Age-Adjusted Effective Elastic Modulus of High-Performance Concrete at Early Age

Dabarera, Arosha; Li, Liang; Li, Jiahang; Jamwal, Vishvendra Singh; Yang, Qifan; Dao, Vinh

doi:10.1007/978-3-030-72921-9_1

Cited by 2 publications

(1 citation statement)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The modulus of elasticity of concrete also plays an important role on the calculation of the time dependent deformations. Interesting studies about the age-adjusted effective elastic modulus of HPC were performed by Dabarera et al 30 and Han et al 31 The age adjusted effective modulus method was developed to consider the time-dependent material effects of concrete members under the service-stress levels and it is now in most design codes and recommendations. 32 Considering all the information presented above, one of the main goals of this study is to check if the most recent creep models are well calibrated for this type of concrete.…”

Section: Introductionmentioning

confidence: 99%

Long‐term behavior of slender long‐span precast prestressed high‐strength concrete girders

Fernandes,

Cavaco,

do Carmo

et al. 2024

Structural Concrete

View full text Add to dashboard Cite

The long‐term behavior of slender (1/40) long‐span precast high‐strength concrete girders was experimentally investigated regarding their use as a competitive solution in relation to steel alternatives for highway overpasses. The time‐dependent effects of full‐scale girders has rarely been addressed, particularly the influence of creep and shrinkage of concrete with compressive strengths around 120 MPa. Two half‐scale girder specimens were produced using an economically optimized and high‐strength concrete mixture, nonfiber reinforced, designed only with conventional raw materials, currently available at Portuguese precast companies, and subjected to long‐term loading, with a magnitude of approximately 50% of the failure load in bending, during a period of 3.75 years. Using the same mixture, prismatic specimens were also produced and subjected to long‐term loading at 24 h and 7 days of age to assess both creep and shrinkage. Results show that the age of concrete at the loading day is of paramount importance regarding the time‐dependent effects. These are most relevant during the first days of loading and tend to stabilize from the 112th day of loading onward. The time‐dependent girder's mid‐span deflection at the end of the 3.75 years did not exceed more than 50% of the initial deformation. Comparison of results with those obtained with Model Code 2010 and the current version of Eurocode 2 shows that these underestimate strains and deflections due to creep, mostly because the short‐term development of these effects, occurring during the first days of loading, are not adequately represented. On the contrary, a sound agreement between experimental and theoretical values, both in short and long term, was obtained using the Auperin et al. approach.

show abstract

Section: Introductionmentioning

confidence: 99%