Short-term tensile creep and shrinkage of ultra-high performance concrete

2009 ◽  
Vol 31 (3) ◽  
pp. 147-152 ◽  
Author(s):  
Victor Y. Garas ◽  
Lawrence F. Kahn ◽  
Kimberly E. Kurtis
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Tensile Creep ◽  
Ultra High Performance Concrete ◽  
Short Term ◽  
Creep And Shrinkage

An Evaluation on the Restrained Shrinkage of Ultra-High Performance Concrete

2012 ◽  
Vol 525-526 ◽  
pp. 449-452 ◽  
Author(s):  
Jung Jun Park ◽  
Doo Yeol Yoo ◽  
Sung Wook Kim ◽  
Young Soo Yoon
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Tensile Creep ◽  
Ring Test ◽  
Early Age ◽  
Restrained Shrinkage ◽  
Reinforcing Bars ◽  
Ultra High Performance Concrete ◽  
Shrinkage Cracking ◽  
Coarse Aggregates

Since ultra-high performance concrete (UHPC) is subject to large occurrence of shrinkage at early age due to its low water-to-cement ratio, the mixing of large quantities of powdered admixtures and the absence of coarse aggregates, UHPC presents large risks of shrinkage cracking caused by the restraints provided by the form and reinforcing bars. Accordingly, this study intends to evaluate the shrinkage behavior of UHPC under restrained state by performing restrained shrinkage test using ring-test. The test results reveal that increasing thickness of the inner ring increases the tensile creep at early age leading to the reduction of the average strain and residual stress of the inner ring.

Summary of the test results of short-term and long-term loading of prestressed I-beams made of ultra-high performance concrete

2015 ◽  
Vol 105 (15) ◽  
pp. 1-7
Author(s):  
Petr Tej ◽  
Jiří Kolísko ◽  
Petr Bouška ◽  
Miroslav Vokáč ◽  
Jindřich Čech
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Test Results ◽  
Ultra High Performance Concrete ◽  
Short Term

Tensile Creep Test of Fiber-Reinforced Ultra-High Performance Concrete

2010 ◽  
Vol 38 (6) ◽  
pp. 102666 ◽  
Author(s):  
M. R. Mitchell ◽  
R. E. Link ◽  
Victor Y. Garas ◽  
Lawrence F. Kahn ◽  
Kimberly E. Kurtis
Keyword(s):  
Creep Test ◽  
High Performance ◽  
High Performance Concrete ◽  
Tensile Creep ◽  
Fiber Reinforced ◽  
Ultra High Performance Concrete

B4 Model Adaptation for Prediction of UHPC Strains from Creep and Shrinkage

2019 ◽  
Vol 292 ◽  
pp. 210-216
Author(s):  
Vladimír Pribramsky
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Fresh Concrete ◽  
Current Model ◽  
Material Model ◽  
Large Set ◽  
Ultra High Performance Concrete ◽  
Great Consistency ◽  
High Level ◽  
Creep And Shrinkage

High compressive strength of ultra-high performance concrete (UHPC) defines high level of compressive strains of UHPC structural elements when efficiently designed. Significant effects are rheological changes in the concrete mixture caused by creep and shrinkage. To design reliable structures with sufficient level of prestressing, it is necessary to determine and predict the magnitude of creep and shrinkage strains of UHPC. Creep and shrinkage model B4 is currently used as most advanced material model based on great consistency with large set of experimental results and measurements on real structures and bridges. It seems to be viable for use for prediction of creep and shrinkage strains of UHPC as it predicts long-term strains by incorporating effect of volume of additives and admixtures used in the fresh concrete. Model B4 also takes into effect thermal treatment of fresh concrete, which accelerates cement hydration in early age. For UHPC mixture is characteristic very low water to cement ratio which is compensated by adding superplasticizers. UHPC mixture also contains large volumes of fine ground additives, most common is silica fume. Current model B4 has several limitations that are often exceeded by characteristics of UHPC. In this paper, these limitations are identified and viable adaptation of model B4 is presented.

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