Computational Modeling of Drying Shrinkage in Early‐Age Concrete

PAMM ◽  
2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Mehran Ghasabeh ◽  
Serdar Göktepe
Keyword(s):  
Computational Modeling ◽  
Drying Shrinkage ◽  
Early Age ◽  
Early Age Concrete

scholarly journals Measurement of Dry and Autogenous Shrinkages and Thermal Strain of Early Age Concrete Pavement

2021 ◽  
Author(s):  
Jaewook Ku ◽  
Seunghyun Roh ◽  
Hyunsik Hwang
Keyword(s):  
Service Life ◽  
Thermal Strain ◽  
Autogenous Shrinkage ◽  
Drying Shrinkage ◽  
Shrinkage Strain ◽  
Middle Part ◽  
Early Age ◽  
Dependent Strain ◽  
Stress Dependent ◽  
Early Age Concrete

(1)Background: Early-age concrete shrinkage induces stress that impact the cost and service life of concrete pavements. (2)Methods: In this study, strain measurements of field slabs were conducted and a methodology was presented that independently derived autogenous, drying, and thermal shrinkages in the initial stages of concrete placement. Total strain was measured according to five different environmental conditions and shrinkage strain was calculated for each condition. (3)Results: By measuring the strain of the slab and the specimen, the drying shrinkage strain was measured to be approximately 54% better than that by the conventional non-stressed cylinder method because it was possible to measure the drying shrinkage strain at the surface rather than in the middle part of the slab along its depth direction. When the water-to-cement ratio increased (35→40%), there was a considerable reduction (317με→82με) of autogenous shrinkage strain for the concrete at 28 days of age. Furthermore, calculation of stress-dependent strain allowed the presentation of more intuitive and accurate results. (4)Conclusion: As the measurement of independent shrinkage occurrence is possible, the consequent calculated result of the stress-dependent strain acting on real slabs will facilitate improvement in the construction quality, reduction in the development of defects in the concrete structure, and increase in the service life.

Drying shrinkage of early-age concrete for twin-block slab track

2020 ◽  
Vol 243 ◽  
pp. 118237
Author(s):  
Xiao Li ◽  
Juanjuan Ren ◽  
Ji Wang ◽  
Rongshan Yang ◽  
Luhui Shi ◽  
...  
Keyword(s):  
Drying Shrinkage ◽  
Early Age ◽  
Twin Block ◽  
Slab Track ◽  
Early Age Concrete

Very early age concrete hydration characterization monitoring using piezoceramic based smart aggregates

2013 ◽  
Vol 22 (8) ◽  
pp. 085025 ◽  
Author(s):  
Qingzhao Kong ◽  
Shuang Hou ◽  
Qing Ji ◽  
Y L Mo ◽  
Gangbing Song
Keyword(s):  
Early Age ◽  
Concrete Hydration ◽  
Early Age Concrete

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 Monitoring of the ultrasonicP-wave velocity in early-age concrete using Smart Aggregates

2012 ◽  
Vol 1 ◽  
pp. 01001 ◽  
Author(s):  
Cédric Dumoulin ◽  
Grigoris Karaiskos ◽  
Jérôme Carette ◽  
Stéphanie Staquet ◽  
Arnaud Deraemaeker
Keyword(s):  
Wave Velocity ◽  
Early Age ◽  
Early Age Concrete
Sign in / Sign up

Export Citation Format

Share Document