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A wave velocity indicator for testing of concreteChubbuck, John G January 1951 (has links)
No description available.
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Crack propagation and fracture mechanics of plain concreteHoopes, Jay Nat, 1938- January 1964 (has links)
No description available.
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An investigation of the effects of a dispersing agent upon the physical properties of a concrete mixRhoades, Daniel Jay 08 1900 (has links)
No description available.
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The Relation between workability and viscosity of freshly mixed concreteYang, Li January 1965 (has links)
This paper describes how the author studied the "workability" of freshly mixed concrete.
Workability is a very important and necessary property which forms part of the specifications for concrete but its meaning is rather vague. Concrete is usually required to have a certain slump or flow, as determined in a standard manner, with standard apparatus, but the readings obtained are comparative only and have no absolute value.
The question which the author asks and tries to answer is, can we treat freshly mixed concrete as a fluid and measure its absolute viscosity and if so how are slump and flow etc. related to it? What does slump and flow really mean in terms of absolute units?
An apparatus was developed which does measure a quantity similar to viscosity and values were obtained for nine different mixes. Readings were however obtained at only one velocity so that the non-Newtonian behaviour of the concrete was not investigated. / Applied Science, Faculty of / Civil Engineering, Department of / Graduate
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Development of a test procedure for water sensitivity of asphalt concrete mixturesAl-Swailmi, Saleh H. 05 May 1992 (has links)
Environmental factors such as temperature, air, and water can have a profound
effect on the durability of asphalt concrete mixtures. In mild climates where good
quality aggregates and asphalt cement are available, the major contribution to
deterioration may be due to traffic loading and the resultant distress is manifested
in the form of fatigue cracking, rutting, and raveling. But, when more severe
climates are coupled with poor materials and traffic, premature failure may result.
The objectives of this research are twofold and includes: (1) development of a test
system to evaluate the most important factors influencing the water sensitivity of
asphalt concrete mixtures; and (2) development of laboratory testing procedures that
will predict field performance. This research also addresses the hypothesis that much
of the water damage in pavements is due to water in the asphalt concrete void
system. It is proposed that most of the water problems occur when voids are in the
range of about 5% to 12%. Thus, the term "pessimum" voids is used to indicate that
range (opposite of optimum).
In order to evaluate the hypothesis and the numerous variables, the Environmental
Conditioning System (ECS) was designed and fabricated. The ECS consists of three
subsystems: (1) fluid conditioning, where the specimen is subjected to predetermined
levels of water, air, or vapor and permeability is measured; (2) an environmental
cabinet that controls the temperature and humidity and encloses the entire load
frame; and (3) the loading system that determines resilient modulus (M[subscript n]) at various
times during environmental cycling and also provides continuous repeated loading
as needed.
The ECS has been used to evaluate four core materials and also to investigate the
relative importance of mixture variables thought to be significant. Many details
regarding specimen preparation and testing procedures were evaluated during a
"shakedown" of the ECS. As minor variables were resolved, a procedure emerged
which appears to be reasonable and suitable. An experiment design for the four core
mixtures was developed, and the overall experiment design included three ranges of
void ( <5% low; 5-12%, pessimum; > 12% high). Six-hour cycles of wet-hot (60° C)
and wet-freeze ( -18° C) are the principle conditioning variables, while monitoring
MR at 25° C before and between cycling. A conventional testing procedure
(AASHTO T-283) was also used on the core mixtures to provide a baseline for
comparison.
Results to date show that the ECS is capable of discerning the relative differences
in "performance" such as MR. Three hot cycles and one freeze cycle appear to be
sufficient to determine the projected relative performance when comparing different
aggregates, asphalts, void levels, loading, etc. Based on these results, a water
conditioning procedure has been recommended and also a procedure for water
conditioning specimens prior to testing in fatigue, rutting, and thermal cracking. / Graduation date: 1992
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The anelastic behaviour of concrete under sustained loadsChang, I-Dee January 2011 (has links)
Digitized by Kansas State University Libraries
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The structural behavior of higher-strength concreteRefai, Tarek Mohamed El Sayed. January 1984 (has links)
Call number: LD2668 .T4 1984 R43 / Master of Science
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Pore-water pressure debonding of asphaltic concreteGaber, Ahmed Yaseen, 1962- January 1989 (has links)
The report presents an evaluation of a modification to an asphalt-debonding test procedure when used with a water debonding apparatus developed at the University of Arizona, the Pore-Water Pressure Debonding Device. The method being modified is that outlined by Jimenez in his report "Testing for Debonding of Asphalt from Aggregates". A regular test specimen, 4 inches in diameter by 2½ inches high, is water-saturated at 122°F and subjected to repeated pore-water pressure varying from 5 to 30 psi. The above factors are kept constant and the following ones are varied: air void content, stress frequency, stress repetition, stress duration and testing temperature. Test results of the modified testing procedure demonstrated the following trend: the higher the value of any of the aforementioned test variables, i.e., the void content, stress frequency, stress repetition, or stress duration, or any combination of these variables, the greater the loss of the mix resistance to stripping.
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Effect of variations in compaction on asphaltic concreteEl-Ali, Mohammad Abdullah, 1958- January 1988 (has links)
In this report the influence of several variables including asphalt content, mixing temperature, compaction temperature and compaction energy on void content, voids-in-the-mineral-aggregate (VMA), density and stability of asphaltic concrete mixtures was established. Straight lines were obtained on double logarithmic paper for each asphalt content when the logarithm of Marshall stability values as ordinate were plotted versus the logarithm of the corresponding number of blows of a Marshall compactor as the abscissa. The straight lines were very nearly parallel and therefore, it was possible to develop a single empirical formula expressing the relationship between stability at any compactive effort, within the range of 20 to 110 blows per face, in terms of the standard stability at 75 blows per face of specimen. Results indicate that void content, VMA, density and stability were significantly affected by compaction temperature, asphalt content, compactive effort and mixing temperature.
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Performance and robustness of self-consolidating concreteNg, Yu-ting, Ivan., 吳汝鋌. January 2008 (has links)
published_or_final_version / Civil Engineering / Doctoral / Doctor of Philosophy
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