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Effect of borax on hydration and hardening properties of magnesium and pottassium phosphate cement pastes

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Abstract

Magnesium and potassium phosphate cement (MKPC) sample were prepared by mixing dead burnt MgO powder, potassium phosphate and different dosages of retarder borax to investigate the effect of borax on its hydration and hardening characteristics. The pH value, fluidity, hydration temperature and strength development of MKPC paste were investigated, and the mineralogical composition and microstructural morphology of its hydration products were analyzed. The experimental results indicated that, within a certain dosage, borax caused an endothermal effect for MKPC paste, which decreased the early hydration rate of MKPC paste, increased the fluidity of MKPC paste. Thus, strength and micro-morphology of hardened MKPC are affected. It can be concluded that borax in MKPC paste retards the early hydration rate of MKPC paste by forming a film onto surface of MgO, decreasing the temperature and increasing the pH value of the system. As borax dosage varying, different factors may dorminate the effects.

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Authors and Affiliations

  1. Institute of Materials Science and Engineering, South East University, Nanjing, 210096, China

    Jianming Yang  (杨建明) & Chunxiang Qian  (钱春香)

  2. Institute of Civil Engineering, Yancheng Institute of Technology, Yancheng, 224051, China

    Jianming Yang  (杨建明)

  3. Jiangsu Important Laboratry in Civil Engineering material, Nanjing, 210096, China

    Chunxiang Qian  (钱春香)

Authors
  1. Jianming Yang  (杨建明)
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  2. Chunxiang Qian  (钱春香)
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Correspondence to Chunxiang Qian  (钱春香).

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Yang, J., Qian, C. Effect of borax on hydration and hardening properties of magnesium and pottassium phosphate cement pastes. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 25, 613–618 (2010). https://doi.org/10.1007/s11595-010-0055-6

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  • DOI: https://doi.org/10.1007/s11595-010-0055-6

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