含不同几何形状钢纤维的含水泥和不含水泥混凝土的挠曲韧性和协同作用评估

IF 1.7 4区 工程技术 Q3 ENGINEERING, CIVIL
B. Sankar, D. Rameshkumar, P. Swaminathan, K. Arunkumar
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引用次数: 0

摘要

随着时间的推移,脆性对水泥基材料的耐久性构成重大威胁。在传统水泥混凝土中,同时加入毛细管和纤维为解决脆性问题和环境影响提供了一种新颖、环保的方法。本文研究了硅灰(SF)和偏高岭土(MK)等普通硅酸盐水泥中的毛细管替代物对钢纤维增强混凝土(SFRC)机械性能和韧性的影响。在研究的第一部分,水与粘结剂之比为 0.4 的参考素混凝土拌合物与不同比例的不同几何形状的钢纤维(如卷曲钢纤维 (CS) 和直钢纤维 (SS))混合,既有单独混合,也有混合组合,以确定其力学性能。在第二部分,研究评估了 CS 和 SS 纤维的组合如何影响挠曲韧性,旨在确定可协同提高性能的组合。该研究还考察了混合钢纤维增强混凝土(Hy-SFRC)的挠曲韧性受到的微粒影响。通过观察发现,钢纤维杂化提高了工作性。与非混凝剂 SFRC 相比,混凝剂 SFRC 的抗压强度、断裂模量和弹性模量的增加幅度更大。与参考混合材料相比,SF 和 MK 三元混合材料的 28 天抗压强度、抗折强度和弹性模量分别提高了 18.5%、91% 和 18.7%。CS 1.5% 和 SS 0.5% 的混合组合被认为是机械性能最好的。等效抗弯韧性结果表明,二元和三元混合混合材料的抗弯韧性比非混合材料的抗弯韧性高,这只能归因于纤维与基质的结合更牢固。此外,协同量化结果表明,杂化在开裂后阶段最为有效。含有 SF 和 MK 三元混合物的 Hy-SFRC 在达到 L/150 时可提供 61.49 J 的最大韧性。含有 SF 10% 和 MK 10% 的三元混合物的 Hy-SFRC 混合物的抗弯韧性最好,相应的协同作用值也最大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Flexural Toughness and Synergy Assessment of Pozzolanic and Non-pozzolanic Concrete Containing Steel Fibers With Varying Geometry

Flexural Toughness and Synergy Assessment of Pozzolanic and Non-pozzolanic Concrete Containing Steel Fibers With Varying Geometry

Brittleness poses a significant threat to the durability of cement-based materials over time. The simultaneous addition of pozzolans and fibers offers a novel and eco-friendly approach to tackle concerns regarding brittleness and environmental impacts associated with conventional cement concrete. This paper investigates the effects of pozzolanic substitutions such as silica fume (SF) and metakaolin (MK) for Ordinary portland cement on the mechanical and toughness performances of steel fiber reinforced concrete (SFRC). In the first part of the study, reference plain concrete mix with a water-to-binder ratio of 0.4 is mixed with different percentages of steel fibers with varying geometry, such as crimped steel (CS) and straight steel (SS) fibers, both as individual and hybrid combinations, to determine the mechanical properties. In the second part, the study evaluated how combining CS and SS fibers influence flexural toughness, aiming to identify combinations that may synergistically enhance performance. The study also examined the influence of pozzolans on the flexural toughness of hybrid steel fiber reinforced concrete (Hy-SFRC). An increase in workability was observed due to the hybridization of steel fibers. The increase in compressive strength, modulus of rupture, and modulus of elasticity was greater in pozzolanic SFRC compared to non-pozzolanic SFRC. The ternary mix of SF and MK showed 18.5%, 91%, and 18.7% improvement in 28-day compressive strength, flexural strength and modulus of elasticity compared to the reference mix. The hybrid combination of CS 1.5% and SS 0.5% was considered the best in terms of mechanical properties. The equivalent flexural toughness results indicated that, both binary and ternary pozzolanic Hy-SFRC was higher compared to non-pozzolanic Hy-SFRC, which can only be mapped to the stronger fiber-matrix bond. Also, the synergy quantification revealed that hybridization was most effective in the post-cracking stages. Hy-SFRC containing the ternary mixture of SF and MK provided a maximum toughness of 61.49 J measured up to L/150. Hy-SFRC mix containing a ternary pozzolanic combination of SF 10% and MK 10% gave the best results in flexural toughness, and the corresponding synergy values were found to be the maximum.

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来源期刊
CiteScore
3.30
自引率
11.80%
发文量
203
期刊介绍: The aim of the Iranian Journal of Science and Technology is to foster the growth of scientific research among Iranian engineers and scientists and to provide a medium by means of which the fruits of these researches may be brought to the attention of the world’s civil Engineering communities. This transaction focuses on all aspects of Civil Engineering and will accept the original research contributions (previously unpublished) from all areas of established engineering disciplines. The papers may be theoretical, experimental or both. The journal publishes original papers within the broad field of civil engineering which include, but are not limited to, the following: -Structural engineering- Earthquake engineering- Concrete engineering- Construction management- Steel structures- Engineering mechanics- Water resources engineering- Hydraulic engineering- Hydraulic structures- Environmental engineering- Soil mechanics- Foundation engineering- Geotechnical engineering- Transportation engineering- Surveying and geomatics.
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