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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 14 Abstracts search results
Document:
SP249
Date:
March 1, 2008
Author(s):
Editors: R.Detwiler, K.Folliard, J.Olek, J.S. Popovics, and L.Snell / Sponsored by: ACI Publications Committee and ACI Committee 120
Publication:
Symposium Papers
Volume:
249
Abstract:
SP-249 This publication is a collection of 13 papers that have significantly influenced the field of concrete and cement-based materials over the years. The subject matter of the selected landmark papers represents a broad range of topics, from the analysis of the chemical composition of portland cement to the development of fracture models of concrete in computational simulations. The objective of this publication was to increase awareness of the significance of concrete materials research as a whole and therefore raise the profile of the field. In this volume, each landmark paper is preceded by a foreword written by an expert on the specific topic of the paper. Editorial in nature, these forewords serve to guide the reader through the content of the paper, to illuminate the significance of its contribution to the technical community, and in some cases, to reveal interesting historical context on the landmark work and its authors.
DOI:
10.14359/19748
SP249-01
Thomas E. Stanton
Due to copyright issues, this paper is only available by purchasing the SP-249. Tests have demonstrated that excessive expansion of concrete may occur through chemical reactions between cements of relativley high alkali content and certain mineral constituents in some aggregates, such as certain types of shales, cherts, and impure limestones found along the coast of California between Monterey Bay on the north and Los Angeles County on the south. A new test procedure is described in this paper through which it is possible, in a comparatively short time, to develop the deleterious characteristics of cement-aggregate combinations similar to those reported in the California study. The procedure consists of curing the specimens in sealed containers at normal temperatures.
Due to copyright issues, this paper is only available by purchasing the SP-249.
10.14359/20122
SP249-05
D.A. Abrams
A discussion preceding a demonstration of actual field proportioning of concrete by Stanton Walker. Mr. Walker has prepared a resume of the methods used which appears on p. 182 of this volume.
10.14359/20126
SP249-04
H.F.W. Taylor
Due to copyright issues, this paper is only available by purchasing the SP-249. Hydrous calcium silicates prepared at room temperature appear amorphous, but X-ray photographs show that compounds are formed having a considerable degree of crystalline character. Essentially the same product, calcium silicate hydrate (I), can be obtained by the action of water on tricalcium silicate, by double decomposition of calcium nitrate and sodium silicate, or by reaction of calcium hydroxide solution with silica gel, although crystallisation is more mared in the first cae. The composition of this phase varies between approximately CaO,SiO2,aq. and 3CaO,2SiO2,aq. Without significant change in X-ray pattern. The phase relationships between solid and solution have been investigated and are sufficiently reproducible to suggest that the results represent a fair approximation to equilibrium conditions. A second phase, calcium silicate hydrate (II), with a composition in the neighbrourhood of 2CaO,SiO3,aq. And an X-ray pattern differeing only slightly from the above, has been obtained by decomposition of tricalcium silicate and probably exists in equilibrium with calcium hydroxide solutions containing over 1-13 g./l. of CaO. A tentative interpretation fo the X-ray data of calcium silicate hydrate (I) suggests a layer structure, possibly showing some similaritites to the clay minerals.
10.14359/20125
SP249-03
R.S. Barneyback Jr. and S. Diamond
Due to copyright issues, this paper is only available by purchasing the SP-249. A device is described that has been used for several years for expression of pore solution from hardened portland cement pastes and mortars. Particulars with respect to the design, fabrication, and operation of such equipment are given, and methods for the analysis of the resulting small volumes of pore solutions are briefly discussed. It is believed that the compositions of the pore solutions obtained are representative of that of the bulk of the pore solution within the paste or mortar from which the solutions have been obtained.
10.14359/20124
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