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Heat‐cured concrete: Improving the early strength and pore structure by activating aluminosilicate internal curing agent with triisopropanolamine
Author(s) -
Liu Chen,
Liu Yunpeng,
Liu Zhichao,
Hu Chuanlin,
Huang Xiao,
Yang Lu,
Wang Fazhou
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16458
Subject(s) - aluminosilicate , curing (chemistry) , materials science , microstructure , compressive strength , cement , composite material , chemical engineering , chemistry , organic chemistry , catalysis , engineering
Abstract Although heat‐cured concrete (HCC) has received extensive research interests in recent years, it still suffers from problems including coarsened microstructure, low cement hydration degrees, etc, which limited its application. Some of these problems can be solved by internal curing method resulting in low early strength of HCC and low‐production efficiency. This study addressed this issue by activating the aluminosilicate internal curing agent (lightweight fine aggregate, LWFA) with triisopropanolamine (TIPA). The results indicated that more Al 3+ and Fe 3+ ions were dissolved from LWFA by TIPA, which assisted the formation of hydrates with cement ions in interfacial transition zone (ITZ), and enhanced the density of ITZ in the early stage. The introduction of TIPA was found to increase the early compressive strength of HCC, by approximately 15.3%, 25.9% and 28.0%, respectively for the cement cured for 1, 3, and 7 days compared with control samples. Moreover, the results of rapid chloride migration and water absorption depth also suggested that coupling the aluminosilicate internal curing agent with TIPA improved the pore structure of HCC.