Experimental studies and modeling of creep of UHPC

Xu, Yi; Liu, Jiaping; Liu, Jianzhong; Zhang, Ping; Zhang, Qianqian; Jiang, Linhua

doi:10.1016/j.conbuildmat.2018.04.157

Cited by 51 publications

(17 citation statements)

References 15 publications

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“…The creep, drying shrinkage, and autogenous shrinkage should significantly influence the long-term behavior of concrete. The long-term behavior of UHPC has been actively researched, considering various variables, and several of these studies have investigated the creep and shrinkage effects [ 11 , 12 , 13 ]. In addition, studies that investigate compressive strength development characteristics based on the age of concrete can be found in some previous literature [ 14 , 15 , 16 ].…”

Section: Literature Reviewmentioning

confidence: 99%

The Time-Dependent Effect in Ultra High-Performance Concrete According to the Curing Methods

et al. 2022

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Ultra-high-performance concrete (UHPC) is required to develop multifunctional concrete structures such as long-span bridges. During the construction of long-span bridges, girders exhibit significant differences in age because they use different curing days in the precast process. In this study, the performances of UHPC were compared when subjected to long-term storage under various conditions after 3-day steam curing. At 365 days, the compressive strength of steam curing is 197 MPa, moist is 191 MPa, and the air is 169 MPa. Based on these differences, prediction models were proposed for long-term performances. Furthermore, the development characteristics of compressive strength, modulus of elasticity (MOE), and flexural strength until 365 days of age were analyzed under air, moist, and steam conditions. Steam curing exhibited the highest level of strength development while air curing showed the lowest. Flexural strength showed no significant difference depending on age because steel fibers were mixed with UHPC; they significantly contributed to flexural performance. The results would contribute to recognizing differences in strength between members at sites where UHPC is applied and to managing high-quality structures constructed using precast members. These research results are expected to contribute to efficient member production and process management during the construction of large structures such as super-long-span bridges.

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Section: Literature Reviewmentioning

confidence: 99%

The Time-Dependent Effect in Ultra High-Performance Concrete According to the Curing Methods

et al. 2022

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“…Creep behavior holds particular significance for large-span and high-rise structures, wherein the utilization of high-performance concrete (HPC) is prevalent. However, existing creep prediction models for ordinary concrete (OC) exhibit substantial discrepancies when applied to the prediction of HPC creep [ 5 , 6 , 7 ]. Meanwhile, engineering structures often serve in a natural environment characterized by seasonally fluctuating temperature and humidity.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, there are two approaches to HPC creep modeling. One method is modifying the OC creep model by applying an admixture influence function [ 4 , 5 , 6 , 7 , 51 ]. The other is directly constructing an HPC creep model through equal-proportion experiments [ 3 , 4 , 52 ].…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Fluctuating Humidity and Temperature on Creep Deformation in High-Performance Concrete Beams: A Comparative Study between Natural and Laboratorial Environmental Tests

Zhang,

Mao

et al. 2024

Materials

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To investigate the influence of temperature and humidity variations on creep in high-performance concrete beams, beam tests were conducted in both natural and laboratory settings. The findings indicate that the variations in creep primarily stem from temperature changes, whereas humidity changes have little influence on fluctuations in both basic creep and total creep. The influence of humidity on creep is more strongly reflected in the magnitude of creep. Functions describing the influence of temperature and humidity on the creep behavior of high-performance concrete (HPC) subjected to fluctuating conditions are proposed. The findings were employed to examine creep deformation in engineering applications across four places. This study complements the correction method for the creep of members under fluctuating temperature and humidity. This research application can provide a basis for the calculation of the long-term deformation of HPC structures in natural environments.

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“…This model substitutes the compressive testing strength with the derived compressive strength from the UHPC elastic modulus. The design codes do not cover the UHPC creep and shrinkage design models as well (Xu et al, 2018). In addition, Bouziadi et al (2016aBouziadi et al ( , 2016bBouziadi et al ( , 2018aBouziadi et al ( and 2018b and Lahmar et al (2020) numerically investigated shrinkage behaviors of steel fiber reinforced high-strength concrete and concrete made with recycled coarse aggregates subject to thermal loading as well as creep behavior of steel fiber reinforced highstrength concrete beams.…”

Section: Introductionmentioning

confidence: 99%

Normal concrete and ultra-high-performance concrete shrinkage and creep models: Development and Application

Zhu

Zhang

Hussein

et al. 2022

Advances in Structural Engineering

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Because of the excellent tensile and compressive strength and durability of ultra-high-performance concrete (UHPC), a precast UHPC tube filled with normal concrete (NC) (abbreviated as NFUT) has been proposed to accelerate structure construction, reduce maintenance cost, and enhance the bearing capacity. However, the long-term deformation of the NFUT composite column has been rarely studied. To numerically analyze the long-term deformation of the new NFUT composite column due to concrete creep and shrinkage, the individual creep and shrinkage models for the NC column and the precast UHPC tube are needed. The objective of the present research was to conduct the shrinkage and creep tests and determine the creep and shrinkage models for the NFUT structure, fitting the existing models in different codes and standards with collected test data. Results showed that the B3 model effectively simulates the creep and shrinkage of the NC column, and the modified ACI209 model is suited for the creep of the precast UHPC tube. Moreover, a finite element model (FEM) of an actual bridge using the NFUT composite piers is established to verify the proposed models and highlight the structure’s advantages. Through the FEM result comparison between the full NC and NFUT composite piers, the maximal vertical deformation of the pier top is reduced by 56.6%, and the average NC stress at the pier bottom is reduced by 19.9% due to the 10-year shrinkage and creep in the composite piers. The NFUT piers significantly reduce the midspan vertical deformation and side-span rotations around the transverse direction, while its effect on the key cross-sectional normal stresses of the main girder is small.

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Experimental studies and modeling of creep of UHPC

Cited by 51 publications

References 15 publications

The Time-Dependent Effect in Ultra High-Performance Concrete According to the Curing Methods

The Time-Dependent Effect in Ultra High-Performance Concrete According to the Curing Methods

Investigating the Influence of Fluctuating Humidity and Temperature on Creep Deformation in High-Performance Concrete Beams: A Comparative Study between Natural and Laboratorial Environmental Tests

Normal concrete and ultra-high-performance concrete shrinkage and creep models: Development and Application

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