Investigation on rheological and strength characteristics of cement-treated dredged materials
Investigation on rheological and strength characteristics of cement-treated dredged materials
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DOI：
10.1080/1064119x.2021.1992050
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发表时间：
2021-10
影响因子：
2.2
通讯作者：
Feng Ji;J. Weng;Miao-miao Song;Da-jun Yao;Dan Zhang
中科院分区：
文献类型：
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作者：
Feng Ji;J. Weng;Miao-miao Song;Da-jun Yao;Dan Zhang
摘要利用水力疏浚技术获得的疏浚物（DM）的有益利用是一个挑战，因为它们的行为像泥浆具有非常高的含水量。通过试验研究了初始含水率和水泥掺量对高初始含水率水泥改性DM试样流动性、粘度和强度特性的影响。对不同初始含水量和水泥掺量的水泥处理DM试件进行了一系列流动性、粘度和无侧限抗压强度试验。试验结果表明，随着初始含水量的增加，坍落度流动度几乎呈线性增加。水泥掺量对不同初始含水量下的坍落度变化的影响呈现相同的减小趋势。水泥处理的DM试样的新鲜混合物表现得像宾汉塑料。随着初始含水量的增加和水泥用量的减少，动粘度降低。滑塌流动随粘度或屈服应力的增加而减小，遵循幂趋势线。所有水泥处理的标本固化28天表现出应变软化行为。无侧限抗压强度随着初始含水量的增加和水泥掺量的减少而降低。建立了水泥土抗压强度与初始含水量和水泥含量的定量关系式。
Abstract Beneficial use of dredged materials (DMs) obtained using the hydraulic dredging technique is a challenge since they behave like slurry with very high-water content. This paper presents an experimental study on the impacts of initial water contents and cement content on flowability, viscosity, and strength characteristic of cement-treated DM samples at high-initial water contents. A series of flow, viscosity and unconfined compressive strength tests were conducted on cement-treated DM specimens with various initial water contents and cement contents. Tests results showed that the value of slump flow increases almost linearly with increasing initial water content. The effect of cement content on slump flow for specimens at various initial water contents follows the same decreasing trend. Fresh mixtures of cement-treated DM specimens behave like Bingham plastic. Dynamic viscosity reduces with the increase in initial water content and the decrease in cement content. Slump flow reduces with the increase in viscosity or yield stress following a power trend line. All cement-treated specimens curing for 28 days exhibit strain-softening behavior. Unconfined compressive strength reduces as the initial water content increases and cement content decreases. A quantitative equation was developed to estimate the compressive strength as a function of initial water content and cement content.