scholarly journals Experimental and Numerical Study of Early-age Cracking of Concrete Slabs Reinforced with Steel and GFRP Bars

2021 ◽  
Vol 19 (12) ◽  
pp. 1197-1211
Author(s):  
Robert Sonnenschein ◽  
Natalia Gazovicova ◽  
Juraj Bilcik
Keyword(s):  
Numerical Study ◽  
Concrete Slabs ◽  
Early Age ◽  
Gfrp Bars

scholarly journals Characterization of Moisture Diffusion in Cured Concrete Slabs at Early Ages

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Xiao Zhang ◽  
Hongduo Zhao
Keyword(s):  
Process Model ◽  
Model Simulation ◽  
Moisture Diffusion ◽  
Experimental Results ◽  
Concrete Slabs ◽  
Model Parameters ◽  
Early Age ◽  
Water Curing ◽  
Early Age Concrete

The objective of this paper is to investigate the characterization of moisture diffusion inside early-age concrete slabs subjected to curing. Time-dependent relative humidity (RH) distributions of three mixture proportions subjected to three different curing methods (i.e., air curing, water curing, and membrane-forming compounds curing) and sealed condition were measured for 28 days. A one-dimensional nonlinear moisture diffusion partial differential equation (PDE) based on Fick’s second law, which incorporates the effect of curing in the Dirichlet boundary condition using a concept of curing factor, is developed to simulate the diffusion process. Model parameters are calibrated by a genetic algorithm (GA). Experimental results show that the RH reducing rate inside concrete under air curing is greater than the rates under membrane-forming compound curing and water curing. It is shown that the effect of water-to-cement (w/c) ratio on self-desiccation is significant. Lower w/c ratio tends to result in larger RH reduction. RH reduction considering both effect of diffusion and self-desiccation in early-age concrete is not sensitive to w/c ratio, but to curing method. Comparison between model simulation and experimental results indicates that the improved model is able to reflect the effect of curing on moisture diffusion in early-age concrete slabs.

scholarly journals Experimental and Numerical Study on Performance of Concrete Slabs Subjected to Severe Fire

2008 ◽  
Vol 9 ◽  
pp. 1255-1266 ◽  
Author(s):  
F. Ali ◽  
A. Nadjai ◽  
A. Abu-tair
Keyword(s):  
Numerical Study ◽  
Concrete Slabs ◽  
Severe Fire

Testing of Large-Scale Two-Way Concrete Slabs Reinforced with GFRP Bars

2011 ◽  
pp. 287-291 ◽  
Author(s):  
C. Dulude ◽  
E. Ahmed ◽  
S. El-Gamal ◽  
B. Benmokrane
Keyword(s):  
Large Scale ◽  
Concrete Slabs ◽  
Gfrp Bars

scholarly journals Calculation Of Reinforced Concrete Slabs On Yielding Supports Under Short-term Dynamic Loading

2019 ◽  
Vol 221 ◽  
pp. 01009
Author(s):  
Zaur Galyautdinov
Keyword(s):  
Reinforced Concrete ◽  
Structural Reliability ◽  
Numerical Study ◽  
Maximum Effect ◽  
Concrete Slabs ◽  
Deformation Model ◽  
Reinforced Concrete Slabs ◽  
Structural Resistance ◽  
Plastic Phase ◽  
Dynamic Impacts

Buildings and structures used for industrial and civil purposes are exposed to dynamic impacts of emergency nature. To protection of structures one should improve methods for dynamic analysis of structures and also elaborate effective design solutions that ensure structural reliability under intensive dynamic impacts. The given paper considers the multi-layer deformation model for concrete beams; calculation method for 2-way reinforced concrete slabs was elaborated on its basis. In regards to structural solutions, application of yielding supports provides the increasing structural resistance towards dynamic loads of large intensity. The yielding supports are presented as deformable elements of ring cross-section which are characterized by three phases of deformation: elastic, elasto-plastic and hardening phase. The numerical study allowed to evaluate the influence of yielding supports stiffness in plastic phase of deformation on the work of reinforced concrete slabs, as well as the effect of the nature of stiffness distribution along the perimeter of the slab and the deformation level of yielding supports at the moment of transition to the plastic phase deformation. Resulting from the calculations physical and mechanical parameters of supports were defined allowing getting the maximum effect in decrease of the stress-strain state of the structure.

Numerical study on blast responses of rubberized concrete slabs using the Karagozian and Case concrete model

2021 ◽  
Vol 33 ◽  
pp. 101610 ◽  
Author(s):  
Wanhui Feng ◽  
Baiyu Chen ◽  
Fei Yang ◽  
Feng Liu ◽  
Lijuan Li ◽  
...  
Keyword(s):  
Numerical Study ◽  
Concrete Slabs ◽  
Rubberized Concrete ◽  
Concrete Model

scholarly journals Numerical Study on Deflection Behaviour of Concrete Beams Reinforced with GFRP Bars

2017 ◽  
Vol 245 ◽  
pp. 032065 ◽  
Author(s):  
Osama A. Mohamed ◽  
Rania Khattab ◽  
Waddah Al Hawat
Keyword(s):  
Concrete Beams ◽  
Numerical Study ◽  
Gfrp Bars

Estimating early-age in situ strength development of concrete slabs

2012 ◽  
Vol 29 ◽  
pp. 659-666 ◽  
Author(s):  
M. Sofi ◽  
P.A. Mendis ◽  
D. Baweja
Keyword(s):  
Concrete Slabs ◽  
Strength Development ◽  
Early Age
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