Development and characterization of magnesium phosphate cement based ultra-high performance concrete.
In: Composites: Part B, Engineering, Jg. 234 (2022-04-01), S. N.PAG
Online
academicJournal
Zugriff:
This study aims at the development of magnesium phosphate cement-based ultra-high performance concrete (MPC-UHPC). To this end, MPC paste phase was designed by using high magnesia-to-phosphate (M/P , 3.5) and low water-to-cement (W/C , 0.10–0.16) mass ratios, and certain amounts of ultra-fine fly ash (UFA, 5%–15%). Fresh and hardened properties, and microstructure of the developed MPC-UHPC were evaluated, and compared with those of conventional UHPC as well. Test results showed that lower W/C resulted in higher mechanical strengths and lower drying shrinkage, but the sharp decrease of workability and increase of autogenous shrinkage. At a constant W/C , the addition of UFA effectively improved fresh behaviors and decreased autogenous shrinkage without degrading late-age compressive strength. Due to a good plasticizing effect of UFA, the W/C could be reduced with increasing UFA content, leading in turn to continuous increase in autogenous shrinkage and strength. Compared to conventional UHPC, an optimal MPC-UHPC provided much lower shrinkage, higher early strength, and comparable 28-d strength above 120 MPa. Microstructural analyses revealed that a combination use of high M/P , low W/C and UFA as micro-filler can result in densely compacted microstructure, improved pore structure and enhanced matrix-aggregate interface, which is responsible for the superior mechanical performance of MPC-UHPC. [ABSTRACT FROM AUTHOR]
Titel: |
Development and characterization of magnesium phosphate cement based ultra-high performance concrete.
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Autor/in / Beteiligte Person: | Qin, Jihui ; Dai, Fumin ; Ma, Hongyan ; Dai, Xiaobing ; Li, Zhen ; Jia, Xingwen ; Qian, Jueshi |
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Zeitschrift: | Composites: Part B, Engineering, Jg. 234 (2022-04-01), S. N.PAG |
Veröffentlichung: | 2022 |
Medientyp: | academicJournal |
ISSN: | 1359-8368 (print) |
DOI: | 10.1016/j.compositesb.2022.109694 |
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