| dc.description.abstract | A new mineralogical approach is introduced to predict aggregate and concrete coefficient
of thermal expansion (CoTE). Basically, a modeling approach is suggested based on the
assumption that the CoTE of aggregate and concrete can be predicted from the CoTE of
their constituent components. Volume percentage, CoTE and elastic modulus of each
constituent mineral phase are considered as input for the aggregate CoTE model, whereas
the same properties for coarse aggregate and mortar are considered for the concrete CoTE
model. Methods have been formulated to calculate the mineral volume percentage from
bulk chemical analysis for different type of rocks commonly used as aggregates in Texas.
The dilatometer testing method has been established to measure the CoTE of aggregate,
pure minerals, and concrete. Calculated aggregate CoTE, based on the determined CoTE
of pure minerals and their respective calculated volume percentages, shows a good
resemblance with the measured aggregate CoTE by dilatometer. Similarly, predicted
concrete CoTE, based on the calculated CoTE of aggregate and mortar and their
respective volume percentages compares well with the measured concrete CoTE by
dilatometer. Such a favorable comparison between predicted and measured CoTE
provided a basis to establish the composite model to predict aggregate and concrete
CoTE. Composite modeling will be useful to serve as a check of aggregate source
variability in terms of quality control measures and improved design and quality control
measures of concrete. | en |
