Preparation and Experimental Investigations of Low-Shrinkage Commercial Concrete for Tunnel Annular Secondary Lining Engineering

Secondary lining concrete is frequently used in underground tunnels. Due to the internal restriction of the annular concrete segment, micro-cracks may be caused by temperature stress and volume deformation, thus affecting the safe transportation of the tunnel. The purpose of this study is to provide...

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Bibliographic Details
Published in:Materials 2022-10, Vol.15 (19), p.6848
Main Authors: Yang, Jin, Wang, Tie, He, Xingyang, Su, Ying, Dai, Fei, Xiong, Long, Zhao, Rixu, Duan, Xuyang
Format: Article
Language:English
Subjects:
Cement
Concrete
Concrete mixing
Drinking water
Engineering
Hydration
Microcracks
Particle size
Reducing agents
Shrinkage
Superabsorbent polymers
Temperature effects
Traffic congestion
Tunnel construction
Tunnels
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Summary:Secondary lining concrete is frequently used in underground tunnels. Due to the internal restriction of the annular concrete segment, micro-cracks may be caused by temperature stress and volume deformation, thus affecting the safe transportation of the tunnel. The purpose of this study is to provide a concrete experimental basis with low hydration heat and low shrinkage for tunnel engineering with different construction requirements. Different amounts of expansion agent (EA), shrinkage-reducing agent (SRA), and superabsorbent polymer (SAP) were considered in commercial concrete. It was found that EA elevated the degree of hydration and the hydration exothermic rate, while SRA and SAP showed the opposite regularity. SRA has the optimum shrinkage reduction performance with a 79% reduction in shrinkage, but the strength decreases significantly compared to EA and SAP groups. The effect of the combination of different shrinkage reducing components in commercial concrete is instructive for the hydration rate and shrinkage compensation in secondary lining engineering.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15196848