无水乙酸钠对磷酸钾镁水泥水化性能和微观形貌的影响

doi:10.11896/cldb.19030122

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Abstract The practical applications of potassium potassium phosphate cement (MKPC) are restricted by its rapid setting and hardening and concentrative hydration heat. It is difficult for the conventional retarders to significantly reduce the hydration rate and balance the effects of retarders on setting time and mechanical properties. Effects of sodium acetate anhydrous (SA) on hydration heat release characteristics, working perfor-mance and compressive strength were investigated. Moreover, effects of SA on solid phase components and morphology of hydration products and its mechanism were analyzed by XRD, TG-DSC and SEM. The results indicated that SA inhibited the dissolution of Mg²⁺ by adsorbing on the surface of MgO. It delayed the hydration rate of MgO and KH₂PO₄, and lowered the hydration temperature. Thus, as the content of SA increased, the setting time of MKPC was effectively prolonged, while the strength, especially the early strength, decreased. The main hydration products of MKPC with SA were MgKPO₄·6H₂O, but the quantity of products was reduced. With the increasing content of SA, prismatic or plate crystals were replaced by spherical crystals, and crystal grain size reduced.

Key words： potassium magnesium phosphate cement exothermic properties hydration rate hydration products micro-morphology adsorption

Published: 12 March 2020

CLC number:

TB331

Fund:This work was financially supported by the SEU-OVM Joint Research Center for Prestressed Engineering Technology.

About author:: Jun Daiis majoring in materials science and enginee-ring in Southeast University since September 2016. She is focusing on the research of retarders of magnesium phosphate cement and magnesium phosphate cement mortar; Chunxiang Qian, professor of Southeast University and director of Green Building Materials Research Institute of Southeast University, is mainly engaged in the research of high performance concrete and microbial intelligent concrete, microbial cement and other low-carbon cementitious materials, green energy-saving buil-ding materials.

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	DAI Jun
	QIAN Chunxiang
	CHEN Jing
	PANG Zhonghua

Cite this article:

DAI Jun,QIAN Chunxiang,CHEN Jing, et al. Effect of Sodium Acetate Anhydrous on Hydration and Microstructure of Potassium Magnesium Phosphate Cement[J]. Materials Reports, 2020, 34(6): 6066-6074.

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http://www.mater-rep.com/EN/10.11896/cldb.19030122 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6066

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