| dc.contributor.advisor |
Folliard , Kevin J . |
|
| dc.contributor.advisor |
Thomas , Michael D . A . |
|
| dc.creator |
Ideker , Jason H . |
|
| dc.date.accessioned |
2012 -10 -02T18 :44 :57Z |
|
| dc.date.accessioned |
2012 -11 -29T20 :54 :17Z |
|
| dc.date.available |
2012 -10 -02T18 :44 :57Z |
|
| dc.date.available |
2012 -11 -29T20 :54 :17Z |
|
| dc.date.created |
2008 |
|
| dc.date.issued |
2012 -10 -02 |
|
| dc.identifier.uri |
http : / /hdl .handle .net /2152 /18120 |
|
| dc.description.abstract |
Compared to the knowledge base for ordinary portland cement concrete (OPCC ) , relatively little information exists for calcium aluminate cement concrete (CACC ) , despite its existence for over 100 years . There is particularly a lack of knowledge related to early -age behavior of CACC , specifically volume change and cracking potential . To assess these early -age properties , two unique pieces of equipment were developed and employed : a rigid cracking frame and free deformation frame which enabled quantification of restrained stress generation and unrestrained autogenous deformation , respectively . These two pieces of equipment employed active temperature control and allowed a wide range of isothermal and realistic temperature conditions to be imposed upon hydrating cementitious samples . Match -cured samples (i .e . identical temperature curing to that in the frames ) enabled the quantification of mechanical property development . Samples cured at discrete isothermal temperatures up to 30 °C developed tensile forces in the rigid cracking frame and exhibited shrinkage phenomena in the free deformation frame . At temperatures above 30 °C , the converse was true and significant compressive forces developed in restrained testing and expansion was observed in unrestrained testing . It was found that this was a direct result of microstructural development related to the formation of metastable phases (associated with shrinkage ) and stable phases (expansion as a result of conversion from metastable to stable phases ) . Proper use of this material must take into account behavior associated with both types of hydrate assemblages , metastable and stable . Realistic time -temperature histories were also investigated based on field -scale concrete cast as part of this research project . It was found that volume change at earlyage was dominantly controlled by thermal history . Furthermore , it was not simply the maximum temperature reached , but the rate of temperature rise during hydration and the resulting duration of time spent at high temperature that profoundly influenced volume change and property development . The research described in this dissertation represents a significant advancement of the state -of -knowledge of this unique material and has further elucidated the role of temperature during hydration of CACC . |
en_US |
| dc.format.medium |
electronic |
|
| dc.language.iso |
eng |
en_US |
| dc.rights |
Copyright © is held by the author . Presentation of this material on the Libraries' web site by University Libraries , The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works . |
|
| dc.subject.lcsh |
Cement - -Expansion and contraction - -Testing |
|
| dc.subject.lcsh |
Concrete - -Cracking - -Testing |
|
| dc.subject.lcsh |
Concrete - -Expansion and contraction - -Testing |
|
| dc.subject.lcsh |
Concrete slabs - -Effect of temperature on - -Testing |
|
| dc.subject.lcsh |
Calcium aluminate - -Industrial applications |
|
| dc.title |
Early -age behavior of calcium aluminate cement systems |
en_US |
| dc.description.department |
Civil , Architectural , and Environmental Engineering |
en_US |
| dc.type.genre |
Thesis |
|
| dc.type.material |
text |
|
| thesis.degree.name |
Doctor of Philosophy |
en_US |
| thesis.degree.level |
Doctoral |
en_US |
| thesis.degree.discipline |
Civil Engineering |
en_US |
| thesis.degree.grantor |
The University of Texas at Austin |
|
| thesis.degree.department |
Civil , Architectural , and Environemental Engineering |
en_US |