The Experts below are selected from a list of 350313 Experts worldwide ranked by ideXlab platform
Caitlin M Tibbetts - One of the best experts on this subject based on the ideXlab platform.
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mercury intrusion porosimetry parameters for use in concrete Penetrability qualification using the katz thompson relationship
Construction and Building Materials, 2020Co-Authors: Caitlin M Tibbetts, Chengcheng Tao, Jerry M Paris, Christopher C FerraroAbstract:Abstract This research studies relationships between pore parameters obtained from mercury intrusion porosimetry (MIP) and experimental results to determine the potential for those parameters to quantify concrete Penetrability using the Katz-Thompson relationship. Water permeability, electrical resistivity, and chloride ion Penetrability were analyzed as these test methods serve as a proxy for Penetrability. Recent developments in mercury intrusion porosimetry accommodate testing larger concrete specimens instead of paste or mortar. Consequently, this work directly compares calculated and measured permeability of nineteen concrete mixtures. By oven-drying the MIP specimens, the calculated permeability was increased due to microcracking; however, when using the same specimen conditioning procedure for MIP and water permeability testing, the resulting calculated and measured water permeability values were comparable.
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Relating water permeability to electrical resistivity and chloride Penetrability of concrete containing different supplementary cementitious materials
Cement & Concrete Composites, 2020Co-Authors: Caitlin M Tibbetts, Jerry M Paris, Christopher C Ferraro, Kyle A. Riding, Timothy G. TownsendAbstract:Abstract Electrical test methods for predicting concrete Penetrability have been widely accepted for use in assessing quality and durability of concrete; however, these methods are indirect and have not been related to concrete water permeability. This research compares three standardized electrical test methods, AASHTO T 358, AASHTO TP 119, and ASTM C1202 , to hydraulic/water permeability. As no consensus standardized water permeability test method is available, a uniaxial, steady-flow permeameter test that has generally been used within the research community was employed for this research. The results demonstrate that the electrical test methods investigated for predicting concrete Penetrability are not necessarily appropriate for concrete mixtures containing alternative supplementary cementitious materials. Materials with electrically conductive components in pore solution or bulk matrix perform poorly in electrical testing such as surface or bulk resistivity, or chloride ion Penetrability testing, although water permeability indicates comparable performance to traditional supplementary cementitious materials.
Christopher C Ferraro - One of the best experts on this subject based on the ideXlab platform.
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mercury intrusion porosimetry parameters for use in concrete Penetrability qualification using the katz thompson relationship
Construction and Building Materials, 2020Co-Authors: Caitlin M Tibbetts, Chengcheng Tao, Jerry M Paris, Christopher C FerraroAbstract:Abstract This research studies relationships between pore parameters obtained from mercury intrusion porosimetry (MIP) and experimental results to determine the potential for those parameters to quantify concrete Penetrability using the Katz-Thompson relationship. Water permeability, electrical resistivity, and chloride ion Penetrability were analyzed as these test methods serve as a proxy for Penetrability. Recent developments in mercury intrusion porosimetry accommodate testing larger concrete specimens instead of paste or mortar. Consequently, this work directly compares calculated and measured permeability of nineteen concrete mixtures. By oven-drying the MIP specimens, the calculated permeability was increased due to microcracking; however, when using the same specimen conditioning procedure for MIP and water permeability testing, the resulting calculated and measured water permeability values were comparable.
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Relating water permeability to electrical resistivity and chloride Penetrability of concrete containing different supplementary cementitious materials
Cement & Concrete Composites, 2020Co-Authors: Caitlin M Tibbetts, Jerry M Paris, Christopher C Ferraro, Kyle A. Riding, Timothy G. TownsendAbstract:Abstract Electrical test methods for predicting concrete Penetrability have been widely accepted for use in assessing quality and durability of concrete; however, these methods are indirect and have not been related to concrete water permeability. This research compares three standardized electrical test methods, AASHTO T 358, AASHTO TP 119, and ASTM C1202 , to hydraulic/water permeability. As no consensus standardized water permeability test method is available, a uniaxial, steady-flow permeameter test that has generally been used within the research community was employed for this research. The results demonstrate that the electrical test methods investigated for predicting concrete Penetrability are not necessarily appropriate for concrete mixtures containing alternative supplementary cementitious materials. Materials with electrically conductive components in pore solution or bulk matrix perform poorly in electrical testing such as surface or bulk resistivity, or chloride ion Penetrability testing, although water permeability indicates comparable performance to traditional supplementary cementitious materials.
Timothy G. Townsend - One of the best experts on this subject based on the ideXlab platform.
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Relating water permeability to electrical resistivity and chloride Penetrability of concrete containing different supplementary cementitious materials
Cement & Concrete Composites, 2020Co-Authors: Caitlin M Tibbetts, Jerry M Paris, Christopher C Ferraro, Kyle A. Riding, Timothy G. TownsendAbstract:Abstract Electrical test methods for predicting concrete Penetrability have been widely accepted for use in assessing quality and durability of concrete; however, these methods are indirect and have not been related to concrete water permeability. This research compares three standardized electrical test methods, AASHTO T 358, AASHTO TP 119, and ASTM C1202 , to hydraulic/water permeability. As no consensus standardized water permeability test method is available, a uniaxial, steady-flow permeameter test that has generally been used within the research community was employed for this research. The results demonstrate that the electrical test methods investigated for predicting concrete Penetrability are not necessarily appropriate for concrete mixtures containing alternative supplementary cementitious materials. Materials with electrically conductive components in pore solution or bulk matrix perform poorly in electrical testing such as surface or bulk resistivity, or chloride ion Penetrability testing, although water permeability indicates comparable performance to traditional supplementary cementitious materials.
Jerry M Paris - One of the best experts on this subject based on the ideXlab platform.
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mercury intrusion porosimetry parameters for use in concrete Penetrability qualification using the katz thompson relationship
Construction and Building Materials, 2020Co-Authors: Caitlin M Tibbetts, Chengcheng Tao, Jerry M Paris, Christopher C FerraroAbstract:Abstract This research studies relationships between pore parameters obtained from mercury intrusion porosimetry (MIP) and experimental results to determine the potential for those parameters to quantify concrete Penetrability using the Katz-Thompson relationship. Water permeability, electrical resistivity, and chloride ion Penetrability were analyzed as these test methods serve as a proxy for Penetrability. Recent developments in mercury intrusion porosimetry accommodate testing larger concrete specimens instead of paste or mortar. Consequently, this work directly compares calculated and measured permeability of nineteen concrete mixtures. By oven-drying the MIP specimens, the calculated permeability was increased due to microcracking; however, when using the same specimen conditioning procedure for MIP and water permeability testing, the resulting calculated and measured water permeability values were comparable.
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Relating water permeability to electrical resistivity and chloride Penetrability of concrete containing different supplementary cementitious materials
Cement & Concrete Composites, 2020Co-Authors: Caitlin M Tibbetts, Jerry M Paris, Christopher C Ferraro, Kyle A. Riding, Timothy G. TownsendAbstract:Abstract Electrical test methods for predicting concrete Penetrability have been widely accepted for use in assessing quality and durability of concrete; however, these methods are indirect and have not been related to concrete water permeability. This research compares three standardized electrical test methods, AASHTO T 358, AASHTO TP 119, and ASTM C1202 , to hydraulic/water permeability. As no consensus standardized water permeability test method is available, a uniaxial, steady-flow permeameter test that has generally been used within the research community was employed for this research. The results demonstrate that the electrical test methods investigated for predicting concrete Penetrability are not necessarily appropriate for concrete mixtures containing alternative supplementary cementitious materials. Materials with electrically conductive components in pore solution or bulk matrix perform poorly in electrical testing such as surface or bulk resistivity, or chloride ion Penetrability testing, although water permeability indicates comparable performance to traditional supplementary cementitious materials.
R. Rajasekaran - One of the best experts on this subject based on the ideXlab platform.
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identification of protegrin 1 as a stable and nontoxic scaffold among protegrin family a computational approach
Journal of Biomolecular Structure & Dynamics, 2019Co-Authors: S R Shruti, R. RajasekaranAbstract:Achieving both, nontoxicity and stability in antimicrobial peptides (AMP) is a challenge. This study predicts a structurally stable, nontoxic scaffold among the protegrin family, for future therapeutic peptide analogs. Protegrins (PG) are a class of pharmaceutically approved, in demand AMPs, which require further improvement in terms of nontoxicity and stability. Out of five protegrins viz., PG1, PG2, PG3, PG4 and PG5, PG1 has been predicted as best scaffold. Prediction was based upon sequential elimination of other protegrins, using computational methods to assess the extracellular bacterial membrane Penetrability, nontoxicity and structural stability by geometric observables. Initially, PG2 and PG4 showing the lowest membrane Penetrability and highest toxicity respectively, were screened out. Among the remaining three protegrins, PG1 displayed both lowest root mean square deviation and radius of gyration, with a considerable occupancy of seven H-bonds and established uniform secondary structure profile throughout its ensembles. Therefore, the authors claim the superiority of PG1 as a nontoxic stable scaffold among its family. Communicated by Ramaswamy H. Sarma.
