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International Concrete Abstracts Portal

Showing 1-3 of 3 Abstracts search results

Document: 

100-M26

Date: 

May 1, 2003

Author(s):

Yilmaz Akkaya, Amoz Eckerson, Maria S. Konsta-Gdoutos, and Surendra P. Shah

Publication:

Materials Journal

Volume:

100

Issue:

3

Abstract:

The Bahá’í House of Worship is one of the most famous exposed aggregate concrete structures in the world. The stairs at the main entry of the building were cast and placed in 1942 and has combated the weathering elements of Wilmette, Ill., a northern Chicago suburb, for more than 50 years. The stairs were replaced in 1989 due to deterioration. These replacement stairs, however, have exhibited characteristics of accelerated deterioration. This research project addresses the historical references of the original concrete work done, past testing and investigations of the concrete structure, and a performance evaluation by mechanical and microstructural tests of both the 1942 original concrete and 1989 restoration concrete. It is found that one of the causes of the deterioration of the 1989 restoration concrete is a weak paste matrix. The cause of deterioration of the 1942 original concrete is a weak aggregate-matrix interface.

DOI:

10.14359/12623


Document: 

97-M27

Date: 

March 1, 2000

Author(s):

Weihua Jin, Christian Meyer, and Stephen Baxter

Publication:

Materials Journal

Volume:

97

Issue:

2

Abstract:

Post-consumer glass represents a major component of solid waste, yet its use as an aggregate in concrete is problematic because of the strong alkali-silica reaction (ASR) between the cement paste and the glass aggregate. In a research project at Columbia University, the use of crushed waste glass as aggregate for concrete products was investigated. Fundamental aspects of ASR in concrete with glass aggregate were studied. It was shown that waste glass ground to U.S. standard sieve size No. 50 or smaller causes mortar bar expansions in the ASTM C 1260 test of less than 0.1%, which is less than that of reference bars without any glass. Also, green glass does not cause any expansion to speak of, and finely ground green glass has the potential of an inexpensive ASR suppressant. Specific concrete products with glass aggregate are currently under development. These include concrete masonry blocks with 10% mixed-color waste glass aggregate and “glascrete” products with 100% color-sorted glass aggregate for numerous architectural and decorative applications.

DOI:

10.14359/825


Document: 

91-M09

Date: 

January 1, 1994

Author(s):

ACI Committee 301

Publication:

Materials Journal

Volume:

91

Issue:

1

Abstract:

These specifications are a reference standard which the engineer or architect may make applicable to any building project by citing them in the project specifications. He supplements them as needed by designating or specifying individual project requirements. The document covers materials and proportioning of concrete; reinforcing and prestressing steels; production, placing, and curing of concrete; and formwork design and construction. Methods of treatment of joints and embedded items, repair of surface defects, and finishing of formed surfaces are specified. Separate chapters are devoted to slab construction and finishing, architectural concrete, massive concrete, and materials and methods for constructing post-tensioned concrete. Provisions governing testing, evaluation, and acceptance of concrete as well as for acceptance of the structure are included.

DOI:

10.14359/4452


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