東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Compaction quality assessment and so...

Li, Shengting.

Linked to FindBook

Google Book

Amazon

博客來

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

Record Type:	Electronic resources : Monograph/item
Title/Author:	Compaction quality assessment and soil-cement stabilization for Iowa embankment construction./
Author:	Li, Shengting.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
Description:	296 p.
Notes:	Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
Contained By:	Dissertation Abstracts International78-04B(E).
Subject:	Civil engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10167685
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. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 296 p.

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

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

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.

ISBN: 9781369220162Subjects--Topical Terms:

860360
Civil engineering.

Compaction quality assessment and soil-cement stabilization for Iowa embankment construction.
LDR:03501nmm a2200325 4500 001 2162657
005 20181009045509.5
008 190424s2016 ||||||||||||||||| ||eng d
020 $a 9781369220162
035 $a (MiAaPQ)AAI10167685
035 $a (MiAaPQ)iastate:15846
035 $a AAI10167685
040 $a MiAaPQ $c MiAaPQ
100 1 $a Li, Shengting. $3 2093003
245 1 0 $a Compaction quality assessment and soil-cement stabilization for Iowa embankment construction.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 296 p.
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.
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.
590 $a School code: 0097.
650 4 $a Civil engineering. $3 860360
650 4 $a Geotechnology. $3 1018558
690 $a 0543
690 $a 0428
710 2 $a Iowa State University. $b Civil, Construction, and Environmental Engineering. $3 1022221
773 0 $t Dissertation Abstracts International $g 78-04B(E).
790 $a 0097
791 $a Ph.D.
792 $a 2016
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10167685