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Materials 2014, 7(4), 2474-2489; doi:10.3390/ma7042474
Article

Performance-Based Specifications of Workability Characteristics of Prestressed, Precast Self-Consolidating Concrete—A North American Prospective

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Received: 9 January 2014; in revised form: 18 February 2014 / Accepted: 21 March 2014 / Published: 27 March 2014
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Abstract: Adequate selection of material constituents and test methods are necessary for workability specifications and performance of hardened concrete. An experimental program was performed to evaluate the suitability of various test methods for workability assessment and to propose performance specifications of prestressed concrete. In total, 33 self-consolidating concrete (SCC) mixtures made with various mixture proportioning parameters, including maximum size and type of aggregate, type and content of binder, and w/cm were evaluated. Correlations among various test results used in evaluating the workability responses are established. It is recommended that SCC should have slump flow values of 635–760 mm. To ensure proper filling capacity greater than 80%, such concrete should have a passing ability that corresponds to L-box blocking ratio (h2/h1) ≥ 0.5, J-Ring flow of 570–685 mm, slump flow minus J-Ring flow diameter ≤75 mm. Moreover, Stable SCC should develop a column segregation index lower than 5%, and rate of settlement at 30 min of 0.27%/h for SCC proportioned with 12.5 or 9.5 mm MSA. It is recommended that SCC should have a plastic viscosity of 100–225 Pa·s and 100–400 Pa·s for concrete made with crushed aggregate and gravel, respectively, to ensure proper workability.
Keywords: mixture proportioning; workability; rheology; self-consolidating concrete; test method; prestressed concrete mixture proportioning; workability; rheology; self-consolidating concrete; test method; prestressed concrete
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.

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MDPI and ACS Style

Long, W.-J.; Khayat, K.H.; Lemieux, G.; Hwang, S.-D.; Han, N.-X. Performance-Based Specifications of Workability Characteristics of Prestressed, Precast Self-Consolidating Concrete—A North American Prospective. Materials 2014, 7, 2474-2489.

AMA Style

Long W-J, Khayat KH, Lemieux G, Hwang S-D, Han N-X. Performance-Based Specifications of Workability Characteristics of Prestressed, Precast Self-Consolidating Concrete—A North American Prospective. Materials. 2014; 7(4):2474-2489.

Chicago/Turabian Style

Long, Wu-Jian; Khayat, Kamal H.; Lemieux, Guillaume; Hwang, Soo-Duck; Han, Ning-Xu. 2014. "Performance-Based Specifications of Workability Characteristics of Prestressed, Precast Self-Consolidating Concrete—A North American Prospective." Materials 7, no. 4: 2474-2489.


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