This work aims to evaluate the pore solution using the ex situ leaching method of a wide variety of modified concretes with mineral additions, and submitted to a natural carbonation for 14 years of exposure in a typical urban environment. The results of chemical analyses of pH, electrical conductivity, and ionic strength are thus presented, considering the carbonated and non-carbonated concrete layers. Mixtures with silica fume, metakaolin, rice husk ash, fly ash and blast furnace slag were produced, aiming to generate different chemical parameters related to the pore solution. The results showed that the decrease in ionic strength, altered mainly by the reduction in the concentration of OH⁻, explains the significant drops in pH and conductivity in carbonated concrete. In the same way, a significantly lower conductivity was observed for the concretes with mineral additions, which partially explains why these concretes have so much stronger resistivity (bulk or surface resistivity) compared to plain concretes.

这项工作旨在使用多种改性混凝土和矿物添加物的异地浸出方法评估孔隙溶液，并在典型的城市环境中暴露14年后自然碳化。考虑到碳酸盐混凝土层和非碳酸盐混凝土层，给出了pH，电导率和离子强度的化学分析结果。生产了与硅灰，偏高岭土，稻壳灰，粉煤灰和高炉矿渣的混合物，目的是产生与孔溶液有关的不同化学参数。结果表明，离子强度的降低主要是由于OH-浓度的降低而改变的^。解释了碳酸混凝土中pH和电导率的显着下降。同样，添加矿物的混凝土的电导率明显降低，这部分解释了为什么这些混凝土比普通混凝土具有更高的电阻率（体电阻或表面电阻率）。