Effect of fine aggregate replacement with expanded perlite and pumice on the development of lightweight concrete

IF 1.6 Q3 ENGINEERING, CIVIL Australian Journal of Civil Engineering Pub Date : 2021-05-24 DOI:10.1080/14488353.2021.1930635
Bharvi Sharma, Raju Sharma, P. Bansal
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引用次数: 3

Abstract

ABSTRACT In the present study, an attempt has been made to produce lightweight concrete (LWC) by replacing fine aggregates with expanded perlite and pumice. The first set of LWC is prepared by replacing the fine aggregates with expanded perlite at varying proportions, i.e. 0%, 25%, 50%, and 100%. The second set of the mix is prepared to study the effect of replacement of natural sand with equal proportionality of dual particles (expanded perlite and pumice). The replacement of fine aggregate with lightweight aggregates (expanded perlite and pumice) efficiently developed the LWC based on the density specified by Eurocode 2 Part 1–1 (density < 2200 kg/m3). The incorporation of expanded perlite efficiently brought down the density of developed LWC lower than 2200 kg/m3. However, the density of the mix prepared using expanded perlite and pumice exhibited slightly greater than the density of only expanded perlite contained LWC. The incorporation of pumice in the LWC imparts the pozzolanic reactivity and shows better strength and durability properties than the only expanded perlite contained LWC. Furthermore, the microstructure properties revealed that the presence of porous lightweight material unable to improve the interfacial transition zone (ITZ) compared to conventional concrete.
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膨胀珍珠岩和浮石替代细骨料对轻量化混凝土发展的影响
摘要本研究试图用膨胀珍珠岩和浮石代替细骨料生产轻质混凝土。第一套LWC是通过用不同比例的膨胀珍珠岩代替细骨料来制备的,即0%、25%、50%和100%。制备第二组混合物是为了研究在双颗粒(膨胀珍珠岩和浮石)比例相等的情况下更换天然砂的效果。用轻质骨料(膨胀珍珠岩和浮石)代替细骨料有效地开发了基于欧洲规范2第1部分规定的密度(密度<2200 kg/m3)的LWC。膨胀珍珠岩的掺入有效地将开发的LWC的密度降低到2200 kg/m3以下。然而,使用膨胀珍珠岩和浮石制备的混合物的密度略大于仅含有LWC的膨胀珍珠岩的密度。在LWC中掺入浮石赋予了火山灰反应性,并显示出比仅含膨胀珍珠岩的LWC更好的强度和耐久性。此外,微观结构性能表明,与传统混凝土相比,多孔轻质材料的存在无法改善界面过渡区(ITZ)。
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来源期刊
CiteScore
3.90
自引率
7.70%
发文量
31
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