Mechanical properties and microstructure of ultra-high-performance concrete with high elastic modulus

Chu, Hsin; Gao, Li; Qin, Jianjian; Jiang, Jinyang; Wang, Danqian

doi:10.1016/j.conbuildmat.2022.127385

Cited by 38 publications

(4 citation statements)

References 54 publications

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“…A glass microfiber, the characteristics of which are detailed in Table 2, was employed. This specific fiber type was selected due to its Young's modulus proximity with that of the ultra-high-performance concretes (40-60 GPa), a crucial factor in optimizing the compatibility and performance of the cement matrix-fiber composite [26]. Using fibers with a Young's modulus close to that of the concrete matrix helps to ensure that both the fibers and the matrix deform together under load.…”

Section: Starting Materials: Selection and Characterizationmentioning

confidence: 99%

Influence of Glass Microfibers on the Control of Autogenous Shrinkage in Very High Strength Self-Compacting Concretes (VHSSCC)

Onghero,

Souza,

Cusson

et al. 2024

J. Compos. Sci.

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High-performance concrete (HPC) is widely used in infrastructure for its durability and sustainability benefits. However, it faces challenges like autogenous shrinkage, leading to potential cracking and reduced durability. Fiber reinforcement offers a solution by mitigating shrinkage-induced stresses and enhancing concrete durability. In this sense, this study investigates the use of glass microfibers to mitigate autogenous shrinkage and early-age cracking in high-strength self-compacting concrete. Samples were prepared with two water-to-binder ratios (w/b): 0.25 and 0.32; and three glass microfiber contents: 0.20%, 0.25%, and 0.30 vol.%. The concrete mixtures were characterized in the fresh state for slump flow and in the hardened state for compressive strength, static, and dynamic Young’s modulus. Unrestrained and restrained shrinkage tests were also conducted in the seven days-age. The findings revealed that glass microfibers reduced the workability in mixtures with lower slump flow values (w/b of 0.25), while less viscous mixtures (w/b of 0.32) exhibited a slight improvement. Compressive strength showed a proportional enhancement with increasing fiber contents in concretes with a w/b ratio of 0.32. A contrasting trend emerged in concretes with a w/b ratio of 0.25, wherein strength diminished as fiber additions increased. The modulus of elasticity improved with fiber additions only in the matrix with a w/b ratio of 0.25, showing no correlation with compressive strength results. In shrinkage tests, the addition of glass microfibers up to specific limits (0.20% for a w/b ratio of 0.25 and 0.25% for w/b of 0.32) demonstrated improvements in controlling concrete deformation in unrestrained shrinkage analyses. Concerning cracking reduction in restrained concrete specimens, the mixtures did not exhibit significant improvements in crack prevention.

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Section: Starting Materials: Selection and Characterizationmentioning

confidence: 99%

Influence of Glass Microfibers on the Control of Autogenous Shrinkage in Very High Strength Self-Compacting Concretes (VHSSCC)

Onghero,

Souza,

Cusson

et al. 2024

J. Compos. Sci.

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“…The preparation principle of UHPC is the MAA theory and the maximum density theory [34,35], where Portland cement, river sand, silica fume, fly ash, SP and fibers are mixed together in tightly packed and maximum density theory. Based on the previous research results [31], the specific mixing mass ratio is: binder: sand: water: SP: fibers = 1240:992:200:14:195, where binder equals to the sum of the Portland cement, silica fume and Fly ash, which means that B/S = 1240/992 = 1.25, and W/B = 200/1240 = 0.16.…”

Section: Specimen Preparationmentioning

confidence: 99%

Effect of a Novel Vibration Mixing on the Fiber Distribution and Mechanical Properties of Ultra-High Performance Concrete

et al. 2022

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A novel double-axis vibration mixing technology is presented to further enhance the performance of ultra-high performance concrete (UHPC). It improves the problem of inefficient zone in concrete mixing and enhances the homogeneity of concrete through the coupling of vibration and velocity fields during mixing. The X-CT scan results demonstrate that this novel technology improves the fiber distribution coefficient from 0.512 to 0.581. Moreover, the standard deviation of fiber orientation is reduced, the proportion of invalid fibers is decreased, and the pore space distribution is more uniform. The mechanical experimental results show that the new vibration mixing technology improves the mechanical properties of UHPC, and the percentage of early strength improvement is more significant; the impact compressive strength and the toughness of UHPC are also strengthened. The vibration mixing technology is expected to achieve the reduction of raw materials dosage with the same mechanical properties to reduce the cost and carbon emission.

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“…Ultrahigh-Performance Concrete (UHPC), as an emerging cement-based composite construction material, has excellent mechanical properties and durability that make it widely used in road and bridge projects [1]. The high modulus of elasticity guarantees that UHPC bridge deck panels, even with reduced thickness, will not exhibit substantial deformation when subjected to external forces, thereby optimizing the outstanding mechanical characteristics inherent to UHPC [2]. Due to the extremely low water-cement ratio and high cementitious material admixture of UHPC, its early self-shrinkage is much larger than that of normal concrete [3].…”

Section: Introductionmentioning

confidence: 99%

Coupling Effect of Expansion Agent and Internal Curing Aggregate on Shrinkage of High-Modulus Ultra-High-Performance Concrete

Zhou,

Yang,

et al. 2023

Coatings

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In the realm of bridge structural engineering, it is customary to meticulously contemplate the material’s strength and rigidity attributes during the dimensioning phase. In recent years, there has been a burgeoning interest in employing Ultrahigh-Performance Concrete (abbreviated as UHPC) for the construction of bridge decks and wet joints. However, the large self-shrinkage of UHPC can easily lead to shrinkage cracking and affect its service life. This study delves into the utilization of a blend of basalt coarse aggregate and high-modulus aggregate (HMA) in the formulation of Ultrahigh-Performance Concrete (UHPC) with the objectives of achieving exceptional strength (>180 MPa), superior modulus of elasticity (>56 GPa), and synergistic effect of using prewetted internal curing aggregate (ICA), metallurgical ore sand (MOS), and calcium–magnesium composite-based expansion agent (EA) to reduce the shrinkage of UHPC. Furthermore, the mechanical properties, shrinkage, hydration process, and microstructure of UHPC prepared with EA and ICA were studied. The results show that UHPC prepared with both 3% EA and 20% ICA had the optimal volume stability (the shrinkage was only 273 με at 180 d). In contrast, the 180 d shrinkage of UHPC with 3% EA and 20% ICA separately was 287 με and 373 με, respectively. In addition, the incorporation of EA and ICA can effectively improve the flexural strength of UHPC, although it affects the compressive strength and modulus of elasticity of UHPC (small decrease).

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Mechanical properties and microstructure of ultra-high-performance concrete with high elastic modulus

Cited by 38 publications

References 54 publications

Influence of Glass Microfibers on the Control of Autogenous Shrinkage in Very High Strength Self-Compacting Concretes (VHSSCC)

Influence of Glass Microfibers on the Control of Autogenous Shrinkage in Very High Strength Self-Compacting Concretes (VHSSCC)

Effect of a Novel Vibration Mixing on the Fiber Distribution and Mechanical Properties of Ultra-High Performance Concrete

Coupling Effect of Expansion Agent and Internal Curing Aggregate on Shrinkage of High-Modulus Ultra-High-Performance Concrete

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