THE EFFECT OF RANDOM AGGREGATE FIELD ON SUPERCRITICAL CARBONATION OF CONCRETE

Xiaoxiong Zha, Changchun Ren, Jiaqian Ning

Abstract: In order to study the supercritical carbonation process of concrete from the mesoscopic level, this paper is based on the theory of aggregate grading, by introducing a randomly distributed two-dimensional circular aggregate to simulate the supercritical carbonation process of concrete, the uneven carbonation boundary of concrete is obtained, and the carbonation degree of concrete is described by the maximum carbonation depth. The aggregate distribution of concrete is obtained by discussing the selection principle of the maximum particle size, the minimum particle size and the volume fraction of the aggregate; after the obtained aggregate distribution model is added to the supercritical carbonation model, the irregular boundary of concrete carbonation can be well simulated. The results show that the uneven distribution of aggregate in the cement mortar will lead to the non-uniformity of the carbonation depth of the concrete, which can be used to evaluate the effect of aggregate on the carbonation depth of the concrete.

Keywords: Supercritical carbonation, Random aggregate, Carbonation depth

DOI: https://doi.org/10.15623/ijret.2018.0708008