原文传递
Experimental study on the use of compound alkaline materials to solidify lake sediments
| 题名： | Experimental study on the use of compound alkaline materials to solidify lake sediments |
| 正文语种： | eng |
| 作者： | Hongdan Yu;Kai Zhang;Haifeng Lu;Qingzhao Zhang |
| 作者单位： | State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics at the Chinese Academy of Sciences in Wuhan Hubei China;School of Civil Engineering and Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province at Wuhan University in Wuhan Hubei China;School of Civil Engineering and Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province at Wuhan University;School of Civil Engineering and Department of Geotechnical Engineering at Tongji University in Shanghai China |
| 关键词： | Alkali-activated reaction; compressive strength; lake sediment; orthogonal experiment; sodium silicate; straw ash |
| 摘要： | The disposal of lake sediment is a major problem in dredging and lakeside construction projects. Due to its poor mechanical properties and contamination, sediment is difficult to use directly in resource applications. Previous research has found that alkali-activated reactions can improve the mechanical properties of silicon- and aluminum-rich solid waste. In this study, the basic physical and mechanical properties of dried sediment from a lake in Wuhan, China, were analyzed. Orthogonal tests, compressive strength measurements, and X-ray diffraction spectrum and scanning electron microscope analyses were used to investigate the solidification effects of three types of alkaline materials used alone or in combination with the lake sediment: straw ash, calcium lime, and sodium silicate. In the single-doped samples, calcium lime had the best curing effect, with a maximum seven-day compressive strength of 1.31 MPa (190 psi). When the compound-doped samples were cured to seven days, the maximum compressive strength was 7.18 MPa (1040 psi). Furthermore, with the compound-doped materials, sediment solidification was aided by suitably alkaline conditions and large quantities of active silicon-calcium components. As a result, the microstruc-tures of the cured compound-doped samples were more compact and their overall mechanical properties were greatly improved. |
| 出版年： | 2023 |
| 期刊名称： | PCI Journal |
| 卷： | 68 |
| 期： | 5 |
| 页码： | 42-56 |
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