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2015SpringShotcreteEMag

bubble network; the as-shot air-content is there- fore an excellent QC test. Lihe (John) Zhang is an Engi- Is It Possible To Test Air Content For neer at LZhang Consulting and Dry-Mix Shotcrete? Testing Ltd. Zhang has over 10 years of experience in con- As water is added into the nozzle during the crete technology and the evalu- dry-mix process, the as-batched air content for ation and rehabilitation of dry-mix shotcrete cannot be tested. The as-shot infrastructure. He received his air content for dry-mix shotcrete can be tested by PhD in civil engineering from shooting a pile to the ground or to the wall— the University of British Columbia, Vancouver, samples can be taken from the as-shot shotcrete BC, Canada, where he conducted research on and tested in the air meter. Shooting directly into fiber-reinforced concrete. Zhang is a LEED the air meter is not recommended, as that might Accredited Professional and is a member of the damage the air meter. American Concrete Institute (ACI). He is Chair References of ACI Subcommittee 506-F, Shotcrete-Under- ground; a member of ACI Committees 130, Sus- 1. Vezina, D., and Bertrand, J., “The Development of Air Entrained Durable Shotcrete for Structural Repairs,” tainability of Concrete; 506, Shotcreting; and 544, Proceedings, Shotcrete for Underground Support VII, Telfs, Fiber-Reinforced Concrete; and a member of Austria, June 11-15, 1994. ASTM Committee C09, Concrete and Concrete 2. Seegebrecht, G.W.; Litvin, A.; and Gebler, S.H., Aggregates. He is also Chair of the ASA Education “Durability of Dry-Mix Shotcrete,” Shotcrete, V. 8, No. 2, Spring 2006, pp. 32-35. Subcommittee: Graduate Scholarships, and an 3. Dufour, J.F., “Can Dry-Mix Shotcrete be Air Entrained?” ASA Board member. Shotcrete, V. 10, No. 4, Fall 2008, pp. 28-30. 4. Zhang, L., “Air Content in Shotcrete: As-Shot vs. As- Batched,” Shotcrete, V. 14, No. 1, Winter 2012, pp. 50-54. 5. Neville, A.M., Properties of Concrete, fourth edition, Pearson, New York, 1995, pp. 559-561. Gary Carlson Equipment Rental Allentown Shotcrete Shotcrete PumpsrPutzmiestePumps and Guns Your trusted source for wet and dry shotcrete equipment is fully stocked for both rental and sales ***National Service*** Chemgrout Mixers Pumps and Plants Sullivan Air Compressors Gary Carlson Equipment Co. and Tools Rentals - Sales - Service - Delivery Colidal Mixers 1380 County Rd C West, Roseville MN Reed Shotcrete Systems Pumps 10720 Mankato St., Blaine MN and Guns Phone 763.792.9123 24 Shotcrete • Spring 2015


2015SpringShotcreteEMag
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