scholarly journals Affect of Reinforcement Constraints on Shrinkage and Creep Prediction Model of High Performance Concrete

2016 ◽  
Author(s):  
Junli Luo ◽  
Guanghui Li
Keyword(s):  
Prediction Model ◽  
High Performance ◽  
High Performance Concrete ◽  
Shrinkage And Creep

scholarly journals Shrinkage and creep of high-performance concrete based on calcium sulfoaluminate cement

2019 ◽  
Vol 98 ◽  
pp. 61-73 ◽  
Author(s):  
Davide Sirtoli ◽  
Mateusz Wyrzykowski ◽  
Paolo Riva ◽  
Sergio Tortelli ◽  
Maurizio Marchi ◽  
...  
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Calcium Sulfoaluminate Cement ◽  
Calcium Sulfoaluminate ◽  
Shrinkage And Creep

Volumetric Changes of the UHPC Matrix and its Determination

2016 ◽  
Vol 827 ◽  
pp. 215-218 ◽  
Author(s):  
David Čítek ◽  
Milan Rydval ◽  
Jiří Kolísko
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
High Performance Concrete ◽  
Experimental Tests ◽  
Structure Design ◽  
Ultra High Performance Concrete ◽  
Fine Grained ◽  
Durability Properties ◽  
Shrinkage And Creep

Research in the Ultra-High Performance Concrete applications field is very important. Current experiences shows that the structure design should be optimize due to relatively new fine-grained cement-based Hi-Tech material with excellent mechanical and durability properties. It is not sure if some of the volumetric changes like creep or shrinkage has or has not an impact on an advantage for the construction and for the structure design. The effect of the shrinkage and creep of common used concretes are well known and well described at publications but the effect of volumetric changes of the UHPC is mostly unknown because of the fact that some of experimental tests are long term and the development of UHPC is still in its basics. A lot of works are focused on a basic mechanical properties and durability tests.

Auscultation d'une culée du pont de Portneuf à l'aide d'une inclusion de béton instrumentée (CIUS)

1996 ◽  
Vol 23 (5) ◽  
pp. 1129-1136
Author(s):  
Axel-Pierre Bois ◽  
Mohamed Lachemi ◽  
Gérard Ballivy
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Coefficient Of Thermal Expansion ◽  
Concrete Bridge ◽  
Thermal Gradients ◽  
Bridge Monitoring ◽  
Shrinkage And Creep ◽  
First Results ◽  
Short And Long Term

The Portneuf Bridge, built in 1992, is the first air-entrained high-performance concrete bridge in North America. To understand its short and long term behaviour, an auscultation program has been set. Hence, a cylindrical concrete inclusion of the Université de Sherbrooke was installed in one of the abutments of the bridge. The aim of this study is to present the first results thus acquired. The analysis of the results allowed to calculate the coefficient of thermal expansion of the concrete and to assess deformation variations due to shrinkage and creep and the effects of rebar–concrete interaction in the upper abutment region. Moreover, the presence of thermal gradients, which creates nonisotropic deformations, has been established. Key words: high-performance concrete, deformations, thermal gradients, instrumentation, bridge, monitoring. [Journal translation]

Modeling of Vapor Pressure Build-Up in Heated High-Performance Concrete

2012 ◽  
Vol 204-208 ◽  
pp. 3691-3694
Author(s):  
Jie Zhao ◽  
Jian Jun Zheng ◽  
Gai Fei Peng
Keyword(s):  
High Temperature ◽  
Vapor Pressure ◽  
Prediction Model ◽  
High Performance ◽  
High Performance Concrete ◽  
Dominant Role ◽  
Concrete Structures ◽  
Mechanism Study ◽  
Material Degradation ◽  
Temperature Conditions

Under high temperature conditions, such as fire, high-performance concrete will undergo material degradation or even spalling. Spalling is the most detrimental to concrete structures. To prevent concrete from spalling, the mechanism should be understood. Since the build-up vapor pressure in concrete is supposed to play a dominant role in spalling, a vapor pressure prediction model is proposed in this paper to quantitatively analyze the vapor pressure, which can be used for the spalling mechanism study.

scholarly journals Study on the Model of Creep and the Calculation of Stress Field for Concrete

2015 ◽  
Vol 9 (1) ◽  
pp. 990-996
Author(s):  
Guo Lei ◽  
Yang Zi Sheng
Keyword(s):  
Stress Field ◽  
Prediction Model ◽  
Test Data ◽  
High Performance ◽  
High Performance Concrete ◽  
Influencing Factor ◽  
Strain Increment ◽  
Creep Coefficient ◽  
Creep Stress ◽  
Concrete Materials

The exact prediction of creep is of great significance for the simulation of the stress field of concrete creep. To overcome the limitation of the current prediction model of creep, pertinent models abroad are referred and adopted so that other factors can be controlled under standard state but only the creep varies to evaluate the feasibility of the prediction model with current characteristic of concrete materials and available test data. In the prediction of creep of high performance concrete, any influencing factor can be quantified, therefore, a large number of test data are not required. It was also observed that the defects that factors pointed out were common in the prediction model of concrete. The calculation was simple and convenient and achieved a higher accuracy. In the calculation of creep stress field, the creep was calculated according to fitting creep degree. Based on this, this paper established the creep coefficient formulas for the calculation of strain increment, and deduced the number of finite element expressions which were used to calculate the creep stress field with creep coefficient.

scholarly journals Behaviour of GGBS and ROBO Sand Replaced High Performance Concrete

2019 ◽  
Vol 8 (12) ◽  
pp. 5773-5776
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Unit Cost ◽  
Mechanical Tests ◽  
Split Tensile Strength ◽  
Granulated Blast Furnace Slag ◽  
Points Of Interest ◽  
Shrinkage And Creep ◽  
Furnace Slag

The utilization of superior strength concrete offers points of interest in durability, simplicity of position, and decreased shrinkage and creep, just as expanded compressive, shear and rigidity. Balancing these favorable circumstances are possibly diminished flexibility and imperviousness to fire, and expanded unit cost. The present paper centers around the researching attributes of M50 evaluation concrete with replacement of cement with Ground Granulated Blast Furnace Slag (GGBS) and sand with the ROBO sand (crusher dust). The solid concrete cubes and cylinders are tried for compressive and split tensile strength. It is discovered that by replacement of cement with GGBS and the sand with ROBO sand helped in improving the quality of the solid considerably contrasted with ostensible blend concrete. The compressive quality is learned at 7days, 28 days. Water decreasing admixtures are utilized to expand functionality qualities. For all degrees of bond substitution cement accomplished predominant execution in the crisp and mechanical tests ought to be contrasted and the reference blend.

Fatigue prediction model of ultra-high-performance concrete beams prestressed with CFRP tendons

2021 ◽  
pp. 136943322110623
Author(s):  
Rui Hu ◽  
Zhi Fang ◽  
Ruinian Jiang ◽  
Yu Xiang ◽  
Chuanle Liu
Keyword(s):  
Prediction Model ◽  
High Performance ◽  
High Performance Concrete ◽  
Fatigue Behavior ◽  
Fiber Reinforced Polymer ◽  
Test Results ◽  
Ultra High Performance Concrete ◽  
Flexural Fatigue ◽  
Reinforced Polymer ◽  
Fatigue Development

In the present paper, a comprehensive study on the flexural fatigue behavior of ultra-high-performance concrete (UHPC) beams prestressed with carbon-fiber-reinforced polymer (CFRP) tendons is reported. A total of two UHPC beams prestressed with CFRP tendons were experimentally investigated. On the basis of the fatigue constitutive model of the materials, a fatigue prediction model (FPM) was developed to simulate the flexural fatigue evolvement of the beams. The strain and stress in UHPC and CFRP tendons were calculated by the sectional stress analysis. The influence of steel fiber was considered in the formulae for the crack resistance and crack width, and the midspan deflection was calculated using the sum of deflection before cracking and increment after cracking. The obtained test results were used to verify the FPM. A parametric study was then conducted to analyze the fatigue development of such component, and a formula to predict the flexural fatigue life of UHPC beams under different fatigue loads was proposed.

Sign in / Sign up

Export Citation Format

Share Document