三元协同固化土的力学性质研究
Journal: Building Development DOI: 10.12238/bd.v9i1.4323
Abstract
以工业固废拜耳法赤泥(RM)、电石渣(CCS)、脱硫石膏(DG)协同制备固化剂并对粉质黏土进行改良。首先,探究不同固化剂掺量对粉质黏土的力学性能影响规律,确定固化剂的掺量影响；随后,探究固化剂固化土的耐久性能。试验结果表明：固化剂掺量为25%时,对粉质黏土的固化效果较好,其7d、28d抗压强度分别达到了1.6MPa、2.16MPa；经过5次干湿循环和冻融循环后,RDC25固化土强度损失分别为29.95%和42.26%。研究表明：拜耳法赤泥的潜在活性主要来源于氧化铝和氧化硅,通过电石渣的补钙和脱硫石膏的硫酸盐激发作用,赤泥的活性得以激发,其水化产物主要为水化硅酸钙(C-S-H)、水化铝酸钙(C-A-H)、钙矾石(Aft),三者胶结、填充土壤的内部空隙,使土的结构更加密实,进而力学性能得到提高。
Keywords
拜耳法赤泥；力学性能；耐久性能；微观固化机理
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