Effectiveness of multiscale hybrid fiber reinforced cementitious composites under single degree of freedom hydraulic shaking table

Cao, Mingli; Khan, Mehran

doi:10.1002/suco.201900228

Cited by 53 publications

(39 citation statements)

References 47 publications

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“…Variables for UHSC include the cement content, the water content, the additive material content, the fiber content (e.g., steel fibers), the content and type of admixtures, and aggregates content and type (e.g., superplasticizer) [ 5 , 6 , 7 ]. The addition of dispersed short-discrete fibers to concrete increased crack resistance and improved mechanical characteristics [ 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Steel fibers are employed to increase the toughness and post-cracking behavior of the cementitious material [ 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Compressive Strength Evaluation of Ultra-High-Strength Concrete by Machine Learning

et al. 2022

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In civil engineering, ultra-high-strength concrete (UHSC) is a useful and efficient building material. To save money and time in the construction sector, soft computing approaches have been used to estimate concrete properties. As a result, the current work used sophisticated soft computing techniques to estimate the compressive strength of UHSC. In this study, XGBoost, AdaBoost, and Bagging were the employed soft computing techniques. The variables taken into account included cement content, fly ash, silica fume and silicate content, sand and water content, superplasticizer content, steel fiber, steel fiber aspect ratio, and curing time. The algorithm performance was evaluated using statistical metrics, such as the mean absolute error (MAE), root mean square error (RMSE), and coefficient of determination (R2). The model’s performance was then evaluated statistically. The XGBoost soft computing technique, with a higher R2 (0.90) and low errors, was more accurate than the other algorithms, which had a lower R2. The compressive strength of UHSC can be predicted using the XGBoost soft computing technique. The SHapley Additive exPlanations (SHAP) analysis showed that curing time had the highest positive influence on UHSC compressive strength. Thus, scholars will be able to quickly and effectively determine the compressive strength of UHSC using this study’s findings.

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Section: Introductionmentioning

confidence: 99%

Compressive Strength Evaluation of Ultra-High-Strength Concrete by Machine Learning

et al. 2022

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“…1 The fibers in concrete restricted the crack propagation, crack extension and resulted in more strain capacity than that of PC. [2][3][4][5][6][7] The compressive stress-strain response is as an important factor for the evaluation of toughness level. 8 Furthermore, hybrid fiber reinforced concrete (HyFRC) was used to achieve an efficient improvement in the compressive behavior as well as the crack resistance from micro to macro-level.…”

Section: Introductionmentioning

confidence: 99%

“…The incorporation of fibers in plain concrete (PC) played an important role in the post‐peak response of compressive stress–strain curve 1 . The fibers in concrete restricted the crack propagation, crack extension and resulted in more strain capacity than that of PC 2–7 . The compressive stress–strain response is as an important factor for the evaluation of toughness level 8 .…”

Section: Introductionmentioning

confidence: 99%

Hybrid fiber concrete with different basalt fiber length and content

Khan

Cao

Xie

et al. 2021

Structural Concrete

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The concrete undergoes brittle failure, which is a disadvantage for stability and safety analysis. This drawback was compensated by addition of different types and size of fibers for improving the compressive and fracture characteristics. The incorporation of multi‐scale hybrid fibers in concrete showed enhanced performance at multi‐level than that of single type or size of fiber. This study examined the influence of basalt fiber length (12, 25, 37, and 50 mm) and content (0.15% and 0.3%) on compressive and fracture parameters of hybrid fiber reinforced concrete (HyFRC). Systematic experimentations were performed on mechanical properties which include compressive strength (f'c), toughness index (ɳ) and capability coefficient index (ξ), initial fracture toughness (KiniIC), unstable fracture toughness (KunsIC), and fracture energy (GF). The crack resistance process and fiber‐matrix interaction obtained by scanning electron microscopy analysis were also discussed. The proposed analytical models of HyFRC stress–strain equations indicated great suitability for fitting of experimental behavior with R2 ≥ 0.92. The basalt fiber with different length and contents showed a great potential in HyFRC and indicated a substantial degree of enhancement for the compressive and fracture properties, as compared to that of PC and HyFRC without basalt fiber.

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“…Previous studies showed that the addition of fibers is an effective way to improve the strength of composites [ 20 , 21 , 22 ]. The application of hybrid fibers in cement matrix composites in the construction industry has gained considerable developments during past the few decades [ 23 , 24 , 25 , 26 , 27 ]. Steel fibers showed higher thermal conductivity and thermal stability with crack resistance phenomena against thermal stress, even under high temperatures because of effective heat transfer phenomena.…”

Section: Introductionmentioning

confidence: 99%

Uniaxial Tensile Behavior, Flexural Properties, Empirical Calculation and Microstructure of Multi-Scale Fiber Reinforced Cement-Based Material at Elevated Temperature

Khan

Bai

et al. 2021

Materials

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Fire is one of the most unfavorable conditions that cement-based composites can face during their service lives. The uniaxial tensile and flexural tensile properties of the steel-polyvinyl alcohol fiber-calcium carbonate whisker (CW) multi-scale fiber reinforced cement matrix composites (MSFRCs) under high temperatures are studied, including strength, deformation capacity, energy dissipation capacity, and its ability to be assessed through the empirical calculation method. The study showed that with the increase of the treatment temperature, the MSFRC residual bending strength, bending toughness, and tensile strength decreased overall, but the decline was slow at 600 °C. The peak flexural deflection and peak tensile strain of MSFRC first reduced and then increased with the increase of the temperature. As the temperature increased, the nominal stiffness of MSFRC bending and straight gradually reduced, and the rate of decline was faster than that of its strength. However, the uniaxial tensile properties were more sensitive to the temperature and degraded more rapidly. A quantitative relationship was established between MSFRC residual bending, tensile strength, and temperature. A comparison with existing research results shows that MSFRC has achieved an ideal effect of high temperature resistance. The multi-scale hybrid fiber system significantly alleviates the deterioration of cement-based composite’s mechanical properties under high temperatures. With the help of an optical microscope and scanning electron microscope (SEM), the high temperature influence mechanism on the uniaxial tensile and flexural properties of MSFRC was revealed.

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Effectiveness of multiscale hybrid fiber reinforced cementitious composites under single degree of freedom hydraulic shaking table

Cited by 53 publications

References 47 publications

Compressive Strength Evaluation of Ultra-High-Strength Concrete by Machine Learning

Compressive Strength Evaluation of Ultra-High-Strength Concrete by Machine Learning

Hybrid fiber concrete with different basalt fiber length and content

Uniaxial Tensile Behavior, Flexural Properties, Empirical Calculation and Microstructure of Multi-Scale Fiber Reinforced Cement-Based Material at Elevated Temperature

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