材料期刊网

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.

In order to have a more comprehensive study about the mechanic and permeability of the soil-cement under the influence of the additives, there was a series of tests based on the orthogonal design method with a overall consideration of the influence of moisture content, cement content, water reducing agent content, fly ash content and other factors.Then according to the test, the unconfined compressive strength and permeability coefficient were obtained at the age of 3 d, 7 d and 28 d respectively, and the influence law of various factors on test were mastered and the relationship between them was simulated by SPSS software.The test results show that the order about the three factors against the unconfined compressive strength and permeability coefficient are moisture content, cement content, water reducing agent content,fly ash content.With the increase of moisture content, the cement-soil compressive strength decreases gradually and the permeability coefficient constantly increasing while the impact trend of cement content on the contrary.With the increase of water reducing agent of the sample, the strength curves were under the opening parabolas while the permeability coefficient curves were "V" shape change.In the practical engineering need according to the corresponding engineering goal and combined with field test to determine the best mix.In the cement-soil mixed a moderate amount of fly ash had no obvious effect on the strength.But it can reduce the permeability of the soil-cement especially in short ages.