文献类型：期刊文献

英文题名：Effect of silica fume on the performance of high-early-strength UHPC prepared with magnesium ammonium phosphate cement

作者：He, Zhi-hai[1,2];Jiang, Yuan-yuan[1];Shi, Jin-yan[3];Qin, Jihui[4];Liu, De-e[5];Yalcinkaya, Caglar[6];He, Yi-feng[1,7]

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]Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China;[4]Missouri Univ Sci & Technol, Dept Civil Architectural & Environm Engn, Rolla, MO 65401 USA;[5]Tianjin Chengjian Univ, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China;[6]Dokuz Eylul Univ, Dept Civil Engn, Izmir, Turkiye;[7]Bur Ecol & Environm Shaoxing City, Shaoxing 312000, Peoples R China

年份：2024

卷号：20

外文期刊名：CASE STUDIES IN CONSTRUCTION MATERIALS

收录：SCI-EXPANDED(收录号：WOS:001252073300001)、、EI(收录号：20242316219318)、Scopus(收录号：2-s2.0-85195170375)、WOS

基金：Funding This work was supported by Natural Science Foundation of Zhejiang Province (Grant No. LY20E020006) .

语种：英文

外文关键词：Ultra -high performance concrete; Magnesium ammonium phosphate cement; Silica fume; Strength; Microstructure

外文摘要：Although ultra-high performance concrete (UHPC) prepared from Portland cement has high longterm strength and durability, its early strength development is still can be enhanced for shortening the prefabrication period or using it as a rapid repair material. Therefore, magnesium ammonium phosphate cement ultra-high performance concrete (MAPC-UHPC) was prepared using magnesium ammonium phosphate cement (MAPC), sand, steel fiber, and silica fume (SF) in this study. The effects of replacing MAPC with SF (5%-15%) on the fluidity, strength, and microstructure of MAPC-UHPC were studied. The results showed that the spread diameter of the MAPC-UHPC mixture was greater than 200 mm, and the setting time was between 5.5 and 8.5 min. Meanwhile, the 6-h compressive strength of MAPC-UHPC was higher than 100 MPa and could reach about 140 MPa in 28 d. When the 5%-15% binder was replaced by SF, the MAPCUHPC fluidity and setting time increased with the increase in SF content. When 5% SF was used, the 6-h and 28-d compressive strengths of MAPC-UHPC increased by 3.91% and 3.86%, respectively, compared with the plain sample. The addition of SF promoted the formation of struvite and refined the pore structure, which also increased the compactness of the microstructure.