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• Overall, the RC agents tested were found to be efficient components to enhance the properties of wet-mix shotcrete. Ezgi Yurdakul is a Concrete Scientist in the R&D Division References at W. R. Grace, Cambridge, MA. 1. Ghasemi, A.M.R.; Parhizkar, T.; and Ramezanianpour, She received her PhD from A.A., “Influence of Colloidal Nano­SiO Addition as Silica Iowa State University, Ames,2 Fume Replacement Material in Properties of Concrete,” IA. She is currently Secretary of Second International Conference on Sustainable Construction Materials and Technologies, Ancona, Italy, 2010. ACI Subcommittee 211-A, Pro- 2. Bergna, H.E., and Roberts, W.O., Colloidal Silica: portioning-Editorial, and a Fundamentals and Applications, Taylor and Francis Group, member of ACI Committees 211, Proportioning LLC, Boca Raton, FL, 2006, 944 pp. Concrete Mixtures; 212, Chemical Admixtures; 3. Collepardi, M.; Ogoumah-Olagot, J.J.; Skarp, U.; 506, Shotcreting; 544, Fiber-Reinforced Con- and Troli, R., “Influence of Amorphous Colloidal Silica on the Properties of Self-Compacting Concretes,” Proceed- crete; and ACI Subcommittees 506-A, Shotcreting- ings of the International Conference, Dundee, UK, 2002, Evaluation; 506-B, Shotcreting-Fiber-Reinforced; pp. 473-483. 506-C, Shotcreting-Guide; and 506-E, Shot- 4. Said, A.M.; Zeidan, M.S.; Bassuoni, M.T.; and Tian, Y., creting-Specifications. Her research interests “Properties of Concrete Incorporating Nano-Silica,” Construc- include shotcrete, performance-based specifica- tion and Building Materials, V. 36, 2012, pp. 838-844. 5. Senff, L.; Labrincha, J.A.; Ferreira, V.M.; Hotza, D.; tions for concrete, mixture design optimization, and Repette, W.L., “Effect of Nano-Silica on Rheology and and chemical admixtures. Fresh Properties of Cement Pastes and Mortars,” Construction and Building Materials, V. 23, 2009, pp. 2487-2491. Klaus-Alexander Rieder is a 6. Jo, B.W.; Kim, C.H.; and Lim, J.H., “Characteristics of Global Concrete Technology Cement Mortar with Nano-SiO Particles,” ACI Materials Journal, V. 104, No. 4, July-Aug. 2007, pp. 404-407. Manager at W. R. Grace, Luegde,2 7. Biricik, H., and Sarier, N., “Comparative Study of the Germany. He received his ScD Characteristics of Nano Silica-, Silica Fume- and Fly Ash- in physics from the Technical Incorporated Cement Mortars,” Materials Research, V. 17, University of Vienna, Vienna, No. 3, 2014, pp. 570-582. Austria, in 1995. He is a 8. Quercia, G.; Husken, G.; and Brouwers, H.J.H., “Water Demand of Amorphous Nano Silica and its Impact on the member of ACI Committees Workability of Cement Paste,” Cement and Concrete 209, Creep and Shrinkage in Concrete; 215, Research, V. 42, 2012, pp. 344-357. Fatigue of Concrete; 360, Design of Slabs on 9. Qing, Y.; Zenan, Z.; Deyu, K.; and Rongshen, C., Ground; 506, Shotcreting; 544, Fiber-Rein- “Influence of Nano­SiO Addition on Properties of Hardened forced Concrete; ACI Subcommittees 544-C,2 Cement Paste as Compared with Silica Fume,” Construction and Building Materials, V. 21, No. 3, 2007, pp. 539-545. FRC-Testing; 544-D, FRC-Structural Uses; 10. EN 12350-5:2009, “Testing Fresh Concrete. Flow 544-E, FRC-Mechanical Properties; 544-F, Table Test,” European Committee for Standardization, FRC-Durability; and Joint ACI-ASCE Com- Brussels, Belgium, 2009, 14 pp. mittee 446, Fracture Mechanics of Concrete. 11. EN 14488-2:2006, “Testing Sprayed Concrete. His research interests include all durability- and Compressive Strength of Young Sprayed Concrete,” European Committee for Standardization, Brussels, Belgium, 2006, cracking-related aspects of concrete and the 14 pp. development of high-performance fibers for 12. EN 12390-3:2009, “Testing Hardened Concrete. concrete applications. Compressive Strength of Test Specimens,” European Committee for Standardization, Brussels, Belgium, 2009, 22 pp. 13. EN 12390-8:2009, “Testing Hardened Concrete. Depth of Penetration of Water under Pressure,” European Committee for Standardization, Brussels, Belgium, 2009, 10 pp. 14. Beaupré, D., “Shootability of Fresh Shotcrete,” Proceedings of the International RILEM Conference on Production Methods and Workability of Concrete, P.J.M. Lic# 850501 Bartos, D.J. Cleland, and D.L. Marrs, eds., E&FN Spon, ROB VONARB Oxford, UK, 1996, pp. 95-108. President 15. Jolin, M.; Burns, D.; Bissonnette, B.; Gagnon, F.; and Bolduc, L.S., “Understanding the Pumpability of Concrete,” PH: 818-833-1293 Proceedings of Shotcrete of Underground Support XI, FAX: 818-833-1294 Whistler, BC, Canada, 2009. CELL: 818-519-7468 16. Jonsson, B.; Nonat, A.; Labbez, C.; Cabane, B.; and rob@shotcreteinc.com Wennerstrom, H., “Controlling the Cohesion of Cement Paste,” Langmuir, V. 21, 2005, pp. 9211-9221. www.shotcreteinc.com 17. ACI Committee 506, “Guide to Shotcrete (ACI 506R- 05),” American Concrete Institute, Farmington Hills, MI, 12965 San Fernando Rd. Sylmar, CA 91342 2005, 40 pp. Shotcrete • Spring 2015 31


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