Evaluation of modulus of elasticity of ultra-high performance concrete

Alsalman, Ali; Dang, Canh N.; Prinz, Gary S.; Hale, William

doi:10.1016/j.conbuildmat.2017.07.158

Cited by 163 publications

(46 citation statements)

References 10 publications

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“…Therefore, the optimum concentration of GO to be mixed in RS-UHPC is 0.05 wt.%, from the perspective of the elastic modulus. The elastic modulus of the RS-UHPC sample prepared in this study ranged from 41.96 to 47.10 GPa, which exceeds the value for UHPC prepared from recycled sand [ 58 ] and is comparable to that for UHPC prepared from river sand [ 59 ], but is slightly lower than that of UHPC produced by Aeolian sand [ 60 ]. Ordinary concrete is generally composed of aggregates, a cement slurry, and an interface transition zone.…”

Section: Resultsmentioning

confidence: 67%

Effect of Graphene Oxide on Mechanical Properties and Durability of Ultra-High-Performance Concrete Prepared from Recycled Sand

et al. 2020

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Ultra-high-performance concrete (UHPC) has been used as an advanced construction material in civil engineering because of its excellent mechanical properties and durability. However, with the depletion of the raw material (river sand) used for preparing UHPC, it is imperative to find a replacement material. Recycled sand is an alternative raw material for preparing UHPC, but it degrades the performance. In this study, we investigated the use of graphene oxide (GO) as an additive for enhancing the properties of UHPC prepared from recycled sand. The primary objective was to investigate the effects of GO on the mechanical properties and durability of the UHPC at different concentrations. Additionally, the impact of the GO additive on the microstructure of the UHPC prepared from recycled sand was analysed at different mixing concentrations. The addition of GO resulted in the following: (1) The porosity of the UHPC prepared from recycled sand was reduced by 4.45–11.35%; (2) the compressive strength, flexural strength, splitting tensile strength, and elastic modulus of the UHPC prepared from recycled sand were enhanced by 8.24–16.83%, 11.26–26.62%, 15.63–29.54%, and 5.84–12.25%, respectively; (3) the resistance of the UHPC to penetration of chloride ions increased, and the freeze–thaw resistance improved; (4) the optimum mixing concentration of GO in the UHPC was determined to be 0.05 wt.%, according to a comprehensive analysis of its effects on the microstructure, mechanical properties, and durability of the UHPC. The findings of this study provide important guidance for the utilisation of recycled sand resources.

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Section: Resultsmentioning

confidence: 67%

Effect of Graphene Oxide on Mechanical Properties and Durability of Ultra-High-Performance Concrete Prepared from Recycled Sand

et al. 2020

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“…Cement-based materials have been widely used in civil engineering because of their superb compressive strength and locally available supply of raw materials. However, the brittleness incurred from the high modulus of elasticity of cement-based materials have hindered their applications in certain areas where some level of ductility, in particular, damping property, is required [1][2][3][4][5]. Asphalt is a flexible material with excellent deformation capacity.…”

Section: Introductionmentioning

confidence: 99%

Retardation mechanism of anionic asphalt emulsion on the hydration of Portland cement

Hong²,

Zhu³

et al. 2018

Construction and Building Materials

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Cement-asphalt (CA) mortar, a grouting material consisting of Portland cement (PC), asphalt emulsion, sand, water and other related admixtures, has been widely used as a cushion layer material in 11 the construction of High-Speed Railways (HSR) during the past decade in China due to its excellent damping property. The fresh and hardened properties of CA mortar are closely related to the PC hydration in the presence of asphalt emulsion. However, the retardation effect introduced by the anionic asphalt emulsion on the hydration process of PC has not been fully understood. In this paper, the effect of an anionic asphalt emulsion on the early hydration process of CA paste was first investigated by setting time test, isothermal conduction calorimeter and electrical resistivity. The MIP and SEM were then employed to characterize the microstructure evolution of the CA paste. Based on the data and observation obtained from the experimental study, three possible retardation mechanisms introduced by the anionic asphalt emulsion on the PC hydration were then assessed in this paper, including (i) selective adsorption by anionic emulsifier via electrostatic attraction, (ii) coating formed by the demulsification of anionic asphalt emulsion, and (iii) reduced reactivity of water molecules in anionic asphalt emulsion.

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“…However, this difference is small, not exceeding 6%. This low influence on the modulus of elasticity is also reflected in the results obtained by Alsalman [30], when substituting sand with fly ash. According to the author, this may be due to an excess of fly ash, which makes it impossible for 100% of these particles to be hydrated.…”

Section: Compressive Strengthmentioning

confidence: 67%

Use of Mining Waste to Produce Ultra-High-Performance Fibre-Reinforced Concrete

et al. 2020

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This research work analyses the influence of the use of by-products from a fluorite mine to replace the fine fraction of natural aggregates, on the properties of Ultra-High-Performance Fibre-Reinforced Concrete (UHPFRC). Replacing natural aggregates for different kinds of wastes is becoming common in concrete manufacturing and there are a number of studies into the use of waste from the construction sector in UHPFRC. However, there is very little work concerning the use of waste from the mining industry. Furthermore, most of the existing studies focus on granite wastes. So, using mining sand waste is an innovative alternative to replace natural aggregates in the manufacture of UHPFRC. The substitutions in this study are of 50%, 70% and 100% by volume of 0–0.5 mm natural silica sand. The results obtained show that the variations in the properties of consistency, compressive strength, modulus of elasticity and tensile strength, among others, are acceptable for substitutions of up to 70%. Therefore, fluorite mining sand waste is proved to be a viable alternative in the manufacturing of UHPFRC.

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Evaluation of modulus of elasticity of ultra-high performance concrete

Cited by 163 publications

References 10 publications

Effect of Graphene Oxide on Mechanical Properties and Durability of Ultra-High-Performance Concrete Prepared from Recycled Sand

Effect of Graphene Oxide on Mechanical Properties and Durability of Ultra-High-Performance Concrete Prepared from Recycled Sand

Retardation mechanism of anionic asphalt emulsion on the hydration of Portland cement

Use of Mining Waste to Produce Ultra-High-Performance Fibre-Reinforced Concrete

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