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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) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 8 (Août 2010) . - pp. 1011-1024 Titre : Stabilized dredged material. I, Parametric Study Type de document : texte imprimé Auteurs : Dennis G. Grubb, Auteur ; Maria Chrysochoou, Auteur ; Charles J. Smith, Auteur Année de publication : 2010 Article en page(s) : pp. 1011-1024 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Soil  stabilization  Soil  cement  Dredge  spoil  By-Product  utilization  Laboratory  tests  Physical  properties Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This study presents the results of a treatability study for dredged material (DM) stabilization using 20 combinations of pozzolanic agents (lime, cement kiln dust, high alkali and slag cements, and fly ash). The DM consisted of CH/OH soil excavated from the U.S. Army Corps of Engineers Craney Island confined disposal facility in Hampton Roads, Virginia, having an in situ moisture content of approximately 130% and void ratio of 3.35. Mix designs were prepared for each stabilized DM (SDM) blend using a 3-day mellowing period for the SDM blends to become compactable. Typical maximum dry unit weights were on the order of 11.9–12.9 kN/m3 (76–82 lb/ft3), for total dry pozzolan doses to wet DM between 5 and 95%, the upper dosing limit being unconstrained for potential use of the SDM blends as fill. Unconfined compression strength (UCS) testing of the SDM blends using DM with an initial MC of 132.5% was completed in accordance with ASTM D1632 and ASTM D1633 for curing times of 7, 28, and 180 days. The 28-day cured specimens had UCS values up to 800 kPa (115 psi). Leaching analyses of the various SDM blends for Resource Conservation and Recovery Act metals using toxicity characteristic leaching procedure and deionized water solutions for extended durations and contact times illustrated that the SDM blends were nonhazardous and virtually identical to the raw DM. Overall, the use of industrial by-products in SDM blends suggests that it may be possible to undertake large-scale fill construction that is sustainable, cost-effective, and environmentally protective of human health and the environment. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i8/p1011_s1?isAuthorized=no [article] Stabilized dredged material. I, Parametric Study [texte imprimé] / Dennis G. Grubb, Auteur ; Maria Chrysochoou, Auteur ; Charles J. Smith, Auteur . - 2010 . - pp. 1011-1024. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 8 (Août 2010) . - pp. 1011-1024 Mots-clés : Soil  stabilization  Soil  cement  Dredge  spoil  By-Product  utilization  Laboratory  tests  Physical  properties Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This study presents the results of a treatability study for dredged material (DM) stabilization using 20 combinations of pozzolanic agents (lime, cement kiln dust, high alkali and slag cements, and fly ash). The DM consisted of CH/OH soil excavated from the U.S. Army Corps of Engineers Craney Island confined disposal facility in Hampton Roads, Virginia, having an in situ moisture content of approximately 130% and void ratio of 3.35. Mix designs were prepared for each stabilized DM (SDM) blend using a 3-day mellowing period for the SDM blends to become compactable. Typical maximum dry unit weights were on the order of 11.9–12.9 kN/m3 (76–82 lb/ft3), for total dry pozzolan doses to wet DM between 5 and 95%, the upper dosing limit being unconstrained for potential use of the SDM blends as fill. Unconfined compression strength (UCS) testing of the SDM blends using DM with an initial MC of 132.5% was completed in accordance with ASTM D1632 and ASTM D1633 for curing times of 7, 28, and 180 days. The 28-day cured specimens had UCS values up to 800 kPa (115 psi). Leaching analyses of the various SDM blends for Resource Conservation and Recovery Act metals using toxicity characteristic leaching procedure and deionized water solutions for extended durations and contact times illustrated that the SDM blends were nonhazardous and virtually identical to the raw DM. Overall, the use of industrial by-products in SDM blends suggests that it may be possible to undertake large-scale fill construction that is sustainable, cost-effective, and environmentally protective of human health and the environment. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i8/p1011_s1?isAuthorized=no

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

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 8 (Août 2010) . - pp. 1025-1036 Titre : Stabilized dredged material. II, Geomechanical behavior Type de document : texte imprimé Auteurs : Dennis G. Grubb, Auteur ; Nicholas E. Malasavage, Auteur ; Charles J. Smith, Auteur Année de publication : 2010 Article en page(s) : pp. 1025-1036 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Soil  stabilization  Soil  cement  Dredge  spoil  Byproduct  utilization  Laboratory  tests  Physical  properties Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This study presents the results of a detailed geotechnical evaluation of six stabilized dredged material (SDM) blends incorporating various combinations of lime, cement kiln dust, high alkali and slag cements, and Class F fly ash. The dredged material classified as CH/OH soil with an in situ moisture content (MC) of approximately 130% and void ratio of 3.35. Mix designs and unconfined compression strength tests were completed for each SDM blend based on 3-day mellowing characteristics. Compacted dry densities were on the order of 7.8–11.2 kN/m3 (49–71 lb/ft3), with MCs on the order of 34–73%. Peak effective friction angles ranged from 20–50° with cohesion intercepts on the order of 30–235 kPa (4–34 lb/in.2) using a maximum stress obiliquity criterion. Postpeak effective friction angles (15% axial strain) were routinely in excess of 40° with low cohesion (<40 kPa; 6 lb/in.2). One sample exhibited very strong soil-fabric effects (cohesion) having an effective friction angle of only approximately 9°, but cohesion on the order of 450 kPa (65 lb/in.2). Negligible consolidation of a 28-day cured sample was measured. Also, contrary to expectations based on the high sulfate contents (10,000–30,000 mg/kg) of the SDM blends, negligible swell (<1%) was measured in five of six SDM blends. The main finding of this research is the SDM blends exhibit the strength, compressibility, and bulking characteristics that make them favorable for large fill applications and subgrade improvement applications at costs equivalent to or less than conventional construction materials. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i8/p1025_s1?isAuthorized=no [article] Stabilized dredged material. II, Geomechanical behavior [texte imprimé] / Dennis G. Grubb, Auteur ; Nicholas E. Malasavage, Auteur ; Charles J. Smith, Auteur . - 2010 . - pp. 1025-1036. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 8 (Août 2010) . - pp. 1025-1036 Mots-clés : Soil  stabilization  Soil  cement  Dredge  spoil  Byproduct  utilization  Laboratory  tests  Physical  properties Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : This study presents the results of a detailed geotechnical evaluation of six stabilized dredged material (SDM) blends incorporating various combinations of lime, cement kiln dust, high alkali and slag cements, and Class F fly ash. The dredged material classified as CH/OH soil with an in situ moisture content (MC) of approximately 130% and void ratio of 3.35. Mix designs and unconfined compression strength tests were completed for each SDM blend based on 3-day mellowing characteristics. Compacted dry densities were on the order of 7.8–11.2 kN/m3 (49–71 lb/ft3), with MCs on the order of 34–73%. Peak effective friction angles ranged from 20–50° with cohesion intercepts on the order of 30–235 kPa (4–34 lb/in.2) using a maximum stress obiliquity criterion. Postpeak effective friction angles (15% axial strain) were routinely in excess of 40° with low cohesion (<40 kPa; 6 lb/in.2). One sample exhibited very strong soil-fabric effects (cohesion) having an effective friction angle of only approximately 9°, but cohesion on the order of 450 kPa (65 lb/in.2). Negligible consolidation of a 28-day cured sample was measured. Also, contrary to expectations based on the high sulfate contents (10,000–30,000 mg/kg) of the SDM blends, negligible swell (<1%) was measured in five of six SDM blends. The main finding of this research is the SDM blends exhibit the strength, compressibility, and bulking characteristics that make them favorable for large fill applications and subgrade improvement applications at costs equivalent to or less than conventional construction materials. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i8/p1025_s1?isAuthorized=no