氯氧镁水泥固化淤泥力学性能试验与微观机理研究

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孙阳,刘文化,李吴刚,洪国钱,桑进,陶阳.氯氧镁水泥固化淤泥力学性能试验与微观机理研究[J].,2023,63(3):313-320

氯氧镁水泥固化淤泥力学性能试验与微观机理研究

Mechanical properties experiment and micro-mechanisms study of solidified sludge with magnesium oxychloride cement

DOI：10.7511/dllgxb202303011

中文关键词:氯氧镁水泥(MOC)水氯比淤泥固化强度

英文关键词:magnesium oxychloride cement(MOC)H2O and MgCl2 molar ratio sludge solidification strength

基金项目:国家自然科学基金资助项目(5200904951709129).

作者	单位
孙阳,刘文化,李吴刚,洪国钱,桑进,陶阳

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中文摘要:

绿色低碳的氯氧镁水泥(MOC)在淤泥固化中具有较好的应用前景．目前，MOC固化淤泥领域对于MOC净浆中认为的较优水氯比区间(n(H2O)/n(MgCl2)=12~21)研究较少，相关反应机理尚不明确．选取5组满足该区间的水氯比(n(H2O)/n(MgCl2)=16，17，18，19，20)，通过无侧限抗压强度(UCS)、酸碱度(pH)、扫描电镜(SEM)和X射线衍射(XRD)等试验，研究了水氯比、MgO掺量以及养护龄期对MOC固化淤泥力学性能以及微观机理的影响．结果表明：MOC固化淤泥的最优水氯比为17；MOC固化淤泥早强显著，但14 d后无侧限抗压强度会有所下降；相同水氯比下，MgO掺量越高，生成的产物越多，无侧限抗压强度越大，pH也越高；MOC固化淤泥的产物以三相(3Mg(OH)2·MgCl2·8H2O)为主，并含有少量五相产物(5Mg(OH)2·MgCl2·8H2O)．研究成果可为MOC在淤泥固化领域中的应用提供理论支撑．

英文摘要:

Green and low-carbon magnesium oxychloride cement (MOC) has a good application prospect in sludge solidification. At present, there are few studies on the optimal H2O and MgCl2 molar ratio interval (n(H2O)/n(MgCl2)=12-21) of MOC paste in solidified sludge with MOC and the related reaction mechanism isn′t clear yet. Five H2O and MgCl2 molar ratios (n(H2O)/n(MgCl2)=16, 17, 18, 19, 20), which are in the H2O and MgCl2 molar ratio interval, are used to study the influence of the H2O and MgCl2 molar ratio, MgO mass fraction and curing time on mechanical properties and micro-mechanisms of MOC solidified sludge. The unconfined compressive strength (UCS), acid-base (pH), scanning electron microscopy (SEM) and X-ray diffraction (XRD) tests are performed on the MOC solidified sludge. The results indicate that the optimum H2O and MgCl2 molar ratio for MOC solidified sludge is 17. MOC solidified sludge has excellent early strength. However, the unconfined compressive strength decreases after 14 d. Under the same H2O and MgCl2 molar ratio, the higher MgO mass fraction produces more hydration products, resulting in higher unconfined compressive strength and higher pH. The hydration products of MOC solidified sludge are mainly three phase (3Mg(OH)2·MgCl2·8H2O) and a small amount of five phase (5Mg(OH)2·MgCl2·8H2O). The results can provide theoretical support for the application of MOC in the field of sludge solidification.

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