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首页> 外文期刊>American journal of applied sciences >Influences of Short Discrete Fibers in High Strength Concrete with Very Coarse Sand | Science Publications
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Influences of Short Discrete Fibers in High Strength Concrete with Very Coarse Sand | Science Publications

机译：短离散纤维对含沙很粗的高强度混凝土的影响科学出版物

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> Problem statement: High Strength Concrete (HSC) normally content high cementitous amount and low water binder ratio. However, these would cause substantial volume changes to the concrete and therefore affected the strength development. In addition, the brittleness of HSC was increased when silica fume used as partial cement replacement to achieve high strength. Approach: This study discussed the effects of incorporated short discrete Coconut Fibers (CF), Barchip Fibers (BF) and Glass Fibers (GF) into HSC to enhance the performance of concrete while kept the binder content at moderate level. Additional specialty to this HSC was casted with very coarse sand with fineness modulus of 3.98. A total of thirteen mixes were casted and tested for slump, density, compressive strength, flexural strength and ultrasonic pulse velocity in accordance with British Standards. Results: The slump was slightly reduced by the short discrete fibers. All of the fibrous specimens had lower density than control. However, the compressive strength of the HSC had increased from 71.8-79.0 MPa using 1.8% of BF, while flexural strength had increased from 5.21-6.50 MPa. All specimens showed that ultrasonic velocity higher than 4.28 km sec-1. Conclusion/Recommendations: In short, combination of incorporated short discrete fibers and applied very coarse sand to produce HSC showed very satisfying results and improvements. Further assessment on durability and impact resistivity will be verified in the coming research.
机译： > 问题陈述：高强度混凝土（HSC）通常包含高胶凝量和低水硬率。但是，这些会导致混凝土体积发生较大变化，因此会影响强度的发展。另外，当使用硅粉代替部分水泥以达到高强度时，HSC的脆性增加。 方法：这项研究讨论了将短离散椰子纤维（CF），Barchip纤维（BF）和玻璃纤维（GF）掺入HSC中的作用，以提高混凝土性能，同时将粘结剂含量保持在中等水平水平。该HSC的其他特长是用非常粗的砂铸造，细度模量为3.98。总共浇铸了13种混合物，并根据英国标准测试了坍落度，密度，抗压强度，抗弯强度和超声脉冲速度。 结果：短离散纤维缩短了坍落度。所有纤维样品的密度均低于对照。但是，使用1.8％的BF，HSC的抗压强度从71.8-79.0 MPa增加，而抗弯强度从5.21-6.50 MPa增加。所有标本均显示超声速度高于4.28 km sec -1 。 结论/建议简而言之，掺入的短离散纤维和应用非常粗糙的砂以生产HSC的组合显示出非常令人满意的结果和改进。有关耐久性和抗冲击性的进一步评估将在接下来的研究中得到验证。

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