Properties of Fresh Concrete: Proceedings of the by H.J. Wierig PDF

Methods Materials

By H.J. Wierig

ISBN-10: 0412374307

ISBN-13: 9780412374302

This publication offers new details on concrete homes and creation within the mild of the frequent use of prepared combined concrete and new concreting fabrics. This publication types the lawsuits of the RILEM Colloquium held in Hanover, West Germany in October 1990. Papers from 18 nations in Europe, North the USA and the a long way East are integrated.

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Extra resources for Properties of Fresh Concrete: Proceedings of the International RILEM Colloquium (RILEM Proceedings 10)

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It was discovered that the stabilizing effect (up to an hour) on the workability, brought about by additives in cement paste, could not be repeated with concrete. Already fifteen minutes after mixing, the workability of hot fresh concrete is reduced; after 30–40 minutes all fresh concrete specimens reach the maximum allowed grade of stiffness of 40 seconds (according to the USSR-standard). Stabilizing the grade of stiffening of the fresh concrete between 20–30 seconds for up to one hour could only be attained by increasing the chemical 40 Fig.

The conditions which prevail in deep wells (high temperature and pressure, presence of corrosive media (sour gases, salts, electrolyte solutions)) aggravate the task of satisfying the requirements just mentioned. For improving the quality of the cement mantle, therefore, especially stringent demands are imposed on the gauge accuracy of the borehole, cementation technique, properties of the cement slurry as well as on the hardened cement paste, and thus on drilling cements. In the present paper, the special requirements on drilling cements and the possibilities of realizing these demands are discussed.

Chemical and mineralogical components of the clinker. 2 31 Fig. 1. 4 Due to the higher solubility of hemihydrate compared to anhydrite, this means varying the sulphate ready to react from sulphate excess to sulphate deficiency. Bleeding was tested by applying a modified procedure of the ‘Lieber’-test. 852. The mixing procedure was improved compared with the original method by using a stirring apparatus with a propeller stirrer. A sample of 100 ml from the cement paste was filled into a measuring glass.

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Properties of Fresh Concrete: Proceedings of the International RILEM Colloquium (RILEM Proceedings 10) by H.J. Wierig

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