关键词: 塑性混凝土, 黏土, 配合比试验, 防渗, 抗压强度, 弹性模量

Abstract: Experimental tests on plastic concrete are conducted in this study by using engineering analogy method and comparing 22 sets of different mixing proportion under its performance requirements provided by the designer. We focus on the concrete’s design schemes of single clay mixing and the influence of raw materials and age on the performance, using four evaluation indexes, i.e., cubic compressive strength, elasticity modulus, triaxial compressive strength, and permeability coefficient. Results show that all of these schemes can meet the engineering requirements. And when the clay content is within a certain range (< 80 kg/m3), concrete strength is reduced with an increase in it while elastic modulus varies in the opposite trend; when the content is bigger than 80 kg/m3, a further increase causes elastic modulus to fluctuate within a certain range but no significant change in concrete strength. The concrete strength and elastic modulus are positively correlated with the cement content, while negatively correlated with the bentonite content. Under triaxial confining pressure, the two sets of optimal mix proportion feature a compressive strength increased by 19% on average at the 90 d age compared to the 28 d age, and their permeability coefficients at 90 d age are lower than those at 28 d age.

Key words: plastic concrete, clay, mix proportion experiment, anti-seepage, compressive strength, elasticity modulus