Research on Effect of Nano-Silica on the Recyling Performance of Waste Fresh Concrete

WANG Weicheng; ZHANG Daoming; FANG Guoxiang; ZHANG Xueyuan; WANG Yue

doi:10.13204/j.gyjzG22022406

Volume 52 Issue 11

Nov. 2022

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2022 > 52(11): 199-206

WANG Weicheng, ZHANG Daoming, FANG Guoxiang, ZHANG Xueyuan, WANG Yue. Research on Effect of Nano-Silica on the Recyling Performance of Waste Fresh Concrete[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(11): 199-206. doi: 10.13204/j.gyjzG22022406

Citation:

WANG Weicheng, ZHANG Daoming, FANG Guoxiang, ZHANG Xueyuan, WANG Yue. Research on Effect of Nano-Silica on the Recyling Performance of Waste Fresh Concrete[J]. INDUSTRIAL CONSTRUCTION, 2022, 52(11): 199-206. doi: 10.13204/j.gyjzG22022406

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Research on Effect of Nano-Silica on the Recyling Performance of Waste Fresh Concrete

doi: 10.13204/j.gyjzG22022406

1. College of Material Science and Engineering, Qiqihar University, Qiqihar 161006, China;
2. College of Architecture and Civil Engineering, Qiqihar University, Qiqihar 161006, China;
3. Chengbang Ecological Environment Co., Ltd., Hangzhou 310008, China

Received Date: 2022-02-22

Abstract

Abstract

For the waste fresh concrete that cannot be used due to too long storage time, the optimal storage time (120 min) was selected comprehensively by testing the effect of storage time on the performance of waste fresh concrete, and fresh concrete was replaced at 30% replacement rate to directly prepare recycled fresh concrete. At the same time, the influence of different nano-silica content on the mechanical properties and working properties of recycled fresh concrete was tested, and its microstructure and structure were analyzed. The results showed that when the nano-silica content was 3%, the 28 d compressive strength and splitting tensile strength of recycled fresh concrete were increased by 45.6% and 63.9%; XRD, SEM and EDS analysis showed that the precipitation of H₂SiO₃ acid in the nano-silica could be accelerated in an alkaline environment, and a large amount of C-S-H gel (type I) gel could be formed by reacting with Ca²⁺, they could promote the hydration reaction of clinker such as C₃S and C₂S, reduce Ca/Si and make cement paste and aggregate closely connected, C-S-H gel filled some pores and cracks, the interface transition zone was more compact, and the strength of recycled fresh concrete was significantly improved.
- waste fresh concrete,
- nano-silica,
- recycled fresh concrete,
- mechanical properties,
- microstructure

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References(22)

References

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