TY - JOUR
T1 - Effect of highly dispersed colloidal olivine nano-silica on early age properties of ultra-high performance concrete
AU - Chen, Yuxuan
AU - Li, Shaojie
AU - Mezari, Brahim
AU - Hensen, Emiel J.M.
AU - Yu, Ruohan
AU - Schollbach, Katrin
AU - Brouwers, H.J.H.
AU - Yu, Qingliang
PY - 2022/8/1
Y1 - 2022/8/1
N2 - 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.
AB - 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.
KW - Colloidal silica
KW - NMR
KW - Olivine
KW - Ultra-high performance concrete
UR - http://www.scopus.com/inward/record.url?scp=85130204217&partnerID=8YFLogxK
U2 - 10.1016/j.cemconcomp.2022.104564
DO - 10.1016/j.cemconcomp.2022.104564
M3 - Article
SN - 0958-9465
VL - 131
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
M1 - 104564
ER -