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International Concrete Abstracts Portal

Showing 1-5 of 18 Abstracts search results

Document: 

SP223-10

Date: 

October 1, 2004

Author(s):

Bryant Mather

Publication:

Symposium Papers

Volume:

223

Abstract:

Concrete has suffered damage as a consequence of the reaction, in the concrete, of sulfate ion and the tricalcium-aluminate (C3A) constituent of portland cement or hydration products of C3A to form ettringite. This damage, which was first reported in 1892, can be avoided if the concrete is protected from potentially harmful amounts of sulfate ion or potentially harmful amounts of C3A. Other physical and physical-chemical phenomena that have had or could have had or might have done damage to concrete have been described in the literature.

DOI:

10.14359/13502


Document: 

SP223-17

Date: 

October 1, 2004

Author(s):

Bryant Mather

Publication:

Symposium Papers

Volume:

223

Abstract:

In a letter in the September 2000 issue of Concrete International, D. Srinivasan asked, "Will there be a self-curing concrete?" My answer to this is strongly affirmative for three reasons. First, most of the concrete that is produced and placed each year all over the world already does self-cure. Some of it wasn’t intended to have anything done to its exterior surface. But finishing did in fact take place, and yet the concrete’s ability to serve its intended purpose had not been significantly reduced.

DOI:

10.14359/13509


Document: 

SP223-01

Date: 

October 1, 2004

Author(s):

Bryant Mather

Publication:

Symposium Papers

Volume:

223

Abstract:

Concrete is international, but made locally; has infinite variability, but can be made very uniform; and can be made to last as long as you want it to. Therefore, what is needed to more fully realize its potential as a construction material is to understand what we want it to do, learn how to make it so it will do so, use available methods to restrict undesired variability, consider the ethical and environmental aspects of its use, and help the people who are making it to do it better.

DOI:

10.14359/13493


Document: 

SP223-09

Date: 

October 1, 2004

Author(s):

Bryant Mather

Publication:

Symposium Papers

Volume:

223

Abstract:

The phenomena related to the formation of hydrated sulfates in concrete, or in aggregates, cement pastes, or mortars, have been investigated for many years for a variety of purposes. The cyclic immersion of aggregate particles in solutions of sodium or magnesium sulfate, followed by drying, is the basis of one of the oldest procedures employed to develop data purported to relate to aggregate "soundness." The storage of mortar specimens in sulfate solutions is the basis of many tests for sulfate resistance of cements. Sulfate-resistance testing procedures in which the mortar is mixed with added sulfate and the specimens are stored in water are in widespread use. These latter procedures are similar to procedures employed in studies of expansive cements.

DOI:

10.14359/13501


Document: 

SP223-14

Date: 

October 1, 2004

Author(s):

Bryant Mather

Publication:

Symposium Papers

Volume:

223

Abstract:

No one could question the appropriateness of "Research on Concrete" as a topic for a Stanton Walker Lecture on the Materials Sciences. Research, according to Webster’s Dictionary, is "critical and exhaustive investigation or experimentation having as its aim the discovery of new facts and their correct interpretation; the revision of accepted conclusions, theories, or laws, in the light of newly discovered facts; or the practical applications of such new or revised conclusions." Dr. Bates noted, in the first of these lectures in 1963,1 that it had recently been said that "concrete is not a material, it is a process." However, in 1967, when the American Concrete Institute finally got around to publishing an official definition of concrete,2 hat definition read: "A composite material which consists essentially of a binding medium within which are embedded particles or fragments of aggregate; in portland cement concrete, the binder is a mixture of portland cement and water."

DOI:

10.14359/13506


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