Fundamental insights into the compressive and flexural response of binder- and aggregate-optimized ultra-high performance concrete (UHPC)

Arora, Aashay; Yao, Yiming; Mobasher, Barzin; Neithalath, Narayanan

doi:10.1016/j.cemconcomp.2019.01.015

Cited by 98 publications

(26 citation statements)

References 46 publications

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“…Several researchers have reported that the degree of cement hydration and the particle packing density of the matrix play important roles in the strength development of UHPC [26,34,35]. Our results confirmed that ultra-fine spherical particles can enhance the compressive strength of UHPG [34][35][36][37]. Table 5 lists the abrasion test results obtained at 7 and 28 days.…”

Section: Compressive Strengthsupporting

confidence: 83%

The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout

et al. 2021

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In this study, ultra-fine spherical particles of silica fume and reactive ultra-fine fly ash were added to a mixture of commercial ultra-high-performance grout (UHPG) with the aim of enhancing the rheological properties, compressive strength, compactness, and permeability. This commercial UHPG study was conducted in collaboration with Triaxis Corporation (Changsha city, Hunan province, China). A water-to-binder ratio of 0.21 and a binder-to-fine aggregates ratio of 1.17 were used as fixed parameters, and the binders were a combination of type-II Portland cement, sulphoaluminate cement, silica fume, and reactive ultra-fine fly ash (RUFA). Polycarboxylate superplasticizer powder was used to control the rheology. The results revealed excellent compressive strength, volume stability, and resistance to chloride penetration. Mercury intrusion porosimetry and scanning electron microscopy tests revealed that the medium-sized RUFA particles with small silica fume particles completely filled the spaces between large cement particles to achieve optimal densification. This mixture also produced dense hydration and calcium-silicate-hydrates colloids, which filled the microstructures of the UHPG resulting in excellent engineering properties and durability. This commercially available UHPG mix responded to excellent compressive strengths approaching 120 MPa and exhibited good workability with a loss of slump-flow rate up to 33% after 60 min. It also exhibited very low abrasion resistance (0.5%), stable shrinkage and expansion rates (stabilization over 10 days), very low chloride diffusion coefficient (less than 0.1 × 10−14 m2/s) with a denser microstructure. This commercial UHPG (UHPG-120) has been developed to meet the needs of the market.

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Section: Compressive Strengthsupporting

confidence: 83%

The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout

et al. 2021

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“…As can be seen, by increasing the fibre content, the viscosity of the geopolymer improved significantly and the addition of the long fibres had a more noteworthy influence on the flow. The regression study disclosed that there was a linear relationship between the volume fraction of the fibre and flow rate of the geopolymer, shown as Equations ( 10)- (13). Additionally, the correlation coefficients between the two were also good; most of them were about 0.9.…”

Section: Workabilitiesmentioning

confidence: 85%

“…Nevertheless, as Portland cement-based composites, geopolymers display brittle failure resulting from their low tensile strength that could enforce some restrictions in potential engineering application. Conventionally, Portland cement-based composites are reinforced by the inclusion of fibres manufacturing concrete with a toughness performance [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Hence, different kinds of fibres have been used to reinforce geopolymers [ 14 , 15 , 16 , 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Polypropylene Fibre Factor on Flowability and Mechanical Properties of Self-Compacting Geopolymer

Liu

et al. 2021

Materials

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The possibility of using geopolymer instead of Portland cement could effectively reduce carbon dioxide emissions from cement manufacturing. Fibre-reinforced self-compacting geopolymers have great potential in civil engineering applications, such as chord member grouting for concrete-filled steel tubular truss beams. However, to the best of the authors’ knowledge, the quantitative relationship between FF and the properties of the fibre-reinforced geopolymer has been rarely reported. In this research, 26 groups of mixtures were used to study the influence of the polypropylene fibre factor (FF) on the flowability and mechanical properties and also the compactness of the fibre-reinforced self-compacting geopolymer. At the same volume fraction, geopolymers with long fibres present worse flowability than those having short fibres due to the easier contacting of long fibres. By growing the FF the influence of fibre addition on the V-funnel flow rate is more significant than the slump spread. This can be ascribed to the consequence of fibre addition and friction by the V-funnel which estimates the restrained deformability. For FF lesser than critical factor Fc = 100, influence of fibres is negligible and fibres are far apart from each other and, thus, they cannot restrict cracking under load and transfer the load to improve the mechanical properties. For FF between the Fc = 100 and density factor Fd = 350, a noteworthy enhancement of mechanical properties was obtained and the geopolymer was still adequately workable to flow by weight of self, without any symbols of instability and fibre clumping. Under this condition, better fibre dispersal and reinforcing productivity can lead to better hardened properties. For FF higher than Fd = 350, fibres tend to come to be entwined together and form clumping resulting from the fibre balling, resulting in worse hardened properties. This research offers a sensible basis for the application of the workability regulator of the fresh properties of fibre-reinforced geopolymer as an operative way to basically obtain ideal mechanical properties.

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“…The strain of specimens was measured by digital image correlation (DIC). DIC is a reliable non-destructive method based on speckle tracking and is used to analyse the full displacement field on the surface of specimens by digital images [39][40][41].…”

Section: Compressive Tensile and Flexural Strength Tests Setupmentioning

confidence: 99%

Flexural Behaviour and Evaluation of Ultra-high-performance Fibre Reinforced Concrete Beams Cured at Room Temperature

Huang

Khan

et al. 2021

Preprint

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In the present study, specimens with four different dimensions and concrete beams with six different reinforcement ratios were prepared to investigate the properties and flexural behaviour of ultra-high-performance fibre reinforced concrete (UHPFRC) cured at 20 ºC. The standard cubic compressive strength of UHPFRC specimens cannot be achieved at curing temperature of 20 ºC. For UHPFRC beams, the bearing capacity under flexure was enhanced with the increase of reinforcement ratio. The failure modes of UHPFRC beams changed from ductile to brittle as the reinforcement ratio increased from 1.26–9.50%. Moreover, the ductility of UHPFRC beams decreased with the increase of reinforcement ratio from 1.26–9.50%. The flexural behaviour of UHPFRC beams cured at room temperature was in accordance with the UHPFRC beams cured at high temperature in previous studies. In addition, the calculation model of CECS38-2004 underestimated the bending moment capacity of the under-reinforced UHPFRC beams (with reinforcement ratio from 0–7.85%) and overestimated the bending moment capacity of the UHPFRC beams with high reinforcement ration of 9.50%.

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Fundamental insights into the compressive and flexural response of binder- and aggregate-optimized ultra-high performance concrete (UHPC)

Cited by 98 publications

References 46 publications

The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout

The Effect of Incorporating Ultra-Fine Spherical Particles on Rheology and Engineering Properties of Commercial Ultra-High-Performance Grout

Influence of Polypropylene Fibre Factor on Flowability and Mechanical Properties of Self-Compacting Geopolymer

Flexural Behaviour and Evaluation of Ultra-high-performance Fibre Reinforced Concrete Beams Cured at Room Temperature

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