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Study on strength and ultrasonic velocity of air-entrained concrete and plain concrete in cold.pdf

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Study on strength and ultrasonic velocity of air-entrained concrete and plain concrete in cold

Research Article Study on Strength and Ultrasonic Velocity of Air-Entrained Concrete and Plain Concrete in Cold Environment Huai-shuai Shang,1,2 Ting-hua Yi,3 and Xing-xing Guo1 1 School of Civil Engineering, Qingdao Technological University, Qingdao 266033, China 2 State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China 3 School of Civil Engineering, Dalian University of Technology, Dalian 116023, China Correspondence should be addressed to Huai-shuai Shang; shanghuaishuai@ Received 11 November 2013; Accepted 2 January 2014; Published 10 February 2014 Academic Editor: Konstantinos I. Tserpes Copyright ? 2014 Huai-shuai Shang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Nondestructive testing technology is essential in the quality inspection of repair, alteration, and renovation of the existing engineering, especially for concrete structure in severe environment. The objective of this work is to deal with the behavior of ultrasonic velocity and mechanical properties of plain concrete and air-entrained concrete subjected to freeze-thaw cycles (F-T-C). The ultrasonic velocity andmechanical properties (tensile strength, compressive strength, cubic compressive strength, and splitting strength) of C30 air-entrained concrete and plain concrete with different water-cement ratio (water-cement ratio was 0.55, 0.45, and 0.50, resp.) after F-T cycles were measured. The influences of F-T cycles on ultrasonic velocity and mechanical properties of C30 air-entrained concrete and plain concrete were analyzed. And the relationship between mechanical properties and ultrasonic velocity was established. The experimental results can be useful for the design of new concrete structure, maintenance and life prediction of existing concrete structure such as of