Građevinar, Vol. 76 No. 10., 2024.
Original scientific paper
https://doi.org/10.14256/JCE.3809.2023
Physical and mechanical properties of weathered sandstone rock-like materials under freeze-thaw cycles
Zhang Zhen
Wang Qingzhi
Zhang Kui
Fang Jianhong
Abstract
Block stone structural layers are commonly utilized in roadbed projects within permafrost areas. However, due to significant temperature fluctuations and frequent freeze-thaw cycles, some of these rock layers have weathered and fractured. Continuous weathering of these rocks results in the block stone embankment gaps becoming clogged, reducing macropore and porous media areas. Consequently, the convective heat transfer function of the block stone roadbed diminishes, failing to adequately protect the frozen soil. This study aims to assess whether recycled weathered rock materials, modified with cement, can match the mechanical properties and damage expansion characteristics of unweathered rocks. Weathered sandstone was selected for modification into rock-like materials. Detailed investigations were conducted into their physical and mechanical properties, alongside damage propagation characteristics following freeze-thaw cycles. Compared to red sandstone, weathered sandstone rock materials exhibit significantly enhanced compressive strength, aligning freeze-thaw damage models with red sandstone rock characteristics, thereby affirming the feasibility of reusing weathered sandstone rocks.
Keywords
physical and mechanical properties; sandstone; freezing and thawing cycles
Hrčak ID:
323838
URI
Publication date:
18.11.2024.
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