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以掺钢渣土为主要研究对象,采用“透水石上吸水-自然风干”方法模拟路床材料的干湿循环状态,研究了掺钢渣土强度的干湿循环劣化性能,从强度破坏模式与微观机理分析石灰对钢渣活性激发的影响。结果表明:随着干湿循环次数的增加,试件含水率呈增大趋势并趋于稳定,变化幅度在3%以内。掺钢渣土无侧限抗压强度与劈裂强度的干湿循环劣化效果明显,其中石灰土的衰减幅度最大,分别为59.5%与55.3%,石灰钢渣土最小。劈裂抗拉强度与无侧限抗压强度比值结果发现,石灰土与石灰钢渣土随干湿循环次数变化,该比值f_t/f_(cu)基本稳定,在12.3~19.4之间,但钢渣土f_t/f_(cu)均小于12.8;钢渣土劈裂抗拉强度衰减幅度显著高于无侧限抗压强度,劈裂抗拉强度更能反映钢渣土的干湿循环劣化性能。干湿循环后掺钢渣土试件抗压强度与试件核心区的干湿循环劣化程度密切相关,而劈裂强度则更多的反映试件外围部分的强度特征。对比钢渣土与石灰钢渣土强度形成机理,验证钢渣在碱性环境中更易形成强度大的沸石类矿物。在工程应用中,建议掺入适量石灰。
The main research object is steel-dumped soil. The wet-dry cycle of the roadbed material is simulated by the method of “water on the permeable stone - natural air-drying” method. The degradation performance of wet- MECHANISM ANALYSIS OF EFFECT OF Lime on Excitation of Steel Slag. The results show that with the increase of the number of drying and wetting cycles, the moisture content of the specimens shows an increasing tendency and tends to be stable, with the variation range of less than 3%. Drying and wetting cycles with unconfined compressive strength and splitting strength of steel slag dregs are obviously degraded, of which limestone has the largest decay rate of 59.5% and 55.3%, respectively, and lime and steel slag are the least. The ratio of splitting tensile strength to unconfined compressive strength shows that the ratio of f_t / f_ (cu) is almost constant between 12.3 and 19.4 for limestone and lime-steel slag, however, f_t / f_ (cu) are all less than 12.8. The attenuation of tensile strength of steel slag is much higher than that of unconfined compressive strength, and the splitting tensile strength can better reflect the deterioration performance of steel slag. The compressive strength of the steel slag samples after wet-dry cycle is closely related to the degree of deterioration of the wetting and drying cycles in the core region of the test piece, while the splitting strength reflects more the strength characteristics of the peripheral part of the test piece. Comparing the formation mechanism of the strength between the steel slag and the lime steel slag, it is verified that the steel slag is more likely to form zeolite minerals with greater strength in alkaline environment. In engineering applications, it is advisable to incorporate appropriate amounts of lime.