Effect of highly dispersed colloidal olivine nano-silica on early age properties of ultra-high performance concrete

被引：36
作者：
Chen, Y. X. [1 ,2 ]
Li, S. [1 ,2 ]
Mezari, B. [3 ]
Hensen, E. J. M. [3 ]
Yu, R. [4 ]
Schollbach, K. [2 ]
Brouwers, H. J. H. [2 ,4 ]
Yu, Qingliang [1 ,2 ]
机构：
[1] Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
[2] Eindhoven Univ Technol, Dept Built Environm, POB 513, NL-5600 MB Eindhoven, Netherlands
[3] Eindhoven Univ Technol, Dept Chem Engn & Chem, POB 513, NL-5600 MB Eindhoven, Netherlands
[4] Wuhan Univ Technol, State Key Lab Silicate Mat Architectures, Wuhan 430070, Peoples R China
来源：
CEMENT & CONCRETE COMPOSITES | 2022年 / 131卷
基金：
中国国家自然科学基金;
关键词：
Colloidal silica; Ultra-high performance concrete; Olivine; NMR; CEMENT HYDRATION; PORTLAND-CEMENT; MAS NMR; NANOSILICA; PARTICLES; WASTE; AL-27; MICROSTRUCTURE; SURFACE; IMPACT;
D O I：
10.1016/j.cemconcomp.2022.104564
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Nano-silica is an important admixture for ultra-high performance concrete (UHPC). However, complex production process and agglomeration problem of conventional nano-silica significantly limit its application in UHPC. In this study, a novel highly dispersed colloidal olivine nano-silica (C-OnS) is developed. The properties of C-OnS are characterized with laser light scattering, nuclear magnetic resonance and zeta-potential. The C-OnS is applied in UHPC to enhance the cement hydration and reduce the viscosity, while a commercial sol-gel colloidal nano-silica (C-nS) is used as a reference. The effects of C-OnS and C-nS on UHPC are investigated by calorimetry, thermal gravimetry, 29Si and 27Al nuclear magnetic resonance, nitrogen physisorption and mercury intrusion porosimeter. The results show that the performance of UHPC is enhanced by C-OnS at early ages thanks to its higher silanol content, surface area and dispersibility. The advantages of highly dispersive, strong pozzolanic reactivity and tailorable particle size provide new possibilities for application of C-OnS in cement-based materials.
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页数：16
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