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海南省沿海地区分布着一种特殊的有机质浸染砂,单纯采用水泥作为固化剂的深层搅拌法不能有效提高其力学强度,因此选用不同材料做外掺剂对其进行了大量的固化试验。通过不同水泥、不同水泥掺入比、不同固化材料及其掺入比、不同水灰比和龄期下水泥土的无侧限抗压强度试验以及微观结构试验,研究了有机质浸染砂的最优固化材料及水泥土的配合比;分析了水泥土的力学行为、变化规律和加固机理,发现单纯采用水泥不能有效加固海湾相有机质浸染砂的原因是水泥的水解水化作用会发生延缓,以及砂颗粒与水解水化产物的作用受到阻碍,掺入适量的熟石灰可获得较好的加固效果。
A special kind of organic-contaminated sand is distributed in the coastal area of Hainan Province. The deep mixing method using pure cement as the curing agent can not effectively improve its mechanical strength. Therefore, a large amount of curing experiments were conducted using different materials as external admixture. Based on the unconfined compressive strength tests and the microstructure tests of different cements, different cement incorporation ratios, different curing materials and their incorporation ratios, different cement ratios under different water-cement ratios and ages, the optimum solidification of organic matter- The results show that the reason why purely using cement can not effectively reinforce the cohesion of sand with organic matter in the Gulf is that the hydration of cement hydration will be delayed, Hydrolysis of hydration products and the role of being hindered, adding appropriate amount of hydrated lime can get better reinforcement.