Early-age concrete temperature and moisture relative to curing effectiveness and projected effects on selected aspects of slab behavior

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Title: Early-age concrete temperature and moisture relative to curing effectiveness and projected effects on selected aspects of slab behavior
Author: Ye, Dan
Abstract: 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 .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1472
Date: 2009-05-15

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Early-age concrete temperature and moisture relative to curing effectiveness and projected effects on selected aspects of slab behavior. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -1472 .

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