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Article

Effect of Nano-SiO2 on the Hydration and Microstructure of Portland Cement

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Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing 211800, China
2
Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Thomas Nann
Nanomaterials 2016, 6(12), 241; https://doi.org/10.3390/nano6120241
Received: 7 November 2016 / Revised: 4 December 2016 / Accepted: 6 December 2016 / Published: 15 December 2016
This paper systematically studied the modification of cement-based materials by nano-SiO2 particles with an average diameter of about 20 nm. In order to obtain the effect of nano-SiO2 particles on the mechanical properties, hydration, and pore structure of cement-based materials, adding 1%, 3%, and 5% content of nano-SiO2 in cement paste, respectively. The results showed that the reaction of nano-SiO2 particles with Ca(OH)2 (crystal powder) started within 1 h, and formed C–S–H gel. The reaction speed was faster after aging for three days. The mechanical properties of cement-based materials were improved with the addition of 3% nano-SiO2, and the early strength enhancement of test pieces was obvious. Three-day compressive strength increased 33.2%, and 28-day compressive strength increased 18.5%. The exothermic peak of hydration heat of cement increased significantly after the addition of nano-SiO2. Appearance time of the exothermic peak was advanced and the total heat release increased. Thermogravimetric-differential scanning calorimetry (TG-DSC) analysis showed that nano-SiO2 promoted the formation of C–S–H gel. The results of mercury intrusion porosimetry (MIP) showed that the total porosity of cement paste with 3% nano-SiO2 was reduced by 5.51% and 5.4% at three days and 28 days, respectively, compared with the pure cement paste. At the same time, the pore structure of cement paste was optimized, and much-detrimental pores and detrimental pores decreased, while less harmful pores and innocuous pores increased. View Full-Text
Keywords: nano-SiO2; cement-based materials; physical and mechanical properties; porosity nano-SiO2; cement-based materials; physical and mechanical properties; porosity
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MDPI and ACS Style

Wang, L.; Zheng, D.; Zhang, S.; Cui, H.; Li, D. Effect of Nano-SiO2 on the Hydration and Microstructure of Portland Cement. Nanomaterials 2016, 6, 241. https://doi.org/10.3390/nano6120241

AMA Style

Wang L, Zheng D, Zhang S, Cui H, Li D. Effect of Nano-SiO2 on the Hydration and Microstructure of Portland Cement. Nanomaterials. 2016; 6(12):241. https://doi.org/10.3390/nano6120241

Chicago/Turabian Style

Wang, Liguo, Dapeng Zheng, Shupeng Zhang, Hongzhi Cui, and Dongxu Li. 2016. "Effect of Nano-SiO2 on the Hydration and Microstructure of Portland Cement" Nanomaterials 6, no. 12: 241. https://doi.org/10.3390/nano6120241

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