Open AccessEarly-age Shrinkage-induced Cracking Prevention of Cast-in-place Concrete of Subway Station under Marine Environmental Conditions
Author(s) -
Quanwei Liu,
Jian Zhang,
Wen Xu,
Yujiang Wang,
Hongbo Wang,
Quan Wen
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1637/1/012046
Subject(s) - shrinkage , cracking , materials science , leakage (economics) , composite material , geotechnical engineering , environmental science , geology , economics , macroeconomics
Early-age cracking and leakage phenomena has became a serious problem for cast-in-place concrete of underground station in marine environment, in the present work, an anti-cracking admixture (HME-V) with temperature rise inhibition and micro-expansion properties were adopted to mitigate shrinkage cracking risk. Results indicated that the usage of HME-V exhibits larger expansion behavior not only at temperature rise period but also at temperature fall period, leading to the compensation of real-time shrinkages in concrete. Meanwhile, the early adiabatic temperature rise rate can be significantly reduced with no influence on final value. As a result, the temperature peak value and average cooling rate of the field concrete were decreased by 21.0% and 24.2% respectively. In addition, the usage of HME-V displays considerable impact on early-age compressive strength and but made no difference to the later ones. As no visible cracks and water leakage were observed in the sidewall structure, this work may prove a feasible approach to prevent early-age shrinkage crack of cast-in-place concrete used for underground station.