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Calcium carbide residue: Alkaline activator for clay-fly ash geopolymer

机译:碳化钙残留物:用于粘土-粉煤灰地质聚合物的碱性活化剂

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摘要

Calcium Carbide Residue (CCR) and Fly Ash (FA) are waste by-products from acetylene gas and power plant production, respectively. The liquid alkaline activator studied in this research is a mixture of sodium silicate solution (Na_2SiO_3), water and CCR. The primary aim of this research is to investigate the viability of using CCR, a cementitious waste material, as an alkaline activator and FA as a precursor to improve the engineering properties of a problematic silty clay to facilitate its usage as stabilized sub-grade material. The influential factors studied are Na_2SiO_3/water ratio, FA replacement ratio, curing time, curing temperature and soaking condition for a fixed CCR content of 7%. Strength development is investigated via the unconfined compression test. Scanning Electron Microscopy (SEM) observation is used to explain the role and contribution of influential factors on strength development. CCR dissolves the silicon and aluminum in amorphous phase of FA and the Na_2SiO_3 acts as a binder. The maximum soaked strength of the clay-FA geopolymer is found at Na2SiO_3/water ratio of 0.6 and FA replacement ratio of 15%. The optimal Na_2SiO_3/water ratio is approximated from index test, which is a very practical approach. The clay-FA geopolymers with 40 ℃ curing exhibit higher strength than those with room temperature curing, indicating the possibility of using clay-FA geopolymer for pavement subgrade applications. The 7-day soaked strength at the optimal ingredient meets the strength requirement for subgrade materials specified by the local national road authority. CCR is found to be a sustainable alkaline activator for geopolymer stabilized subgrade materials, which will result in the diversion of significant quantities of this by-product from landfills.
机译:碳化钙残留物(CCR)和粉煤灰(FA)是分别来自乙炔气和电厂生产的废副产品。本研究中研究的液体碱性活化剂是硅酸钠溶液(Na_2SiO_3),水和CCR的混合物。这项研究的主要目的是研究使用水泥废料CCR作为碱性活化剂和FA作为前体的可行性,以改善有问题的粉质粘土的工程性能,以促进其用作稳定的路基材料。研究的影响因素是Na_2SiO_3 /水比,FA替代比,固化时间,固化温度和固定CCR含量为7%的均热条件。通过无边压缩试验研究强度的发展。扫描电子显微镜(SEM)观察用于解释影响因素对力量发展的作用和贡献。 CCR将FA的非晶相中的硅和铝溶解,而Na_2SiO_3作为粘合剂。在Na 2 SiO 3 /水比为0.6且FA替代比为15%时,发现粘土-FA地质聚合物的最大浸泡强度。 Na_2SiO_3 /水的最佳比值可以通过指数测试得出,这是一种非常实用的方法。 40℃固化的粘土-FA地质聚合物比室温固化的具有更高的强度,这表明将粘土-FA地质聚合物用于路面路基的可能性。最佳成分的7天浸泡强度符合当地国家道路管理局指定的路基材料强度要求。发现CCR是稳定的地聚合物用于路基材料的碱性活化剂,这将导致大量此类副产物从垃圾填埋场转移。

著录项

  • 来源
    《Construction and Building Materials》 |2014年第30期|285-294|共10页
  • 作者单位

    School of Civil Engineering, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;

    School of Civil Engineering, Suranaree University of Technology, Thailand and CSI Distinguished Geotechnical Fellow, Swinburne University of Technology, Australia,School of Civil Engineering, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;

    School of Civil Engineering, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;

    School of Civil Engineering, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;

    Swinburne University of Technology, Melbourne, Australia;

    Swinburne University of Technology, Melbourne, Australia;

  • 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

    Geopolymer; Strength; Microstructure; Subgrade; Fly ash; Calcium carbide residue;

    机译:地聚合物强度;微观结构路基;粉煤灰;电石渣;

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