Non-expansive delayed ettringite formation in low sulphate and low alkali cement mortars

IF 1.6 Q3 ENGINEERING, CIVIL Australian Journal of Civil Engineering Pub Date : 2022-05-10 DOI:10.1080/14488353.2022.2075077
Y. K. Ramu, P. Thomas, V. Sirivivatnanon, K. Vessalas
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引用次数: 1

Abstract

ABSTRACT This paper identifies the critical cement parameters that cause expansive delayed ettringite formation (DEF) and compares them with Australian cement standards and specifications. The comparison shows that general-purpose (GP) cements adhering to Standards Australia and specifications stipulating low sulphate, alkali contents may not be prone to expansive DEF. However, there is a lack of experimental evidence supporting the low risk of Australian cements for expansive DEF. Hence, in this study, the susceptibility of Australian GP cements to expansive DEF under different heat curing temperatures up to 90°C have been studied. Further, these cements have been chemically modified to simulate the characteristics of cements used where deleterious DEF is observed in field cases. The testing protocol included long-term mortar expansion studies supported by phase and microstructural analyses. The results indicate that mortars containing Australian GP cements do not exhibit DEF expansion. Furthermore, increasing the cement sulphate content to 4% or alkali content to 1% did not result in DEF expansion. However, for cements where both the sulphate and alkali contents were increased to 4% and 1%, respectively, mortars generated significant expansion associated with ettringite precipitation. Overall, the results obtained from this study indicate that GP cements complying with Standards Australia and specifications for sulphate and alkali limits are not susceptible to expansive DEF.
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低硫酸盐低碱水泥砂浆中非膨胀延迟钙矾石的形成
本文确定了导致膨胀延迟钙矾石形成(DEF)的关键水泥参数,并将其与澳大利亚水泥标准和规范进行了比较。比较表明,符合澳大利亚标准和规范规定的低硫酸盐、低碱含量的通用(GP)水泥可能不容易发生膨胀性DEF。然而,缺乏实验证据支持澳大利亚水泥发生膨胀性DEF的风险较低。因此,本研究研究了澳大利亚GP水泥在高达90°C的不同热固化温度下对膨胀性DEF的敏感性。此外,这些水泥经过化学改性,以模拟在现场观察到有害DEF的水泥的特性。测试方案包括长期的砂浆膨胀研究,由相和微观结构分析支持。结果表明,含有澳大利亚GP水泥的砂浆不表现出DEF膨胀。此外,将水泥硫酸盐含量增加到4%或碱含量增加到1%不会导致DEF膨胀。然而,当硫酸盐和碱含量分别增加到4%和1%时,砂浆会产生显著的膨胀,并伴有钙矾石的沉淀。总的来说,这项研究的结果表明,符合澳大利亚标准和硫酸盐和碱限制规范的GP水泥不容易受到膨胀DEF的影响。
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CiteScore
3.90
自引率
7.70%
发文量
31
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