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Pressuremeter Moduli for Airport Pavement Design.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Pressuremeter Moduli for Airport Pavement Design./
作者:	Cosentino, Paul John.
面頁冊數:	1 online resource (339 pages)
附註:	Source: Dissertations Abstracts International, Volume: 48-07, Section: B.
Contained By:	Dissertations Abstracts International48-07B.
標題:	Civil engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9798206730197

Pressuremeter Moduli for Airport Pavement Design.
Cosentino, Paul John.

Pressuremeter Moduli for Airport Pavement Design. - 1 online resource (339 pages)

Source: Dissertations Abstracts International, Volume: 48-07, Section: B.

Thesis (Ph.D.)--Texas A&M University, 1987.

Includes bibliographical references

A relatively new tool, the pavement pressuremeter, was used at three airports in order to evaluate its usefulness in pavement design. Two of the airports had clay subgrades, one had a sand subgrade. The results of the pavement pressuremeter (PPMT) tests were compared to the results of cyclic triaxial (CT) or resilient modulus tests and of falling weight deflectometer (FWD) tests. In order to make the comparisons, five analytical models were adapted to the PPMT results. Four of the models were used to evaluate variations of the PPMT modulus with stress level, strain level, creep and loading cycles, and the fifth PPMT model was used to evaluate the accumulated strain in the soil. The comparisons were conducted in two ways. The first comparison consisted of comparing the measured FWD deflections to the predicted FWD deflections using the finite element program ILLIPAVE and inputing selected PPMT moduli from the four models. The predicted CT deflections were found by inputing the design resilient modulus Mr from the CT procedure established by the Waterways Experiment Station (WES). The second comparison was a direct comparison of the PPMT, CT and FWD moduli. The PPMT moduli came from the methods which resulted in the best predictions of the FWD deflections. The CT moduli came from the WES design procedure and the FWD moduli came from the backcalculation procedure used by Eres Incorporated, from Champaign, Illinois. The testing phase for this study included: 17 cyclic triaxial (CT) tests on samples recovered from the three airport subgrades, 32 pavement pressuremeter (PPMT) tests in the base courses and subgrades of the three airports and 368 Falling Weight Deflectometer (FWD) tests performed on the pavements of the three airports. The research revealed that, for the PPMT, the use of Kondner's hyperbolic strain level model 1/E = a + bε yielded the best prediction for the FWD deflection for clays and that Janbu's stress level model K2 (θ/Pa)n yielded the best prediction of the FWD deflection for sands. It also showed that the PPMT predictions of the FWD deflections were at least as good as the CT predictions. Therefore the PPMT can replace, advantageously, the CT.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798206730197Subjects--Topical Terms:

561339
Civil engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Pressuremeter Moduli for Airport Pavement Design.
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245 1 0 $a Pressuremeter Moduli for Airport Pavement Design.
264 0 $c 1987
300 $a 1 online resource (339 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 48-07, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
502 $a Thesis (Ph.D.)--Texas A&M University, 1987.
504 $a Includes bibliographical references
520 $a A relatively new tool, the pavement pressuremeter, was used at three airports in order to evaluate its usefulness in pavement design. Two of the airports had clay subgrades, one had a sand subgrade. The results of the pavement pressuremeter (PPMT) tests were compared to the results of cyclic triaxial (CT) or resilient modulus tests and of falling weight deflectometer (FWD) tests. In order to make the comparisons, five analytical models were adapted to the PPMT results. Four of the models were used to evaluate variations of the PPMT modulus with stress level, strain level, creep and loading cycles, and the fifth PPMT model was used to evaluate the accumulated strain in the soil. The comparisons were conducted in two ways. The first comparison consisted of comparing the measured FWD deflections to the predicted FWD deflections using the finite element program ILLIPAVE and inputing selected PPMT moduli from the four models. The predicted CT deflections were found by inputing the design resilient modulus Mr from the CT procedure established by the Waterways Experiment Station (WES). The second comparison was a direct comparison of the PPMT, CT and FWD moduli. The PPMT moduli came from the methods which resulted in the best predictions of the FWD deflections. The CT moduli came from the WES design procedure and the FWD moduli came from the backcalculation procedure used by Eres Incorporated, from Champaign, Illinois. The testing phase for this study included: 17 cyclic triaxial (CT) tests on samples recovered from the three airport subgrades, 32 pavement pressuremeter (PPMT) tests in the base courses and subgrades of the three airports and 368 Falling Weight Deflectometer (FWD) tests performed on the pavements of the three airports. The research revealed that, for the PPMT, the use of Kondner's hyperbolic strain level model 1/E = a + bε yielded the best prediction for the FWD deflection for clays and that Janbu's stress level model K2 (θ/Pa)n yielded the best prediction of the FWD deflection for sands. It also showed that the PPMT predictions of the FWD deflections were at least as good as the CT predictions. Therefore the PPMT can replace, advantageously, the CT.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Civil engineering. $3 561339
655 7 $a Electronic books. $2 local $3 554714
690 $a 0543
710 2 $a Texas A&M University. $3 845439
710 2 $a ProQuest Information and Learning Co. $3 1178819
773 0 $t Dissertations Abstracts International $g 48-07B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8802070 $z click for full text (PQDT)