Documents disponibles écrits par cet auteur

Aging of crushed glass-dredged material blend embankments / Dennis G. Grubb in Journal of geotechnical and geoenvironmental engineering, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°11 (Novembre 2008) . - pp. 1676–1684 Titre : Aging of crushed glass-dredged material blend embankments Type de document : texte imprimé Auteurs : Dennis G. Grubb, Auteur ; Joseph Wartman, Auteur ; Nicholas E. Malasavage, Auteur Année de publication : 2009 Article en page(s) : pp. 1676–1684 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Laboratory  tests  Recycling  Glass  Dredge  spoil  Physical  properties  Aging  Penetrometers  Embankments Résumé : Four crushed glass (CG) and dredged material (DM) [(CG-DM)] blend embankments constructed (2004) and reconstructed (2005) to local DOT specifications were subjected to cone penetrometer tests (CPT). The CPT resistance of the original set of embankments was evaluated shortly after construction and approximately 360days later, immediately prior to being demolished for purposes of a second study. Cone tip resistances were observed to double to triple with aging. For the 80∕20 CG-DM blend, a 4MPa [40 tons per square foot (tsf)] or threefold increase in CPT tip resistance was measured. Likewise, isotropically consolidated, undrained triaxial shear tests were performed on relatively undisturbed thin-walled tube specimens of the 360-day aged CG-DM blend materials. The triaxial tests revealed that the effective friction angles of the aged materials increased by up to 8° over freshly prepared laboratory CG-DM blend specimens. The strength gains appeared to be more strongly linked to (amorphous) silica cementation rather than the formation of carbonates. Disturbance (demolition and reconstruction) generally reduced the in situ CPT behavior to that of the originally constructed embankments. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A11%281 [...] [article] Aging of crushed glass-dredged material blend embankments [texte imprimé] / Dennis G. Grubb, Auteur ; Joseph Wartman, Auteur ; Nicholas E. Malasavage, Auteur . - 2009 . - pp. 1676–1684. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°11 (Novembre 2008) . - pp. 1676–1684 Mots-clés : Laboratory  tests  Recycling  Glass  Dredge  spoil  Physical  properties  Aging  Penetrometers  Embankments Résumé : Four crushed glass (CG) and dredged material (DM) [(CG-DM)] blend embankments constructed (2004) and reconstructed (2005) to local DOT specifications were subjected to cone penetrometer tests (CPT). The CPT resistance of the original set of embankments was evaluated shortly after construction and approximately 360days later, immediately prior to being demolished for purposes of a second study. Cone tip resistances were observed to double to triple with aging. For the 80∕20 CG-DM blend, a 4MPa [40 tons per square foot (tsf)] or threefold increase in CPT tip resistance was measured. Likewise, isotropically consolidated, undrained triaxial shear tests were performed on relatively undisturbed thin-walled tube specimens of the 360-day aged CG-DM blend materials. The triaxial tests revealed that the effective friction angles of the aged materials increased by up to 8° over freshly prepared laboratory CG-DM blend specimens. The strength gains appeared to be more strongly linked to (amorphous) silica cementation rather than the formation of carbonates. Disturbance (demolition and reconstruction) generally reduced the in situ CPT behavior to that of the originally constructed embankments. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A11%281 [...]

Assessment of sulfate-induced swell in stabilized dredged material / Maria Chrysochoou in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 3 (Mars 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 3 (Mars 2012) . - pp. 407-414 Titre : Assessment of sulfate-induced swell in stabilized dredged material : Is ettringite always a problem? Type de document : texte imprimé Auteurs : Maria Chrysochoou, Auteur ; Dennis G. Grubb, Auteur ; Nicholas E. Malasavage, Auteur Année de publication : 2012 Article en page(s) : pp. 407-414 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Swelling  Sulfate  Dredge  spoil  Cement  Lime  Cement  kiln  dust  Soil  mixing Résumé : This paper is the last in a series related to pozzolanically stabilizing dredged material (DM) using up to 20 different combinations of lime, cement kiln dust (CKD), fly ash (FA), Portland cement (PC), and slag cement. The fine-grained nature of the DM and the presence of high sulfate concentrations (0.6–3.25% by weight) in the stabilized dredged material (SDM) blends derived from the raw materials themselves posed concern for potential ettringite formation and swell. The sulfate contents of the SDM blends were well in excess of the National Lime Association’s thresholds for mitigating against swell (<0.8% by weight SO4). The quantitative mineralogical results showed that the lime and lime/FA SDM blends showed moderate to high ettringite formation (1.6–4.6% by weight) up to 6 months of curing, with all available sulfate bound to ettringite. The lime and lime/FA SDM blends consistently maintained the highest pHs through 6 months, which caused continued release of alumina and increases in strength. The CKD and CKD/FA SDM blends showed the highest ettringite contents through 28 days of curing (up to 5%), but with little additional formation of ettringite through 6 months of curing. The total sulfate content of the SDM blends was not a good predictor of ettringite formation potential, because of decreases in pH below the ettringite stability threshold and, even more importantly, the apparent limited availability of soluble alumina in the SDM blends. Swell tests performed on six SDM blends showed slight consolidation, and no ettringite was detected in the two specimens that swelled. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i3/p407_s1?isAuthorized=no [article] Assessment of sulfate-induced swell in stabilized dredged material : Is ettringite always a problem? [texte imprimé] / Maria Chrysochoou, Auteur ; Dennis G. Grubb, Auteur ; Nicholas E. Malasavage, Auteur . - 2012 . - pp. 407-414. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 3 (Mars 2012) . - pp. 407-414 Mots-clés : Swelling  Sulfate  Dredge  spoil  Cement  Lime  Cement  kiln  dust  Soil  mixing Résumé : This paper is the last in a series related to pozzolanically stabilizing dredged material (DM) using up to 20 different combinations of lime, cement kiln dust (CKD), fly ash (FA), Portland cement (PC), and slag cement. The fine-grained nature of the DM and the presence of high sulfate concentrations (0.6–3.25% by weight) in the stabilized dredged material (SDM) blends derived from the raw materials themselves posed concern for potential ettringite formation and swell. The sulfate contents of the SDM blends were well in excess of the National Lime Association’s thresholds for mitigating against swell (<0.8% by weight SO4). The quantitative mineralogical results showed that the lime and lime/FA SDM blends showed moderate to high ettringite formation (1.6–4.6% by weight) up to 6 months of curing, with all available sulfate bound to ettringite. The lime and lime/FA SDM blends consistently maintained the highest pHs through 6 months, which caused continued release of alumina and increases in strength. The CKD and CKD/FA SDM blends showed the highest ettringite contents through 28 days of curing (up to 5%), but with little additional formation of ettringite through 6 months of curing. The total sulfate content of the SDM blends was not a good predictor of ettringite formation potential, because of decreases in pH below the ettringite stability threshold and, even more importantly, the apparent limited availability of soluble alumina in the SDM blends. Swell tests performed on six SDM blends showed slight consolidation, and no ettringite was detected in the two specimens that swelled. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v138/i3/p407_s1?isAuthorized=no

Crushed glass-dredged material (CG-DM) blends / Dennis G. Grubb in Journal of geotechnical and geoenvironmental engineering, Vol. 134 n°11 (Novembre 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°11 (Novembre 2008) . - pp. 1665–1675 Titre : Crushed glass-dredged material (CG-DM) blends : role of organic matter content and DM variability on field compaction Type de document : texte imprimé Auteurs : Dennis G. Grubb, Auteur ; Allen W. Cadden, Auteur ; David D. Miller, Auteur Année de publication : 2009 Article en page(s) : pp. 1665–1675 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Laboratory  tests  Recycling  Glass  Dredge  spoil  Physical  properties  Soil  mixing  Organic  matter  Field  tests  Soil  compaction Résumé : Trial embankments comprised of crushed glass-dredged material (CG-DM) blends and a 100% DM embankment were constructed to provide the necessary data sets to determine if a moisture content (MC) correction was required for the nuclear density (ND) gauge, as DM may contain a high organic matter content (OC). The MCs of thin-walled tube samples of CG-DM blends collected immediately below the ND gauge were compared to the corresponding ND gauge readings. A direct correlation between the MC data pairings from the tube samples and ND gauge readings showed that the ND gauge was greater than 97% accurate for MCs up to 55% and OCs up to 10% for the CG-DM blends evaluated in this study. However, the MC determined by the ND gauge was underpredicted (not overpredicted) by approximately 2.5%, contrary to theoretical expectations. A comparison of the average MC results per embankment indicated that the ND gauge was generally within 1% of the tube sample values, again on the low side. Interestingly, the rutting of the individual embankment lifts, often used as an informal metric for compaction compliance also was found to be contrary to expectations. The (re)constructed CG-DM embankments of this study were again shown to satisfy local Department of Transportation embankment construction criteria in most cases. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A11%281 [...] [article] Crushed glass-dredged material (CG-DM) blends : role of organic matter content and DM variability on field compaction [texte imprimé] / Dennis G. Grubb, Auteur ; Allen W. Cadden, Auteur ; David D. Miller, Auteur . - 2009 . - pp. 1665–1675. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°11 (Novembre 2008) . - pp. 1665–1675 Mots-clés : Laboratory  tests  Recycling  Glass  Dredge  spoil  Physical  properties  Soil  mixing  Organic  matter  Field  tests  Soil  compaction Résumé : Trial embankments comprised of crushed glass-dredged material (CG-DM) blends and a 100% DM embankment were constructed to provide the necessary data sets to determine if a moisture content (MC) correction was required for the nuclear density (ND) gauge, as DM may contain a high organic matter content (OC). The MCs of thin-walled tube samples of CG-DM blends collected immediately below the ND gauge were compared to the corresponding ND gauge readings. A direct correlation between the MC data pairings from the tube samples and ND gauge readings showed that the ND gauge was greater than 97% accurate for MCs up to 55% and OCs up to 10% for the CG-DM blends evaluated in this study. However, the MC determined by the ND gauge was underpredicted (not overpredicted) by approximately 2.5%, contrary to theoretical expectations. A comparison of the average MC results per embankment indicated that the ND gauge was generally within 1% of the tube sample values, again on the low side. Interestingly, the rutting of the individual embankment lifts, often used as an informal metric for compaction compliance also was found to be contrary to expectations. The (re)constructed CG-DM embankments of this study were again shown to satisfy local Department of Transportation embankment construction criteria in most cases. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A11%281 [...]

Dynamic response of compacted CG, DM, and CG-DM blends / Patricia M. Gallagher in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 8 (Août 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1148–1154 Titre : Dynamic response of compacted CG, DM, and CG-DM blends Type de document : texte imprimé Auteurs : Patricia M. Gallagher, Auteur ; Murat Hamderi, Auteur ; Dennis G. Grubb, Auteur Année de publication : 2009 Article en page(s) : pp. 1148–1154 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Cyclic  tests  Dynamic  response  Recycling  Glass  Dredge  spoil  Physical  properties  Soil  mixing Résumé : The cyclic behavior of 9.5 mm (3/8 in.) minus curbside-collected crushed glass (CG) blended with dredged material (DM), classified as an organic silt by the Unified Soil Classification System, was evaluated using a cyclic triaxial testing program. Tests were performed on 100% CG and 100% DM specimens, and 20/80, 40/60, 60/40, and 80/20 CG-DM blends (dry CG content is reported first). The specimens were compacted to a dry unit weight equivalent to 95% of the maximum dry density based on ASTM D1557. For each material, a minimum of three specimens was tested at cyclic stress ratios of 0.20, 0.35, and 0.45. The DM used in this study exhibited significant plasticity, which would be expected to display cyclic softening behavior according to liquefaction susceptibility criteria proposed by Boulanger and Idriss in 2006. However, the high density of the material resulted in transitional behavior between cyclic mobility and cyclic softening. These findings suggest that as long as the CG, DM, and CG-DM blends are compacted, they should not be susceptible to strength loss or large strain under cyclic loading. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000005 [article] Dynamic response of compacted CG, DM, and CG-DM blends [texte imprimé] / Patricia M. Gallagher, Auteur ; Murat Hamderi, Auteur ; Dennis G. Grubb, Auteur . - 2009 . - pp. 1148–1154. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 8 (Août 2009) . - pp. 1148–1154 Mots-clés : Cyclic  tests  Dynamic  response  Recycling  Glass  Dredge  spoil  Physical  properties  Soil  mixing Résumé : The cyclic behavior of 9.5 mm (3/8 in.) minus curbside-collected crushed glass (CG) blended with dredged material (DM), classified as an organic silt by the Unified Soil Classification System, was evaluated using a cyclic triaxial testing program. Tests were performed on 100% CG and 100% DM specimens, and 20/80, 40/60, 60/40, and 80/20 CG-DM blends (dry CG content is reported first). The specimens were compacted to a dry unit weight equivalent to 95% of the maximum dry density based on ASTM D1557. For each material, a minimum of three specimens was tested at cyclic stress ratios of 0.20, 0.35, and 0.45. The DM used in this study exhibited significant plasticity, which would be expected to display cyclic softening behavior according to liquefaction susceptibility criteria proposed by Boulanger and Idriss in 2006. However, the high density of the material resulted in transitional behavior between cyclic mobility and cyclic softening. These findings suggest that as long as the CG, DM, and CG-DM blends are compacted, they should not be susceptible to strength loss or large strain under cyclic loading. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000005

Geotechnical performance of dredged material—steel slag fines blends / Nicholas E. Malasavage in Journal of geotechnical and geoenvironmental engineering, Vol. 138 N° 8 (Août 2012) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 981–991 Titre : Geotechnical performance of dredged material—steel slag fines blends : Laboratory and field evaluation Type de document : texte imprimé Auteurs : Nicholas E. Malasavage, Auteur ; Santhi Jagupilla, Auteur ; Dennis G. Grubb, Auteur Année de publication : 2012 Article en page(s) : pp. 981–991 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Field  tests  Recycling  Slag  Dredge  spoils  Physical  properties  Soil  mixing  Embankment  Cone  penetration  tests Résumé : This paper contains the results of a combined laboratory and field demonstration project exploring the use of dredged material (DM) blended with steel slag fines [SSF; 9.5 mm (3/8  in.) minus] as synthetic fill materials. The granular nature [a well graded sand (SW) soil], mineralogy, reactivity, and residual lime content of the SSF media make it well suited for blending with DM high-plasticity organic (OH) soil, so that geotechnical and environmental soil improvement occur simultaneously with one amendment. The source materials (100% DM, 100% SSF) were evaluated along with 80/20, 60/40, 50/50, 40/60, and 20/80 DM-SSF blends (dry weight basis), where the DM content is reported first. Key findings include that the 100% DM had a ϕ′CIU¯¯¯ of 27.3°, which increased to a peak ϕ′CIU¯¯¯ value of 45° for the 50/50 DM-SSF blend. The hydraulic conductivity (k) of the 100% DM (10−8  cm/s) remained relatively constant until SSF content reached 80%, where an abrupt increase to 10−5  cm/s was observed. The field demonstration project confirmed that the DM-SSF blends could be easily blended to within ±5% of their target DM content. Trial highway embankments were constructed with 100% DM, 100% SSF, and the 80/20, 50/50, and 20/80 DM-SSF blends to modified Proctor compaction goals ranging from 85 to 95% relative compaction on the maximum dry unit weight, depending on the blend. The average cone penetration test (CPT) tip resistance for 100% DM and 100% SSF media were approximately 1.3 and 57.3 MPa, respectively. The compacted 80/20, 50/50, and 20/80 DM-SSF blend embankments were generally characterized by average CPT tip resistances on the order of 2.9, 6.2, and 11.6 MPa, respectively. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000658 [article] Geotechnical performance of dredged material—steel slag fines blends : Laboratory and field evaluation [texte imprimé] / Nicholas E. Malasavage, Auteur ; Santhi Jagupilla, Auteur ; Dennis G. Grubb, Auteur . - 2012 . - pp. 981–991. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 138 N° 8 (Août 2012) . - pp. 981–991 Mots-clés : Field  tests  Recycling  Slag  Dredge  spoils  Physical  properties  Soil  mixing  Embankment  Cone  penetration  tests Résumé : This paper contains the results of a combined laboratory and field demonstration project exploring the use of dredged material (DM) blended with steel slag fines [SSF; 9.5 mm (3/8  in.) minus] as synthetic fill materials. The granular nature [a well graded sand (SW) soil], mineralogy, reactivity, and residual lime content of the SSF media make it well suited for blending with DM high-plasticity organic (OH) soil, so that geotechnical and environmental soil improvement occur simultaneously with one amendment. The source materials (100% DM, 100% SSF) were evaluated along with 80/20, 60/40, 50/50, 40/60, and 20/80 DM-SSF blends (dry weight basis), where the DM content is reported first. Key findings include that the 100% DM had a ϕ′CIU¯¯¯ of 27.3°, which increased to a peak ϕ′CIU¯¯¯ value of 45° for the 50/50 DM-SSF blend. The hydraulic conductivity (k) of the 100% DM (10−8  cm/s) remained relatively constant until SSF content reached 80%, where an abrupt increase to 10−5  cm/s was observed. The field demonstration project confirmed that the DM-SSF blends could be easily blended to within ±5% of their target DM content. Trial highway embankments were constructed with 100% DM, 100% SSF, and the 80/20, 50/50, and 20/80 DM-SSF blends to modified Proctor compaction goals ranging from 85 to 95% relative compaction on the maximum dry unit weight, depending on the blend. The average cone penetration test (CPT) tip resistance for 100% DM and 100% SSF media were approximately 1.3 and 57.3 MPa, respectively. The compacted 80/20, 50/50, and 20/80 DM-SSF blend embankments were generally characterized by average CPT tip resistances on the order of 2.9, 6.2, and 11.6 MPa, respectively. ISSN : 1090-0241 En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000658

Importance of mineralogy in the geoenvironmental characterization and treatment of chromite ore processing residue / Maria Chrysochoou in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 3 (Mars 2010) 

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Stabilized dredged material. I, Parametric Study / Dennis G. Grubb in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 8 (Août 2010) 

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Stabilized dredged material. II, Geomechanical behavior / Dennis G. Grubb in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 8 (Août 2010) 

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Stabilized dredged material. III, Mineralogical perspective / Maria Chrysochoou in Journal of geotechnical and geoenvironmental engineering, Vol. 136 N° 8 (Août 2010) 

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