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The use of light weight deflectometer to assess the quality of compaction of aggregates layers placed on subgrade reinforced by geosynthetics

Grzegorz Bartnik

Abstract

Dissertation takes the issue of using a light weight deflectometer (LWD) to compaction and load-bearing capacity acceptance of aggregate layers with geosynthetic reinforcement over soft subgrade on the basis of established correlation of tests results received from light weight deflectometer test and traditional compaction control methods. The light weight deflectometer is widely used to estimate compaction level and load-bearing capacity of subgrade and unbound aggregate layers without geosynthetic reinforcement as indirect measures of compaction and capacity. With the aim of assessing deflectometer suitability, measurements of the compaction and load-bearing capacity measures of crushed stone aggregate layers were determined using LWD testing in a laboratory test stand. Performed experimental program included testing of different: aggregates compaction index (Is = 0,88 ÷ 0,92; 0,93 ÷ 0.96; 0,97 ÷ 0,99), aggregate layer thickness (h = 15 ÷ 45 cm) and load-bearing capacity of modeled soft subgrade (E2 ≈ 9; 12; 20; 30 MPa). Measurements were carried out on the aggregate surface which was compacted over the geosynthetic – geotextile or geogrid and on modeled soft subgrade. The values of modules of elasticity Evd and E1, E2 were obtained using: light weight deflectometer (LWD), static plate load tests (VSS) and the value of the compaction index Is was determined based on measurements of the surface of compacted aggregate using a geodesic method. Tests results were involved statistical analysis using STATISTICA in version 10. Conducted analysis: normality tests, one-way analysis of variance (one-way ANOVA), correlation and regression analysis together with graphical presentation of tests results. The results of statistical analysis indicate a statistically significant effect for variable components of test systems on measured values of elasticity modules. Obtained regression models of dependent variables E1, E2, and Is are characterized by high quality prediction and confirm the possibility of using light weight deflectometer to evaluate degree of compaction and load-bearing capacity of aggregate layers compacted over the geosynthetic.
Record ID
WUT12607cddf84345d1b10c3f33603f60aa
Diploma type
Doctor of Philosophy
Author
Title in Polish
Zastosowanie lekkiej płyty dynamicznej do oceny jakości zagęszczenia warstw kruszywa łamanego na podłożu gruntowym wzmocnionym geosyntetykiem
Title in English
The use of light weight deflectometer to assess the quality of compaction of aggregates layers placed on subgrade reinforced by geosynthetics
Language
(pl) Polish
Certifying Unit
Faculty of Civil Engineering (FCE)
Discipline
construction / (technology domain) / (technological sciences)
Status
Finished
Start date
20-11-2013
Defense Date
13-11-2015
Title date
24-11-2015
Supervisor
Maria Jolanta Sulewska Maria Jolanta Sulewska,, External affiliation of publication: Wydział Budownictwa i Inżynierii Środowiska, Politechnika Białostocka
External reviewers
Katarzyna Zabielska-Adamska Katarzyna Zabielska-Adamska,, External affiliation of publication: Wydział Budownictwa i Inżynierii Środowiska, Politechnika Białostocka
Leszek Rafalski Leszek Rafalski,, External affiliation of publication: Instytut Badawczy Dróg i Mostów
Pages
170
Keywords in English
light weight deflectometer, compaction, load-bearing capacity, aggregate, geosynthetics
Abstract in English
Dissertation takes the issue of using a light weight deflectometer (LWD) to compaction and load-bearing capacity acceptance of aggregate layers with geosynthetic reinforcement over soft subgrade on the basis of established correlation of tests results received from light weight deflectometer test and traditional compaction control methods. The light weight deflectometer is widely used to estimate compaction level and load-bearing capacity of subgrade and unbound aggregate layers without geosynthetic reinforcement as indirect measures of compaction and capacity. With the aim of assessing deflectometer suitability, measurements of the compaction and load-bearing capacity measures of crushed stone aggregate layers were determined using LWD testing in a laboratory test stand. Performed experimental program included testing of different: aggregates compaction index (Is = 0,88 ÷ 0,92; 0,93 ÷ 0.96; 0,97 ÷ 0,99), aggregate layer thickness (h = 15 ÷ 45 cm) and load-bearing capacity of modeled soft subgrade (E2 ≈ 9; 12; 20; 30 MPa). Measurements were carried out on the aggregate surface which was compacted over the geosynthetic – geotextile or geogrid and on modeled soft subgrade. The values of modules of elasticity Evd and E1, E2 were obtained using: light weight deflectometer (LWD), static plate load tests (VSS) and the value of the compaction index Is was determined based on measurements of the surface of compacted aggregate using a geodesic method. Tests results were involved statistical analysis using STATISTICA in version 10. Conducted analysis: normality tests, one-way analysis of variance (one-way ANOVA), correlation and regression analysis together with graphical presentation of tests results. The results of statistical analysis indicate a statistically significant effect for variable components of test systems on measured values of elasticity modules. Obtained regression models of dependent variables E1, E2, and Is are characterized by high quality prediction and confirm the possibility of using light weight deflectometer to evaluate degree of compaction and load-bearing capacity of aggregate layers compacted over the geosynthetic.
Thesis file
  • File: 1
    Bartnik.pdf
    Request has been registered
Reviews
  • File: 1
    Recenzja_Rafalski.pdf
    Request has been registered
  • File: 2
    recenzjaZabielska.pdf
    Request has been registered

Uniform Resource Identifier
https://repo.pw.edu.pl/info/phd/WUT12607cddf84345d1b10c3f33603f60aa/
URN
urn:pw-repo:WUT12607cddf84345d1b10c3f33603f60aa

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