超微粒子水泥加固软土试验研究

应用和研发各种固化材料，对软土进行固化和改性，以改善其工程特性是当今国际上研究的热点课题。通过室内试验，研究了一种新型超微粒子水泥材料（ALOFIX-MC，简称MC）加固软土的效果，分析了其加固和改性机制。试验中，MC以0 %、1 %、2 %、3 %、4 %和5 %的掺量分别掺入到水泥掺量15 %和石膏掺量2 %的软土试样中，配制了6组试样。室内无侧限抗压强度试验结果表明，在15 %掺量的普通水泥土中掺入少量MC就可以显著提高软土的强度和稳定性。扫描电镜（SEM）分析表明，MC的胶结填充作用和MC对水泥水化的促进、孔隙的填充以及其本身的表面吸水作用对加固效果有重要影响。研究成果为进一步提高水泥土的工程性质和减少常规水泥土中水泥掺量提供了一条新的途径。

Experimental research of soft soil reinforcement using ALOFIX-MC

At present, improving the engineering properties of soft soil by developing and using solidification materials is a worldwide pop topic. A new cement material (ALOFIX-MC) is used to solidify the soft soil; and the mechanism of soil reinforcement is researched based on indoor tests. Different percentages of MC, i.e. 0 %, 1 % , 2 %, 3 %, 4 % and 5 % by weight of cement were randomly put into the soil samples which included 15 % cement content and 2 % gypsum content. Six samples were prepared and subjected to unconfined compressive strength test. The results show that a low MC content can significantly improve the strength and stability of cement soil with 15 % cement content. The microstructural analysis using scanning electron microscopy (SEM) shows that MC can provide new cementations, and MC improves the hydration of cement, pore filling, and water sorption, which contribute to significant improvement on solidification effect. The results have provided a new way for cement soil engineering property improvement and reduction of cement content in conventional cement soil.