The Experts below are selected from a list of 28614 Experts worldwide ranked by ideXlab platform
Y Ribakov - One of the best experts on this subject based on the ideXlab platform.
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a method for optimal design of steel fiber reinforced Concrete Composition
Materials & Design, 2011Co-Authors: L Dvorkin, O Dvorkin, V Zhitkovsky, Y RibakovAbstract:Abstract Existing design approaches for steel fiber reinforced Concrete Composition practically do not consider the interaction between the Concrete components. It decreases the design efficiency and accuracy. The paper deals with methodology for design of optimal steel fibered fine-grained Concrete Composition based on stiff mixtures. Such Concrete is used for production of thin walled precise elements. The current investigation enables to find the influence of the main factors (water–cement ratio, fiber content, fineness and quantity of sand) on the Concrete mixture stiffness, compressive and flexural strength of Concrete. The study has also enabled to obtain corresponding mathematical models of Concrete properties. Based on the models a methodology for design of steel fibered Concrete was developed and appropriate nomograms were prepared. The proposed methodology allows obtaining of optimal steel fibered fine-grained Concrete Composition, taking into account the required flexural strength of Concrete, sand fineness and Concrete mixture workability.
L Dvorkin - One of the best experts on this subject based on the ideXlab platform.
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A method for design of high strength Concrete Composition considering curing temperature and duration
Construction and Building Materials, 2018Co-Authors: L Dvorkin, V Zhitkovsky, Y. Stepasyuk, Yuri RibakovAbstract:Abstract The paper deals with experimental results on temperature and curing duration influence on strength properties of high strength Concrete (HSC). Dependences for calculating strength of high strength Concrete at 12 h, 1, 7 and 28 days are developed for normal hardening conditions. Equations, allowing considering curing temperature in diapason between 5 and 40 °C as well as curing duration are proposed. The influence of steam curing parameters on HSC strength characteristics is investigated. Methodology for predicting Concrete strength after steam curing and further normal hardening is proposed. The obtained calculation dependences and experimental-statistical models provide wide possibilities for design of effective high strength Concrete Compositions.
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a method for optimal design of steel fiber reinforced Concrete Composition
Materials & Design, 2011Co-Authors: L Dvorkin, O Dvorkin, V Zhitkovsky, Y RibakovAbstract:Abstract Existing design approaches for steel fiber reinforced Concrete Composition practically do not consider the interaction between the Concrete components. It decreases the design efficiency and accuracy. The paper deals with methodology for design of optimal steel fibered fine-grained Concrete Composition based on stiff mixtures. Such Concrete is used for production of thin walled precise elements. The current investigation enables to find the influence of the main factors (water–cement ratio, fiber content, fineness and quantity of sand) on the Concrete mixture stiffness, compressive and flexural strength of Concrete. The study has also enabled to obtain corresponding mathematical models of Concrete properties. Based on the models a methodology for design of steel fibered Concrete was developed and appropriate nomograms were prepared. The proposed methodology allows obtaining of optimal steel fibered fine-grained Concrete Composition, taking into account the required flexural strength of Concrete, sand fineness and Concrete mixture workability.
V Zhitkovsky - One of the best experts on this subject based on the ideXlab platform.
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A method for design of high strength Concrete Composition considering curing temperature and duration
Construction and Building Materials, 2018Co-Authors: L Dvorkin, V Zhitkovsky, Y. Stepasyuk, Yuri RibakovAbstract:Abstract The paper deals with experimental results on temperature and curing duration influence on strength properties of high strength Concrete (HSC). Dependences for calculating strength of high strength Concrete at 12 h, 1, 7 and 28 days are developed for normal hardening conditions. Equations, allowing considering curing temperature in diapason between 5 and 40 °C as well as curing duration are proposed. The influence of steam curing parameters on HSC strength characteristics is investigated. Methodology for predicting Concrete strength after steam curing and further normal hardening is proposed. The obtained calculation dependences and experimental-statistical models provide wide possibilities for design of effective high strength Concrete Compositions.
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a method for optimal design of steel fiber reinforced Concrete Composition
Materials & Design, 2011Co-Authors: L Dvorkin, O Dvorkin, V Zhitkovsky, Y RibakovAbstract:Abstract Existing design approaches for steel fiber reinforced Concrete Composition practically do not consider the interaction between the Concrete components. It decreases the design efficiency and accuracy. The paper deals with methodology for design of optimal steel fibered fine-grained Concrete Composition based on stiff mixtures. Such Concrete is used for production of thin walled precise elements. The current investigation enables to find the influence of the main factors (water–cement ratio, fiber content, fineness and quantity of sand) on the Concrete mixture stiffness, compressive and flexural strength of Concrete. The study has also enabled to obtain corresponding mathematical models of Concrete properties. Based on the models a methodology for design of steel fibered Concrete was developed and appropriate nomograms were prepared. The proposed methodology allows obtaining of optimal steel fibered fine-grained Concrete Composition, taking into account the required flexural strength of Concrete, sand fineness and Concrete mixture workability.
O Dvorkin - One of the best experts on this subject based on the ideXlab platform.
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a method for optimal design of steel fiber reinforced Concrete Composition
Materials & Design, 2011Co-Authors: L Dvorkin, O Dvorkin, V Zhitkovsky, Y RibakovAbstract:Abstract Existing design approaches for steel fiber reinforced Concrete Composition practically do not consider the interaction between the Concrete components. It decreases the design efficiency and accuracy. The paper deals with methodology for design of optimal steel fibered fine-grained Concrete Composition based on stiff mixtures. Such Concrete is used for production of thin walled precise elements. The current investigation enables to find the influence of the main factors (water–cement ratio, fiber content, fineness and quantity of sand) on the Concrete mixture stiffness, compressive and flexural strength of Concrete. The study has also enabled to obtain corresponding mathematical models of Concrete properties. Based on the models a methodology for design of steel fibered Concrete was developed and appropriate nomograms were prepared. The proposed methodology allows obtaining of optimal steel fibered fine-grained Concrete Composition, taking into account the required flexural strength of Concrete, sand fineness and Concrete mixture workability.
Marc Hunger - One of the best experts on this subject based on the ideXlab platform.
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Towards a more common use of Ultra-High Performance Concrete (UHPC) – development of UHPC for ready-mix and prefabrication Concrete plants
2017Co-Authors: Pr Przemek Spiesz, Marc HungerAbstract:This study addresses the development of ultra-high performance Concrete (UHPC) suitable for a mass production in conventional ready-mix and prefabrication Concrete plants. In order to facilitate the production process, curing regime and to minimize the costs, no additional treatments (e.g. thermal or steam curing) are applied to the Concrete. The Concrete Composition is optimized using the modified Andreasen & Andersen packing model. Fine and coarse aggregates in the size range of 0-6 mm are used. Steel fibres are added to increase Concrete ductility. Silica fume and limestone powder are applied to improve Concrete fresh behaviour, mechanical properties as well as durability. The developed Concrete has self-compacting properties. The mixtures are designed and tested in the laboratory, yielding at very high mechanical properties as well as high durability. Subsequently, one Concrete Composition is produced in a ready-mix Concrete plant (three batches of 1.5 m3 each) and another one in a prefab plant (two batches of 0.22 m3). A number of test samples are prepared and analysed from each batch. The developed Concretes have very high compressive strength (200 MPa), elastic modulus (70 GPa) as well as superior durability indices (e.g. chloride ingress and carbonation resistance). Moreover, for demonstration, two Concrete bridge-deck slabs (5 m x 3 m, 45 mm thick) are cast from the ready-mix Concrete and one small bridge (3 m x 1.4 m, thickness of 45-55 m) is cast in the precast plant. The two Concrete bridge slabs are proof-loaded under static and dynamic conditions, demonstrating a great performance of UHPC. The presented findings show that UHPC can be successfully produced in conventional Concrete plants and the obtained results prove the outstanding potential that UHPC has for a more common application in the construction practice.