Effect of borax on the hydration and setting of magnesium phosphate cements

被引：33
|
作者：
Gelli, Rita [1 ,2 ]
Tonelli, Monica [1 ,2 ]
Martini, Francesca [3 ,4 ]
Calucci, Lucia [4 ,5 ]
Borsacchi, Silvia [4 ,5 ]
Ridi, Francesca [1 ,2 ]
机构：
[1] Univ Florence, Dept Chem Ugo Schiff, Via Lastruccia 3, I-50019 Florence, Italy
[2] Univ Florence, CSGI, Via Lastruccia 3, I-50019 Florence, Italy
[3] Univ Pisa, Dept Chem & Ind Chem, Via G Moruzzi 13, I-56124 Pisa, Italy
[4] Univ Pisa CISUP, Ctr Instrument Sharing, I-56126 Pisa, Italy
[5] Italian Natl Res Council CNR, Inst Chem OrganoMetall Cpds ICCOM, Via G Moruzzi 1, I-56124 Pisa, Italy
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 348卷
基金：
欧盟地平线“2020”;
关键词：
Magnesium phosphate cements; Tri-magnesium phosphate; Borax; Retarders; Setting; Kinetics; Solid state NMR; MECHANICAL-PROPERTIES; IN-VITRO; NMR; REGENERATION; MICROSTRUCTURE; MAS; RETARDATION; FABRICATION; OSTEOBLAST; NANOTUBES;
D O I：
10.1016/j.conbuildmat.2022.128686
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
This work unravels for the first time the concentration dependent retarding effect of borax on tri-magnesium phosphate-based cements by studying the hydration and the phases formed in the set cements, exploiting multiple characterization techniques. In the presence of borax, the hydration was found to be slower and less exothermic, leading to the formation of struvite without newberyite, with no effect on cement's strength. The observed boron species allowed us to ascribe the retardation to the complexation of NH4+ and Mg2+ by borate and polyborate anions.
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页数：11
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