Numerical simulation of early-age shrinkage effects on RC member deflections and cracking development

To understand the characteristics of early-age built-in temperature in JPCP, the actual data of construction climate conditions of typical regions in China were investigated. Based on the application of early-age JPCP temperature numerical simulation program, built-in temperature characteristics of early-age pavement in typical regions was analyzed. The results show that the pavement constructed in different climate conditions produce difference characteristics of early-age built-in temperature due to geographical distinction. Positive built-in temperature difference of JPCP is larger in the regions which have difference in temperature between day and night or higher solar radiation intensity, while the negative built-in temperature difference isn’t influenced obviously by different regions and paving conditions. The maximum positive (negative) built-in temperature difference generally appears in pavement constructed in hot summer. The air temperature is the major factor affecting built-in basic temperature. The higher air temperature, results in the higher built-in basic temperature (temperature in slab bottom) is.

Download Full-text

Early age hydration of cement paste monitored with ultrasonic velocity and numerical simulation

Journal of Wuhan University of Technology-Mater Sci Ed ◽

10.1007/s11595-010-0075-2 ◽

2010 ◽

Vol 25 (4) ◽

pp. 704-707 ◽

Cited By ~ 3

Author(s):

Wei Chen ◽

Zhonghe Shui ◽

Yuan Li

Keyword(s):

Numerical Simulation ◽

Ultrasonic Velocity ◽

Cement Paste ◽

Early Age ◽

Early Age Hydration

Download Full-text

Moisture Transport and Shrinkage in Concrete at early Age

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.174-177.232 ◽

2012 ◽

Vol 174-177 ◽

pp. 232-235 ◽

Cited By ~ 1

Author(s):

Ling Yun Meng

Keyword(s):

Numerical Simulation ◽

Stokes Equation ◽

Lattice Gas ◽

Environmental Scanning Electron Microscopy ◽

Navier Stokes ◽

Early Age ◽

Weak Zone ◽

Navier Stokes Equation ◽

Moisture Flow ◽

Lattice Gas Automata

Abstract: The moisture flow and drying of porous media, such as concrete, is tackled through the Navier-Stokes equation, where the Navier-Stokes equation is considered as the link between the theory of fluid flow, Acoustic Emission (AE) experiments on cracking (sound propagation based on the wave equation) and Lattice Gas Automata, (LGA) being a numerical simulation of the Navier-Stokes equation. Early age cracking in the ITZ is induced by using the moisture flow as the only “load” that causes cracking due to drying shrinkage volume changes in Environmental Scanning Electron Microscopy (ESEM) tests. An attempt is made to link and compare experimental results conducted by means of AE and ESEM to the results of 2-D LGA numerical simulation. Lattice Gas Automata (FHP model) is used as a basis to generate a new model for drying of porous medium. Special emphasis in a model creation is given to the Interface Transition Zone (ITZ), between aggregate and cement paste, because of the early crack initiation in this highly porous and strength-weak zone.

Download Full-text