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

机译：研究膨胀粘土骨料和硅粉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：这项研究集中于自流动和节能的轻质骨料泡沫混凝土（LAFC）的配方，以用作隔热，热质和结构材料。通过将轻质膨胀粘土骨料（ECA）的体积从49.4％更改为20.1％，可以制备低密度混凝土混合物（密度值从800到1300 kg / m（3））。借助稳定的泡沫可以改善混凝土混合物的流动性。分别用5％和10％的硅粉（SF）代替普通的硅酸盐水泥（OPC），以检查SF对LAFC性能的影响。LAFC混合物的抗压强度和拉伸强度分别从6.5 MPa提高到24.30 MPa和0.52通过将ECA的体积从49.4％减少到20.1％，将压力降低到1.63 MPa。具有最低密度的LAFC混合物（800-0SF）表现出最高的孔隙率和70.63％的吸附系数值和2.56 kg m（-2）min（-0.5）。 LAFC混合物的热导率，体积比热容和热扩散率在0.23-0.45 W m（-1）K-1、1136-1631 kJ / m（3）.K和0.20-0.275 mm（2）的范围内/ s。 SEM分析表明，ECA体积的减少和SF的添加致密化了LAFC的微观结构。最后，根据RILEM的功能分类，出于结构和绝缘目的，LAFC混合物分为I级，II级和III级等级混凝土。 （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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