Effects of coarse aggregate and steel fibre contents on mechanical properties of high performance concrete

Xu, Lihua; Wu, Fanghong; Chi, Yin; Cheng, Peng; Zeng, Yanqin; Chen, Qian

doi:10.1016/j.conbuildmat.2019.01.190

Cited by 93 publications

(23 citation statements)

References 49 publications

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“…BS 5400-6 gave a flexural stiffness about 2.7% higher than the value obtained from testing, and AISC/LRFD gave an initial flexural stiffness about 2.3% lower than the test results. It can be seen from Figure 14a that the predictions provided using Equation (6), proposed in this paper, were in good agreement with the experimental results, making it acceptable for the calculation of the initial flexural stiffness of CA-UHPCFST members. The prediction obtained using Equation ( 7) provides the most accurate estimation for the serviceability-level flexural stiffness, with a mean value of 0.997 and a COV of 0.085.…”

Section: Design Codes Formulasupporting

confidence: 71%

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Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes

Zeng

et al. 2021

Materials

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This paper presents an experimental investigation of flexural behavior of circular ultra-high-performance concrete with coarse aggregate (CA-UHPC)-filled steel tubes (CA-UHPCFSTs). A total of seven flexural members were tested under a four-point bending load. The failure modes, overall deflection curves, moment-versus-curvature relationships, moment-versus-strain curves, strain distribution curves, ductility, flexural stiffness and ultimate flexural capacity were evaluated. The results indicate that the CA-UHPCFSTs under bending behaved in a good ductile manner. The CA-UHPC strength has a limited effect on the ultimate flexural capacity, while the addition of steel fiber can improve the ultimate flexural capacity. Increasing the steel tube thickness leads to higher flexural stiffness and ultimate flexural capacity. There is a significant confinement effect between the steel tube and the CA-UHPC core in the compressive zone and centroidal plane after the specimen enters the elastic-plastic stage, while the confinement effect in the tensile zone is minimal. Moreover, the measured flexural stiffness and ultimate flexural capacity were compared with the predictions using various design specifications. Two empirical formulas for calculating the initial and serviceability-level flexural stiffness of CA-UHPCFSTs are developed. Further research is required to propose the accurate design formula for the ultimate flexural capacity of CA-UHPCFSTs.

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Section: Design Codes Formulasupporting

confidence: 71%

“…The flexural stiffness formulas of various codes are listed in Table 6. Furthermore, on the basis of Equation ( 5), the initial flexural stiffness of circular CA-UHPCFSTs was acquired by fitting the experimental results, as shown in Equation (6).…”

Section: Comparisons Of Flexural Stiffnessmentioning

confidence: 99%

Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes

Zeng

et al. 2021

Materials

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“…Using a coarser aggregate can result in better distribution of macro hooked-end fibres than when introduced to a fine-grained mix [21]. However, the distribution of micro fibres is negatively impacted by the use of coarser aggregate, and also the fibre-matrix bonding of micro fibres have been found weakened [43].…”

Section: Flexural Tensile Strength and Behaviourmentioning

confidence: 99%

“…Consequently, it was more difficult to cast, which might have given an adverse effect on the flexural performance by influencing the homogeneity and compactability of the matrix, and the fibre distribution. Secondly, the size of the aggregate differed (Figure 2) which might have caused more defects and pores, poorer distribution of micro fibres and weakened the bonding between the micro fibres and the matrix [43]. Thirdly, the particle packing of the aggregate also differs between the mixes.…”

Section: Flexural Tensile Strength and Behaviourmentioning

confidence: 99%

Locally Produced UHPC: The Influence of Type and Content of Steel Fibres

Larsen

Thorstensen

2021

Nordic Concrete Research

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Ultra-high performance concrete might be a competitive alternative to normal concrete for some purposes. But despite research efforts during decades, utilisation is still not widespread. Reasons include limited competence and material availability. This paper presents one step of a research initiative aimed at facilitating the use of UHPC in Norway. The step presented here comprises the accumulated results from investigations on the influence steel fibres (content, type, and hybrid combination) have on material strength and deformation behaviour of locally produced UHPC, made with constituents found in southern Norway. 231 specimens were tested, spanning nine UHPC mixes. Digital Image Correlation (DIC) was successfully used to study crack propagation. Compressive strength of 166 MPa and E-modulus of 46 GPa were obtained, not being influenced by fibre content. The flexural tensile strength was found to be strongly dependent on variations in steel fibre properties and mix design. The highest flexural tensile strength was obtained for prisms with micro straight steel fibres alone, or in 50% combination with macro hooked-end fibres. The experimental results are considered in a theory-informed discussion. Suggestions are made on the use of steel fibres in locally produced UHPC, potentially lowering the cost by 30%.

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“…A inovação da construção civil se da por meio do desenvolvimento de novos materiais e novas tecnologias, com a finalidade de tornar as estruturas mais leves e duráveis. O Ultra High Performance Concrete (UHPC) possui resistência à compressão superior a 150 MPa e uma microestrutura muito densa, quase que impermeável (XU et al, 2019). A união de bom desempenho mecânico e microestrutura altamente densa favorece a utilização desse tipo de concreto em estruturas, em estruturas especiais, em ambientes com alta agressividade ambiental e como reforço de estruturas deterioradas (FEHLING et al, 2014).…”

Section: Introductionunclassified

Durabilidade do UHPC e UHPFRC contendo metacaulim

França¹,

Medeiros²,

́alverne³

2021

Congresso Internacional Sobre Patologia E Reabilitação Das Construções

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Concrete (UHPC) apresenta elevada resistência à compressão, tração, durabilidade, elevado módulo de elasticidade, baixa porosidade e permeabilidade. As estruturas de UHPC são mais leves quando comparadas com estruturas de concreto armado e protendido. Embora o custo inicial do UHPC seja elevado devido o alto consumo de cimento e fibras metálicas, a adição de materiais cimentícios secundários tende a diminuir o consumo de cimento e é uma opção sustentável. O UHPC é amplamente utilizado na Europa, Canadá e China em estruturas como pontes, passarelas, aranha-céus e reabilitação estrutural. Por ter uma microestrutura densa, o UHPC apresenta bom comportamento frente a penetração da água e agentes agressivos ao concreto e a armadura passiva. Nesse sentido, no presente trabalho foi analisado a absorção por capilaridade em corpos de prova cilíndricos de 5 cm de diâmetro e 10 cm de altura. Foi estudado a capilaridade no UHPC e no Ultra High Performance Fiber Reinforced Concrete (UHPPFC), sendo observado que a ordem dos materiais adicionados na argamassadeira afeta a trabalhabilidade e a resistência à compressão. Além disso, a adição de fibras pouco influenciou na absorção por capilaridade e a variação da massa permaneceu, quase que constante, no UHPC e UHPFRC. Os resultados obtidos já eram esperados, pois a microestrutura do UHPC possui poucos vazios, desse modo é praticamente impermeável.

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Effects of coarse aggregate and steel fibre contents on mechanical properties of high performance concrete

Cited by 93 publications

References 49 publications

Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes

Experimental Investigation of Flexural Behavior of Ultra-High-Performance Concrete with Coarse Aggregate-Filled Steel Tubes

Locally Produced UHPC: The Influence of Type and Content of Steel Fibres

Durabilidade do UHPC e UHPFRC contendo metacaulim

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