Early-age autogenous shrinkage, tensile creep, and restrained cracking behavior of ultra-high-performance concrete incorporating polypropylene fibers

Shen, Dejian; Liu, Ci; Luo, Yueyao; Shao, Haoze; Zhou, X. K.; Bai, Songling

doi:10.1016/j.cemconcomp.2023.104948

Cited by 42 publications

(9 citation statements)

References 83 publications

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“…However, several cases of fatigue damage have been reported where environmental factors, in addition to the mechanical load factor, play a crucial role [14]. Therefore, it is important to consider the influence of environmental factors while analyzing and designing RC structures [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

A method to analyze the long-term durability performance of underground reinforced concrete culvert structures under coupled mechanical and environmental loads

Li¹,

Wang²,

Nie³

et al. 2023

Journal of Intelligent Construction

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Keywordsunderground structures reinforced concrete (RC) coupling calculation sensitivity analysis top plate deflection durabilityThe coupling effect of mechanical and environmental loads is the main cause of deterioration in the performance of reinforced concrete (RC) structures. However, most studies on the durability of RC structures have focused only on mechanical or environmental loads. As a result, it is difficult to fully capture the effects of dry shrinkage and creep caused by temperature and humidity changes within the structure, as well as their impact on the overall deformation of the structure. To address this gap, this paper presents a numerical simulation of underground culvert projects using the durability concrete model-complex three-dimensional (DuCOM-COM3D) analysis software. The results of the simulation demonstrate that this approach offers a more precise characterization of the porosity, temperature, and humidity inside the concrete, resulting in improved accuracy in predicting the longterm deflection, crack width, and other macro-mechanical indices of the structure. Despite these advantages, some discrepancies were observed between the calculated and measured long-term deflection values. Additionally, a limit analysis was conducted to investigate the potential causes of the large deformation observed in the measurements. Overall, the results contribute to a better understanding of the complex mechanical and environmental loads affecting RC structures and provide a methodology for accurately simulating their long-term behavior.

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Section: Introductionmentioning

confidence: 99%

A method to analyze the long-term durability performance of underground reinforced concrete culvert structures under coupled mechanical and environmental loads

Li¹,

Wang²,

Nie³

et al. 2023

Journal of Intelligent Construction

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show abstract

“…Compared with ordinary concrete, high-strength concrete has a lower water-binder ratio (typically ≤ 0.4) due to the addition of high-efficiency water-reducing agents [ 3 , 4 , 5 ]. When the water-binder ratio of concrete is less than 0.40 [ 6 ], autogenous shrinkage accounts for a greater proportion of the total shrinkage, which is an important factor causing concrete cracking [ 7 , 8 , 9 , 10 ]. The study of autogenous shrinkage in high-strength concrete needs more attention as it shortens the service life of concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Water-Binder Ratio on the Autogenous Shrinkage of C50 Mass Concrete Mixed with MgO Expansion Agent

et al. 2023

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The high adiabatic temperature rise and low heat dissipation rate of mass concrete will promote rapid hydration of the cementitious material and rapid consumption of water from the concrete pores, which may significantly accelerate the development of concrete autogenous shrinkage. In this study, the effect of the water-binder ratio on the autogenous shrinkage of C50 concrete mixed with MgO expansion agent (MEA) was explained with respect to mechanical properties, pore structure, degree of hydration, and micromorphology of the concrete based on a variable temperature curing chamber. The results show that the high temperature rise within the mass concrete accelerates the development of early (14 d) autogenous shrinkage of the concrete, and that the smaller the water-binder ratio, the greater the autogenous shrinkage of the concrete. With the addition of 8 wt% MEA, the autogenous shrinkage of concrete can be effectively compensated. The larger the water-binder ratio, the higher the degree of MgO hydration, and in terms of the compensation effect of autogenous shrinkage, the best performance is achieved at a water-binder ratio of 0.36. This study provides a data reference for the determination of the water-binder ratio in similar projects with MEA.

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“…Fibers are effective in this regard for two reasons: first, they reduce overall shrinkage deformations and reduce the possibility of tensile stresses exceeding tensile strength, and second, fibers can restrict their development if they occur [ 22 , 34 ]. The addition of any fiber with a diameter less than 40 μm and an aspect ratio greater than 200, in volume fractions of 0.2% to 0.4%, should effectively eliminate plastic shrinkage cracking in concrete [ 22 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ]. Therefore, a wide variety of fibers have now been shown to be beneficial in this regard, including steel, glass, basalt, various synthetic fibers (polypropylene, polyethylene, polyvinyl and carbon) and various natural fibers (sisal, coir, flax and cellulose) [ 15 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 32 , 33 , 40 , 42 , 43 , 44 , 45 , 46 ].…”

Section: Introductionmentioning

confidence: 99%

Portland Cement-Based Grouts Enhanced with Basalt Fibers for Post-Tensioned Concrete Duct Filling

et al. 2023

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In post-tensioned systems, grouts act as a last line of defense to prevent the penetration of harmful compounds such as chlorides, moisture and other substances that cause corrosion in the prestressing steel. For this reason, improving grouts results in the enhancement of the overall durability of the structure. In this study, the physical properties of grouts with basalt microfiber additions in the amounts of 0.03, 0.07 and 0.10% with respect to the mix volume were evaluated. The fresh properties included flowability and unit mass. Specimens were fabricated to evaluate drying shrinkage, compressive strength, air permeability and rapid permeability to chloride ions. The incorporation of basalt microfibers showed a beneficial effect on the physical properties of the grout by increasing the drying shrinkage resistance and decreasing the permeability compared to the reference mix and two commercial dry prepackaged grouts. The optimal grout mix was the one with a percentage of basalt microfibers of 0.10%, which decreased drying shrinkage by 15.98% at 14 days compared to the reference mix, and permeability to chloride ions decreased by 10.82% compared to the control mix.

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Early-age autogenous shrinkage, tensile creep, and restrained cracking behavior of ultra-high-performance concrete incorporating polypropylene fibers

Cited by 42 publications

References 83 publications

A method to analyze the long-term durability performance of underground reinforced concrete culvert structures under coupled mechanical and environmental loads

A method to analyze the long-term durability performance of underground reinforced concrete culvert structures under coupled mechanical and environmental loads

Effect of the Water-Binder Ratio on the Autogenous Shrinkage of C50 Mass Concrete Mixed with MgO Expansion Agent

Portland Cement-Based Grouts Enhanced with Basalt Fibers for Post-Tensioned Concrete Duct Filling

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