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Compaction quality assessment and soil-cement stabilization for Iowa embankment construction.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Compaction quality assessment and soil-cement stabilization for Iowa embankment construction./
作者:	Li, Shengting.
面頁冊數:	1 online resource (296 pages)
附註:	Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
Contained By:	Dissertation Abstracts International78-04B(E).
標題:	Civil engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9781369220162

Compaction quality assessment and soil-cement stabilization for Iowa embankment construction.
Li, Shengting.

Compaction quality assessment and soil-cement stabilization for Iowa embankment construction. - 1 online resource (296 pages)

Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.

Thesis (Ph.D.)--Iowa State University, 2016.

Includes bibliographical references

This study set out to independently evaluate the quality of compaction using the current specifications. The independent testing results showed that higher rates of data fell outside of the target limits, while in many cases the contractor QC and the agency quality assurance (QA) data fell within the target limits. Statistical analysis results from this study showed some improvements over results from previous projects in terms of the percentage of data that fell within the specification limits. However, QC/QA results are not consistently meeting the target limits/values. Intelligent compaction (IC) technology offers a new and alternative way to control compaction quality. In this study, comparative IC results and in situ point test results involving traditional moisture-density test measurements and performance-based measurements such as light weight deflectometer elastic modulus and dynamic penetration index values were evaluated. Results show that this alternative method can contribute to improved process control, but careful calibration is required.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369220162Subjects--Topical Terms:

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

554714
Electronic books.

Compaction quality assessment and soil-cement stabilization for Iowa embankment construction.
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245 1 0 $a Compaction quality assessment and soil-cement stabilization for Iowa embankment construction.
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300 $a 1 online resource (296 pages)
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500 $a Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
500 $a Adviser: David J. White.
502 $a Thesis (Ph.D.)--Iowa State University, 2016.
504 $a Includes bibliographical references
520 $a This study set out to independently evaluate the quality of compaction using the current specifications. The independent testing results showed that higher rates of data fell outside of the target limits, while in many cases the contractor QC and the agency quality assurance (QA) data fell within the target limits. Statistical analysis results from this study showed some improvements over results from previous projects in terms of the percentage of data that fell within the specification limits. However, QC/QA results are not consistently meeting the target limits/values. Intelligent compaction (IC) technology offers a new and alternative way to control compaction quality. In this study, comparative IC results and in situ point test results involving traditional moisture-density test measurements and performance-based measurements such as light weight deflectometer elastic modulus and dynamic penetration index values were evaluated. Results show that this alternative method can contribute to improved process control, but careful calibration is required.
520 $a Based on the field observation of often wet materials at various sites, a laboratory and numerical study was performed to evaluate an approach to assess compaction quality in terms of controlling post-construction settlement of the fill. Results indicated that this approach can be helpful, but empirical relationships between moisture-density-soil index property and consolidation parameters are required to be able to effectively implement such an approach. Some correlations were developed in this study, but must be further validated.
520 $a Embankment subgrade soils in Iowa are generally rated as fair to poor as construction materials with low bearing strength, high volumetric instability, and durability problems. Cement stabilization offers opportunities to improve these soils conditions. A laboratory investigation was designed and executed in this study with the main objective of developing correlations between soil index properties, unconfined compressive strength (UCS) and cement content. A total of 28 granular and non-granular materials obtained from 9 active construction sites in Iowa were tested using 4 to 12% type I/II portland cement contents. Specimens were prepared using Iowa State University 2 in. by 2 in. compaction apparatus and tested for 28 day UCS with and without vacuum saturation. Results indicated that statistically significant relationships exist between soil index properties, UCS and cement content.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
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710 2 $a Iowa State University. $b Civil, Construction, and Environmental Engineering. $3 1179675
773 0 $t Dissertation Abstracts International $g 78-04B(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10167685 $z click for full text (PQDT)