有机质对水泥固化淤泥土的力学特性影响试验研究

An Experimental Research on the Effect of Organic Matter on Mechanical Properties of Cementing Solidified Silt

针对有机质对水泥固化淤泥土强度的不良影响,在南沙淤泥土干粉中添加腐殖酸配制得到不同有机质质量分数的淤泥土,采用不同质量分数的水泥对其进行固化,进行无侧限抗压强度试验,探讨了水泥及有机质质量分数、龄期对固化的有机质淤泥土无侧限抗压强度的影响.试验结果表明:有机质的存在严重阻碍水泥的水化反应,但有机质质量分数对水泥固化淤泥土强度的影响是有极限的,超过5%时,有机质质量分数的增加对固化土强度下降的影响就不明显了;固化土的强度随水泥质量分数的增加呈幂函数形式增长;随龄期的增长,含有机质的水泥土强度仍远低于普通水泥土的强度,表明有机质的影响并不会随龄期增长而减小.

In order to study the adverse influences of organic matter on the strength of cementing solidified silt,humic acid was added to the dry silt to prepare silt with different organic matter content, then it was reinforced with different mass fractions of cement. The unconfined compressive strength test was used to analyze the content of organic matter and the effects of age on UCS of solidified organic silt. The test results show that the existence of organic matter seriously hinders the hydration reaction of cement, but the influence of organic matter on the strength of cementing solidified silt is limited, and beyond this limit(5%), the effect of the increase of organic matter content on the strength decline of cementing solidified silt is not obvious. The strength of cementing solidified silt increases exponentially with the increase of cement content. As the age increases, the strength of organic cementing solidified silt is still far lower than that of ordinary cementing solidified silt, indicating that the influence of organic matter does not decrease with age.