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首页> 外文期刊>Materials >Performance-Based Specifications of Workability Characteristics of Prestressed, Precast Self-Consolidating Concrete—A North American Prospective
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Performance-Based Specifications of Workability Characteristics of Prestressed, Precast Self-Consolidating Concrete—A North American Prospective

机译：基于性能的预应力，预制自固结混凝土的可使用性特性规范-北美的前景

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摘要

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.
机译：材料成分和试验方法的适当选择是必要的加工性的规格和硬化混凝土的性能。进行了一个实验程序，以评估各种测试方法对可使用性评估的适用性，并提出预应力混凝土的性能规格。总共评估了33种具有各种混合配比参数（包括最大尺寸和集料类型，粘结剂的类型和含量以及w / cm）的自凝结混凝土（SCC）混合物。建立了用于评估可加工性响应的各种测试结果之间的相关性。建议SCC的坍落度应为635–760 mm。为了确保适当的填充量大于80％，此类混凝土应具有与L-box封闭率（h 2 / h 1 ）对应的传递能力，≥0.5，J -环流为570–685 mm，坍落度流量减去J环流直径≤75mm。此外，稳定的SCC的柱偏析指数应低于5％，并且与12.5或9.5 mm MSA配比的SCC在30分钟时的沉降速率为0.27％/ h。建议使用碎骨料和砾石制成的混凝土，SCC的塑性粘度分别为100–225 Pa·s和100–400 Pa·s，以确保适当的可使用性。

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