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Shear strength of concrete beams cast with self- compacting concrete containing different fillers and coarse aggregates

机译:用包含不同填料和粗骨料的自密实混凝土浇铸的混凝土梁的抗剪强度

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摘要

An experimental investigation was conducted to evaluate the shear strength provided by different self-compacting concrete mixes proportioned using different fillers and coarse aggregates. A total of 28 simple beams without shear reinforcement were tested in flexure. The test parameters included the use of gravel versus crushed dolomite as coarse aggregates, the amount of longitudinal reinforcement, and the composition and percentage of fillers. Dolomite stone powder with either silica fume or fly ash was used as fillers replacing cement aiming at reducing the cost of the mix and obtaining better performance. The test results indicated that the overall structural performance in terms of cracking pattern and shear strength was comparable in all mixes. While the dolomite beams sustained higher ultimate shear loads, the normalized shear strength of most of the gravel beams were higher compared to their dolomite counterparts due to the capability of gravel beams to develop interlocking mechanisms and post-cracking shear resistance compensating the influence of the lower compressive strength.
机译:进行了一项实验研究,以评估由使用不同填料和粗骨料配比的不同自密实混凝土混合物提供的剪切强度。总共测试了28条没有抗剪加固的简单梁的挠曲性。测试参数包括使用砾石与碎白云石作为粗骨料,纵向钢筋的量以及填料的组成和百分比。具有硅灰或粉煤灰的白云石石粉被用作代替水泥的填料,旨在降低混合物的成本并获得更好的性能。测试结果表明,在所有混合物中,就裂纹模式和剪切强度而言,总体结构性能均相当。尽管白云石梁承受较高的极限剪力,但大多数砾石梁的规范化抗剪强度均高于白云石对应物,这是由于砾石梁具有形成互锁机制的能力以及开裂后的抗剪强度补偿了较低的影响。抗压强度。

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