Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 124, Issue -, Pages 1109-1119Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2016.08.126
Keywords
Highly geothermal environment; Adhesion strength; Shrinkage; Shotcrete-surrounded rock; Damage mechanism
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Funding
- Science Fund for Creative Research Groups of the National Natural Science Foundation of China [51321065]
- major project Diversion tunnel support structural stability analysis in a highly geothermal environment
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A novel test control system is used to assess the effects of temperature and humidity on the adhesion strength of shotcrete-surrounded rock. Analysis of the internal structure and defect volume reveals that the adhesion strength increases with relative humidity (RH), whereas higher temperatures and longer setting times increase the risk of shotcrete dehydration through an increase in porosity. The critical temperature at which adhesion strength is lost also increases with RH. This shows that temperature, RH and setting time all greatly influence the adhesion strength of shotcrete-surrounded rock, which is of relevance to diversion tunnel construction in highly geothermal environments. (C) 2016 Elsevier Ltd. All rights reserved.
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