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- Title
水泥-碱渣改良膨胀土干湿循环耐久性及其 劣化机制试验研究.
- Authors
刘晶晶; 吴东彪; 许龙; 于鹏; 黄生伍
- Abstract
An evaluation on the engineering properties and cyclic drying-wetting durability of the cement-soda residue treated expansive soils was carried out depending on the systematic laboratory tests. Some microscopic technologies were applied to reveal the modification mechanisms associated with the treated soils, as well as the deterioration mechanisms subjected to drying-wetting cycles. Results show that liquid limit, plasticity index and free swelling index of the expansive soil decrease obviously with addition of cement-soda residue, while the unconfined compressive strength increases significantly. Decreasing the mass ratio of cement to soda residue causes some deterioration of engineering properties due to the formation of a complex (CaO·SiO2·CaCO3·nH2O) with a low bonding capacity. During the initial period of drying-wetting cycles, there is no obvious changes in the macro-morphology and strength of the treated samples. With the cycles of drying-wetting increasing, the soil strength decreases significantly, and the macro-morphology is characterized as spalling. Under cyclic drying-wetting conditions, the deterioration mechanisms of the treated soil can be attributed to the damage of bonding structures formed by hydrated cementitious products and the generation of micro-cracks and further expansion.
- Publication
Science Technology & Engineering, 2023, Vol 23, Issue 21, p9207
- ISSN
1671-1815
- Publication type
Article