Strength, Shrinkage, Hardened Air Void Characteristics of Concrete Containing Slag Cement PDF Download
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Author: Ryan David Foley
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
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Author: Ryan David Foley
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
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Author: Irene K. LaBarca
Publisher:
ISBN:
Category : Portland cement
Languages : en
Pages : 98
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Book Description
This research examined the properties of concrete containing grade 120 slag cement at replacement levels of 0%, 30%, and 50%. The primary concrete properties studied were compressive strength, split-tensile strength, and deicer scaling resistance. Material variations included four sources of ordinary portland cement and two types of coarse aggregate. Strength properties were studied at room temperature and 40°F mix and curing conditions. Deicer scaling resistance was studied for concrete cured under six curing conditions. Carbonation of concrete cured under these six conditions was also investigated.
Author: Lawrence J. Kaetzel
Publisher:
ISBN:
Category : Expert systems (Computer science)
Languages : en
Pages : 274
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Author: Hamdi Celik Ozyildirim
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 46
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The study evaluated the effect of ground, granulated, iron slags on the properties of hydraulic cement concretes such as normally used in highway construction. Two cements with different alkali contents and two slags with different activity indices, 100 and 120, were used. Slags were used as replacements for portions of Portland cement at 40%, 50%, and 65% by weight. This final report presents data on the properties of the freshly mixed concrete and the test results on time of set, heat of hydration, compressive strength, flexural strength, permeability, resistance to freezing and thawing, length change values, and the results of petrographic examinations including data on air voids, carbonation, and hydration. The test results for the laboratory specimens indicate that mixtures with the slags exhibit delay in set and slower development of compressive strength early ages than do conventional mixtures, but have equal or better strengths at Later ages. The incorporation of slag reduces the permeability of concrete considerably. It is concluded from this study that concretes in which up to 50% by weight of the cement has been replaced with a slag meeting the requirements of ASTM C989 and having a minimum activity index of 100 are satisfactory for use in highway construction.
Author:
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 19
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Observations at the Research Council, coupled with the national interest in possible changes in the air void characteristics of air-entrained concretes because of the wide use of admixtures and changes in cement properties, raised a question as to whether or not there was a progressive increase over the years in the size of air voids being incorporated in concrete. Thus, the main objective of the study reported here was to evaluate the changes in air void characteristics of hardened concrete as determined by ASTM C457 and by other means for concrete produced in Virginia from 1945 to 1980. Air void parameters including the air content, specific surface, and spacing factor --were determined on 630 concretes. The results did not indicate an overall significant increase in the size of air voids; however, it was observed that, in general, they did show that the average size and the distribution of the voids were marginal compared to generally accepted values. While this finding indicates that air voids may not be as small as optimum, the freeze-thaw performance of air-entrained concretes in Virginia supplied under the present specifications generally has been satisfactory.
Author: ACI Committee 209--Creep and Shrinkage
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 30
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Author: Hamdi Celik Ozyildirim
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 36
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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).
Author: J.C. Maso
Publisher: CRC Press
ISBN: 0203627253
Category : Architecture
Languages : en
Pages : 218
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An important new state-of-the-art report prepared by RILEM Technical Committee 108 ICC. It has been written by a team of leading international experts from the UK, USA, Canada, Israel, Germany, Denmark, South Africa, Italy and France. Research studies over recent years in the field of cement science have focused on the behaviour of the interfaces between the components of cement-based materials. The techniques used in other areas of materials science are being applied to the complex materials found in cements and concretes, and this book provides a significant survey of the present state of the art.
Author: Fulton Keller Fears
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 206
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Author: Geoffrey Frohnsdorff
Publisher: ASTM International
ISBN: 0803104537
Category : Aggregates (Building materials)
Languages : en
Pages : 170
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