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Effect of coarse aggregates and sand contents on workability and static stability of self-compacting concrete

机译：粗集料和含砂量对自密实混凝土可加工性和静态稳定性的影响。

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摘要

In this paper, the workability and static stability were evaluated using a proposed test method. Workability and static stability represent a key property of self-compacting concrete (SCC) in fresh state. A number of standardized test methods were developed to assess these properties. However, no accelerated test method reliably predicts both workability and static stability of SCC. In the present work, a modified K-slump test method was developed to evaluate workability and static stability of SCC. In order to take implicit mixture variations of SCC constituents that can affect fresh SCC properties, a central composite design was adopted to highlight the effect of gravel to sand ratio (G/S), gravel 3/8 to gravel 8/15 ratio (G1/G2), water to cement ratio (W/C), marble powder to cement ratio (MP/C) and superplasticizer content (SP) on workability measured with slump and flow time (T50) tests and static stability measured with sieve stability test (Pi), segregation test index (SSI), Penetration test (Pd) and the proposed K-slump test (Km). The obtained results show that G/S ratio close to 1 and G1/G2 ratio close to 60% can be considered as optimal values to achieve a good workability while ensuring a sufficient static stability of SCC. Acceptable relationships were obtained between Slump flow, Pi, Pd and Km. Results show that the proposed K-slump test allow to assess both workability and static stability of fresh SCC mixtures.
机译：在本文中，使用建议的测试方法评估了可加工性和静态稳定性。可加工性和静态稳定性代表着新鲜状态下的自密实混凝土（SCC）的关键特性。开发了许多标准化的测试方法来评估这些特性。但是，没有一种加速测试方法能够可靠地预测SCC的可操作性和静态稳定性。在目前的工作中，开发了一种改进的K坍落度测试方法来评估SCC的可加工性和静态稳定性。为了对可能影响新鲜SCC特性的SCC成分进行隐式混合变化，采用了中央复合设计来强调砾石与砂之比（G / S），砾石3/8与砾石8/15之比（G1）的影响。 / G2），水灰比（W / C），大理石粉灰比（MP / C）和高效减水剂含量（SP），通过坍落度和流动时间（T50）测试测得的可加工性，以及通过筛网稳定性测试测得的静态稳定性（Pi），偏析测试指数（SSI），渗透测试（Pd）和拟议的K坍落度测试（Km）。获得的结果表明，可以将接近1的G / S比和接近60％的G1 / G2比视为在确保SCC足够的静态稳定性的同时实现良好的可加工性的最佳值。在坍落流量，Pi，Pd和Km之间获得了可接受的关系。结果表明，建议的K坍落度测试可以评估新鲜SCC混合物的可加工性和静态稳定性。

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