改性海相淤泥工程特性试验研究

将性能优异的土壤固化剂(HAS)应用于海相淤泥的改性处理。通过直接剪切、无侧限抗压强度灵敏度、标准固结试验、孔隙分析X射线衍射及扫描电镜等现代测试手段,研究了改性淤泥的强度特性,探讨固化剂的改性淤泥的机理。试验结果表明,一定掺量下的灰渣胶凝材料能够显著提高改性淤泥的各个龄期强度,改性淤泥的早期强度较高,后期强度能持续增长,同时具有良好的耐水浸泡性。扫描电镜试验结果表明,由于固化剂的加入,彻底改变了淤泥结构。在改性淤泥中,主体结构为钙矾石晶体形成的“空间网状结构”,辅助结构为在碱性环境中土颗粒之间的离子交换、团粒化作用和碳酸化作用所形成的微晶体与凝胶体结构。

On Engineering Characteristics of Ocean Sludge Treated with HAS

The hydraulic ash-slag cementitious material(HAS) with particular characteristics was used as a new kind of binding agent for solidification/stabilization with ocean sludge.Based on the direct shear,sensitivity of unconfined compressive strength,standard consolidation test,X-ray diffraction(XRD) and SEM,the mechanism and strength characteristics of treated sludge are analyzed.The results suggest that HAS can greatly improve the unconfined compressive strength of sludge at various curing periods;the early strength is quite high,and the long-term strength can increase continuously,and with a good ability of water resistance.However,the soil structure of sludge changes completely with materials added to it.In the consolidated sludge,the principal structure is the "spatial cellular structure" of calcium crystal.The supplementary structure is the micro-crystal and gel structure which is formed among the soil particles in alkaline environment through ion exchange,aggregation and carbonation.