复合低掺量水泥红黏土早期无侧限抗压强度试验

发布时间：2018-03-16 22:22

本文选题：无侧限抗压强度试验　切入点：水泥红黏土　出处：《中国科技论文》2015年21期 　论文类型：期刊论文

【摘要】：选取粉煤灰废弃物及价格低廉的聚丙烯纤维作为外掺剂,与内蒙古自治区中西部地区的红黏土一起制成一种特殊的水泥土。通过正交试验,研究水泥掺量、粉煤灰掺量、聚丙烯纤维掺量及混合体含水率对水泥土7d早期无侧限抗压强度的影响;然后利用电镜试验,从微观方面证明浆体的合理层理结构与纤维的固结加筋作用。结果表明,在一定的范围内,水泥掺量对其影响最大,其次为粉煤灰掺量,聚丙烯纤维掺量和混合体含水率的影响则较小,且最优配合(质量分数)比为水泥10%,粉煤灰16%,聚丙烯纤维0.12%,混合体含水率18%。第9组强度高于第1组。并对第9组(水泥掺量10%,粉煤灰掺量16%,纤维掺量0.10%,含水率16%)试块进行应力-应变曲线拟合,得出曲线上升段满足三次多项式方程,下降段满足二次多项式方程。
[Abstract]:Fly ash waste and low price polypropylene fiber were selected as admixtures to make a special cement soil with red clay in the central and western regions of Inner Mongolia Autonomous region. The content of cement and fly ash was studied by orthogonal test. The effect of polypropylene fiber content and mixed moisture content on the unconfined compressive strength of cement soil at the early stage of 7 days was studied, and the reasonable bedding structure of the slurry and the consolidation and reinforcement of the fiber were proved by the electron microscope test. In a certain range, the cement content has the greatest influence on it, followed by the fly ash content, the polypropylene fiber content and the water content of the mixture have little effect on it. The optimum blending ratio (mass fraction) is cement 10, fly ash 16, polypropylene fiber 0.12 and moisture content 180.The strength of the ninth group is higher than that of the first group (cement 10, fly ash 16, fiber 0.10, moisture 16). Fitting the stress-strain curve of the specimen, It is concluded that the ascending segment of the curve satisfies the cubic polynomial equation, and the descending segment satisfies the quadratic polynomial equation.
【作者单位】：内蒙古农业大学水利与土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51069008) 内蒙古自治区科技计划项目(20130425) 高等学校博士学科点专项科研基金资助项目(20121515110002)
【分类号】：TU411.6

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