engineering, 19, 11, pp. 3275-3282, (2022)
  • [7] MA B, CAI K, ZENG X, Et al., Experimental study on physical-mechanical properties of expansive soil improved by multiple admixtures, Advances in Civil Engineering, 2021, (2021)
  • [8] SONG Hui-ping, AN Quan, SHEN Wu-yan, Et al., Preparation of solid waste-based soil conditioners and their ecological remediation effects on mining area [J], Environmental Engineering, 40, 12, pp. 187-195, (2022)
  • [9] CHEN Pei, WU Ao, BIE Ru-shan, Experimental study on pretreated rice husk combustion in bench-scale fluidized bed for the production of nanosilica [J], Journal of Harbin Institute of Technology, 51, 3, pp. 46-54, (2019)
  • [10] TAHA M M M, FENG C P, AHMED S H S., Modification of mechanical properties of expansive soil from north China by using rice husk ash, Materials, 14, 11, (2021)
123