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Distribution Of Voids In Field Concrete
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Book Synopsis Distribution of Voids in Field Concrete by : Hamdi Celik Ozyildirim
Download or read book Distribution of Voids in Field Concrete written by Hamdi Celik Ozyildirim and published by . This book was released on 1978 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study was intended to evaluate the air void characteristics of concrete in an attempt to identify, quantitatively or semi-quantitatively, different types of voids and to predict their influence on strength and durability. At the outset, it was anticipated that total air contents and water-- cement ratios of concrete mixtures would reflect the presence of excess water or air voids. However, because it is difficult to determine the water-cement ratio of hardened concrete, an attempt was made to relate the water-cement ratio and the air content, taken as independent variables, to the parameters of the void system that are .readily determined from the hardened concrete. The parameters of the void system considered were 1. The specific surface and the spacing factor calculated from linear traverse data. 2. The constants of a continuous chord frequency distribution curve derived from a probability density function. 3. The mean diameters and the number of bubbles per unit volume determined by a graphical method. The concrete samples were prepared in the laboratory, and the variables included the amount of air entrainment, the water cement ratio, the mixing time, and the mixture temperature. The data on the void system were obtained by utilizing the chord lengths of voids determined by the linear traverse analysis of concrete specimens. Within the framework of the study it was not possible to correlate the combined effect of water and air content with the above mentioned void parameters. A good correlation was obtained between the air contents of fresh and hardened concretes that were properly measured. Satisfactory relationships were established between the measures of resistance to freezing and thawing (weight loss, relative dynamic modulus of elasticity, and the surface rating), and certain parameters-of the void system (the spacing factor, the specific surface, and the diameter of the bubbles).
Book Synopsis Expert/knowledge-based Systems for Cement and Concrete by : Lawrence J. Kaetzel
Download or read book Expert/knowledge-based Systems for Cement and Concrete written by Lawrence J. Kaetzel and published by . This book was released on 1991 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Significance of Tests and Properties of Concrete and Concrete-making Materials by : Paul Klieger
Download or read book Significance of Tests and Properties of Concrete and Concrete-making Materials written by Paul Klieger and published by ASTM International. This book was released on 1994 with total page 621 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computational Modelling of Concrete Structures by : Günther Meschke
Download or read book Computational Modelling of Concrete Structures written by Günther Meschke and published by CRC Press. This book was released on 2018-01-31 with total page 1034 pages. Available in PDF, EPUB and Kindle. Book excerpt: The EURO-C conference series (Split 1984, Zell am See 1990, Innsbruck 1994, Badgastein 1998, St. Johann im Pongau 2003, Mayrhofen 2006, Schladming 2010, St. Anton am Arlberg 2014, and Bad Hofgastein 2018) brings together researchers and practising engineers concerned with theoretical, algorithmic and validation aspects associated with computational simulations of concrete and concrete structures. Computational Modelling of Concrete Structures reviews and discusses research advancements and the applicability and robustness of methods and models for reliable analysis of complex concrete, reinforced concrete and pre-stressed concrete structures in engineering practice. The contributions cover both computational mechanics and computational modelling aspects of the analysis and design of concrete and concrete structures: Multi-scale cement and concrete research: experiments and modelling Aging concrete: from very early ages to decades-long durability Advances in material modelling of plain concrete Analysis of reinforced concrete structures Steel-concrete interaction, fibre-reinforced concrete, and masonry Dynamic behaviour: from seismic retrofit to impact simulation Computational Modelling of Concrete Structures is of special interest to academics and researchers in computational concrete mechanics, as well as industry experts in complex nonlinear simulations of concrete structures.
Book Synopsis Comparison of Air Void Content Measurements in Fresh Versus Hardened Concretes by : Hamdi Celik Ozyildirim
Download or read book Comparison of Air Void Content Measurements in Fresh Versus Hardened Concretes written by Hamdi Celik Ozyildirim and published by . This book was released on 1990 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study compares the air content of freshly mixed and hardened concretes. At the fresh stage, pressure meters (Types A and B) and a volumetric meter were used to determine the air content. At the hardened stage, the air content was calculated using the linear traverse method described in ASTM C 457, which is a microscopical procedure. The unit weight and compressive strength of the concretes were also determined. The results show that, at the ranges commonly used in the construction of pavements and bridges, the air content of fresh concrete measured by pressure meters and that determined by the microscopical method for essentially the same concrete after hardening are, for practical purposes, the same. The air content obtained by a volumetric meter as normally run in the field is generally lower than that obtained for the same hardened concretes by the microscopical method. The unit weight and compressive strength correlate well with the air content. It was also shown that adding water to concrete can significantly increase the air content, as well as the slump. Thus, a higher air content in hardened concretes than that indicated by initial measurements with a pressure meter is likely to be present if water is added during placement.
Book Synopsis Significance of Tests and Properties of Concrete and Concrete-making Materials by : Joseph F. Lamond
Download or read book Significance of Tests and Properties of Concrete and Concrete-making Materials written by Joseph F. Lamond and published by ASTM International. This book was released on 2006 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Concrete Structures Part-II, 2nd Edition by : Zahid Ahmad Siddiqi
Download or read book Concrete Structures Part-II, 2nd Edition written by Zahid Ahmad Siddiqi and published by Zahid Ahmad Siddiqi. This book was released on 2012-02-22 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is prepared according to the 2011 ACI Code for buildings and AASHTO LRFD Specifications for bridges. The units used throughout the presentation are the SI units according to the official system of units in Pakistan. As in Part-I of the same series of books, it is tried that the three main phases of structural design, namely load determination, design calculations and detailing together are introduced to the beginner. Besides reinforced concrete design, basics of formwork design, plain concrete properties and repair / rehabilitation of concrete structures are also presented. This book is useful with the 1st part of the same book. Suggestions for further improvement of the presentation will be highly appreciated and will be incorporated in the future editions.
Book Synopsis Pervious Concrete Pavements by : Paul D. Tennis
Download or read book Pervious Concrete Pavements written by Paul D. Tennis and published by . This book was released on 2004 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis INFLUENCE OF AIR-VOID SYSTEM ON FREEZE-THAW DURABILITY OF CONCRETE. by : ZAFAR AHMED MALIK
Download or read book INFLUENCE OF AIR-VOID SYSTEM ON FREEZE-THAW DURABILITY OF CONCRETE. written by ZAFAR AHMED MALIK and published by . This book was released on 1991 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two-way analysis of variance showed that type of air entraining agent, quality of aggregate, and content of condensed silica fume have a major effect on freeze-thaw durability of concrete.
Download or read book Engineering and Contracting written by and published by . This book was released on 1916 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering & Contracting written by and published by . This book was released on 1916 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Significance of Tests and Properties of Concrete and Concrete-Making Materials by :
Download or read book Significance of Tests and Properties of Concrete and Concrete-Making Materials written by and published by ASTM International. This book was released on 1978 with total page 875 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Field Study of Air Content Stability in the Slipform Paving Process by :
Download or read book Field Study of Air Content Stability in the Slipform Paving Process written by and published by . This book was released on 2012 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated the impacts of construction on the air content and air-void system structure of Portland cement concrete pavements. The primary intent was to quantify the air content of fresh concrete before and after it has gone through the slipform paver. The air-void system parameters of hardened concrete were then assessed using cast and extracted core specimens. The results of the air content testing on fresh concrete and the concrete cylinder specimens cast in the field suggested that there is some loss of air as the concrete passes through the paver. Laboratory testing performed on cores extracted from the pavement did not provide any conclusive evidence that entrained air is lost during the slipform paving process. In fact, many of the extracted cores had measured air content values that were much higher than the specification requirement. If excessive, this could result in increased permeability and low-strength related issues. Although a rigorous statistical analysis was not performed, the results suggest that the air content testing on fresh concrete is not capturing the true air content of the concrete placed with a slipform paver. The fresh concrete air content is generally lower than the air content measured in the cores.
Book Synopsis NBS Monograph by : United States. National Bureau of Standards
Download or read book NBS Monograph written by United States. National Bureau of Standards and published by . This book was released on 1962 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Specifications for Structural Concrete, ACI 301-05, with Selected ACI References by : American Concrete Institute
Download or read book Specifications for Structural Concrete, ACI 301-05, with Selected ACI References written by American Concrete Institute and published by American Concrete Institute. This book was released on 2005 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite-Element Modelling of Structural Concrete by : Michael D. Kotsovos
Download or read book Finite-Element Modelling of Structural Concrete written by Michael D. Kotsovos and published by CRC Press. This book was released on 2015-05-20 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Powerful Tool for the Analysis and Design of Complex Structural ElementsFinite-Element Modelling of Structural Concrete: Short-Term Static and Dynamic Loading Conditions presents a finite-element model of structural concrete under short-term loading, covering the whole range of short-term loading conditions, from static (monotonic and cyclic) to
Book Synopsis Ultimate Limit-state Design of Concrete Structures by : M. D. Kotsovos
Download or read book Ultimate Limit-state Design of Concrete Structures written by M. D. Kotsovos and published by Thomas Telford. This book was released on 1999 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural concrete members often show great deviation in structural performance from that predicted by the current code of practice. In certain cases the predications considerably underestimate the capabilities of a structure or member, while in others the predictions are unsafe as they overestimate the member's ability to perform in a prescribed manner. Clearly, a rational and unified design methodology is still lacking for structural concrete. This book presents a simplified methodology based on calculations which are quick, easily programmable and no more complex than those required by the current codes. It involves identifying the regions of a structural member or structure through which the external load is transmitted from its point of application to the supports and then strengthening these regions as required. As most of these regions enclose the trajectories of internal compression actions the technique has been called the 'compressive force path' method. Ultimate limit-state design for concrete structures will provide designers with a practical and easily applied method for the design of a concrete structure, which is fully compatible with the behaviour of concrete (as described by valid experimental evidence) at both the material and structural level.
