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Concrete curing has long been realized to be important to produce durable concrete .
Curing compound is widely used to cure concrete in the field . The current curing
membrane evaluation method ASTM C 156 , however , is incapable of distinguishing the
curing compound quality and guiding the curing practice in the field . A new laboratory
curing membrane evaluation protocol is developed in this study . It has the ability to rank
the quality of curing compound and guide curing practice in the field according to the
field ambient weather conditions and the type of curing compound . A series of field
tests were conducted to investigate the key factors that affect the curing effectiveness in
the field conditions .
A finite element program , temperature and moisture analysis for curing concrete
(TMAC2 ) , is updated to solve the coupled and nonlinear heat transfer and moisture
transport problems in early -age concrete . Moisture capacity is induced into the TMAC2 ,
which makes it unique to characterize the self -desiccation . A full scale concrete
pavement test study was conducted at the FAA National Airport Pavement Test Facility
(NAPTF ) near Atlantic City , New Jersey . In this study , the material properties , i .e .
thermal conductivity and moisture diffusivity , were backcalculated from field data .
Thereafter , backcalculated material properties were used to forward -calculate the
temperature and moisture histories of all other sections .
High order shear deformable theory is used to model the concrete slab curling
and warping behavior because of highly nonlinear temperature and moisture gradients .
The maximum shear strain is obtained a couple of inches below the concrete slab . This
might account for the occurrence of delamination . |
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