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Investigate the influence of expanded clay aggregate and silica fume on the properties of lightweight concrete

机译：探讨膨胀粘土骨料和二氧化硅烟气对轻质混凝土性能的影响

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摘要

This study concentrated on the formulation of self-flowing and an energy efficient lightweight aggregate foamed concrete (LAFC) to be employed as thermal insulation, thermal mass and structural material. Low density concrete mixtures (for the density values from 800 to 1300 kg/m(3)) were prepared by changing the volume of lightweight expanded clay aggregate (ECA) from 49.4% to 20.1%. Flowing properties of concrete mixtures were improved with the help of stable foam. Ordinary Portland cement (OPC) was replaced by the 5% and 10% silica fume (SF) to examine the influence of SF on the properties of LAFC Compressive strength and tensile strength of LAFC mixtures were respectively enhanced from 6.5 MPa to 24.30 MPa and 0.52 MPa to 1.63 MPa by reducing the volume of ECA from 49.4% to 20.1%. LAFC mixture (800-0SF) with the lowest density exhibited highest porosity and sorption coefficient value of 70.63% and 2.56 kg m(-2) min(-0.5). Thermal conductivity, volumetric specific heat capacity and thermal diffusivity of LAFC mixtures were in the range of 0.23-0.45 W m(-1) K-1, 1136-1631 kJ/m(3).K and 0.20-0.275 mm(2)/s respectively. SEM analysis revealed that reduction in the volume of ECA and addition of SF densified the microstructure of LAFC. Finally, LAFC mixtures were classified into Class-I, Class-II and Class-III grade concretes for the structure and insulation purposes as per functional classification of RILEM. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本研究集中在自流式的配方上，并将节能轻质聚集体发泡混凝土（LAFC）铸造为绝热，热质量和结构材料。通过将轻质膨胀粘土聚集体（ECA）的体积从49.4％改变为20.1％，制备低密度混凝土混合物（对于800至1300kg / m（3））制备。稳定泡沫的帮助改善了混凝土混合物的流动性质。普通波特兰水泥（OPC）被5％和10％二氧化硅烟灰（SF）取代，以检查SF对LAFC抗压强度的性能的影响，LAFC混合物的拉伸强度分别从6.5 MPa增强至24.30MPa和0.52通过将ECA的体积从49.4％减少至20.1％，MPA至1.63 MPa。 LAFC混合物（800-0SF）具有最低密度的孔隙率最高，吸附系数为70.63％和2.56kg m（-2）min（-0.5）。 LAFC混合物的导热系数，体积比热容和热扩散率为0.23-0.45Wm（-1）k-1,1136-1631kJ / m（3）.k和0.20-0.275 mm（2） / s分别。 SEM分析表明，ECA的体积减少和SF的添加致密于LAFC的微观结构。最后，将LAFC混合物分为I类，II类和III级等级混凝土，用于根据RILEM的功能分类，为结构和绝缘材料。 （c）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2019年第30期|253-266|共14页
  • 作者

    Ahmad Muhammad Riaz; Chen Bing; Shah Syed Farasat Ali;

  • 作者单位

    Shanghai Jiao Tong Univ State Key Lab Ocean Engn Shanghai 200240 Peoples R China|Shanghai Jiao Tong Univ Dept Civil Engn Shanghai 200240 Peoples R China|Muhammad Nawaz Sharif Univ Engn & Technol Dept Civil Engn Multan 60000 Pakistan;

    Shanghai Jiao Tong Univ State Key Lab Ocean Engn Shanghai 200240 Peoples R China|Shanghai Jiao Tong Univ Dept Civil Engn Shanghai 200240 Peoples R China;

    Shanghai Jiao Tong Univ State Key Lab Ocean Engn Shanghai 200240 Peoples R China|Shanghai Jiao Tong Univ Dept Civil Engn Shanghai 200240 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Foamed concrete; Expanded clay aggregate; Porosity; Sorptivity; Thermal conductivity;

    机译：泡沫混凝土;膨胀粘土骨料;孔隙度;吸附性;导热率;

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