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Goin’ Underground 7. Yurdakul, E., and Rieder, K.A., “Effect of Pozzolanic Based Rheology Control Agent as a Replacement for Silica Fume on Wet-Mix Shotcrete Performance,” Shotcrete, V. 17, No. 2, Spring 2015, pp. 26-31. 8. Ovstaas, G.; Heere, R.; Horth, R.; and Yurdakul, E., “Evaluation of the Use of Colloidal Silica as a Silica Fume Replacement in Wet Mix Shotcrete,” Proceedings, 5th International Conference on Construction Materials: Performance, Innovations and Structural Implications, Whistler, BC, Canada, 2015. 9. Yurdakul, E.; Rieder, K.A.; Vicencio, B.; Staforelli, G.; and Granell, D., “A Case Study on the Impact of Pozzolanic- Based Rheology Control Agent on Wet-Mix Shotcrete Performance in Underground Applications,” Proceedings, Shotcrete for Underground Support XII, Singapore, 2015. 10. EN 12390-8, “Testing Hardened Concrete. Depth of Penetration of Water under Pressure,” British Standards Institution, London, UK, 2009. 11. ASTM C642, “Standard Test Method for Density, Absorption, and Voids in Hardened Concrete,” ASTM International, West Conshohocken, PA, 2013. Ezgi Yurdakul is a Concrete Scientist in the R&D Division at Grace Construction Products, Cambridge, MA. She received her PhD from Iowa State University, Ames, IA. She is currently the Vice Chair of ACI Committee 211, Proportioning Concrete Mixtures; Secretary of ACI Subcommittee 211-A, Proportioning-Editorial; and a member of ACI Committees 212, Chemical Admixtures; 325, Concrete Pavements; 506, Shotcreting; 544, Fiber-Reinforced Concrete; as well as ASA committees. Her research interests include shotcrete, mixture design optimization, chemical admixtures, and performance-based specifications for concrete. Klaus-Alexander Rieder is a Global R&D Director for Concrete Products at Grace Construction Products, Luegde, Germany. He received his ScD in physics from the Technical University of Vienna, Vienna, Austria, in 1995. He is a member of ACI Committees 209, Creep and Shrinkage in Concrete; 215, Fatigue of Concrete; 360, Design of Slabs on Ground; 506, Shotcreting; 544, Fiber-Reinforced Concrete; Joint ACI-ASCE Committee 446, Fracture Mechanics of Concrete; as well as ASTM International and RILEM committees. His research interests include all durability- and cracking-related aspects of concrete and the development of high-performance fibers for concrete and shotcrete applications. Case Study C. Both mixtures performed in a similar manner, as the differences in boiled absorption were within 1 and 2% for the volume of permeable voids. References 1. Wolsiefer Sr., J., and Morgan, D.R., “Silica Fume in Shotcrete,” Shotcrete, V. 5, No. 1, Winter 2003, pp. 30-33. 2. Quercia, G.; Husken, G.; and Brouwers, H.J.H., “Water Demand of Amorphous Nano Silica and Its Impact on the Workability of Cement Paste,” Cement and Concrete Research, V. 42, 2012, pp. 344-357. 3. Jönsson, B.; Nonat, A.; Labbez, C.; Cabane, B.; and Wennerstrom, H., “Controlling the Cohesion of Cement Paste,” Langmuir, American Chemical Society, V. 21, 2005, pp. 9211-9221. 4. Bergna, H.E., and Roberts, W.O., Colloidal Silica Fundamentals and Applications, Taylor and Francis Group, LLC, Boca Raton, FL, 2006. 5. EN 14488-2, “Testing Sprayed Concrete. Compressive Strength of Young Sprayed Concrete,” British Standards Institution, London, UK, 2006. 6. ASTM C39, “Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens,” ASTM International, West Conshohocken, PA, 2015. 52 Shotcrete • Winter 2016


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