不同混凝土中氯离子扩散规律试验研究

Experimental research on chloride ion diffusion rule of different concrete

制备了未加掺合料、单掺粉煤灰、单掺矿粉、复合掺加粉煤灰和矿粉四个类别,强度等级分别为C30、C35、C40和C50的16个配合比的混凝土试件,分别采用化学滴定法和CL-U氯离子快速测定仪法对钻取的粉末样品进行滴定比较,研究混凝土氯离子扩散规律,结果表明:相同的样品,化学滴定法测得的氯离子浓度较大,但是差值较小;仪器得到的氯离子浓度较小,但是差值较大,氯离子扩散系数也是如此。

We made 16 match ratio of concrete samples with strength grade were C30, C35, C40 and C50, which are divided into four categories that no admixture, mixed with fly ash, single mineral admixture, and composite mixed with fly ash and mineral powder, we respectively used the chemical titration and CL-U chloride ion detector method to make titration comparison of powder samples, to study the concrete chloride ion diffusion. Results show that for the same samples, the chlorine ion concentration is larger by chemical titration method, but the difference is small; the chlorine ion concentration is lower by instrument, but the difference is large, the same as the chloride diffusion coefficient.