Impact of Rubber Content on Performance of Ultra-High-Performance Rubberised Concrete (UHPRuC)

IF 3.6 3区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY
Thong M. Pham, Josh Lee, Emad Pournasiri, Jun Li, Zhen Peng, Kaiming Bi, Tung M. Tran
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Abstract

This study investigated the effect of rubber content on the mechanical characteristics of ultra-high-performance rubberised concrete (UHPRuC). The results revealed a distinctive non-linear decrease in the dry density of UHPRuC as the rubber content increased. Notably, lower rubber content led to a columnar failure mode, while higher content (≥ 20%) exhibited a mixed failure mode with vertical cracking and diagonal fracture. Importantly, the compressive strength showed minimal reduction compared to conventional concrete, presenting a remarkable 50% mitigation of strength reduction compared to previous studies. Utilising reference concrete with robust bond strength proved highly effective in preserving strength in rubberized concrete. Despite its effectiveness in mitigating compressive strength reduction, UHPC could not effectively offset flexural strength loss, which ranged from 1.5 to 3 times that of compressive strength loss. The addition of rubber aggregate in UHPC reduced the peak flexural strength, residual strength, and flexural toughness at a similar rate, while significantly increasing the vibration decaying rate. Incorporating 40% rubber in UHPRuC reduced the eCO2 up to 37%. Our findings emphasise the importance of reference concrete with good bond strength and shows that the addition of rubber aggregate in UHPC leads to reductions in strength but increases the energy-dissipating capacity.

Abstract Image

橡胶含量对超高性能橡胶混凝土 (UHPRuC) 性能的影响
本研究调查了橡胶含量对超高功能橡胶混凝土(UHPRuC)机械特性的影响。结果显示,随着橡胶含量的增加,UHPRuC 的干密度出现了明显的非线性下降。值得注意的是,较低的橡胶含量会导致柱状破坏模式,而较高的含量(≥ 20%)则表现出垂直开裂和斜向断裂的混合破坏模式。重要的是,与传统混凝土相比,抗压强度的降低幅度很小,与之前的研究相比,强度降低幅度显著减少了 50%。事实证明,利用粘结强度高的参照混凝土能非常有效地保持橡胶混凝土的强度。尽管 UHPC 能有效减轻抗压强度的降低,但却无法有效抵消抗折强度的降低,抗折强度的降低幅度是抗压强度降低幅度的 1.5 到 3 倍。在 UHPC 中添加橡胶骨料会以类似的速度降低峰值抗折强度、残余强度和抗折韧性,同时显著增加振动衰减率。在 UHPRuC 中加入 40% 的橡胶可使 eCO2 降低 37%。我们的研究结果强调了具有良好粘结强度的参考混凝土的重要性,并表明在 UHPC 中添加橡胶骨料会降低强度,但会提高能量耗散能力。
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来源期刊
International Journal of Concrete Structures and Materials
International Journal of Concrete Structures and Materials CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL
CiteScore
6.30
自引率
5.90%
发文量
61
审稿时长
13 weeks
期刊介绍: The International Journal of Concrete Structures and Materials (IJCSM) provides a forum targeted for engineers and scientists around the globe to present and discuss various topics related to concrete, concrete structures and other applied materials incorporating cement cementitious binder, and polymer or fiber in conjunction with concrete. These forums give participants an opportunity to contribute their knowledge for the advancement of society. Topics include, but are not limited to, research results on Properties and performance of concrete and concrete structures Advanced and improved experimental techniques Latest modelling methods Possible improvement and enhancement of concrete properties Structural and microstructural characterization Concrete applications Fiber reinforced concrete technology Concrete waste management.
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