文献类型：期刊文献

英文题名：Recycling of water treatment sludge into magnesium potassium phosphate cement component by a combination of silica fume

作者：Qin, Jiali[1];Zhu, Haonan[2,3];He, Zhihai[2,3];Yu, Xiaoniu[4];Shi, Jinyan[1];Lu, Jun[5];Ma, Cong[6];Cheng, Yongliang[7]

机构：[1]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[2]Shaoxing Univ, Coll Civil Engn, Shaoxing 312000, Peoples R China;[3]Key Lab Rock Mech & Geohazards Zhejiang Prov, Shaoxing 312000, Peoples R China;[4]Jiangsu Key Lab Construct Mat, Nanjing 211189, 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;[7]Baoshan Highway Engn Qual Supervis Stn, Baoshan 678000, Peoples R China

年份：2022

卷号：51

外文期刊名：JOURNAL OF BUILDING ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:000777554900002)、、EI(收录号：20221011762901)、Scopus(收录号：2-s2.0-85125764029)、WOS

基金：Acknowledgments The authors would like to acknowledge the National Key R&D Program of China (2021YFB2601005) , Natural Science Foundation 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) , Science and Technology R & D Project of Zhejiang Yongjian New Material Technology Co., Ltd (Grant No. RD202008) , and Fundamental Research Funds for the Central Universities of Central South University (Grant No. 2021zzts0770) for their financial support to the work present in this paper.

语种：英文

外文关键词：Magnesium potassium phosphate cement; Silica fume; Water treatment sludge; Early-ages strength; Micro-nano structure

外文摘要：Supplementary cementitious materials (SCMs) are often used to improve the performance of magnesium potassium phosphate cement (MKPC). The synergistic influence of silica fume (SF) and calcined water treatment sludge (CWTS) instead of partial magnesium oxide on the setting time, fluidity and early-ages compressive strength of MKPC system have been investigated. The results show that although the incorporation of CWTS reduces the fluidity and setting time of MKPC paste, the addition of SF can significantly improve the adverse effect of CWTS on workability, thereby making it meet the performance requirements as repair material. As the content of SF or CWTS increases, the compressive strength of the specimens increases first and then decreases. The optimum contents of single-doped SF and CWTS are 10% and 40%, respectively. The strength gain of composite SCMs (<= 20%) to MKPC sample is significantly higher than that of single SCM (SF or CWTS), which is attributed to the fact that composite SCMs refines the pore structure of the specimen and produces hydration products such as irregular crystalline MKP and amorphous aluminosilicate phosphate products. In the nano-scale characteristics, the pore phase of the MKPC matrix prepared by replacing MgO with an appropriate amount of CWTS (30%) is significantly reduced, while the hydration phase is relatively increased. Therefore, a new type of green low-carbon MKPC system is prepared, the sludge waste is effectively recycled, and the early-ages performance of MKPC is improved.