Influence of wollastonite on hydration and properties of magnesium potassium phosphate cements

被引：80

作者：

Xu, Biwan ^{[1
]}

Lothenbach, Barbara ^{[1
,2
]}

Winnefeld, Frank ^{[1
]}

机构：

[1] Swiss Fed Labs Mat Sci & Technol Empa, Lab Concrete & Construct Chem, CH-8600 Dubendorf, Switzerland

[2] Norwegian Univ Sci & Technol, Dept Struct Engn, Trondheim, Norway

来源：

CEMENT AND CONCRETE RESEARCH | 2020年 / 131卷

关键词：

Magnesium potassium phosphate (MKP) cement; Wollastonite; Reactivity; Hydration; Strength; SOLID-STATE NMR; C-S-H; FLY-ASH; CALCIUM SILICATES; PORTLAND CEMENTS; RATIO; HYDROXYAPATITE; SOLUBILITY; BINDERS; PASTE;

D O I：

10.1016/j.cemconres.2020.106012

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This study investigates the effect of wollastonite on the hydration and properties of magnesium potassium phosphate (MKP) cements. In MKP cements some efflorescence can occur; the presence of wollastonite suppresses efflorescence as the formation of Mg2KH(PO4)(2)center dot 15H(2)O is prevented. The presence of wollastonite leads also to more heat (per g of MKP cement) due to the filler effect and due to the reaction of wollastonite, which increases strength, especially at low water-to-binder (w/b) ratio of 0.25 and at later ages, and lowers the pH values in the cement pore solution. The reaction of wollastonite does not lead to the formation of crystalline hydrates, both experimental and thermodynamic findings suggest the formation of amorphous hydroxyapatite and magnesium silicate hydrates (M-S-H).

引用

页数：21

共 68 条

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