HIGH-STRENGTHENING OF CEMENT-TREATED CLAY BY MECHANICAL DEHYDRATION
HIGH-STRENGTHENING OF CEMENT-TREATED CLAY BY MECHANICAL DEHYDRATION
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DOI：
10.3208/sandf.47.171
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发表时间：
2007-04
影响因子：
3.7
通讯作者：
K. Kasama;K. Zen;Kiyoharu Iwataki
中科院分区：
文献类型：
--
作者：
K. Kasama;K. Zen;Kiyoharu Iwataki
提出了一种新的软粘土水泥浆再生技术--水泥搅拌机械脱水法。为了评价CMD对提高软粘土强度的有效性，进行了一系列的无侧限压缩试验和几个耐久性试验，并对水泥土的无侧限抗压强度进行了文献综述。此外，还进行了一系列恒应变速率固结试验，以评价水泥含量和脱水速度对水泥稳定粘土渗透性能的影响。1)对水泥土抗剪强度的文献综述和理论分析表明，为提高水泥土的密实度而进行的附加处理对提高水泥土的抗剪强度是有效的。2)水泥掺入加速了高压软粘土的机械脱水，水泥处理粘土的固结系数随水泥掺量的增加而增大。3)对于水泥含量在20%以上、脱水压力在20 Mpa以上的软粘土，经CMD处理后，可以得到无侧限抗压强度大于20 Mpa的高强试件。
A technique called the cement-mixing and mechanical dehydration method (CMD) as one of recycling techniques for soft clay slurry is developed. In order to evaluate the effectiveness of the CMD for increasing the strength of soft clay, a series of unconfined compression tests and several durability tests were performed together with the literature review of unconfined compressive strength in cement-treated soils. Moreover, a series of constant strain rate consolidation tests were also performed to evaluate the effects of cement content and dehydration speed on the permeability of cement-treated clay. The following conclusions are obtained: 1) Literature review and theoretical considerations on the shear strength of cement-treated soils show that an additional treatment for the purpose of increasing the density of cement-treated specimen is effective for increasing the shear strength of cement-treated soil. 2) The mechanical dehydration of soft clay with high pressure is accelerated by cement mixing, where the coefficient of consolidation of cement-treated clay increases as the cement content increases. 3) The high-strength specimen having the unconfined compressive strength of more than 20 MPa can be created from soft clay treated by the CMD with the cement content of over 20% and the dehydration pressure of 20 MPa.