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Số người truy cập: 107,049,018

 Effet des cendres volantes sur la formation d’ettringite différée (DEF): Analyses mécaniques et microstructurales
Tác giả hoặc Nhóm tác giả: Nguyen V-H., Leklou N., Mounanga P.
Nơi đăng: AUGC 2013, France; Số: 31;Từ->đến trang: 1-11;Năm: 2013
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Trong nước
TÓM TẮT
Delayed Ettringite Formation (DEF) is a type of internal sulfate attack caused by heat-induced decomposition of ettringite formed during the initial hydration of cement submitted to temperatures higher than 70°C. In this paper, the effect of fly ash on the expansion of cement mortars caused by DEF was investigated. For this purpose, a portion of cement was replaced by fly ash, with three different dosages (10, 20 and 30%). The mortars were heat-cured at early-age, and tests of expansion, strength, dynamic elastic modulus, mercury porosity and thermogravimetric analysis were carried on these mortars over a period of 500 days. Additionally, scanning electron microscopy (SEM) observations were realized. The results obtained highlighted the mitigation effects of fly ash on DEF.

KEY WORDS: delayed ettringite formation, expansion, mortars, fly ash, heat curing
ABSTRACT
Delayed Ettringite Formation (DEF) is a type of internal sulfate attack caused by heat-induced decomposition of ettringite formed during the initial hydration of cement submitted to temperatures higher than 70°C. In this paper, the effect of fly ash on the expansion of cement mortars caused by DEF was investigated. For this purpose, a portion of cement was replaced by fly ash, with three different dosages (10, 20 and 30%). The mortars were heat-cured at early-age, and tests of expansion, strength, dynamic elastic modulus, mercury porosity and thermogravimetric analysis were carried on these mortars over a period of 500 days. Additionally, scanning electron microscopy (SEM) observations were realized. The results obtained highlighted the mitigation effects of fly ash on DEF.

KEY WORDS: delayed ettringite formation, expansion, mortars, fly ash, heat curing
[ 2020\2020m05d020_11_47_59Contribution1129.pdf ]
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