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36 results on '"Juenger, Maria C.G."'

13. Influence of clays and clay-sized particles on concrete performance

Author

Norvell, Justin K., Stewart, Jane G., Juenger, Maria C.G., and Fowler, David W.

Subjects
Concrete -- Properties, Particles -- Influence, Clay -- Influence, Engineering and manufacturing industries, Science and technology
Abstract

In the interest of increasing allowable limits of microfine ( DOI: 10.1061/(ASCE)0899-1561(2007)19:12(1053) CE Database subject headings: Concrete aggregates; Concrete tests; Clays; Particle size.

Published
2007

14. Influence of microfine aggregate characteristics on concrete performance

Author

Stewart, Jane G., Norvell, Justin K., Juenger, Maria C.G., and Fowler, David W.

Subjects
Mineralogy -- Research, Particles -- Mechanical properties, Concrete -- Mechanical properties, Materials -- Testing, Materials -- Methods, Engineering and manufacturing industries, Science and technology
Abstract

ASTM C 33 limits the amount of aggregate smaller than 75 [micro]m (No. 200 sieve) to be used in concrete. There is considerable interest in altering ASTM C 33 to allow a higher percentage of these microfine aggregates, particularly in the case of manufactured aggregates. However, before this can be done, the positive and negative effects of microfine aggregates on concrete performance must be fully investigated. Previous research has indicated that there is not a strong correlation between standard aggregate characterization tests and concrete performance when microfines are present. In this study, several methods of characterizing microfine aggregates were investigated. The intent was to identify the characteristics of microfines that govern their effects on concrete performance. A second goal was to identify easy-to-use test methods that could be used to simply and inexpensively identify good and poor performing microfine aggregates. Three easy-to-use tests were identified that correlated well with concrete performance: the methylene blue test, a particle packing assessment by the weight of microfine aggregates adhering to a single drop of water, and the loose packing tests described in ASTM C 1252. DOI: 10.1061/(ASCE)0899-1561(2007)19:11(957) CE Database subject headings: Concrete aggregates; Concrete tests; Particle size; Mineralogy.

Published
2007

36. Quantification of Effects of Fly Ash Type on Concrete Early-Age Cracking.

Author

Riding, Kyle A., Poole, Jonathan L., Schindler, Anton K., Juenger, Maria C.G., and Folliard, Kevin J.

Subjects
FLY ash, CRACKING of concrete, HYDRATION, CALCIUM, CEMENT, CONSTRUCTION materials, BUILDING material durability, CONCRETE construction, CONCRETE products
Abstract

The article presents a study on the use of fly ash to prevent early cracking of concrete materials. The study examines the factors to be measured to prevent cracking including mechanical property development, heat of hydration, restrained stress, and setting time. A cracking frame was used to determine the effects of fly ash on cracking. Four kinds of fly ashes with different amounts of calcium oxide were used. The study found that the use of fly ashes reduced the heat of hydration in the cement and prevented the onset of early cracking.

Published
2008
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