|Table of Contents|

Study on compressive property of cement soil modified by silica fume under freeze-thaw cycle(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年04期
Page:
124-135
Research Field:
建筑材料
Publishing date:

Info

Title:
Study on compressive property of cement soil modified by silica fume under freeze-thaw cycle
Author(s):
DUAN Xinge1;  YANG Xinhong2;  ZHANG Jiupeng3
(1. The 3rd Engineering Co., Ltd., of China Railway 16th Bureau Group, Huzhou 313000, Zhejiang, China; 2. Construction Management Branch of Shaanxi Transportation Holding Group Ltd., Xi'an 710065, Shaanxi, China; 3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
road engineering;  silica fume-cement soil;  compressive property;  freeze-thaw cycle;  gelling agent
PACS:
TU528
DOI:
10.19815/j.jace.2024.03034
Abstract:
As a common method of reinforcing road subgrade soil in highway engineering, cement soil has the advantages of low cost and favorable mechanical properties. However, its compressive properties tend to deteriorate under freeze-thaw conditions, leading to destabilization and damage to the road's structural layer. Therefore, silica fume was utilized as an auxiliary gelling agent to study the composite improvement of cement soil. The unconfined compressive strength test and freeze-thaw cycle test were conducted to examine the changes in compressive strength of silica fume-cement soil under different curing ages, gelling agent ratios, and freeze-thaw cycles. The results show that the effect of silica fumes on the early compressive strength of cement soil is limited, and the later compressive strength is significantly improved. The addition of silica fume can increase the 28 d unconfined compressive strength of cement soil samples by up to 8%. Silica fume demonstrates a significant positive impact on the freeze-thaw performance of the cement soil, with the freezing index of cement soil sample can be increased by up to 35% compared with that of pure cement sample. Optimal frost resistance of the silica fume-cement soil samples is achieved when the content of silica fume is 20%-30%. The prediction model for unconfined compressive strength is established considering the proportion of silica fume to cement, the curing age and the freeze-thaw cycle, which can realize the accurate prediction of compressive strength of silica fume-cement soil.

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Last Update: 2025-07-10