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Goin’ Underground and provide an integrated and powerful tool for the engineer to make informed decisions about the safety of the tunnel. Acknowledgements The authors would like to thank BBMV for access to their site at Whitechapel Station for field measurements and much needed technical support during and after the site works. The authors would also like to thank the Calmetrix team for their help and advice on isothermal calorimetric testing. References ASTM C1074, 2011, “Standard Practice for Estimating Concrete Strength by the Maturity Method,” ASTM International, West Conshohocken, PA, 2011. BS EN 14488-2, 2006, “Testing Sprayed Concrete – Part 2: Compressive strength of young sprayed concrete,” British Standards International, London. BS EN 934-5, 2007, “Admixtures for concrete, mortar and grout Part 5: Admixtures for sprayed concrete – Definitions, requirements, conformity, marking and labelling,” British Standards International, London. Byfors, J., 1980, “Plain Concrete at Early Ages,” CBI Forsking Fo 3:80, Swedish Cement and Concrete Research Institute, Stockholm, Sweden, 464 pp. Freiesleben Hansen, P., and Pedersen, J., 1977, “Maturity computer for controlled curing and hardening of concrete,” Nordisk Betong, V. 1, pp. 19-34. HILTI, 2009, “Operating Instructions Manual - Determination of the early strength of sprayed concrete with stud driving method Hilti DX 450-SCT,” pp 1-27. Jones, B. D., and Li, S., 2013, “Strength Monitoring using Thermal Imaging,” Tunnelling Journal, Dec. 2013/Jan. 2014 issue, pp 40-43. Jones, B. D.; Li, S.; and Ahuja, V., 2014, “Early strength monitoring of sprayed concrete using thermal imaging,” Proc. 7th Int. Symp. Sprayed Concrete, Norwegian Concrete Association, Sandefjord, Norway. Kada-Benameur, H.; Wirquin, E.; and Duthoit, B., 2000, “Determination of apparent activation energy of concrete by isothermal calorimetry,” Cement and Concrete Research, V. 30, pp. 301-305. Vishwajeet Ahuja holds a wide array of experience in NATM/ Conventional Tunneling. He has worked on a variety of railway and road tunneling projects, such as Crossrail, Dulles Metrorail, and Rohtang, involving both the soft ground and hard rock conditions while working for consultancies such as Atkins, Dr. Sauer Corp., Gall Zeidler Consultants, and SMEC. He is associated with various technical societies and groups, such as the American Society of Civil Engineers, American Concrete Institute, Institution of Civil Engineers, ITA WG20, and the Tunnelling Association of India. Currently, he is pursuing his PhD in engineering at University of Warwick, Coventry, UK, with a focus on early-age strength development of shotcrete for tunnel lining. Benoit Jones has worked for 15 years in the tunneling industry for Mott MacDonald, Morgan Sindall, OTB Engineering, and until recently, the University of Warwick, where he retains a position as an Honorary Fellow. He has worked on major projects such as Heathrow Terminal 5 tunnels, High Speed 1, Crossrail, King’s Cross Underground Station  Redevelopment, and Tottenham Court Road Station Upgrade. In 2007, he received his engineering doctorate for research on stress measurement in sprayed concrete linings and numerical modeling of tunnel junctions. He has won the ICE’s Telford Premium Award for a paper on the interpretation of tunnel monitoring, has twice given the prestigious ICE Geotechnical Engineering Lecture, and  has written a large number of popular articles on advances in tunneling. He is the inventor of Strength Monitoring Using Thermal Imaging (SMUTI) and is Managing Director of Inbye Engineering, a spin-out company of the University of Warwick set up to enable the adoption of SMUTI by the tunneling industry. The patent and trademark for SMUTI are owned by Inbye Engineering. Safety Guidelines for Shotcrete” Chapter topics include: • Personal Protective Equipment; • Communications; • Lighting, Back, and Spine Safety; • Shotcrete Materials; • Shotcrete Equipment; and • Shotcrete Placement: Wet- and Dry-mix Processes. “ This valuable resource is are available through the ASA Bookstore for $25 each for members; $100 each for nonmembers. Available in both print and electronic formats. Member benefit: all Corporate Members will receive one complimentary copy of this publication! Visit the ASA Bookstore at www.shotcrete.org/ BookstoreNet/default.aspx. 54 Shotcrete • Summer 2016


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