The Experts below are selected from a list of 93 Experts worldwide ranked by ideXlab platform

Lawrence C Chow - One of the best experts on this subject based on the ideXlab platform.

  • effects of hydroxypropyl methylcellulose and other gelling agents on the handling properties of calcium phosphate Cement
    Journal of Biomedical Materials Research, 1997
    Co-Authors: Aishuan Cherng, Shozo Takagi, Lawrence C Chow
    Abstract:

    The calcium phosphate Cement (CPC) used in this study was formed by combining equimolar amounts of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA). This powder, when mixed with water, sets to a hard Cement in about 30 min. However, the water-based CPC paste is not highly cohesive and is vulnerable to washout until hardening occurs. The objectives of this study were to investigate the effects on handling properties, washout resistance, Cement hardening behavior, and mechanical properties of adding several gelling agents to CPC paste. Aqueous solutions that contained a mass fraction of 2-4% of hydroxypropyl methylcellulose (HPMC), carboxyl methylcellulose (CMC), chitosan acetate, and chitosan lactate were used as Cement liquids. Hardening time was measured by the Gilmore needle test; resistance to washout was evaluated by the disintegration of the Cement Specimen in water with agitation; and mechanical strength was evaluated by the measurement of diametral tensile strength and compressive strength. Handling properties were greatly improved by the addition of HPMC, CMC, chitosan acetate, and chitosan lactate. Hardening time was retarded by the additions of HPMC and CMC, and mechanical strength was weakened by the addition of either the chitosan lactate or the chitosan acetate.

  • effects of hydroxypropyl methylcellulose and other gelling agents on the handling properties of calcium phosphate Cement
    Journal of Biomedical Materials Research, 1997
    Co-Authors: Aishuan Cherng, Shozo Takagi, Lawrence C Chow
    Abstract:

    The calcium phosphate Cement (CPC) used in this study was formed by combining equimolar amounts of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA). This powder, when mixed with water, sets to a hard Cement in about 30 min. However, the water-based CPC paste is not highly cohesive and is vulnerable to washout until hardening occurs. The objectives of this study were to investigate the effects on handling properties, washout resistance, Cement hardening behavior, and mechanical properties of adding several gelling agents to CPC paste. Aqueous solutions that contained a mass fraction of 2–4% of hydroxypropyl methylcellulose (HPMC), carboxyl methyl-cellulose (CMC), chitosan acetate, and chitosan lactate were used as Cement liquids. Hardening time was measured by the Gilmore needle test; resistance to washout was evaluated by the disintegration of the Cement Specimen in water with agitation; and mechanical strength was evaluated by the measurement of diametral tensile strength and compressive strength. Handling properties were greatly improved by the addition of HPMC, CMC, chitosan acetate, and chitosan lactate. Hardening time was retarded by the additions of HPMC and CMC, and mechanical strength was weakened by the addition of either the chitosan lactate or the chitosan acetate. © 1997 John Wiley & Sons, Inc. J. Biomed Mater Res, 35, 273–277, 1997.

Jieru Wang - One of the best experts on this subject based on the ideXlab platform.

  • Laboratory Measurement and Analysis of the Deteriorated Layer Permeability Coefficient of Soil-Cement Deteriorated in a Saline Environment
    Materials, 2019
    Co-Authors: Junwei Su, Tu Lu, Jieru Wang
    Abstract:

    The deterioration of soil-Cement in a saline environment leads to a reduction in strength and an increase in permeability. Effective methods of determining the deteriorated layer permeability coefficient of soil-Cement are currently lacking. A laboratory test method for measuring the permeability coefficient of the deteriorated layer was proposed using the modified permeability coefficient testing apparatus. According to the proposed method, the permeability coefficient of the deteriorated layer could be obtained after testing the permeability coefficient of the soil-Cement Specimen in acuring room and testing the equivalent permeability coefficient and deterioration depth of the soil-Cement Specimen in a deteriorated environment. Using the marine dredger fill from Jiaozhou Bay as a case study, the deteriorated layer permeability coefficients of soil-Cements with different Cement contents were tested. It turned out that the permeability of the deteriorated layer increases with age. At the beginning of the curing age, higher Cement content led to a smaller permeability coefficient of the deteriorated layer of soil-Cement. As the curing age increased, the deteriorated layer permeability coefficient of the soil-Cement with higher Cement content increased. The evolution of the permeability coefficient of a deteriorated layer with age can be formulated as the Logistic function. This study provides support for anti-permeability designs of soil-Cement structures in saline environments.

  • Laboratory Measurement and Analysis of Deteriorated Layer Permeability Coefficient of Corroded Soil-Cement
    2019
    Co-Authors: Junwei Su, Tu Lu, Jieru Wang
    Abstract:

    The deterioration of soil-Cement in corrosive environment leads to the reduction of strength and the increase of permeability. Effective methods of determining deteriorated layer permeability coefficient of soil-Cement are currently lacking. A laboratory test method for permeability coefficient of deteriorated layer was proposed using the modified permeability coefficient testing apparatus. According to the proposed method, the permeability coefficient of deteriorated layer can be obtained after testing the permeability coefficient of the soil-Cement Specimen in curing room and the equivalent permeability coefficient and deterioration depth of the soil-Cement Specimen in corrosion environment. Taking the marine dredger fill of Jiaozhou Bay for example, the deteriorated layer permeability coefficients of soil-Cements with different Cement contents were tested. It turned out that the permeability of deteriorated layer increases with the increase of age. At the beginning of curing age, larger Cement content leads to smaller permeability coefficient of the deteriorated layer of soil-Cement. As the curing age increases, the deteriorated layer permeability coefficient of the soil-Cement with larger Cement content becomes larger. The evolution of the permeability coefficient of deteriorated layer with age can be formulated as the Logistic function. This study provides a support for anti-permeability designs of soil-Cement structures in corrosive environment.

Aishuan Cherng - One of the best experts on this subject based on the ideXlab platform.

  • effects of hydroxypropyl methylcellulose and other gelling agents on the handling properties of calcium phosphate Cement
    Journal of Biomedical Materials Research, 1997
    Co-Authors: Aishuan Cherng, Shozo Takagi, Lawrence C Chow
    Abstract:

    The calcium phosphate Cement (CPC) used in this study was formed by combining equimolar amounts of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA). This powder, when mixed with water, sets to a hard Cement in about 30 min. However, the water-based CPC paste is not highly cohesive and is vulnerable to washout until hardening occurs. The objectives of this study were to investigate the effects on handling properties, washout resistance, Cement hardening behavior, and mechanical properties of adding several gelling agents to CPC paste. Aqueous solutions that contained a mass fraction of 2-4% of hydroxypropyl methylcellulose (HPMC), carboxyl methylcellulose (CMC), chitosan acetate, and chitosan lactate were used as Cement liquids. Hardening time was measured by the Gilmore needle test; resistance to washout was evaluated by the disintegration of the Cement Specimen in water with agitation; and mechanical strength was evaluated by the measurement of diametral tensile strength and compressive strength. Handling properties were greatly improved by the addition of HPMC, CMC, chitosan acetate, and chitosan lactate. Hardening time was retarded by the additions of HPMC and CMC, and mechanical strength was weakened by the addition of either the chitosan lactate or the chitosan acetate.

  • effects of hydroxypropyl methylcellulose and other gelling agents on the handling properties of calcium phosphate Cement
    Journal of Biomedical Materials Research, 1997
    Co-Authors: Aishuan Cherng, Shozo Takagi, Lawrence C Chow
    Abstract:

    The calcium phosphate Cement (CPC) used in this study was formed by combining equimolar amounts of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA). This powder, when mixed with water, sets to a hard Cement in about 30 min. However, the water-based CPC paste is not highly cohesive and is vulnerable to washout until hardening occurs. The objectives of this study were to investigate the effects on handling properties, washout resistance, Cement hardening behavior, and mechanical properties of adding several gelling agents to CPC paste. Aqueous solutions that contained a mass fraction of 2–4% of hydroxypropyl methylcellulose (HPMC), carboxyl methyl-cellulose (CMC), chitosan acetate, and chitosan lactate were used as Cement liquids. Hardening time was measured by the Gilmore needle test; resistance to washout was evaluated by the disintegration of the Cement Specimen in water with agitation; and mechanical strength was evaluated by the measurement of diametral tensile strength and compressive strength. Handling properties were greatly improved by the addition of HPMC, CMC, chitosan acetate, and chitosan lactate. Hardening time was retarded by the additions of HPMC and CMC, and mechanical strength was weakened by the addition of either the chitosan lactate or the chitosan acetate. © 1997 John Wiley & Sons, Inc. J. Biomed Mater Res, 35, 273–277, 1997.

Junwei Su - One of the best experts on this subject based on the ideXlab platform.

  • Laboratory Measurement and Analysis of the Deteriorated Layer Permeability Coefficient of Soil-Cement Deteriorated in a Saline Environment
    Materials, 2019
    Co-Authors: Junwei Su, Tu Lu, Jieru Wang
    Abstract:

    The deterioration of soil-Cement in a saline environment leads to a reduction in strength and an increase in permeability. Effective methods of determining the deteriorated layer permeability coefficient of soil-Cement are currently lacking. A laboratory test method for measuring the permeability coefficient of the deteriorated layer was proposed using the modified permeability coefficient testing apparatus. According to the proposed method, the permeability coefficient of the deteriorated layer could be obtained after testing the permeability coefficient of the soil-Cement Specimen in acuring room and testing the equivalent permeability coefficient and deterioration depth of the soil-Cement Specimen in a deteriorated environment. Using the marine dredger fill from Jiaozhou Bay as a case study, the deteriorated layer permeability coefficients of soil-Cements with different Cement contents were tested. It turned out that the permeability of the deteriorated layer increases with age. At the beginning of the curing age, higher Cement content led to a smaller permeability coefficient of the deteriorated layer of soil-Cement. As the curing age increased, the deteriorated layer permeability coefficient of the soil-Cement with higher Cement content increased. The evolution of the permeability coefficient of a deteriorated layer with age can be formulated as the Logistic function. This study provides support for anti-permeability designs of soil-Cement structures in saline environments.

  • Laboratory Measurement and Analysis of Deteriorated Layer Permeability Coefficient of Corroded Soil-Cement
    2019
    Co-Authors: Junwei Su, Tu Lu, Jieru Wang
    Abstract:

    The deterioration of soil-Cement in corrosive environment leads to the reduction of strength and the increase of permeability. Effective methods of determining deteriorated layer permeability coefficient of soil-Cement are currently lacking. A laboratory test method for permeability coefficient of deteriorated layer was proposed using the modified permeability coefficient testing apparatus. According to the proposed method, the permeability coefficient of deteriorated layer can be obtained after testing the permeability coefficient of the soil-Cement Specimen in curing room and the equivalent permeability coefficient and deterioration depth of the soil-Cement Specimen in corrosion environment. Taking the marine dredger fill of Jiaozhou Bay for example, the deteriorated layer permeability coefficients of soil-Cements with different Cement contents were tested. It turned out that the permeability of deteriorated layer increases with the increase of age. At the beginning of curing age, larger Cement content leads to smaller permeability coefficient of the deteriorated layer of soil-Cement. As the curing age increases, the deteriorated layer permeability coefficient of the soil-Cement with larger Cement content becomes larger. The evolution of the permeability coefficient of deteriorated layer with age can be formulated as the Logistic function. This study provides a support for anti-permeability designs of soil-Cement structures in corrosive environment.

Shozo Takagi - One of the best experts on this subject based on the ideXlab platform.

  • effects of hydroxypropyl methylcellulose and other gelling agents on the handling properties of calcium phosphate Cement
    Journal of Biomedical Materials Research, 1997
    Co-Authors: Aishuan Cherng, Shozo Takagi, Lawrence C Chow
    Abstract:

    The calcium phosphate Cement (CPC) used in this study was formed by combining equimolar amounts of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA). This powder, when mixed with water, sets to a hard Cement in about 30 min. However, the water-based CPC paste is not highly cohesive and is vulnerable to washout until hardening occurs. The objectives of this study were to investigate the effects on handling properties, washout resistance, Cement hardening behavior, and mechanical properties of adding several gelling agents to CPC paste. Aqueous solutions that contained a mass fraction of 2-4% of hydroxypropyl methylcellulose (HPMC), carboxyl methylcellulose (CMC), chitosan acetate, and chitosan lactate were used as Cement liquids. Hardening time was measured by the Gilmore needle test; resistance to washout was evaluated by the disintegration of the Cement Specimen in water with agitation; and mechanical strength was evaluated by the measurement of diametral tensile strength and compressive strength. Handling properties were greatly improved by the addition of HPMC, CMC, chitosan acetate, and chitosan lactate. Hardening time was retarded by the additions of HPMC and CMC, and mechanical strength was weakened by the addition of either the chitosan lactate or the chitosan acetate.

  • effects of hydroxypropyl methylcellulose and other gelling agents on the handling properties of calcium phosphate Cement
    Journal of Biomedical Materials Research, 1997
    Co-Authors: Aishuan Cherng, Shozo Takagi, Lawrence C Chow
    Abstract:

    The calcium phosphate Cement (CPC) used in this study was formed by combining equimolar amounts of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA). This powder, when mixed with water, sets to a hard Cement in about 30 min. However, the water-based CPC paste is not highly cohesive and is vulnerable to washout until hardening occurs. The objectives of this study were to investigate the effects on handling properties, washout resistance, Cement hardening behavior, and mechanical properties of adding several gelling agents to CPC paste. Aqueous solutions that contained a mass fraction of 2–4% of hydroxypropyl methylcellulose (HPMC), carboxyl methyl-cellulose (CMC), chitosan acetate, and chitosan lactate were used as Cement liquids. Hardening time was measured by the Gilmore needle test; resistance to washout was evaluated by the disintegration of the Cement Specimen in water with agitation; and mechanical strength was evaluated by the measurement of diametral tensile strength and compressive strength. Handling properties were greatly improved by the addition of HPMC, CMC, chitosan acetate, and chitosan lactate. Hardening time was retarded by the additions of HPMC and CMC, and mechanical strength was weakened by the addition of either the chitosan lactate or the chitosan acetate. © 1997 John Wiley & Sons, Inc. J. Biomed Mater Res, 35, 273–277, 1997.