Creep model of high-performance concrete at different loading ages

Zhang, Yixue; Mao, Jianghong; Zhang, Jun

doi:10.1016/j.conbuildmat.2022.129379

Cited by 8 publications

(6 citation statements)

References 30 publications

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“…The viscoelastic strain ε 11 ve of the concrete in the threedimensional stress state can be derived from Equation (7) and obtained using the analogy method and Equations (22) and (23).…”

Section: Viscoelastic Strain In a Threedimensional Stress Statementioning

confidence: 99%

“…The results show that the proposed creep recovery model is validated by reference data, and its performance is better than existing creep recovery models. Zhang et al 22 carried out a 710-day creep test on high-performance concrete and investigated the effect of the loading period on HPC shrinkage, modulus of elasticity, and creep. A new creep model for concrete is developed based on the hyperbolic function and the effect of the loading period on the creep coefficient.…”

Section: Introductionmentioning

confidence: 99%

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Influence of pore water pressure on concrete creep and a creep model considering the effect of cohesion and internal friction angle

Liu,

Zhang

2024

Fatigue Fract Eng Mat Struct

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A new nonlinear viscoplastic body considering cohesion and internal friction coefficient versus time is proposed by considering cohesion and internal friction angle. A new creep model for concrete considering cohesion and internal friction angle is obtained by interlocking it with the conventional model. The results show that the creep model can properly reflect the creep development of soft‐cut concrete at the pile head by comparing the creep model with the three‐dimensional creep test data trends under various levels of loading. The model can well describe the whole process of creep deformation and also better compensate for the shortcomings of the traditional creep model that cannot describe the characteristics of accelerated creep deformation.

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“…The viscoelastic strain ε 11 ve of the concrete in the threedimensional stress state can be derived from Equation (7) and obtained using the analogy method and Equations (22) and (23).…”

Section: Viscoelastic Strain In a Threedimensional Stress Statementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of pore water pressure on concrete creep and a creep model considering the effect of cohesion and internal friction angle

Liu,

Zhang

2024

Fatigue Fract Eng Mat Struct

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“…The tensile creep of highly porous ceramsite concrete will be lower than that of low-absorbent ceramsite concrete, and plain ceramsite concrete [6,7]. In addition, the loading age of the structure [8][9][10], the curing age [11] and curing temperature [12], the concrete's collapse [13] and sand content [14], dosing of steel fibres [15,16], dosing of polymeric fibers [17], admixture [18], and the relative humidity of the working environment in which the concrete elements are placed [19,20] have all been shown to be influential factors in creep. As research continued, Zhu, Glanville [21,22] and others used experimental and theoretical hypotheses on creep to propose a creep model containing loading age and loading time parameters, respectively.…”

Section: Introductionmentioning

confidence: 97%

Experimental Study on Flexural Bearing Characteristics of Ceramsite Concrete Beams after Creep at Different Curing Ages

Zhu

Chen

et al. 2023

Coatings

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Ceramsite concrete is increasingly used for structural applications due to its lightweight, high-strength, and high-temperature resistance advantages. However, research into the postcreep properties of ceramsite concrete has yet to keep pace with other areas. Therefore, this paper aims to investigate the flexural bearing properties of ceramsite concrete beams after creep and make recommendations for future research. To study the flexural load-bearing performance of ceramsite concrete beams after creep, a comparison test was carried out on four ceramsite concrete beams subjected to 200 d creep loading and four beams subjected to static load without creep loading for four curing ages. The results showed that, at first, the deformation capacity of the ceramsite concrete beams would increase after creep and the toughness and energy absorption capacity would also strengthen. Secondly, the creep could improve the ultimate bearing capacity of the ceramsite concrete beams. It was an approximate 10% increase after 200 d creep. Then, the stiffness, toughness, and ultimate bearing capacity of the ceramsite concrete beams would increase gradually with the increase of the curing age after the creep. In addition, the ultimate bearing capacity of the ceramsite concrete beams increased gradually with the increase of the curing age. The growth rate was faster in the early stage, slower after 120 d, and slower and more stable after 228 d. Finally, creep could cause the maximum crack width and depth of the ceramsite concrete beams decreased and the number of cracks would grow with the curing age. The conclusions obtained in the study provide a theoretical basis for the design of light aggregate structures for creep.

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“…1 Although low water ratios are typically used in HPC in practice to achieve optimal performance, 2 negative effects have been reported, including high self-desiccation, 3 rapid heat growth, 4 and fracturing of the HPC structure when the cumulative tensile stress exceeds the tensile strength. 5 Fractures weaken the structural integrity of hardened concrete and accelerate the entry of external contaminants 6 such as seawater and other corrosive elements. 7 Investigating current HPC structures that exhibit strong resistance to cracking may provide evidence useful in developing and using HPC mixtures that extend the service life of structures.…”

Section: Introductionmentioning

confidence: 99%

The influence of pre-compression on the durability of high-performance concrete incorporating industrial by-products

Ho,

Le,

Huynh

2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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Critical compression impacts may significantly degrade the quality of high-performance concrete (HPC) over time, resulting in significantly reduced service life due to chloride and other corrosive chemical contamination. Moreover, the ability of HPC to resist water and chloride intrusion may degrade rapidly due to pre-compressive-induced damage caused by accelerated porosity development. Although chloride diffusivity in saturated concrete under compressive loading has been adequately discussed in the literature, few studies have addressed the impact of pre-compressive conditions on chloride ingress in HPC incorporating industrial by-product materials. Therefore, this study was designed to evaluate the influence of pre-compression on the porosity and durability of HPC incorporating industrial by-products. Three types of HPC were produced and used in this study, including conventional HPC (the control), HPC in which 35% of the ordinary Portland cement (OPC) was replaced by ground granulated blast-furnace slag (GGBFS; HPC1), and HPC in which 55% of the OPC was replaced by GGBFS (35%) and fly ash (20%; HPC2). These specimen mixtures were designed using an equivalent water-to-binder ratio of 0.30 and cured for up to 28 days. They were subsequently subjected to pre-compression at 0%, 55%, 70%, and 85% of the final compressive strength ( R28) and, afterward, subjected to a series of laboratory experiments to determine porosity, ultrasonic pulse velocity, chloride ion penetration, and water absorption at 28 and 56 days of curing. The proposed research is innovative in its use of material porosity and chloride infiltration factors to determine the impact of pre-loading intensity on HPC structures incorporating industrial by-products. In general, the results revealed that porosity in all of the specimens increased proportionally to the magnitude of the compressive load, while durability decreased proportionally to the pre-compression intensity. Notably, the pre-compression performances of the HPCs incorporating industrial by-products (HPC1 and HPC2) were much better than the control.

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Creep model of high-performance concrete at different loading ages

Cited by 8 publications

References 30 publications

Influence of pore water pressure on concrete creep and a creep model considering the effect of cohesion and internal friction angle

Influence of pore water pressure on concrete creep and a creep model considering the effect of cohesion and internal friction angle

Experimental Study on Flexural Bearing Characteristics of Ceramsite Concrete Beams after Creep at Different Curing Ages

The influence of pre-compression on the durability of high-performance concrete incorporating industrial by-products

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