Perko Janez, Ukrainczyk Neven, Šavija Branko, Phung Quoc Tri, Koenders Eddie A B
Institute for Environment, Health and Safety, Belgian Nuclear Research Centre SCK CEN, Boeretang 200, 2400 Mol, Belgium.
Institute of Construction and Building Materials, Technical University of Darmstadt, Franziska-Braun-Str 7, 64287 Darmstadt, Germany.
Materials (Basel). 2020 Jun 13;13(12):2697. doi: 10.3390/ma13122697.
A coupled numerical approach is used to evaluate the influence of pore connectivity and microcracks on leaching kinetics in fully saturated cement paste. The unique advantage of the numerical model is the ability to construct and evaluate a material with controlled properties, which is very difficult under experimental conditions. Our analysis is based on two virtual microstructures, which are different in terms of pore connectivity but the same in terms of porosity and the amount of solid phases. Numerical fracturing was performed on these microstructures. The non-fractured and fractured microstructures were both subjected to chemical leaching. Results show that despite very different material physical properties, for example, pore connectivity and effective diffusivity, the leaching kinetics remain the same as long as the amount of soluble phases, i.e., buffering capacity, is the same. The leaching kinetics also remains the same in the presence of microcracks.
采用一种耦合数值方法来评估孔隙连通性和微裂纹对完全饱和水泥浆体中浸出动力学的影响。该数值模型的独特优势在于能够构建和评估具有可控特性的材料，而这在实验条件下非常困难。我们的分析基于两种虚拟微观结构，它们在孔隙连通性方面不同，但在孔隙率和固相量方面相同。对这些微观结构进行了数值压裂。未压裂和压裂后的微观结构均进行了化学浸出。结果表明，尽管材料的物理性质差异很大，例如孔隙连通性和有效扩散率，但只要可溶相的量（即缓冲能力）相同，浸出动力学就保持不变。在存在微裂纹的情况下，浸出动力学也保持不变。
