The investigating on mechanical properties of ultra-high strength and ultra-high ductility cementitious composites (UHS-UHDCC)

Lei, Dongyi; Guo, Liping; Liu, Ying; Zhang, Zheng; Liu, Jiaping; Li, Shaochun; Wang, Peng-Gang; Li, Changcheng; Mechtcherine, Viktor; Li, Zhihong; Zeng, De-Zhao; Zhong, Baomin

doi:10.1016/j.jobe.2021.102486

Cited by 12 publications

(5 citation statements)

References 30 publications

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“…This could be explained by the increased content of CR weakened the interfacial density of T-UHPAC and affects its bonding performance [2]. Additionally, excessive use of CR led to high plastic viscosity of the fresh mortar and significantly affects fibre dispersion [52,53]. Considering recycled steel fibres with different lengths and thicknesses were used in this study, they are more susceptible to irregular dispersion due to variations in plastic viscosity.…”

Section: Tensile Strength and Toughnessmentioning

confidence: 99%

Ultra-High-Performance Alkali-Activated Concrete: Effect of Waste Crumb Rubber Aggregate Proportions on Tensile and Flexural Properties

Li,

Chen,

Che

et al. 2024

Buildings

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The declining availability of natural sand resources and the significant carbon footprint associated with the extensive use of cement are posing severe limitations on the advancement and application of ultra-high-performance concrete (UHPC). In this study, waste tyre-derived recycled crumb rubber particles (CR) were employed to replace quartz sand, and an alkali-activated cementitious material was used to produce waste tyre-alkali-activated UHPC (T-UHPAC). The influence of different CR replacement ratios (0%, 5%, 20%, 35%, 50%) on the tensile and flexural performance of T-UHPAC was investigated, and a predictive model for the stress–strain response considering the CR replacement ratio was established. An optimization method for improving the tensile and flexural performance of T-UHPAC was proposed. The results indicate that the effect of rough-surfaced CR on the interfacial properties of concrete differs from that of smooth quartz sand. A CR replacement ratio exceeding 35% led to a reduction in both the tensile and flexural strengths of UHPAC, while a replacement ratio at or below 20% resulted in a superior tensile and flexural performance of T-UHPAC. The established predictive model for tensile performance accurately forecasts the stress–strain behaviour of T-UHPAC under varying CR replacement ratios, with the accuracy improving as the CR replacement ratio increases. By utilizing CR to replace quartz sand in proportions not exceeding 20%, the production of low-carbon UHPC with exceptional comprehensive mechanical properties is achievable. Moreover, the development of T-UHPAC through the comprehensive utilization of waste tyres presents a promising and innovative approach for the low-carbon and cost-effective production of UHPC, thereby facilitating the sustainable development of natural resources. This research represents a significant step towards the widespread adoption and application of UHPC and thus holds substantial importance.

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Section: Tensile Strength and Toughnessmentioning

confidence: 99%

Ultra-High-Performance Alkali-Activated Concrete: Effect of Waste Crumb Rubber Aggregate Proportions on Tensile and Flexural Properties

Li,

Chen,

Che

et al. 2024

Buildings

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“…Fig. 1 Performance of SHFRCC from the literature in terms of compressive-tensile strength and ductility in tension [19], [20], [21], [22], [23], [24], [25], [26], [27] MATEC Web of Conferences 361, 0 (2022) Concrete Solutions 2022 1006 https://doi.org/10.1051/matecconf/202236101006…”

Section: Selection Of Repair MIXmentioning

confidence: 99%

Restoration of existing historic concrete structures with PE fiber strain hardening cementitious composites

Konstantinou,

Georgiou,

Theodoulides

et al. 2022

MATEC Web Conf.

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Important historic buildings of the 20th century located in the seismogenic zones of the Mediterranean have been designed without the provisions of Eurocode 8; thus, they require strengthening to account for seismic excitations and to be rendered safe for use by future generations. A common disadvantage in historic concrete buildings is the insufficient or even null reinforcement in shear, which usually results in brittle shear failures. This research focuses on the use of a self-compacting, fiber reinforced cementitious composite, which can be applied as cover replacement, or in a thin layer around the perimeter of an existing column, thus providing confinement to the original core and increasing the shear strength of the structural member. Different mix designs prepared in various countries have been examined, all incorporating the use of industrial by-products, such as silica fume or fly ash. The aforementioned mixtures were replicated with the use of locally available raw materials at the laboratories of the University of Cyprus. Polyethylene (PE) fibers, with or without coating, measuring 12 and 18 mm in length were also included in the various mix designs. The mechanical properties of the hardened specimens were compared through compression, tension and flexure tests at 28 and 90 days of curing. Based on the results, a self-compacting mixture, presenting particularly high strengths in direct tension and bending, was eventually chosen to investigate the strengthening of existing historic concrete members.

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“…However, a decreasing tendency was exhibited for the 0.22-60% series. In general, the addition of fibers can result in two opposite (positive and negative) effects on the compressive properties [41][42][43]. On the one hand, the randomly distributed fibers can produce a strong lateral binding force and constrain lateral expansion of HDCCs, which restricts the rapid expansion of cracks and improves the composite compressive properties.…”

Section: Compressive Propertiesmentioning

confidence: 99%

“…e distinguishing feature is that the binding force generated by the fibers is an internal binding force, that generated by the stirrups is an external binding force, and the schematic on two kinds of binding force is shown in Figure 14 [42]. On the other hand, the addition of fibers in cementitious composites can be regarded as flaws, and some artificial pores can be more easily introduced due to the worse workability, which introduces a negative effect on the compressive properties [42,44]. Consequently, the compressive strength of HDCCs was dependent on the combined actions of these opposite aspects.…”

Section: Compressive Propertiesmentioning

confidence: 99%

Polyvinyl Alcohol Fiber Length Optimization for High Ductility Cementitious Composites with Different Compressive Strength Grades

Ding

Guo

Ren

et al. 2021

Advances in Materials Science and Engineering

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The fiber length has a significant impact on the fiber bridging capacity and the mechanical properties of high ductility cementitious composites (HDCCs), which is related to fiber/matrix interfacial bonding. However, this fundamental knowledge of HDCCs design has rarely been investigated systematically. To this end, this study deeply investigates the effect of the fiber length on the bridging stress and the complementary energy with various fiber/matrix interfacial bonds in theory. Then, the mechanical performances of HDCCs with various fiber lengths and compressive strengths were evaluated experimentally. In micromechanical design, longer fibers can achieve stronger bridging stress and more sufficient complementary energy regardless of the fiber/matrix interfacial bonding properties. However, it should be noted that the increase in bridging capacity was quite slow for the overlong fibers and excessive interfacial bonding. The experiments indicated that overlong fibers (18 mm and 24 mm) easily twined on the mixer blade and were hard to disperse evenly. The HDCCs with shorter fibers displayed better workability. The compressive strength was less affected by the fiber length, and most striking differences were less than 5.0%, while the flexural properties and the tensile properties first increased and then decreased when the fiber length ranged from 6 mm to 24 mm. Consequently, the fibers with lengths of 9 mm and the fibers with lengths of 12 mm were better candidates for the HDCCs with compressive strengths of 30 MPa to 80 MPa, and fibers with lengths of 9 mm caused the HDCCs to exhibit higher ductility properties in general.

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The investigating on mechanical properties of ultra-high strength and ultra-high ductility cementitious composites (UHS-UHDCC)

Cited by 12 publications

References 30 publications

Ultra-High-Performance Alkali-Activated Concrete: Effect of Waste Crumb Rubber Aggregate Proportions on Tensile and Flexural Properties

Ultra-High-Performance Alkali-Activated Concrete: Effect of Waste Crumb Rubber Aggregate Proportions on Tensile and Flexural Properties

Restoration of existing historic concrete structures with PE fiber strain hardening cementitious composites

Polyvinyl Alcohol Fiber Length Optimization for High Ductility Cementitious Composites with Different Compressive Strength Grades

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