Temperature-Related Mechanical Effects in Concrete Elements and Optimization of the Manufacturing Process

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Title: Temperature-Related Mechanical Effects in Concrete Elements and Optimization of the Manufacturing Process

Author(s): E Acker; C. Foucrier; and Y. Malier

Publication: Special Publication

Volume: 95

Issue:

Appears on pages(s): 33-48

Keywords: computer programs; concretes; heat of hydration; optimization; precast concrete; prestressed concrete; reinforced concrete; setting (hardening); temperature; tests; thermal stresses.

Date: 10/1/1986

Abstract:
The DITEX computer program was developed to predict the temperature distribution in a concrete structural element during manufacture and to evaluate the resulting stresses. This program takes account of several types of boundary conditions : variable ambient temperatures, and various kinds of formwork and heat treatment. A simple and inexpensive specific test has been developed to determine the heat of hydration of the cement, the kinetics of which are a function of position. The test consists of recording the temperature during setting of a concrete sample subjected to adiabatic conditions. These tools have recently been applied to actual cases (bridges, tunnels, pressure vessels, etc.) and have demonstrated the variety of their applications: - optimization of the temperature cycle, making possible a significant reduction in fuel consumption; - better distribution of heating resistors to avoid cracks completely; - selection of the type of cement based on quantitative analysis - a judicious staging of the casting of large structures.