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工程实践发现水泥固化软土受土体腐殖酸成分的影响。当前,土体腐殖酸组分对水泥土固化影响已成为岩土工程研究的重要课题之一。通过在实际工程采样对水泥加固土腐殖酸组分进行定性、定量对比试验分析,以研究不同水泥掺量、不同地域水泥固化土腐殖酸组分的影响效果。试验结果表明:由红外光谱(IR)试验表现在水泥环境中胡敏酸组分的羧基量增多,水泥土阳离子交换量(CEC)随水泥掺量增加而增大;在5%、10%、20%水泥掺入比之水泥土中,由灰色关联分析结果证实,富里酸组分对水泥土无侧限抗压强度影响效果较强。水泥土腐殖酸组分可与水泥产物Ca2+、AI3+反应,在水泥土环境生成钙、铝键等复合体,它们可能影响水泥水解水化反应,削减水泥所能达到的固化效果。
Engineering practice found that the cement-cured soft soil is influenced by the humic acid composition of the soil. At present, the influence of soil humic acid components on the solidification of cement soil has become one of the important topics in geotechnical engineering. Through the practical engineering sampling, the humic acid components of cement-stabilized soil were qualitatively and quantitatively compared to analyze the effects of different amounts of cement and humic acid components in different regions. The results showed that the amount of carboxyl groups in the humic acid component increased in the cement environment by infrared spectroscopy (IR), the CEC increased with the increase of cement content, and the content of CEC increased at 5%, 10% The results of gray relational analysis confirm that the fulvic acid component has a strong effect on the unconfined compressive strength of cement-soil. The humic acid component of cement soil can react with the cement products Ca2 +, AI3 + and generate calcium, aluminum bonds and other complexes in the cement soil environment, which may affect the hydration reaction of cement hydration and reduce the curing effect that can be achieved by the cement.