Open AccessHydration Model and Evaluation of the Properties of Calcined Hwangtoh Binary Blends
Author(s) -
Han-Seung Lee,
Xiao-Yong Wang
Publication year - 2021
Publication title -
international journal of concrete structures and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.758
H-Index - 29
eISSN - 2234-1315
pISSN - 1976-0485
DOI - 10.1186/s40069-020-00438-5
Subject(s) - pozzolanic reaction , carbonation , materials science , calcination , cement , hydration reaction , pozzolan , calcium hydroxide , metakaolin , compressive strength , durability , chemical engineering , chemical reaction , composite material , portland cement , chemistry , organic chemistry , catalysis , engineering
Calcined hwangtoh is a pozzolanic material that is increasingly being used as a mineral admixture in the concrete industry. This study shows a hydration model for cement–hwangtoh blends and evaluates the various properties of hwangtoh-blended concrete using reaction degrees of binders. First, a kinetic reaction model is proposed for analyzing the pozzolanic reaction of hwangtoh. The reaction of hwangtoh includes three processes: the initial dormant period, boundary reaction process, and diffusion process. The mutual interactions between the binary reactions of cement and hwangtoh are thought to be in line with the items in capillary water and calcium hydroxide. Second, the reaction degrees of cement and hwangtoh are determined based on a blended hydration model. Furthermore, the chemical (chemically combined water and calcium hydroxide contents), mechanical (compressive strength), thermal (hydration heat), and durability aspects (carbonation depth) of hwangtoh-blended concrete are systematically predicted. The results show good agreement with experimental results.