By V.S. Ramachandran

Because the book of the 1st version ten years in the past, major advancements have happened within the use of admixtures in concrete. 8 new chapters and an entire replace of the previous ten chapters carry this ebook modern; reflecting the relative advances made within the technological know-how and expertise of other teams of admixtures. The elevated function and improvement of admixtures in concrete know-how is evidenced by way of a few meetings, courses, and novel admixtures out there position.

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Extra info for Concrete Admixtures Handbook: Properties, Science, and Technology

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The mechanism of hydration of individual cement components and that of cement itself has been a subject of much discussion and disagreement. In the earliest theory, Le Chatelier explained the cementing action by dissolution of anhydrous compounds followed by the precipitation of interlocking crystalline hydrated compounds. [l9] In recent years the topochemical or solid state mechanism has been proposed. In spite of a large amount of work, even the mechanism of hydration of C,S, the major phase of cement, is not clear.

1 1 E F F E C T I V E P O R E D I A M E T E R , pm Figure 9. Hg intrusion curves for a series of hydrating C,S pastes. 6 Surface Area and Hydraulic Radius Surface Area. This is the area available to gases or liquids by way of pores and the external area. Hydrated portland cement is very complex and there is controversy over the sigmficance of H,O as an adsorbate in determining surface area. With water as adsorbate, the surface area is about 200 m2/g and remains constant for different w/c ratio pastes.

Subsequenttreatment, such as wetting and drying and application of stress, also affects these properties. The low angle x-ray scattering data of Winslow et al. [49] Hydraulic Radius. The average characteristic of a pore structure can be represented by the hydraulic radius which is obtained by dividing the total pore volume by the total surface area. 8. Calculation of the hydraulic radius of the interlayer space can be done by knowing the surface area of the interlayer space (total surface area less surface area of capillary space) and the volume of the interlayer space.

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