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Strength development in clay-fly ash geopolymer

机译：粉煤灰土聚合物的强度发展

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摘要

This paper presents the role of influential factors on the strength development in a clay-fly ash geopolymer that a silty clay is used as fine aggregates and fly ash, FA is used as a pozzolanic material. A liquid alkaline activator, L is a mixture of sodium silicate solution (Na_2SiO_3) and sodium hydroxide solution (NaOH). The studied influential factors are Na_2SiO_3/Na0H ratio, L/FA ratio and heat conditions. The optimum ingredient for the clay-FA geopolymer is the Na_2SiO_3/NaOH ratio of 0.7 and the L/FA ratio of 0.6. The Na_2SiO_3/Na0H ratio required for the clay-FA geopolymer is less than that of the FA geopolymer because the clay has high cation absorption ability and then absorbs some of the input NaOH. For a given Na_2SiO_3/Na0H content, the strength increases with increasing the liquid alkaline activator. The excess input alkaline activator causes the precipitation at very early stage before the condensation process in geopolymerization and results in the cracks on the FA particles. The overheating (very high temperature) and excess heat duration cause the micro-cracks on the specimens. The relationship between the strength and heat energy is proposed to integrate the role of heat temperature and duration on the geopolymerization. The compressive strength increases with increasing heat energy up to a certain level. Beyond this level, the specimens shrink and crack due to the reduction in pore fluid, which results in the strength reduction. The relationship between strength and heat energy can be used as fundamental for further study on the strength development and the mix design method for the clay-FA geopolymer with different specimen dimensions, clay minerals, liquid alkaline activators, pozzolanic materials and clay:FA ratios.
机译：本文介绍了在粉煤灰土聚合物中强度影响因素的作用，其中粉质粘土用作细骨料，粉煤灰，FA用作火山灰材料。液态碱性活化剂L是硅酸钠溶液（Na_2SiO_3）和氢氧化钠溶液（NaOH）的混合物。研究的影响因素为Na_2SiO_3 / NaOH比，L / FA比和加热条件。粘土-FA地质聚合物的最佳成分是Na_2SiO_3 / NaOH比为0.7，L / FA比为0.6。粘土-FA地质聚合物所需的Na_2SiO_3 / NaOH比小于FA地质聚合物所需的Na_2SiO_3 / NaOH之比，因为该粘土具有较高的阳离子吸收能力，然后吸收一些输入的NaOH。对于给定的Na_2SiO_3 / NaOH含量，强度随液体碱性活化剂的增加而增加。过量的输入碱性活化剂会在地聚前的缩合过程之前的很早的阶段引起沉淀，并导致FA颗粒破裂。过热（非常高的温度）和过长的加热时间会导致样品出现微裂纹。提出了强度与热能之间的关系，以综合考虑温度和持续时间对地质聚合的作用。随着热能增加到一定水平，抗压强度增加。超过该水平，由于孔隙流体的减少，样品收缩和破裂，从而导致强度降低。强度与热能之间的关系可作为进一步研究不同尺寸，黏土矿物，液态碱性活化剂，火山灰材料和黏土：FA比的黏土-FA地质聚合物的强度发展和混合设计方法的基础。

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  • 来源
    《Construction and Building Materials》 |2013年第3期|566-574|共9页
  • 作者

    Patimapon Sukmak; Suksun Horpibulsuk; Shui-Long Shen;

  • 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, 111 University Avenue, Muang District, Nakhon Ratchasima 30000, Thailand;

    Department of Civil Engineering, Shanghai Jiao Tong University and State Key Laboratory of Ocean Engineering, 800 Dongchuang Rd., Shanghai 200240, 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

    geopolymer brick; strength; microstructure; silty clay; fly ash;

    机译：地聚合物砖;强度;微观结构粉质粘土粉煤灰;

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