减水剂影响下水泥土力学与渗透特性研究

发布时间：2018-04-15 21:16

  本文选题：水泥土 + 外加剂　； 参考：《硅酸盐通报》2017年05期

【摘要】：为了研究水泥土在外加剂作用下的强度与渗透特性,综合考虑含水率、水泥掺量、减水剂含量与粉煤灰掺量等因素的影响,基于正交设计方法进行一系列试验研究,得到了龄期为3 d、7 d和28 d时水泥土的无侧限抗压强度和渗透系数,以及各个因素对其影响的规律,并利用SPSS软件对它们之间的关系进行了拟合。试验结果表明:这4种因素对水泥土抗压强度及渗透系数影响的主次顺序均为:含水率→水泥掺量→减水剂含量→粉煤灰掺量。随含水率增加,水泥土抗压强度逐渐降低,渗透系数不断增大;而水泥掺量的影响趋势则与之相反;随试样中减水剂含量增加,其抗压强度和渗透系数分别呈下开口抛物线和"V"形变化,在实际工程中需根据相应工程目标并结合现场试验确定最佳掺入量;在水泥土中掺入适量粉煤灰对其强度无明显影响,但是可降低水泥土的渗透性,在龄期较短时更为显著。
[Abstract]:In order to study the strength and permeability of cement-soil under the action of admixture, considering the influence of water content, cement content, water reducer content and fly ash content, a series of experiments were carried out based on orthogonal design method.The unconfined compressive strength and permeability coefficient of cement-soil were obtained when the ages were 3 d ~ 7 d and 28 d, and the influence of each factor on them was obtained. The relationship between them was fitted by SPSS software.The experimental results show that the main and secondary order of the influence of these four factors on the compressive strength and permeability coefficient of cement-soil is the content of water content and the content of water reducer and the content of fly ash.With the increase of moisture content, the compressive strength of cement-soil decreases gradually, and the permeability coefficient increases, while the influence trend of cement content is opposite, and the content of water-reducing agent increases with the increase of water reducing agent content in the sample.The compressive strength and permeability coefficient change in the form of parabola and "V", respectively. In actual engineering, the optimum mixing amount should be determined according to the corresponding engineering objectives and combined with field tests, and the addition of proper amount of fly ash to cement soil has no obvious effect on its strength.But it can reduce the permeability of cement soil, and is more obvious in short time.
【作者单位】： 长沙理工大学水利工程学院;水沙科学与水灾害防治湖南省重点实验室;
【基金】：国家自然科学基金(51508039) 湖南省重大水利科技项目(湘财农指[2015]245号)
【分类号】：TU528
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本文编号：1755807