文献类型：期刊文献

英文题名：Multi-scale characteristics of magnesium potassium phosphate cement enhanced by waste concrete powder

作者：He, Zhi-hai[1,2];Xu, Hao[1];Huynh, Trong-Phuoc[3];Shi, Jin-yan[4];Ma, Zhi-ming[5];Hu, Yun-jin[1];Chen, Fei-jin[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]Can Tho Univ, Coll Engn, Fac Civil Engn, Campus II,3 2 St, Can Tho 94000, Vietnam;[4]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[5]Yangzhou Univ, Coll Civil Sci & Engn, Yangzhou 225127, Peoples R China;[6]Zhejiang Leibang New Bldg Mat Co Ltd, Dongyang 322100, Peoples R China

年份：2023

卷号：49

期号：10

起止页码：15480

外文期刊名：CERAMICS INTERNATIONAL

收录：SCI-EXPANDED(收录号：WOS:000971181800001)、、EI(收录号：20230613555000)、Scopus(收录号：2-s2.0-85147380293)、WOS

基金：Acknowledgement The authors would like to acknowledge the Natural Science Foun-dation of Zhejiang Province (Grant No. LY20E020006) , the International Scientific 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：Waste concrete powder; Magnesium potassium phosphate cement; Eco-friendly; Multi -scale characteristics; Nanomechanical properties

外文摘要：Using recycled concrete powder (RP) as an alternative binder can effectively reduce construction and demolition waste and contribute to developing eco-friendly repair materials. However, the effect of RP on magnesium potassium phosphate cement (MKPC) has not been sufficiently studied. In this study, MKPC pastes were prepared by replacing different contents of MgO with RP, and the evolution of the structural behavior was explained from nanoscale to microscale. The results show that incorporating an appropriate amount of RP can increase the fluidity and setting time of the MKPC mixture and improve its mechanical properties. The drying shrinkage and water resistance of MKPC specimens also improve with the increasing RP content. Incorporating an appropriate amount of RP can refine the pore structure of MKPC samples, while the generation of gel-like products can compensate for the adverse effects of reduced struvite-K content. The nanoscale characteristics of the MKPC samples also indicate that incorporating RP results in a decrease in the residual MgO and pore phase content, an increase in the content of the hydrated phase, and a decrease in the loss of the hydrated phase volume fraction due to water soaking. Upon optimizing the RP content, the MKPC mixture exhibits a lower cost and carbon footprint, with the 28-d compressive strength of the sample mixed with 10% RP increased by 7.36% relative to the plain sample, indicating that recycling RP is feasible in an eco-friendly MKPC system.