Static mechanical properties and mechanism of C200 ultra-high performance concrete (UHPC) containing coarse aggregates

Yujing, Lv; Zhang, Wenhua; Wu, Fan; Wu, Peipei; Weizhao, Zeng; Fenghao, Yang

doi:10.1515/secm-2020-0018

Cited by 34 publications

(5 citation statements)

References 24 publications

(27 reference statements)

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“…As a result of GGBS replacement, the Ca(OH) 2 peaks reduced and almost disappeared in the case of high-volume replacement (60%). This implies that most of the Ca(OH) 2 present in UHPC was consumed by the pozzolanic reactions in concordance with the literature [28,29]. Moreover, some of the peaks related to unreacted cement particles also vanished with an increase in replacement ratio.…”

Section: Xrd Findingssupporting

confidence: 89%

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Yalçınkaya

Çopuroğlu

2021

Journal of Building Engineering

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Ultra-high performance concrete (UHPC) is an innovative cement-based composite with high mechanical performance under tensile and compressive loads, extremely low permeability, and excellent durability. Because of these features, UHPC has the potential to contribute to the development of new architectural perspectives and structural systems with prolonged service life; therefore, it is anticipated that the use of UHPC in cast-in-situ applications will increase in the near future. As a result of its high Portland cement dosage, the hydration heat of UHPC can be relatively high compared to that of conventional concrete. Thus, ground granulated blast furnace slag (GGBS) can be used in UHPC formulation for reducing Portland cement dosage thereby limiting hydration heat while also addressing ecological and engineering concerns. In the scope of this study, the effects of GGBS replacement (0%, 30%, and 60%) on the hydration heat, strength, and microstructural characteristics of UHPC were studied. Results showed that GGBS-bearing UHPCs are more sensitive to ambient temperature in respect to cumulative heat. 60% GGBS replacement reduced cumulative heat release by 36% and 28% at 20 • C and 35 • C respectively. So, the benefit of GGBS on reducing hydration heat is less pronounced in hot weather. Performance differences in strength depending on the replacement ratio were only noticeable on the first day of curing. Prolonged curing time and fiber inclusion eliminated strength differences. Microstructural investigations indicated that Ca(OH) 2 can be lowered up to 0.5%, and the Ca/Si ratio of the C-S-H phase was reduced below the value of 1.0 after 90 days of curing as a result of GGBS replacement.

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Section: Xrd Findingssupporting

confidence: 89%

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Yalçınkaya

Çopuroğlu

2021

Journal of Building Engineering

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“…These results are similar to those of UPHCs with ultra-fine particulate binders [60,61]. The cumulative intrusion was significantly lower than that of UHPC containing fibers [62][63][64]. These results confirmed that silica fume has higher pozzolanic activity and faster reaction in the early stages, whereas the filler effects and superior pozzolanic activity of RUFA tend to refine the pore structure of UHPG mixtures at later stages.…”

Section: Observations Of Microstructuresupporting

confidence: 78%

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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“…The values from this test indicate the quality of the mixture in terms of density, homogeneity and uniformity [41] [58]. Yujing et al [71] pointed that UPHC with pozzolanic materials promotes a pore medium size reduction, and thus, the material is denser than conventional concretes and UPHC with lower pozzolanic materials content.…”

Section: Ultrasonic Pulse Velocitymentioning

confidence: 99%

Assessment of the impact of adding fly ash and coal bottom ash to an advanced cement-based composite matrix

Vieira

Pereira

Pacheco

et al. 2022

Rev. IBRACON Estrut. Mater.

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To reduce environmental impact and hydration heat from high cement consumption in advanced cement-based composites, this study proposes the partial cement substitution by fly ash (FA) and coal bottom ash (CBA) in rates of 15% by mass (7.5% FA and 7.5% CBA) and 30% by mass (15% FA and 15% CBA). Matrixes were assessed for their physical and mechanical characteristics though the tests of compressive strength, capillary water absorption and ultrasonic pulse velocity, added to the analysis of images generated by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Results indicated better performance of fly ash due to its particle size, shape and texture, especially for the rate of 15%. In terms of compressive strength, mixture RFA15 yielded the highest strength. The capillary water absorption results were linear and with low variations of about 1% and 5% between 28 and 56 days.

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Static mechanical properties and mechanism of C200 ultra-high performance concrete (UHPC) containing coarse aggregates

Cited by 34 publications

References 24 publications

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

Hydration heat, strength and microstructure characteristics of UHPC containing blast furnace slag

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

Assessment of the impact of adding fly ash and coal bottom ash to an advanced cement-based composite matrix

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