Concrete Materials: Properties, Specifications and Testing by Sandor Popovics

By Sandor Popovics

This e-book provides an in-depth method of concrete constituents and their relationships to concrete by means of discussing their houses, pertinent attempt equipment, requirements, right use and choice, and recommendations to difficulties in perform. The technique is perform orientated, and the e-book assists within the more advantageous software of concrete via an intensive figuring out of its components. this can be aided by way of the dialogue of yes primary facets and relationships in quantitative varieties, and through additionally offering the translation of study and adventure. an in depth bibliography is integrated. The e-book is a present, equipped precis of information bearing on concrete-making fabrics, that allows you to permit the engineer/user to make the very best product utilizing those fabrics.

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Additional info for Concrete Materials: Properties, Specifications and Testing

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T Portland Cement-Types, Properties, and Specifications 47 prediction of water need of the same cement in a concrete. The reason for this paradox is that the two tests measure two different properties of the cement paste: The Vicat measures primarily the test viscosity [Cusens 19731, whereas the result of the slump test is influenced mostly by the lubricating capability of the paste. These two paste properties are not correlated, or at least the relationship is not a simple linear one [Popovics 1982al.

L Fineness of Cement The term fineness or fineness of grinding refers to the average size of the cement particles. A higher fineness means a more finely ground cement, smaller The significance of fineness lies in the particles. fact that it affects several technically important properties of cement and concrete. For instance, the higher the fineness, the higher compressive strengths are developed at early ages. [Gruenwald 1939, Higginson 1970, Kondo 1972, Reinsdorf 19621. 5 and Fig. 51, contributes to better workability [Vivian 19661, and shows less autoclave expansion as well.

4-mm) depth of penetration of the needle divided by the area of the bearing face of the Time of initial setting is defined as the needle. 45 MPa). 6 MPa) The shape of the convex portion of the stiffenig - versus - curing time curve in Fig. 11 suggests that it can be approximated either by an exponential or by a power function. curve The exponential approximation has been applied by Polivka and Klein for the Proctor penetration resistance versus curing time relation [Polivka 19601. 12: A Gillmore needle for testing the time of setting of cement pastes (ASTM C X6-77).

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