葡萄糖酸钠对硅磷酸钾镁水泥基本性能的影响

doi:10.11896/cldb.23080008

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Abstract Magnesium silicon potassium phosphate cement (MSPPC) is an innovative high-performance magnesium phosphate cement, which is different from ordinary magnesium potassium phosphate cement (MKPC) using acidic potassium dihydrogen phosphate. Its necessary raw materials include basic dipotassium hydrogen phosphate, magnesium oxide and silica fume. MKPC is difficult to prepare without retarder, while MSPPC can be prepared without retarder due to its long setting time. After hardening, MSPPC has better mechanical properties than MKPC, but its working performance has not been able to meet the needs of practical engineering applications. The setting time and fluidity can be adjusted by the amount of retarder. Borax is a commonly used retarder for magnesium phosphate cement, but its potential toxicity problems forces the need to find a safe and effective alternative. This study investigated the influence of sodium gluconate (SG) content on the performance, compressive strength, hydration temperature, pH value, phase composition, porosity, and microstructure of MSPPC, and established a model for the retarding mechanism. The results demonstrated that a higher SG content led to a more pronounced retarding effect. At the SG dosage was 6%, the initial setting time was extended from 12 min to 30 min, and the cement paste fluidity improved from 84 mm to 142 mm. The proportion of pores larger than 0.1 μm was reduced, effectively improving pore size distribution. Although the type of hydration products did not change, there was an adverse effect on the 3 d compressive strength, from 64.3 MPa to 53.9 MPa, a decreased by 16.2%, while the 56 d compressive strength decreased by 6.99% and the adverse effect was reduced.

Key words： magnesium silicon potassium phosphate cement sodium gluconate setting time phase composition porosity

Published: 10 September 2024 Online: 2024-09-30

CLC number:

TU528

Fund:General Project of National Natural Science Foundation of China (52279126), Fujian Province Housing and Urban-Rural Construction Industry Science and Technology Research and Development Project (2022-K-180).

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	Articles by authors
	YANG Yizhe
	LIN Xujian
	XU Xiaoying
	LIN Hengzhou
	CHEN Weiyu
	YE Caifa

Cite this article:

YANG Yizhe,LIN Xujian,XU Xiaoying, et al. Effect of Sodium Gluconate on the Basic Properties of Magnesium Silicate Potassium Phosphate Cement[J]. Materials Reports, 2024, 38(17): 23080008-6.

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http://www.mater-rep.com/EN/10.11896/cldb.23080008 OR http://www.mater-rep.com/EN/Y2024/V38/I17/23080008

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