膨润土类型对塑性混凝土性能的影响

Influence of bentonite types on the properties of plastic concrete

通过塑性混凝土抗压、劈拉、抗折、渗透、抗渗性和弹性模量试验,对比分析了钙基膨润土和钠基膨润土对塑性混凝土强度、渗透性、相对抗渗性和弹性模量的影响。结果表明,基于同一组配合比,在掺加一定量粘土的情况下,分别掺加等量的钙基膨润土和钠基膨润土,掺钠基膨润土的塑性混凝土的抗压强度、劈拉强度、抗折强度和弹性模量分别是掺钙基膨润土的塑性混凝土相应强度的两倍以上,渗透系数大和相对渗透系数也有较大提高。膨润土的粒度、胶质价、膨胀倍和吸蓝量等是影响塑性混凝土性能的主要因素。

Based on the experiments of compression, splitting tension, bending, permeability, anti-permeability and elastic modulus, the influences of calcium-based bentonite and sodium-based bentonite on the strengths, permeability, relative anti-permeability and elastic modulus of plastic concrete are contrastly studied. The results show that the compressive strength, splitting tensile strength, flexural strength and elastic modulus of sodium-based bentonite plastic concrete are respectively above twice larger than those of calcium-based bentonite plastic concrete under the condition of mixing certain clay soil, the permeability coefficient and relative permeability coefficient of the former are also greater than those of the latter. The indexes such as grain size, colloid index, expansion multiple and ethylene blue adsorbed bentonite are the main influence factors of the performance of plastic concretus.