Prediction model for shrinkage-time relation of concrete under variable ambient conditions

Author(s): D.K.H. Amen, R.S. Al-Rawi
Paper category: Workshop
Book title: International RILEM Workshop on Performance Based Evaluation and Indicators for Concrete Durability
Editor(s): V. Baroghel-Bouny, C. Andrade, R. Torrent, K. Scrivener
ISBN: 978-2-912143-95-2
Pages: 185 - 194
Total Pages: 10
Language: English

Abstract: 
In the present research computer program using Matlab is developed to solve non-linear diffusion equation both in one and two dimensions for both the temperature and humidity distribution across the section of the member using Crank Nicklson Method.
Moisture content and moisture loss at any time and point of the section are determined, then moisture loss at each point transformed to the shrinkage of the elements using empirical equation of 400 empirical data points which relate the mean shrinkage of concrete to mean moisture loss for different concrete and cement paste mixes prepared, both shrinkage and moisture loss are measured simultaneously at different drying times.
Tension and compression zones of the section are identified, cracked and un-cracked elements of the section are determined.
Different models are proposed and theoretical model from the output of the program is developed, taking variable ambient condition into consideration as an example for Baghdad climate.
The model based on both totally reversible shrinkage due to the moisture movement.

Online publication: 2007
Publication Type: full_text
Public price (Euros): 0.00