Title:
Effects of Ternary Cements with Limestone Filler on DEF in Concrete
Author(s):
Yasser Amine, Nordine Leklou, Ouali Amiri
Publication:
Symposium Paper
Volume:
320
Issue:
Appears on pages(s):
20.1-20.14
Keywords:
concrete, delayed ettringite formation, expansion, heat curing, limestone filler, mineral admixtures, ternary blend
DOI:
10.14359/51701058
Date:
8/1/2017
Abstract:
In this study, the effect of limestone filler in addition to other mineral admixtures on the expansion of concrete caused by internal sulfate attack was investigated. For this purpose, three different admixtures (fly ash, metakaolin and natural pozzolan) were incorporated in heat-cured concretes for a total cement replacement ratio of 25%. Tests of length changes, compressive strength, dynamic modulus of elasticity, and apparent porosity were carried out on these concretes over a period of 650 days. Additionally, microcalorimetry tests on cement pastes
with w/cm ratio equal to 0.35 were conducted. Furthermore, thermogravimetric analysis was conducted to identify
the phases formed due to the limestone filler. The results obtained were analyzed and highlighted the correlation
between the microstructural and mechanical properties of the heat-cured concretes and their expansion. The important role of limestone filler in ternary formulations and the inhibitory effect of admixtures (fly ash and metakaolin) on DEF was also highlighted.
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