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Goin’ Underground 7. BS-EN 14488, “Testing Sprayed Concrete,” British 14. Nordström, E., “Durability of Steel Fiber Reinforced Standards Institute, London, UK, 2006. Shotcrete with Regard to Corrosion,” Shotcrete: Engineering 8. ASTM C1550-12, “Standard Test Method for Flexural Developments, E.S. Bernard, ed., CRC Press, Boca Raton, FL, Toughness of Fiber Reinforced Concrete (Using Centrally pp. 213-217. Loaded Round Panel),” ASTM International, West Con- 15. Bernard, E.S., “Age-Dependent Changes in Post- shohocken, 2012, 14 pp. Crack Performance of Fibre Reinforced Shotcrete Linings,” 9. Bernard, E. S., “Correlations in the Behaviour of Tunnelling and Underground Space Technology, V. 49, 2015, Fibre Reinforced Shotcrete Beam and Panel Specimens,” pp. 241-248. Materials and Structures, RILEM, V. 35, No. 3, Apr. 2002, 16. Bernard, E.S., “Age-Dependent Changes in Post- pp. 156-164. Cracking Performance of Fiber-Reinforced Concrete for 10. Maidl, B.; Nitschke, A.; and Ortu, M., “Design of Steel Tunnel Segments,” 15th Australian Tunnelling Conference Fiber Reinforced Concrete in Tunneling,” Final report DBV 2014, Sydney, Australia, Sept. 17-19, 2014, pp. 229-235. No. 211 and AiF no. 11427 N, Fraunhofer IRB, Oberlainder, 17. Bjontegaard, O.; Myren, S.A.; Klemtsrud, K.; and Germany, June 1999. Kompen, R., “Fiber Reinforced Sprayed Concrete (FRSC): 11. Nitschke, A., “Calculation of the Load-Bearing Energy Absorption Capacity from 2 days age to One Year,” Behavior and Test Evaluation for Steel Fiber Reinforced Seventh International Symposium on Sprayed Concrete, Concrete in Tunneling—Presentation of a New Method,” Sandefjord, Norway, June 16-19, 2014, pp. 88-97. Bauingenieur, V. 74, Feb. 1999, pp. 82-90. 18. Bernard, E.S., “The Influence of Reinforcement on 12. Nitschke, A., “Load-Bearing Behavior of Steel Fiber Relative Creep Deformations in Shotcrete Linings,” Shotcrete, Reinforced Concrete in Tunneling,” PhD dissertation, Ruhr V. 14, No. 4, Fall 2012, pp. 52-57. Universität Bochum, Bochum, Germany, 1998. 19. Gilbert, R.I., and Bernard, E.S., “Time-Dependent 13. Nordström, E., “Durability of Steel Fiber Reinforced Analysis of Macro Synthetic FRC Sections with Conventional Sprayed Concrete with Regard to Corrosion,” Proceedings, Bar Reinforcement,” World Tunnelling Congress (WTC 2015), 3rd International Symposium on Sprayed Concrete, Gol, Dubrovnik, Croatia, May 2015. Norway, Sept. 26-29, 1999. Ralf Winterberg specializes in He chaired the Fibres Technical Committee of fiber reinforcement for concrete EFNARC and is member of ITA-AITES WG12, and its application development. Shotcrete Use, and ITA-Tech AG, Support. Winter- He received his MSc in civil berg has published numerous papers and articles engineering and his PhD on the on the performance of fiber-reinforced concrete with cracking behavior of steel fiber- a focus on structural and durability improvements reinforced concrete from Ruhr and on the fire resistance of concrete. He further University Bochum, Bochum, shared his knowledge and experience in numerous Germany. After serving as Technical Director and seminars in many countries. Managing Director in German companies, he started his own engineering company for the devel- Axel G. Nitschke is Vice Presi- opment of fiber-reinforced concrete solutions and dent of Gail Zeidler Consul- applications in 2004. Since 2005, he has been tants. He received his MSc and working also as a consultant to the Fibre Division PhD in civil engineering in of Officine Maccaferri S.p.A., headquartered in 1993 and 1998, respectively, Italy, supporting their worldwide subsidiaries in the from Ruhr University Bochum technical market development of the Fibre Division. and is a licensed professional In February 2010, he joined Maccaferri Asia Head- engineer in Virginia and Cali- quarters in Malaysia as Business Development fornia. He has gained more than 20 years of in- Manager and Technical Director of the Fibre Divi- depth, on-the-job experience in all aspects of sion Asia/Oceania. In July 2014, he joined Elasto underground construction, geotechnical engi- Plastic Concrete, the market leaders in structural neering, and mining. He has worked on the engi- synthetic fiber-reinforcement, headquartered in neering and construction of a large number of Australia, to take up the role as Group Chief Engi- tunnel projects in Europe, the United States, neer for their worldwide structure. Winterberg Canada, and Colombia. He is well-experienced co-authored the “Steel Fibre Reinforced Concrete” in all ground conditions, ranging from soft ground guide to good practice by the German Concrete to hard rock, and the associated implications for Association, and contributed to RILEM TC162- design and construction methods. Nitschke has TDF, “Test and Design Methods for SFRC,” as well held key positions such as Senior NATM Engineer, as to CEN TC104 WG11, “Fibres for Concrete,” Contract/Claims Manager, Risk Manager, Design for the harmonized European Standard EN 14889. Manager, and Project Manager. Shotcrete • Summer 2015 53


2015SummerShotcreteEMag
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