Prediction of Adiabatic Temperature Rise in Conventional and High-Performance Concretes Using a 3-D Microstructural Model.
Prediction of Adiabatic Temperature Rise in Conventional
and High-Performance Concretes Using a 3-D
Microstructural Model.
(800 K)
Bentz, D. P.; Waller, V.; deLarrard, F.
Cement and Concrete Research, Vol. 28, No. 2, 285-297,
1998.
Keywords:
concretes; building technology; high performance
concrete; heat of hydration; microstructure modeling;
performance prediction
Abstract:
A series of conventional and high-performance concretes,
with and without silica fume additions, have been
prepared and characterized with respect to their
adiabatic heat signature. The measured responses are
compared with predicted values from the NIST 3-D cement
hydration and microstructural model, which has been
modified to incorporate the pozzolanic reaction of
silica fume and to simulate hydration under adiabatic
conditions. The latter modification is based on the
activation energies and heats of reaction for the
hydration and pozzolanic reactions and the heat capacity
of the hydrating concrete mixture. For concretes with
and without silica fume, the agreement between predicted
and measured response is always within about five
degrees Celsius. For concretes with silica fume, using
an appropriate stoichiometry for the pozzolanic C-S-H is
critical in matching the long-term (4 to 8 day)
experimental temperature rise behavior.
