文献类型：期刊文献

英文题名：Multi-scale characteristics of magnesium potassium phosphate cement modified by metakaolin

作者：He, Zhi-hai[1,2];Zhu, Hao-nan[1,2];Shi, Jin-yan[3,4];Li, Jing[5];Yuan, Qiang[4];Ma, Cong[6]

机构：[1]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[2]Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[3]Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China;[4]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[5]Zhejiang Yongjian New Mat Technol Co Ltd, Shaoxing 312000, Peoples R China;[6]Shenzhen Univ, Inst Urban Smart Transportat & Safety Maintenance, Shenzhen 518061, Guangdong, Peoples R China

年份：2022

卷号：48

期号：9

起止页码：12467

外文期刊名：CERAMICS INTERNATIONAL

收录：SCI-EXPANDED(收录号：WOS:000783668200003)、、EI(收录号：20220411516354)、Scopus(收录号：2-s2.0-85123258153)、WOS

基金：Acknowledgement The authors would like to acknowledge the National Key R&D Pro-gram of China (2021YFB2601005) , Natural Science Foundation of Zhejiang Province (Grant No. LY20E020006) , the International Scien-tific and Technological Cooperation Project of Shaoxing University (Grant No. 2019LGGH1009) , National Natural Science Foundation of China (Grant No. 51602198) , and Science and Technology R & D Project of Zhejiang Yongjian New Material Technology Co., Ltd (Grant No. RD202008) for their financial support to the work present in this paper.

语种：英文

外文关键词：Metakaolin; Magnesium potassium phosphate cement; Workability; Early-ages strength; Nano-scale characteristics; Volume stability

外文摘要：Workability and early-ages mechanical properties are important indicators of magnesium potassium phosphate cement (MKPC) as a repair material. The effect of metakaolin (MK) on the setting time, fluidity and early-ages strength of MKPC paste was studied, and its influence mechanism was analyzed through pore structure, microstructure and nanomechanical properties. The results show that 10% and 20% of MK prolong the setting time of MKPC paste, but excessive MK shortens the setting time of MKPC paste. Meanwhile, incorporating MK reduces the fluidity of MKPC paste, and the early-ages strength of MKPC specimens increases when the substitution ratio of MK is 10%. When 10% of MK is incorporated to the MKPC paste, the 30-d shrinkage of the sample is only 69% of the control group. Meanwhile, a proper amount of MK can improve the pore structure of the MKPC specimen and make its microstructure denser by generating amorphous aluminosilicate phosphate gel. It is observed from the nano-scale characteristics that incorporating 10% MK can reduce the content of pore phase and unreacted MgO phase, and increase the volume fraction of hydration products.