Institute of Geotechnical Engineering, Yangzhou University, Yangzhou, 225127, China.
Environ Sci Pollut Res Int. 2021 Aug;28(31):42798-42806. doi: 10.1007/s11356-021-13776-y. Epub 2021 Apr 6.
At present, plastic concrete is widely used in anti-seepage engineering, and its strength and hydraulic conductivity are important indexes of plastic concrete cutoff walls. The pondus hydrogenii (pH) and electrical conductivity (EC) have an important effect on the strength and hydraulic conductivity of plastic concrete cutoff walls. However, it is not clear why the pH and EC are related to the strength and permeability of these walls. For this reason, plastic concrete composed of sand, cement, water, and bentonite was taken as the research object to study the influence of different mix ratios and curing ages on the unconfined compressive strength and permeability of plastic concrete. The pH and EC of the corresponding mix ratio and curing age were measured. The effects of the pH and EC on the strength and permeability of plastic concrete were studied, and the internal reason was explored from the product type and hydration reaction degree of plastic concrete. Furthermore, the quantitative relationship between pH and EC and the strength and hydraulic conductivity of plastic concrete was established. With increasing cement content, the strength, pH, and EC of plastic concrete increase continuously, while the hydraulic conductivity decreases. With increasing curing age, the strength increases, the hydraulic conductivity decreases, and both the pH and EC show a trend of first increasing and then decreasing. The pH value and electrical conductivity can reflect the product type and hydration reaction degree of plastic concrete, further affecting its strength and hydraulic conductivity. Under different dosage and curing age conditions, the pH showed three stages, namely, 11.7-12.27, 12.27-2.5, and 12.5-12.75, and there is a good power functional relationship among the EC and strength and hydraulic conductivity at each stage.
目前，塑性混凝土在防渗工程中得到了广泛应用，其强度和水力传导率是塑性混凝土防渗墙的重要指标。氢离子浓度（pH 值）和电导率（EC）对塑性混凝土防渗墙的强度和水力传导率有重要影响。然而，其 pH 值和 EC 值与这些墙体的强度和渗透性之间的关系尚不清楚。为此，以砂、水泥、水和膨润土组成的塑性混凝土为研究对象，研究不同配合比和养护龄期对塑性混凝土无侧限抗压强度和渗透性的影响。测量相应配合比和养护龄期的 pH 值和 EC 值。研究了 pH 值和 EC 值对塑性混凝土强度和渗透性的影响，并从塑性混凝土的产物类型和水化反应程度探讨了其内在原因。进一步建立了 pH 值和 EC 值与塑性混凝土强度和水力传导率的定量关系。随着水泥含量的增加，塑性混凝土的强度、pH 值和 EC 值不断增加，而水力传导率则降低。随着养护龄期的增加，强度增加，水力传导率降低，而 pH 值和 EC 值则表现出先增加后减少的趋势。pH 值和电导率可以反映塑性混凝土的产物类型和水化反应程度，进一步影响其强度和水力传导率。在不同剂量和养护龄期条件下，pH 值呈现出三个阶段，即 11.7-12.27、12.27-2.5 和 12.5-12.75，在每个阶段，EC 值与强度和水力传导率之间都存在良好的幂函数关系。
