The Experts below are selected from a list of 37587 Experts worldwide ranked by ideXlab platform
J. C. Nadeau - One of the best experts on this subject based on the ideXlab platform.
-
a multiscale model for effective moduli of concrete incorporating itz water Cement Ratio gradients aggregate size distributions and entrapped voids
Cement and Concrete Research, 2003Co-Authors: J. C. NadeauAbstract:Abstract This paper develops a model for the effective elastic properties of concrete, which is a function of the volume fractions, size distributions, and elastic properties of fine aggregate (FA) and coarse aggregate (FA) and entrapped voids. Furthermore, the model is a function of the overall water–Cement Ratio and specific gravity of Cement. Explicitly modeled are the water–Cement Ratio gradients through the interfacial transition zone (ITZ), which, in turn, affect the variation of the Cement paste elastic properties through the ITZ, while maintaining the total fractions of Cement and water consistent with the overall water–Cement Ratio. The ITZ volume is also conserved.
-
Water–Cement Ratio gradients in mortars and corresponding effective elastic properties
Cement and Concrete Research, 2002Co-Authors: J. C. NadeauAbstract:Abstract Water–Cement Ratio gradients are modeled through the interfacial transition zone (ITZ) of a mortar with spherical inclusions. The model is a function of the over-all water–Cement Ratio, volume fraction and radius of sand, specific gravity of Cement and thickness of ITZ. Based on experimental data from the literature, the dependence of saturated, homogeneous Cement paste is modeled as a function of water–Cement Ratio. Subsequently, the effective bulk and shear moduli for mortars are determined using a generalized self-consistent method. Finally, application of the model to data in the literature pertaining to elastic wave speeds in saturated mortars composed of 20–30 screened sand with an overall water–Cement Ratio of 0.3 yielded a mean ITZ thickness of 48.3 μm.
Hisham Ibrahim - One of the best experts on this subject based on the ideXlab platform.
-
Kansas Water-Cement Ratio Meter: Preliminary Results
Transportation Research Record: Journal of the Transportation Research Board, 1996Co-Authors: Mustaque Hossain, James Koelliker, Hisham Ibrahim, John WojakowskiAbstract:The water-Cement Ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-Cement Ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-Cement Ratio in the field. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-Cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-Cement Ratio of fresh concrete with an accuracy of ±0.01 on the water-Cement Ratio scale for a single test at a 90 percent confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accurate determination of water-Cement Ratio could dramatically improve the ability of the concrete industry to ensure the quality of concrete construction.
-
Kansas Water-Cement Ratio Meter: Preliminary Results
Transportation Research Record: Journal of the Transportation Research Board, 1996Co-Authors: Mustaque Hossain, James Koelliker, Hisham Ibrahim, John WojakowskiAbstract:The water-Cement Ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-Cement Ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-Cement Ratio in the field. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-Cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-Cement Ratio of fresh concrete with an accuracy of ±0.01 on the water-Cement Ratio scale for a single test at a 90 percent confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accura...
-
DEVELOPMENT OF A WATER-Cement Ratio METER. FINAL REPORT - PHASE II
1994Co-Authors: James Koelliker, Mustaque Hossain, Hisham IbrahimAbstract:The objective of this project was to develop a water-Cement Ratio measurement meter for easy, rapid and reliable use in the field. The goal was that the equipment be portable, easy to use, low cost and low maintenance, and be able to provide consistent and accurate results. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the turbidity of water-Cement slurry separated from a concrete mixture by "pressure sieving". Consistent results were obtained for both air entrained and non-air entrained concrete. Statistical analyses of the test results have shown that the Kansas Water-Cement Ratio Meter can measure the water-Cement Ratio of fresh concrete with an accuracy of +/-0.01 with 90% confidence. The test time is less than 10 minutes which includes cleaning the equipment. Further evaluation with admixtures, and under field conditions are planned.
Mustaque Hossain - One of the best experts on this subject based on the ideXlab platform.
-
Kansas Water-Cement Ratio Meter: Preliminary Results
Transportation Research Record: Journal of the Transportation Research Board, 1996Co-Authors: Mustaque Hossain, James Koelliker, Hisham Ibrahim, John WojakowskiAbstract:The water-Cement Ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-Cement Ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-Cement Ratio in the field. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-Cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-Cement Ratio of fresh concrete with an accuracy of ±0.01 on the water-Cement Ratio scale for a single test at a 90 percent confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accurate determination of water-Cement Ratio could dramatically improve the ability of the concrete industry to ensure the quality of concrete construction.
-
Kansas Water-Cement Ratio Meter: Preliminary Results
Transportation Research Record: Journal of the Transportation Research Board, 1996Co-Authors: Mustaque Hossain, James Koelliker, Hisham Ibrahim, John WojakowskiAbstract:The water-Cement Ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-Cement Ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-Cement Ratio in the field. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-Cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-Cement Ratio of fresh concrete with an accuracy of ±0.01 on the water-Cement Ratio scale for a single test at a 90 percent confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accura...
-
DEVELOPMENT OF A WATER-Cement Ratio METER. FINAL REPORT - PHASE II
1994Co-Authors: James Koelliker, Mustaque Hossain, Hisham IbrahimAbstract:The objective of this project was to develop a water-Cement Ratio measurement meter for easy, rapid and reliable use in the field. The goal was that the equipment be portable, easy to use, low cost and low maintenance, and be able to provide consistent and accurate results. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the turbidity of water-Cement slurry separated from a concrete mixture by "pressure sieving". Consistent results were obtained for both air entrained and non-air entrained concrete. Statistical analyses of the test results have shown that the Kansas Water-Cement Ratio Meter can measure the water-Cement Ratio of fresh concrete with an accuracy of +/-0.01 with 90% confidence. The test time is less than 10 minutes which includes cleaning the equipment. Further evaluation with admixtures, and under field conditions are planned.
James Koelliker - One of the best experts on this subject based on the ideXlab platform.
-
Kansas Water-Cement Ratio Meter: Preliminary Results
Transportation Research Record: Journal of the Transportation Research Board, 1996Co-Authors: Mustaque Hossain, James Koelliker, Hisham Ibrahim, John WojakowskiAbstract:The water-Cement Ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-Cement Ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-Cement Ratio in the field. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-Cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-Cement Ratio of fresh concrete with an accuracy of ±0.01 on the water-Cement Ratio scale for a single test at a 90 percent confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accurate determination of water-Cement Ratio could dramatically improve the ability of the concrete industry to ensure the quality of concrete construction.
-
Kansas Water-Cement Ratio Meter: Preliminary Results
Transportation Research Record: Journal of the Transportation Research Board, 1996Co-Authors: Mustaque Hossain, James Koelliker, Hisham Ibrahim, John WojakowskiAbstract:The water-Cement Ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-Cement Ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-Cement Ratio in the field. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-Cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-Cement Ratio of fresh concrete with an accuracy of ±0.01 on the water-Cement Ratio scale for a single test at a 90 percent confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accura...
-
DEVELOPMENT OF A WATER-Cement Ratio METER. FINAL REPORT - PHASE II
1994Co-Authors: James Koelliker, Mustaque Hossain, Hisham IbrahimAbstract:The objective of this project was to develop a water-Cement Ratio measurement meter for easy, rapid and reliable use in the field. The goal was that the equipment be portable, easy to use, low cost and low maintenance, and be able to provide consistent and accurate results. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the turbidity of water-Cement slurry separated from a concrete mixture by "pressure sieving". Consistent results were obtained for both air entrained and non-air entrained concrete. Statistical analyses of the test results have shown that the Kansas Water-Cement Ratio Meter can measure the water-Cement Ratio of fresh concrete with an accuracy of +/-0.01 with 90% confidence. The test time is less than 10 minutes which includes cleaning the equipment. Further evaluation with admixtures, and under field conditions are planned.
John Wojakowski - One of the best experts on this subject based on the ideXlab platform.
-
Kansas Water-Cement Ratio Meter: Preliminary Results
Transportation Research Record: Journal of the Transportation Research Board, 1996Co-Authors: Mustaque Hossain, James Koelliker, Hisham Ibrahim, John WojakowskiAbstract:The water-Cement Ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-Cement Ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-Cement Ratio in the field. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-Cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-Cement Ratio of fresh concrete with an accuracy of ±0.01 on the water-Cement Ratio scale for a single test at a 90 percent confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accurate determination of water-Cement Ratio could dramatically improve the ability of the concrete industry to ensure the quality of concrete construction.
-
Kansas Water-Cement Ratio Meter: Preliminary Results
Transportation Research Record: Journal of the Transportation Research Board, 1996Co-Authors: Mustaque Hossain, James Koelliker, Hisham Ibrahim, John WojakowskiAbstract:The water-Cement Ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix. Although water-Cement Ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-Cement Ratio in the field. A prototype device has been developed to measure the water-Cement Ratio of a plastic concrete mix. The method is based on the measurement of turbidity of water-Cement slurry separated out of a concrete mixture by pressure sieving. Consistent results were obtained for air-entrained and non-air-entrained concrete. Statistical analyses of the test results have shown that this meter can measure the water-Cement Ratio of fresh concrete with an accuracy of ±0.01 on the water-Cement Ratio scale for a single test at a 90 percent confidence interval. The equipment will cost less than $10,000. If the method works as well in the field as it does in the laboratory, accura...