Ultra-high performance concrete: From fundamental to applications

Azmee, Norzaireen Mohd; Shafiq, Nasir

doi:10.1016/j.cscm.2018.e00197

Cited by 185 publications

(138 citation statements)

References 38 publications

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“…This superior mechanical and durability performance of UHPFRC makes it particularly suitable for use in new constructions and thin layers/jackets for strengthening and waterproofing of existing reinforced concrete structures, particularly when exposed to aggressive environments, where the durability requirements can be even more demanding than the mechanical ones (Azmee and Shafiq 2018). Indeed, a promising field of application is the rehabilitation and strengthening of reinforced concrete structures, in which a new layer of UHPFRC replaces the deteriorated concrete (cracked, carbonated, chloride attacked).…”

Section: Introductionmentioning

confidence: 99%

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Matos

Nunes

Aguiar

2019

ACT

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The primary goal of the present paper is to investigate the influence of cracking on water transport by capillary suction of UHPFRC. Prismatic specimens were firstly loaded under four-point bending up to specific crack open displacement (COD). Target COD, under loading, was varied between 200 and 400 μm, in steps of 50 μm. After unloading, a COD recovery was observed with residual COD ranging between 116-334 µm and 75-248 μm for UHPFRC-1.5% and UHPFRC-3.0% specimens, respectively. The crack pattern created was characterised (number of cracks and crack width) before capillarity testing. Sorptivity results of cracked UHPFRC-1.5% and UHPFRC-3% specimens remained in the range of 0.024 to 0.044 mg/(mm 2 .min 0.5), which are about 2 to 4 times higher than the sorptivity results of noncracked UHPFRC specimens. However, the maximum sorptivity observed on cracked UHPFRC is relatively low as compared to typical sorptivity results found in good quality conventional concrete or engineered cementitious composites (ECC).

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Section: Introductionmentioning

confidence: 99%

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Matos

Nunes

Aguiar

2019

ACT

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“…Ultra-high performance concrete (UHPC) has been in the interest of research with different range of applications for bridge construction, repair and rehabilitation, overlays, building, petroleum industry, hydraulic structures, and architectural components [1,2]. UHPC is developed by the inspiration of three concrete technologies: self-compacting concrete (SCC), high-performance concrete (HPC), and fibre reinforced concrete (FRC) with a high compressive strength that is higher than 126 MPa (18 ksi) and post-cracking tensile strength of more than 5 MPa (0.7 ksi) [1,[3][4][5][6][7]. UHPC with a different mix design model is a combination of portland cement, sand, quartz powder, silica fume, superplasticizer, water, and steel fibres [4,[8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Concrete-to-UHPC Bond Strength

et al. 2020

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Ultra-High Performance Concrete (UHPC) has been a material of interest for retrofitting reinforced concrete elements because of its pioneer mechanical and material properties. Numerous experimental studies for retrofitting concrete structures have shown an improvement in durability performance and structural behaviour. However, conservative and sometimes erroneous estimates for bond strength are used for numerically calculating the strength of the composite members. In addition, different roughening methods have been used to improve the bond mechanism; however, there is a lack of numerical simulation for the force transfer mechanism between the concrete substrate and UHPC as a repair material. This paper presents an experimental and numerical programme designed to characterize the interfacial properties of concrete substrate and its effect on the bond strength between the two materials. The experimental programme evaluates the bond strength between the concrete substrates and UHPC with two different surface preparations while using bi-surface test and additional material tests, including cylinder and cube tests for compression property, direct tension test, and flexural test to complement UHPC tensile properties. Non-linear finite element analysis was conducted, which uses a numerical zero thickness volume model to define the interface bond instead of a traditional fixed contact model. The numerical results from the zero thickness volume model show good agreement with the experimental results with a reduction in error by 181% and 24% for smooth and rough interface surfaces if compared to the results from the model with a fixed contact.

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“…Fibre Reinforced Cementitious Composites are special among building materials because of its strength characteristics and ductile nature. The recent researches mainly concentrated on developing Ultra High Performance Composites (UHPC) which possesses high strength as well as better durability characteristics [1]. The effect of proportion is considerable in attaining these characteristics [2].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Lime Powder Blended Cementitious Composites

Sreekumaran¹,

Kaverikalaimani²,

K.³

2019

IJITEE

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Cementitious composites are well known for its reasonable strength and high ductility. The recent trends were in developing High Performance Cementitious Composites (HPC) which possesses better strength and durability properties. For achieving high performance, it consumes more cement and the water-binder ratio will be considerably low. That is, only a part of the total cement content will be taking part in hydration and the remaining will be acting as fillers in the mixes. This study aimed to reduce the cost of the mix by replacing this filler part of the cement by locally available lime powder without compromising its strength. Also, accelerated curing such as steam curing is required for the achievement of high strength at the early stages. In this study, normal water curing was adopted to mimic the actual site conditions. The base mix of the composite was developed by replacing 30% of the cement with lime powder. The mix was then reinforced with 0.5%, 1%, 1.5% and 2% crimped fibres by volume. Strength characteristics were studied along with the resistance to damage under low velocity impact test. It was observed that, under the normal water curing, strength development was at low rate and the 28 day strength was considerably less. Addition of fibres helped in improving strength and the better results were shown by the mix reinforced with 2% steel fibres by volume.

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Ultra-high performance concrete: From fundamental to applications

Cited by 185 publications

References 38 publications

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Capillary Transport of Water in Cracked and Non-cracked UHPFRC Specimens

Numerical Modelling of Concrete-to-UHPC Bond Strength

Mechanical Properties of Lime Powder Blended Cementitious Composites

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