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You searched for subject:(LFWD). Showing records 1 – 2 of 2 total matches.

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Louisiana State University

1. Nazzal, Munir Darwish. Field evaluation of in-situ test technology for QC/QA during construction of pavement layers and embankments.

Degree: MSCE, Civil and Environmental Engineering, 2003, Louisiana State University

With the coming changes from an empirical to mechanistic-empirical pavement design, it becomes essential to move towards changing the quality control/quality assurance (QC/QA) procedures of compacted materials from a unit weight-based criterion to a stiffness/strength based criterion. The non-destructive in-situ tests such as Geogauge, Dynamic Cone Penetrometer (DCP), and Light Falling Weight Deflectometer (LFWD) can be used as effective tools in the assessment of subsurface conditions and in evaluating the stiffness of pavement materials and embankment. This thesis evaluates the potential use of these three devices to reliably measure the stiffness characteristics of highway materials for possible application in the QC/QA procedures during and after the construction of pavement layers and embankments. To achieve this, field tests were conducted on highway sections selected from different projects in Louisiana State. In addition, six test sections and three trench sections were constructed and tested at the LTRC Accelerated Load Facility (ALF) site for testing. The field tests included conducting Geogauge, LFWD, DCP tests and standard tests such as the Plate Load Test (PLT) and Falling Weight Deflectometer (FWD) test. The California Bearing Ratio (CBR) laboratory tests were also conducted on samples collected during field tests. Statistical analysis was conducted to correlate the measurements obtained from the three investigated devices and those obtained from the standard tests. Good correlations were obtained between the measurements of the investigated devices and the standard tests. Laboratory tests were also conducted to evaluate the influence depth of the Geogauge and LFWD devices. The results of laboratory tests indicated that the average influence depth for the Geogauge and LFWD devices are about 200 mm and 280 mm, respectively.

Subjects/Keywords: pavemnet construction; geogauge; DCP; LFWD; stiffness modulus; FWD; CBR

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nazzal, M. D. (2003). Field evaluation of in-situ test technology for QC/QA during construction of pavement layers and embankments. (Masters Thesis). Louisiana State University. Retrieved from etd-1009103-094222 ; https://digitalcommons.lsu.edu/gradschool_theses/1002

Chicago Manual of Style (16th Edition):

Nazzal, Munir Darwish. “Field evaluation of in-situ test technology for QC/QA during construction of pavement layers and embankments.” 2003. Masters Thesis, Louisiana State University. Accessed April 11, 2021. etd-1009103-094222 ; https://digitalcommons.lsu.edu/gradschool_theses/1002.

MLA Handbook (7th Edition):

Nazzal, Munir Darwish. “Field evaluation of in-situ test technology for QC/QA during construction of pavement layers and embankments.” 2003. Web. 11 Apr 2021.

Vancouver:

Nazzal MD. Field evaluation of in-situ test technology for QC/QA during construction of pavement layers and embankments. [Internet] [Masters thesis]. Louisiana State University; 2003. [cited 2021 Apr 11]. Available from: etd-1009103-094222 ; https://digitalcommons.lsu.edu/gradschool_theses/1002.

Council of Science Editors:

Nazzal MD. Field evaluation of in-situ test technology for QC/QA during construction of pavement layers and embankments. [Masters Thesis]. Louisiana State University; 2003. Available from: etd-1009103-094222 ; https://digitalcommons.lsu.edu/gradschool_theses/1002


Louisiana State University

2. Seyman, Ekrem. Laboratory evaluation of in-situ tests as potential quality control/quality assurance tools.

Degree: MSCE, Civil and Environmental Engineering, 2003, Louisiana State University

There are new in-situ test devices such as the Geogauge, Light Falling Weight Deflectometer (LFWD) and Dynamic Cone Penetrometer (DCP). Unlike the nuclear density gauge, the new methods provide measurements based on the engineering properties (strength/stiffness) of soil instead of physical properties like field density and moisture content. However the geogauge, LFWD and the DCP are not yet proven to be reliable and the correlations of these tests with standard tests are limited. An extensive laboratory investigation was carried out to evaluate the Geogauge, LFWD and DCP as potential tests to measure in-situ stiffness of highway materials and embankments. In this study, test layers were prepared in two boxes that measure 5 ft length x 3 ft width x 2 ft depth at Louisiana Transportation Research Center (LTRC) Geosynthetic Engineering Research Laboratory (GERL). The results from a series of laboratory tests on embankment soils and base course materials were used to correlate Geogauge, LFWD, Dynamic Cone Penetrometer (DCP) measurements with the Plate Load Test (PLT) and California Bearing Ratio (CBR). There is good correlation between the LFWD dynamic modulus and PLT elastic modulus. The LFWD is a better alternative for static PLT compared to the Geogauge. Although LFWD is a dynamic test, the similarity in depth of influence with the PLT and the quality of developed correlations suggests that the LFWD has better potential to replace the PLT. There is no significant correlation between the LFWD and the CBR test. The Geogauge and the DCP correlates better with the CBR and DCP is already proven to be an effective tool to estimate in-situ CBR. Based on the developed correlations and laboratory experience, it was found that the investigated devices have the potential to measure in-situ stiffness of highway materials and embankments.

Subjects/Keywords: DCP; nuclear density gauge; stiffness; CBR; plate load test; LFWD; geogauge

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Seyman, E. (2003). Laboratory evaluation of in-situ tests as potential quality control/quality assurance tools. (Masters Thesis). Louisiana State University. Retrieved from etd-0903103-182255 ; https://digitalcommons.lsu.edu/gradschool_theses/2601

Chicago Manual of Style (16th Edition):

Seyman, Ekrem. “Laboratory evaluation of in-situ tests as potential quality control/quality assurance tools.” 2003. Masters Thesis, Louisiana State University. Accessed April 11, 2021. etd-0903103-182255 ; https://digitalcommons.lsu.edu/gradschool_theses/2601.

MLA Handbook (7th Edition):

Seyman, Ekrem. “Laboratory evaluation of in-situ tests as potential quality control/quality assurance tools.” 2003. Web. 11 Apr 2021.

Vancouver:

Seyman E. Laboratory evaluation of in-situ tests as potential quality control/quality assurance tools. [Internet] [Masters thesis]. Louisiana State University; 2003. [cited 2021 Apr 11]. Available from: etd-0903103-182255 ; https://digitalcommons.lsu.edu/gradschool_theses/2601.

Council of Science Editors:

Seyman E. Laboratory evaluation of in-situ tests as potential quality control/quality assurance tools. [Masters Thesis]. Louisiana State University; 2003. Available from: etd-0903103-182255 ; https://digitalcommons.lsu.edu/gradschool_theses/2601

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