硅酸盐水泥砂浆中常规细骨料和建筑拆迁废骨料粒径分布的影响

Q3 Materials Science

Cerâmica Pub Date : 2021-09-01 DOI:10.1590/0366-69132021673833035

P. Kruger, P. Serbai, A. Chinelatto, E. Pereira

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引用次数: 1

摘要

再生骨料具有不同的矿物组成，这些颗粒在其粒度分布上的级配会影响骨料的性质及其形成的复合材料的性质。本研究提出了对两种不同来源的细骨料粒度分布的影响进行比较研究，即：，天然碎石和建筑和拆除废物（CDW）。定义了三种粒度分布，使每种骨料的细度模量（FM）在粒度范围内排名，遵循NBR 7211巴西标准。进行了以下测试：稠度、新鲜状态下的堆积密度、抗压强度、吸收（通过浸渍和毛细管作用）、尺寸和质量变化。结果表明，骨料的矿物成分影响砂浆的性能，当与粒度分布一起分析时，CDW表现出不同和变化的行为，作为其粒度和分布的函数。另一项发现是，用粒度低于较低最佳区域（FM<2.20）的CDW骨料生产的砂浆的机械和物理性能降低。因此，就细骨料粒度组成而言，CDW骨料不应包含在与传统骨料相同的标准中。

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Influence of particle size distribution of conventional fine aggregate and construction demolition waste aggregate in Portland cement mortar

Recycled aggregates present a varied mineralogical composition and the grading of these particulates over their particle size distribution influence the aggregate properties as well as those of the composites that they form. This study proposed a comparative investigation of the influence of the particle size distribution of fine aggregates from two different origins, namely, natural crushed stone and construction and demolition waste (CDW). Three particle size distributions were defined, so that each aggregate had its fineness modulus (FM) ranked in the granulometric ranges, following the NBR 7211 Brazilian standard. The following tests were carried out: consistency, bulk density in the fresh state, compression strength, absorption (by immersion and capillarity), dimensional and mass variation. The results showed that the aggregate mineralogical composition impacted the mortar properties and that, when analyzed along with the particle size distribution, CDW showed different and varied behavior as a function of its particle size and distribution. Another finding was that mortars produced with CDW aggregate with granulometry below the lower optimal zone (FM<2.20) presented reduced mechanical and physical performance. Therefore, it was concluded that CDW aggregates should not be included in the same standards as conventional aggregates regarding the fine aggregate granulometric composition.

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来源期刊

Cerâmica Materials Science-Ceramics and Composites

CiteScore

1.90

自引率

0.00%

发文量

审稿时长

10 weeks

期刊介绍： A Revista Cerâmica, órgão oficial da Associação Brasileira de Cerâmica (ABCERAM) publica contribuições originais de interesse na área de cerâmica, compreendendo arte cerâmica, abrasivos, biocerâmicas, cerâmicas avançadas, cerâmica branca, cerâmica de mesa, cerâmica eletroeletrônica, cerâmica estrutural, cerâmica magnética, cerâmica nuclear, cerâmica óptica, cerâmica química, cerâmica termomecânica, cerâmica vermelha, cimento, compósitos de matriz cerâmica, materiais refratários, materiais de revestimento, matérias-primas, vidrados, vidros e vitrocerâmicas, análise microestrutural, ciência básica, instrumentação, processos de fabricação, síntese de pós, técnicas de caracterização etc.