The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Lev Khazanovich - One of the best experts on this subject based on the ideXlab platform.
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Freeze–Thaw Durability and Salt Scaling Resistance Assessment of Portland Cement Concrete Composite Pavement
Transportation Research Record: Journal of the Transportation Research Board, 2012Co-Authors: Mary Vancura, Derek Tompkins, Lev KhazanovichAbstract:The SHRP 2 R21 project on composite pavement investigated the Durability of various mixtures of portland cement concrete (PCC) used in the construction of a two-layer composite PCC pavement. Project consultants in Europe, where composite PCC over PCC pavement was more common than in the United States, advised the R21 research team to consider using the CIF (capillary suction, internal damage, and Freeze–Thaw) standard of the International Union of Laboratories and Experts in Construction Materials, Systems, and Structures (RILEM), Paris, rather than the familiar ASTM standards. As a result, the R21 project adopted the RILEM CIF standard to evaluate the Freeze–Thaw Durability and salt scaling resistance of concretes. The research also explored a modified RILEM CIF test (using pure water instead of a sodium chloride solution in scaling tests) alongside the standard RILEM CIF tests. The paper describes this experience to expose other institutions and agencies in the United States to the RILEM standards for the Freeze–Thaw Durability and salt scaling resistance testing of concretes.
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Freeze-Thaw Durability and Salt Scaling Resistance Assessment of Portland Cement Concrete Composite Pavement
Transportation Research Record, 2012Co-Authors: Mary Vancura, Derek Tompkins, Lev KhazanovichAbstract:The SHRP 2 R21 project on composite pavement investigated the Durability of various mixtures of portland cement concrete (PCC) used in the construction of a two-layer composite PCC pavement. Project consultants in Europe, where composite PCC over PCC pavement was more common than in the United States, advised the R21 research team to consider using the CIF (capillary suction, internal damage, and Freeze-Thaw) standard of the International Union of Laboratories and Experts in Construction Materials, Systems, and Structures (RILEM), Paris, rather than the familiar ASTM standards. As a result, the R21 project adopted the RILEM CIF standard to evaluate the Freeze-Thaw Durability and salt scaling resistance of concretes. The research also explored a modified RILEM CIF test (using pure water instead of a sodium chloride solution in scaling tests) alongside the standard RILEM CIF tests. The paper describes this experience to expose other institutions and agencies in the United States to the RILEM standards for t...
Alan Richardson - One of the best experts on this subject based on the ideXlab platform.
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Freeze/Thaw Durability of concrete with synthetic fibre additions
Cold Regions Science and Technology, 2012Co-Authors: Alan Richardson, Kathryn Coventry, Sean WilkinsonAbstract:Concrete can be affected by Freeze/Thaw damage from the point of placing to being fully cured. The lack of available test data in the early life performance of concrete, with polypropylene fibre additions was a key factor justifying this research. This work examines the effects of Freeze/Thaw cycles starting at 5 days of curing where the concrete has reached about half of the design strength. The test methods used to evaluate Durability were weight loss, final compressive strength and relative pulse velocity. A Freeze/Thaw test was carried to ASTM 666 B for 300 cycles and enhanced Freeze/Thaw protection was observed by the use of Type 1 polypropylene fibres in concrete when compared to plain and air entrained concrete. Fibres had the ability to entrain air and this is believed to be part of the reason for the demonstrated improvement in Freeze/Thaw Durability.
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Freeze Thaw Durability of concrete with synthetic fibre additions
Cold Regions Science and Technology, 2012Co-Authors: Alan Richardson, Kathryn Coventry, Sean WilkinsonAbstract:Concrete can be affected by Freeze/Thaw damage from the point of placing to being fully cured. The lack of available test data in the early life performance of concrete, with polypropylene fibre additions was a key factor justifying this research. This work examines the effects of Freeze/Thaw cycles starting at 5 days of curing where the concrete has reached about half of the design strength. The test methods used to evaluate Durability were weight loss, final compressive strength and relative pulse velocity. A Freeze/Thaw test was carried to ASTM 666 B for 300 cycles and enhanced Freeze/Thaw protection was observed by the use of Type 1 polypropylene fibres in concrete when compared to plain and air entrained concrete. Fibres had the ability to entrain air and this is believed to be part of the reason for the demonstrated improvement in Freeze/Thaw Durability.
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Freeze Thaw Durability of concrete with recycled demolition aggregate compared to virgin aggregate concrete
Journal of Cleaner Production, 2011Co-Authors: Alan Richardson, Kathryn Coventry, Jennifer BaconAbstract:Abstract An increasing trend towards the use of sustainable processes has led to recycled materials being incorporated into concrete. It is generally recognised that crushed recycled construction aggregate material produces concrete of a lower compressive strength, when used as an aggregate replacement due to deleterious materials within the aggregate. It is generally accepted that in the UK, Freeze/Thaw attack is, after chloride-induced corrosion, the most common cause of concrete deterioration. This paper addresses the Freeze/Thaw Durability of recycled aggregate concrete using a paired comparison test based upon weight loss and final compressive strength. Recycled aggregate concrete was found to be of at least equal Durability to concrete manufactured with virgin aggregates. This was due to careful selection of the replacement aggregate and treatment prior to batching. Durability is an important material property and recycled aggregates need to be widely tested to gain confidence for use within the industry and this work shows future possibilities.
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Freeze/Thaw Durability of concrete with recycled demolition aggregate compared to virgin aggregate concrete
Journal of Cleaner Production, 2010Co-Authors: Alan Richardson, Kathryn Coventry, Jennifer BaconAbstract:Abstract An increasing trend towards the use of sustainable processes has led to recycled materials being incorporated into concrete. It is generally recognised that crushed recycled construction aggregate material produces concrete of a lower compressive strength, when used as an aggregate replacement due to deleterious materials within the aggregate. It is generally accepted that in the UK, Freeze/Thaw attack is, after chloride-induced corrosion, the most common cause of concrete deterioration. This paper addresses the Freeze/Thaw Durability of recycled aggregate concrete using a paired comparison test based upon weight loss and final compressive strength. Recycled aggregate concrete was found to be of at least equal Durability to concrete manufactured with virgin aggregates. This was due to careful selection of the replacement aggregate and treatment prior to batching. Durability is an important material property and recycled aggregates need to be widely tested to gain confidence for use within the industry and this work shows future possibilities.
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Early life Freeze/Thaw Durability of Type 1 polypropylene fibre and ground granulated blast furnace slag concretes
2010Co-Authors: Alan Richardson, Kathryn CoventryAbstract:This investigation considers the Freeze/Thaw Durability characteristics of concrete produced with the addition of polypropylene fibres and ground granulated blast furnace slag (GGBS). Previous work [Richardson 2005] has shown monofilament fibres to be instrumental in maintaining the integrity of early life concrete when subject to Freeze/Thaw cycles. This work expands upon the earlier data collection by introducing a bye product (GGBS) as a partial cement replacement. The test methodology allows comparisons to be drawn between fibre and non fibre concretes with and without GGBS. Concrete cubes cured to four days were subjected to a maximum of 50 Freeze/Thaw cycles. It was found that there was a clear association with the use of monofilament fibres in concrete with regard to enhanced Durability qualities, when compared to plain PC concrete and concrete mixes with partial GGBS cement replacement.
Mary Vancura - One of the best experts on this subject based on the ideXlab platform.
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Freeze–Thaw Durability and Salt Scaling Resistance Assessment of Portland Cement Concrete Composite Pavement
Transportation Research Record: Journal of the Transportation Research Board, 2012Co-Authors: Mary Vancura, Derek Tompkins, Lev KhazanovichAbstract:The SHRP 2 R21 project on composite pavement investigated the Durability of various mixtures of portland cement concrete (PCC) used in the construction of a two-layer composite PCC pavement. Project consultants in Europe, where composite PCC over PCC pavement was more common than in the United States, advised the R21 research team to consider using the CIF (capillary suction, internal damage, and Freeze–Thaw) standard of the International Union of Laboratories and Experts in Construction Materials, Systems, and Structures (RILEM), Paris, rather than the familiar ASTM standards. As a result, the R21 project adopted the RILEM CIF standard to evaluate the Freeze–Thaw Durability and salt scaling resistance of concretes. The research also explored a modified RILEM CIF test (using pure water instead of a sodium chloride solution in scaling tests) alongside the standard RILEM CIF tests. The paper describes this experience to expose other institutions and agencies in the United States to the RILEM standards for the Freeze–Thaw Durability and salt scaling resistance testing of concretes.
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Freeze-Thaw Durability and Salt Scaling Resistance Assessment of Portland Cement Concrete Composite Pavement
Transportation Research Record, 2012Co-Authors: Mary Vancura, Derek Tompkins, Lev KhazanovichAbstract:The SHRP 2 R21 project on composite pavement investigated the Durability of various mixtures of portland cement concrete (PCC) used in the construction of a two-layer composite PCC pavement. Project consultants in Europe, where composite PCC over PCC pavement was more common than in the United States, advised the R21 research team to consider using the CIF (capillary suction, internal damage, and Freeze-Thaw) standard of the International Union of Laboratories and Experts in Construction Materials, Systems, and Structures (RILEM), Paris, rather than the familiar ASTM standards. As a result, the R21 project adopted the RILEM CIF standard to evaluate the Freeze-Thaw Durability and salt scaling resistance of concretes. The research also explored a modified RILEM CIF test (using pure water instead of a sodium chloride solution in scaling tests) alongside the standard RILEM CIF tests. The paper describes this experience to expose other institutions and agencies in the United States to the RILEM standards for t...
Kathryn Coventry - One of the best experts on this subject based on the ideXlab platform.
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Freeze/Thaw Durability of concrete with synthetic fibre additions
Cold Regions Science and Technology, 2012Co-Authors: Alan Richardson, Kathryn Coventry, Sean WilkinsonAbstract:Concrete can be affected by Freeze/Thaw damage from the point of placing to being fully cured. The lack of available test data in the early life performance of concrete, with polypropylene fibre additions was a key factor justifying this research. This work examines the effects of Freeze/Thaw cycles starting at 5 days of curing where the concrete has reached about half of the design strength. The test methods used to evaluate Durability were weight loss, final compressive strength and relative pulse velocity. A Freeze/Thaw test was carried to ASTM 666 B for 300 cycles and enhanced Freeze/Thaw protection was observed by the use of Type 1 polypropylene fibres in concrete when compared to plain and air entrained concrete. Fibres had the ability to entrain air and this is believed to be part of the reason for the demonstrated improvement in Freeze/Thaw Durability.
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Freeze Thaw Durability of concrete with synthetic fibre additions
Cold Regions Science and Technology, 2012Co-Authors: Alan Richardson, Kathryn Coventry, Sean WilkinsonAbstract:Concrete can be affected by Freeze/Thaw damage from the point of placing to being fully cured. The lack of available test data in the early life performance of concrete, with polypropylene fibre additions was a key factor justifying this research. This work examines the effects of Freeze/Thaw cycles starting at 5 days of curing where the concrete has reached about half of the design strength. The test methods used to evaluate Durability were weight loss, final compressive strength and relative pulse velocity. A Freeze/Thaw test was carried to ASTM 666 B for 300 cycles and enhanced Freeze/Thaw protection was observed by the use of Type 1 polypropylene fibres in concrete when compared to plain and air entrained concrete. Fibres had the ability to entrain air and this is believed to be part of the reason for the demonstrated improvement in Freeze/Thaw Durability.
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Freeze Thaw Durability of concrete with recycled demolition aggregate compared to virgin aggregate concrete
Journal of Cleaner Production, 2011Co-Authors: Alan Richardson, Kathryn Coventry, Jennifer BaconAbstract:Abstract An increasing trend towards the use of sustainable processes has led to recycled materials being incorporated into concrete. It is generally recognised that crushed recycled construction aggregate material produces concrete of a lower compressive strength, when used as an aggregate replacement due to deleterious materials within the aggregate. It is generally accepted that in the UK, Freeze/Thaw attack is, after chloride-induced corrosion, the most common cause of concrete deterioration. This paper addresses the Freeze/Thaw Durability of recycled aggregate concrete using a paired comparison test based upon weight loss and final compressive strength. Recycled aggregate concrete was found to be of at least equal Durability to concrete manufactured with virgin aggregates. This was due to careful selection of the replacement aggregate and treatment prior to batching. Durability is an important material property and recycled aggregates need to be widely tested to gain confidence for use within the industry and this work shows future possibilities.
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Freeze/Thaw Durability of concrete with recycled demolition aggregate compared to virgin aggregate concrete
Journal of Cleaner Production, 2010Co-Authors: Alan Richardson, Kathryn Coventry, Jennifer BaconAbstract:Abstract An increasing trend towards the use of sustainable processes has led to recycled materials being incorporated into concrete. It is generally recognised that crushed recycled construction aggregate material produces concrete of a lower compressive strength, when used as an aggregate replacement due to deleterious materials within the aggregate. It is generally accepted that in the UK, Freeze/Thaw attack is, after chloride-induced corrosion, the most common cause of concrete deterioration. This paper addresses the Freeze/Thaw Durability of recycled aggregate concrete using a paired comparison test based upon weight loss and final compressive strength. Recycled aggregate concrete was found to be of at least equal Durability to concrete manufactured with virgin aggregates. This was due to careful selection of the replacement aggregate and treatment prior to batching. Durability is an important material property and recycled aggregates need to be widely tested to gain confidence for use within the industry and this work shows future possibilities.
-
Early life Freeze/Thaw Durability of Type 1 polypropylene fibre and ground granulated blast furnace slag concretes
2010Co-Authors: Alan Richardson, Kathryn CoventryAbstract:This investigation considers the Freeze/Thaw Durability characteristics of concrete produced with the addition of polypropylene fibres and ground granulated blast furnace slag (GGBS). Previous work [Richardson 2005] has shown monofilament fibres to be instrumental in maintaining the integrity of early life concrete when subject to Freeze/Thaw cycles. This work expands upon the earlier data collection by introducing a bye product (GGBS) as a partial cement replacement. The test methodology allows comparisons to be drawn between fibre and non fibre concretes with and without GGBS. Concrete cubes cured to four days were subjected to a maximum of 50 Freeze/Thaw cycles. It was found that there was a clear association with the use of monofilament fibres in concrete with regard to enhanced Durability qualities, when compared to plain PC concrete and concrete mixes with partial GGBS cement replacement.
Tommy Nantung - One of the best experts on this subject based on the ideXlab platform.
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Quick Determination of Freeze–Thaw Durability of Concrete Aggregates Using the Indiana Department of Transportation Hydraulic Fracture Test Equipment
Transportation Research Record, 2015Co-Authors: Belayneh Desta, Mark Snyder, Nancy Whiting, Jan Olek, Tommy NantungAbstract:The Freeze–Thaw Durability of carbonate aggregates can vary greatly, from durable to highly susceptible to Freeze–Thaw distress. Using nondurable aggregate in concrete pavement exposed to Freeze–Thaw cycles may lead to serious distress and greatly decrease the pavement’s service life. The testing needed to identify Freeze–Thaw durable aggregates can take several months to complete. The main objective of this study was to develop a reliable, quick test method for determining the Freeze–Thaw resistance of carbonate aggregates quarried in Indiana by using the hydraulic fracture test (HFT) equipment. Aggregate samples collected from 18 quarried carbonate sources that represented a range of Freeze–Thaw performance were subjected to HFT with the modified Indiana Department of Transportation (Indiana DOT) HFT equipment. Aggregates from the same sources were also used to produce concrete beams that were subjected to the Indiana DOT-modified AASHTO T161-B Freeze–Thaw test. This test evaluated the dilation of beams...
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quick determination of Freeze Thaw Durability of concrete aggregates using the indiana department of transportation hydraulic fracture test equipment
Transportation Research Record, 2015Co-Authors: Belayneh Desta, Mark Snyder, Nancy Whiting, Jan Olek, Tommy NantungAbstract:The Freeze–Thaw Durability of carbonate aggregates can vary greatly, from durable to highly susceptible to Freeze–Thaw distress. Using nondurable aggregate in concrete pavement exposed to Freeze–Thaw cycles may lead to serious distress and greatly decrease the pavement’s service life. The testing needed to identify Freeze–Thaw durable aggregates can take several months to complete. The main objective of this study was to develop a reliable, quick test method for determining the Freeze–Thaw resistance of carbonate aggregates quarried in Indiana by using the hydraulic fracture test (HFT) equipment. Aggregate samples collected from 18 quarried carbonate sources that represented a range of Freeze–Thaw performance were subjected to HFT with the modified Indiana Department of Transportation (Indiana DOT) HFT equipment. Aggregates from the same sources were also used to produce concrete beams that were subjected to the Indiana DOT-modified AASHTO T161-B Freeze–Thaw test. This test evaluated the dilation of beams...
