Delayed ettringite formation in fly ash concrete under moist curing conditions

Zhuqing Yu, Jian Ma, Hu Shi, Xiaodong Shen, Guang Ye

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

2 Citations (Scopus)


During the hydration of cement, tricalcium aluminate (C3A) reacts with gypsum and forms ettringite (AFt). Once all gypsum is consumed, ettringite can further react with remaining C3A and form monosulfate (AFm) at 1-2 days. Normally, at early ages, ettringite all transfers to AFm phase. After several months or years, ettringite can form again if a new source of sulfate becomes available in the pore solution of the paste, viz. delayed ettringite formation. In previous study, it was found that delayed ettringite forms in Portland cement concrete when the concrete samples were cured under moist conditions, i.e., without external sulfate phase. This delayed ettringite formation may result in the decrease of resistance of Portland cement concrete to chloride penetration. After that, it was found that ettringite, viz. delayed ettringite formation, also generated in fly ash concrete. The formation of ettringite, however, has no obvious influence on the resistance of fly ash concrete to chloride penetration.

Original languageEnglish
Title of host publicationInternational Conference on Durability of Concrete Structures, ICDCS 2016
EditorsFeng Xing, Ji-Hua Zhu, Ningxu Han
PublisherPurdue University
Number of pages3
ISBN (Print)978-1-62671-065-8
Publication statusPublished - 2016
Event5th International Conference on Durability of Concrete Structures - Shenzhen University, Shenzhen, Guangdong Province, China
Duration: 30 Jun 20161 Jul 2016
Conference number: 5


Conference5th International Conference on Durability of Concrete Structures
Abbreviated titleICDCS 2016
CityShenzhen, Guangdong Province
Internet address


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