Documents disponibles écrits par cet auteur

Effects of surfactants on solubilization of perchloroethylene (PCE) and trichloroethylene (TCE) / Sivaram Harendra in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5831-5837 Titre : Effects of surfactants on solubilization of perchloroethylene (PCE) and trichloroethylene (TCE) Type de document : texte imprimé Auteurs : Sivaram Harendra, Auteur ; Cumaraswamy Vipulanandan, Auteur Année de publication : 2011 Article en page(s) : pp. 5831-5837 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Solubilization  Surfactant Résumé : Enhanced solubilization of dense nonaqueous phase liquids (DNAPLs) especially chlorinated hydrocarbons using four types of surfactants was investigated. The solubilization kinetics of perchloroethylene PCE ( 100 mg/L solubility in water) and trichloroethylene TCE (1000 mg/L) in anionic (sodium dodecyl sulfate (SDS)), nonionic (Triton X-100), cationic (cetyltrimethylammoniun bromide (CTAB)), and a biosurfactant (UH biosurfactant) were investigated at room temperature in continuously stirred batch reactors. The size distribution of surfactant micelles were measured using the dynamic light scattering device (DLS). The mean size of SDS, CTAB, Triton X-100, and UH biosurfactant micelles were 4.2 nm, 3.8 nm, 4.5 nm, and 59.1 nm, respectively. Micelle partition coefficients (Km) and molar solubility ratio (MSR) for PCE and TCE in 10 g/L of surfactant solutions have been quantified, and the solubility of PCE and TCE in the surfactant solutions increased by about 10-fold. Solubilization kinetics for PCE and TCE in various surfactant solutions was represented using a hyperbolic relationship. Also the relationship between solubility and interfacial surface tension reduction was investigated. Of the surfactants studied, Triton X-100 had the highest PCE solubilized per gram of surfactant, whereas for TCE, biosurfactant had the highest TCE solubility per gram of surfactant. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128709 [article] Effects of surfactants on solubilization of perchloroethylene (PCE) and trichloroethylene (TCE) [texte imprimé] / Sivaram Harendra, Auteur ; Cumaraswamy Vipulanandan, Auteur . - 2011 . - pp. 5831-5837. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5831-5837 Mots-clés : Solubilization  Surfactant Résumé : Enhanced solubilization of dense nonaqueous phase liquids (DNAPLs) especially chlorinated hydrocarbons using four types of surfactants was investigated. The solubilization kinetics of perchloroethylene PCE ( 100 mg/L solubility in water) and trichloroethylene TCE (1000 mg/L) in anionic (sodium dodecyl sulfate (SDS)), nonionic (Triton X-100), cationic (cetyltrimethylammoniun bromide (CTAB)), and a biosurfactant (UH biosurfactant) were investigated at room temperature in continuously stirred batch reactors. The size distribution of surfactant micelles were measured using the dynamic light scattering device (DLS). The mean size of SDS, CTAB, Triton X-100, and UH biosurfactant micelles were 4.2 nm, 3.8 nm, 4.5 nm, and 59.1 nm, respectively. Micelle partition coefficients (Km) and molar solubility ratio (MSR) for PCE and TCE in 10 g/L of surfactant solutions have been quantified, and the solubility of PCE and TCE in the surfactant solutions increased by about 10-fold. Solubilization kinetics for PCE and TCE in various surfactant solutions was represented using a hyperbolic relationship. Also the relationship between solubility and interfacial surface tension reduction was investigated. Of the surfactants studied, Triton X-100 had the highest PCE solubilized per gram of surfactant, whereas for TCE, biosurfactant had the highest TCE solubility per gram of surfactant. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24128709

Relationship between texas cone penetrometer tests and axial resistances of drilled shafts socketed in clay shale and limestone / Moon S. Nam 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. 1161-1165 Titre : Relationship between texas cone penetrometer tests and axial resistances of drilled shafts socketed in clay shale and limestone Type de document : texte imprimé Auteurs : Moon S. Nam, Auteur ; Cumaraswamy Vipulanandan, Auteur Année de publication : 2010 Article en page(s) : pp. 1161-1165 Note générale : Géotechnique Langues : Anglais (eng) Mots-clés : Rock  socket  Drilled  shafts  Axial  resistances  Texas  cone  penetration  test Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Modern methods for designing drilled shafts in soft rock require knowledge of the compressive strength and modulus of the rock. However, rock jointing at many sites prohibits the recovery of samples of sufficient length and integrity to test rock cores in either unconfined or triaxial compression tests. Since rational design procedures usually require values of compressive strength, surrogate methods must be employed to estimate the compressive strength of the rock. The surrogate methods considered in this study was Texas cone penetrometer tests, and performed at several sites in North Central Texas. In order to develop the relationships between Texas cone penetrations and side and base resistances of rock socketed drilled shafts, three field load tests were conducted. Based on the field study and literature reviews, a relationship between Texas cone penetration tests and axial resistances of rock socketed drilled shafts was proposed. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i8/p1161_s1?isAuthorized=no [article] Relationship between texas cone penetrometer tests and axial resistances of drilled shafts socketed in clay shale and limestone [texte imprimé] / Moon S. Nam, Auteur ; Cumaraswamy Vipulanandan, Auteur . - 2010 . - pp. 1161-1165. Géotechnique Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 136 N° 8 (Août 2010) . - pp. 1161-1165 Mots-clés : Rock  socket  Drilled  shafts  Axial  resistances  Texas  cone  penetration  test Index. décimale : 624.1 Infrastructures.Ouvrages en terre. Fondations. Tunnels Résumé : Modern methods for designing drilled shafts in soft rock require knowledge of the compressive strength and modulus of the rock. However, rock jointing at many sites prohibits the recovery of samples of sufficient length and integrity to test rock cores in either unconfined or triaxial compression tests. Since rational design procedures usually require values of compressive strength, surrogate methods must be employed to estimate the compressive strength of the rock. The surrogate methods considered in this study was Texas cone penetrometer tests, and performed at several sites in North Central Texas. In order to develop the relationships between Texas cone penetrations and side and base resistances of rock socketed drilled shafts, three field load tests were conducted. Based on the field study and literature reviews, a relationship between Texas cone penetration tests and axial resistances of rock socketed drilled shafts was proposed. DEWEY : 624.1 ISSN : 1090-0241 En ligne : http://ascelibrary.org/gto/resource/1/jggefk/v136/i8/p1161_s1?isAuthorized=no

Roughness and unit side resistances of drilled shafts socketed in clay shale and limestone / Moon S. Nam in Journal of geotechnical and geoenvironmental engineering, Vol. 134 n°9 (Septembre 2008) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°9 (Septembre 2008) . - pp. 1272–1279 Titre : Roughness and unit side resistances of drilled shafts socketed in clay shale and limestone Type de document : texte imprimé Auteurs : Moon S. Nam, Auteur ; Cumaraswamy Vipulanandan, Auteur Année de publication : 2008 Article en page(s) : pp. 1272–1279 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Roughness  Drilling  Drilled  shafts  Clays  Rocks  Limestone  Shale Résumé : Rock socketed drilled shafts are being used increasingly to support heavily loaded structures. Rock sockets provide resistance to the load through a combination of side and base resistances. In this study, the effect of drilling tools such as an auger and a core barrel on the unit side resistance was investigated. A total of four field studies were performed on clay shale (compressive strength of 1–2MPa ) and limestone (compressive strength of 10MPa ). Borehole roughnesses produced by the different types of drilling tools in clay shale and limestone were measured using a laser borehole roughness profiler developed in this study to measure roughness to 0.5mm in the boreholes. Based on the results of this study, it was observed that the drilling tools developed different socket roughnesses, which in turn affected the side resistances of the rock socketed drilled shafts. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A9%2812 [...] [article] Roughness and unit side resistances of drilled shafts socketed in clay shale and limestone [texte imprimé] / Moon S. Nam, Auteur ; Cumaraswamy Vipulanandan, Auteur . - 2008 . - pp. 1272–1279. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 134 n°9 (Septembre 2008) . - pp. 1272–1279 Mots-clés : Roughness  Drilling  Drilled  shafts  Clays  Rocks  Limestone  Shale Résumé : Rock socketed drilled shafts are being used increasingly to support heavily loaded structures. Rock sockets provide resistance to the load through a combination of side and base resistances. In this study, the effect of drilling tools such as an auger and a core barrel on the unit side resistance was investigated. A total of four field studies were performed on clay shale (compressive strength of 1–2MPa ) and limestone (compressive strength of 10MPa ). Borehole roughnesses produced by the different types of drilling tools in clay shale and limestone were measured using a laser borehole roughness profiler developed in this study to measure roughness to 0.5mm in the boreholes. Based on the results of this study, it was observed that the drilling tools developed different socket roughnesses, which in turn affected the side resistances of the rock socketed drilled shafts. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282008%29134%3A9%2812 [...]

Simplified relationships for particle-size distribution and permeation groutability limits for soils / Cumaraswamy Vipulanandan in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 9 (Septembre 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 9 (Septembre 2009) . - pp. 1190–1197 Titre : Simplified relationships for particle-size distribution and permeation groutability limits for soils Type de document : texte imprimé Auteurs : Cumaraswamy Vipulanandan, Auteur ; H. Gurkan Ozgurel, Auteur Année de publication : 2009 Article en page(s) : pp. 1190–1197 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Particle  size  distributionChemical  groutingSoil  propertiesParametersFine-grained  soils Résumé : The particle-size distribution of soil with mean particle size and fines content are used not only in soil classifications but also in a number of other soil property relationships. In this study, two simple relationships (hyperbolic [tan h(x)] and S -curve) were investigated to represent the particle size distribution of soils. The parameters of the hyperbolic model were correlated to various soil parameters such as the mean particle size, particle size range, and fines content. There was no direct correlation between Fredlund (four-parameter model) and S -curve model parameters and the soil parameters. The predictions of the two (hyperbolic) and three ( S -curve) parameter models were compared to the four-parameter model (unimodal) using limited soil data from the literature and the agreements were good. The hyperbolic model was used to map the Unified Soil Classification System. A recent study had quantified the relationship between the grouting pressure and the fines content in nonplastic soils. Also in the current practice, upper and lower particle-size distribution limits are used in determining the groutability of soils. In this study, the relationship between grouting pressure and fines contents of the soil was generalized using the hyperbolic particle-size distribution model and verified with a groutability study using an acrylamide grout. Based on limited data in the literature, the groutability of soils was defined using a new set of parameters, grouting pressure, fines content, and mean particle size diameter of the soil. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000064 [article] Simplified relationships for particle-size distribution and permeation groutability limits for soils [texte imprimé] / Cumaraswamy Vipulanandan, Auteur ; H. Gurkan Ozgurel, Auteur . - 2009 . - pp. 1190–1197. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 9 (Septembre 2009) . - pp. 1190–1197 Mots-clés : Particle  size  distributionChemical  groutingSoil  propertiesParametersFine-grained  soils Résumé : The particle-size distribution of soil with mean particle size and fines content are used not only in soil classifications but also in a number of other soil property relationships. In this study, two simple relationships (hyperbolic [tan h(x)] and S -curve) were investigated to represent the particle size distribution of soils. The parameters of the hyperbolic model were correlated to various soil parameters such as the mean particle size, particle size range, and fines content. There was no direct correlation between Fredlund (four-parameter model) and S -curve model parameters and the soil parameters. The predictions of the two (hyperbolic) and three ( S -curve) parameter models were compared to the four-parameter model (unimodal) using limited soil data from the literature and the agreements were good. The hyperbolic model was used to map the Unified Soil Classification System. A recent study had quantified the relationship between the grouting pressure and the fines content in nonplastic soils. Also in the current practice, upper and lower particle-size distribution limits are used in determining the groutability of soils. In this study, the relationship between grouting pressure and fines contents of the soil was generalized using the hyperbolic particle-size distribution model and verified with a groutability study using an acrylamide grout. Based on limited data in the literature, the groutability of soils was defined using a new set of parameters, grouting pressure, fines content, and mean particle size diameter of the soil. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%29GT.1943-5606.0000064