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首页> 外文期刊>Magazine of Concrete Research >Effect of expanded slate aggregate on fresh properties and shear behaviour of lightweight SCC beams
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Effect of expanded slate aggregate on fresh properties and shear behaviour of lightweight SCC beams

机译：膨胀板岩骨料对轻质SCC梁新鲜特性和抗剪性能的影响

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Lightweight normal concrete (NC) and self-consolidating concrete (SCC) mixtures were developed using lightweight expanded slate coarse aggregate. The developed mixtures incorporated natural sand, metakaolin (MK) and fly ash (FA), and had a density in the range 1817-1984 kg/m(3). All the mixtures were developed with variable compressive strengths (20-61 MPa), lightweight expanded slate to fine aggregate (ES/F) ratios (0.7-2.0), water to binder (W/B) ratios (0.35 and 0.40) and variable total binder contents (500 kg/m(3) and 600 kg/m(3)). Tests of the fresh properties of the developed lightweight SCC mixtures included flow/passing ability, viscosity and segregation resistance tests. The developed lightweight NC and SCC mixtures were also used to cast 12 identical beams without shear reinforcement to examine their shear strength and cracking behaviour in full-scale concrete structures. The results of the trial mixtures performed on a wide range of ES/F ratios showed that a maximum ES/F ratio of 1.5 could produce lightweight SCC mixtures with acceptable fresh properties and compressive strength, while a maximum ES/F ratio of 2 was able to produce NC mixtures. Although an increase in ES/F ratio decreased the density of the SCC mixtures, it decreased the 28 d compressive strength, reduced the mixture flow ability and passing ability, and increased the segregation risk. However, increasing the ES/F ratio increased the normalised shear loads and post diagonal cracking resistance of all the tested beams. This is because the tested expanded slate aggregate proved to be relatively strong as it did not entirely break along the diagonal crack surface, even in mixtures of 61 MPa strength.
机译：使用轻质膨胀板岩粗骨料开发了轻质普通混凝土（NC）和自固结混凝土（SCC）混合物。所开发的混合物包括天然沙子，偏高岭土（MK）和粉煤灰（FA），密度范围为1817-1984 kg / m（3）。所有混合物的开发均具有可变的抗压强度（20-61 MPa），轻质膨胀板岩与细骨料（ES / F）的比率（0.7-2.0），水与粘合剂的比率（W / B）的比率（0.35和0.40）和可变的总粘合剂含量（500 kg / m（3）和600 kg / m（3））。开发的轻质SCC混合物的新鲜性能测试包括流动/通过能力，粘度和抗偏析性测试。已开发的轻质NC和SCC混合物还用于浇铸12条相同的，无剪切增强的梁，以检查它们在全尺寸混凝土结构中的剪切强度和开裂行为。在广泛的ES / F比范围内进行试验混合物的结果表明，最大ES / F比为1.5可以生产出具有可接受的新鲜性能和抗压强度的轻质SCC混合物，而最大ES / F比为2生产NC混合物。尽管ES / F比的增加降低了SCC混合物的密度，但降低了28 d的抗压强度，降低了混合物的流动能力和通过能力，并增加了离析风险。但是，增加ES / F比会增加所有测试梁的归一化剪切载荷和对角线抗开裂性。这是因为事实证明，即使在强度为61 MPa的混合物中，测试的膨胀板岩骨料也相对坚硬，因为它不会完全沿着对角线裂纹表面破裂。

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  • 来源
    《Magazine of Concrete Research》 |2015年第10期|433-442|共10页
  • 作者

    Abouhussien Ahmed A.; Hassan Assem A. A.; Hussein Amgad A.;

  • 作者单位

    Mem Univ Newfoundland, Dept Civil Engn, Fac Engn & Appl Sci, St John, NF, Canada;

    Mem Univ Newfoundland, Dept Civil Engn, Fac Engn & Appl Sci, St John, NF, Canada;

    Mem Univ Newfoundland, Dept Civil Engn, Fac Engn & Appl Sci, St John, NF, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
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  • 正文语种 eng
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