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Phosphate Bonding: a New Method for Using Large Volume of Fly Ash

机译：磷酸盐粘结：一种使用大量粉煤灰的新方法

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摘要

Magnesium phosphate cements (MPC) with larger volume of fly ash were studied in the present work. Dead burned magnesia, phosphates and fly ash were the components of MPC. The volume of fly ash in MPC was 70%, 75% and 80%, respectively. Three phosphates, monosodium phosphate (MSP), monopotassium phosphate (MPP) and monoammonium phosphate (MAP) were used. Compressive strength of the three MPC mortars with different fly ash content was determined. Results show that the compressive strength reduced with the proportion increase of fly ash, increased with the curing time. After cured 28 days in the lab air, the compressive strength of cement mortar can reach 14MPa, when the fly ash dosage was 80% by weight of cement. The reaction product is struvite of potassium (KMgPO_4·6H_2O) in potassium phosphate based MPC, and hydrated sodium phosphate (Na_2HPO_4·17H_2O) in sodium phosphate based MPC. The results indicate that MPC has capacity to bond large volume of fly ash. A new way to utilize fly ash in a large scale can be realized by phosphate bonding.
机译：在目前的工作中，研究了粉煤灰量更大的磷酸镁水泥（MPC）。死燃烧的氧化镁，磷酸盐和粉煤灰是MPC的成分。 MPC中的粉煤灰体积分别为70％，75％和80％。使用了三种磷酸盐：磷酸一钠（MSP），磷酸一钾（MPP）和磷酸一铵（MAP）。确定了三种具有不同粉煤灰含量的MPC砂浆的抗压强度。结果表明，抗压强度随粉煤灰比例的增加而降低，随固化时间的增加而增加。在粉煤灰用量为水泥重量的80％时，在实验室空气中固化28天后，水泥砂浆的抗压强度可达到14MPa。反应产物是磷酸钾基MPC中的钾盐鸟粪石（KMgPO_4·6H_2O）和磷酸钠基MPC中的水合磷酸钠（Na_2HPO_4·17H_2O）。结果表明，MPC具有粘结大量粉煤灰的能力。通过磷酸盐键合可以实现大规模利用粉煤灰的新方法。

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  • 来源
  • 会议地点 Shanghai(CN)
  • 作者

    Zhu Ding; Ming Zhang; Biqin Dong; Wei Liu; Han Lu;

  • 作者单位

    School of Civil Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Ecological Technology Institute of Construction Engineering, Shenzhen University. Shenzhen 518060, China;

    School of Civil Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Ecological Technology Institute of Construction Engineering, Shenzhen University. Shenzhen 518060, China;

    School of Civil Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Ecological Technology Institute of Construction Engineering, Shenzhen University. Shenzhen 518060, China;

    School of Civil Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Ecological Technology Institute of Construction Engineering, Shenzhen University. Shenzhen 518060, China;

    School of Civil Engineering, Guangdong Province Key Laboratory of Durability for Marine Civil Engineering, Ecological Technology Institute of Construction Engineering, Shenzhen University. Shenzhen 518060, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Cement; Fly ash; Phosphate Bonding; Compressive strength;

    机译：水泥;粉煤灰；磷酸盐键合；抗压强度;

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