大掺量粉煤灰淤泥固化土的强度与耐久性研究

基于传统水泥和石灰固化处理方法，提出了利用大掺量低钙粉煤灰、水泥和石灰固化剂进行淤泥固化处理的方法，以期改善淤泥的强度和耐久性，达到淤泥和粉煤灰双重资源化利用的目的。通过一系列室内试验，探讨了该方法处理后固化淤泥的击实特征、强度特性、水稳性和耐久性。试验结果表明：淤泥固化后最优含水率有所降低、最大干密度则略有增加；弹性模量、无侧限抗压强度和抗拉强度均有不同程度的增加，水泥掺量越大，养护时间越长，强度和弹性模量越大；固化后淤泥水稳性得到明显改善；浸水软化和冻融循环导致固化土抗压强度显著劣化，冻胀融缩导致设计混合料的无侧限抗压强度减小约22%。

Research on strength and durability of sediments solidified with high volume fly ash

Based on the traditional cement-treatment and lime-treatment methods, the stabilizers by using high volume low-calcium fly ash, lime and cement are proposed, in order to improve the strength and durability of marine sediments and to achieve the resource utilization of marine sediment and low-calcium fly ash. A series of laboratory tests were performed to investigate the variation of compaction characteristic, strength property, water stability and durability of solidified marine sediments. The experimental results show that the addition of designed stabilizers causes a decrease in optimum water content and a very slight increase in maximum dry density compared to untreated sediments. The elastic modulus, unconfined compressive strength and tensile strength increase to different levels, while the strength and elastic modulus increases more significantly with higher cement content and longer curing time. The water stability can be greatly ameliorated after solidification treatment compared to untreated sediments. Finally, the strength performance of solidified sediments could be significantly decreased by water immersion damage and thawing-freezing cycles, and the unconfined compressive strengths of designed materials are decreased by about 22% due to the thawing-freezing cycles.