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  • 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.

International Concrete Abstracts Portal

Showing 1-5 of 7 Abstracts search results

Document: 

SP158-05

Date: 

January 1, 1996

Author(s):

Barry E. Scheetz and Jefferson P. Hoffer

Publication:

Symposium Papers

Volume:

158

Abstract:

The cement/silicate method of solidifying wastes was investigated. Emphasis was placed on the interaction between aqueous sodium silicate and portland cement hydration reactions. A definition of the role which the alkali- silicate plays in increasing the ability of cement hydration reactions to immobilize waste ions was the principal objective. Characterization relied upon calorimetry, X-ray diffraction, microstructural examination by scanning electron microscopy, and monitoring strength development of the waste forms. Increasing additions of sodium silicate to cement pastes accelerate hydration reactions, specifically the hydration of C 3 A and C 3 S, and decrease the presence of portlandite. Effects on compressive strengths of cement pastes were varied; at a water-cement ratio of 0.83, strengths increased with moderate sodium silicate additions, while at higher water-cement ratios, sodium silicate additions decreased strengths.

DOI:

10.14359/897


Document: 

SP158-01

Date: 

January 1, 1996

Author(s):

J. W. Gindstaff, S. C. St. John, and N. J. Antonas

Publication:

Symposium Papers

Volume:

158

Abstract:

Low-level radioactive waste (LLRW) must be disposed of in a manner that safeguards the environment and future generations. To this end, engineers should provide reasonable assurance that the proposed methods of disposal and materials of construction will function as intended throughout the design life. This paper addresses design and construction issues related to concrete for the nation's first commercial, above-grade, engineered LLRW disposal facility.

DOI:

10.14359/911


Document: 

SP158-02

Date: 

January 1, 1996

Author(s):

Nam Chau; Robert D. Baird; and Vern C. Rogers

Publication:

Symposium Papers

Volume:

158

Abstract:

Several engineered disposal technologies involving concrete structures have been proposed for low-level radioactive waste disposal. The long-term performance and behavior of reinforced concrete structures in disposal units have been examined. Under most conditions, the reinforcing steel and concrete work well together to withstand the natural forces. Under certain conditions, however, the reinforcement and concrete may be subject to environmental attack which may cause degradation of the reinforced concrete. Water infiltration through the structure may increase as a result of cracking and increasing permeability and thereby increase the potential for contaminant release. The model for estimating time to onset of reinforcing steel corrosion due to presence of chloride is presented. Requirements for design of reinforced concrete structures for low-level radioactive waste disposal facilities are suggested.

DOI:

10.14359/1431


Document: 

SP158-03

Date: 

January 1, 1996

Author(s):

Nam Chau; and Vern C. Rogers

Publication:

Symposium Papers

Volume:

158

Abstract:

Interest in the use of reinforced concrete structures in LLW disposal facilities has preceded the development of a comprehensive understanding of the long-term performance of these disposal technologies. With this in mind, Rogers and Associates Engineering Corporation has developed a new assessment computer model, restrict, that adopts a more complete, mechanistic approach to modeling concrete degradation, groundwater infiltration, leaching, and radiological risks.

DOI:

10.14359/1432


Document: 

SP158

Date: 

January 1, 1996

Author(s):

Editors: A.A. Al-Manaseer and D.M. Roy

Publication:

Symposium Papers

Volume:

158

Abstract:

SP-158 The Building Code Requirements for Masonry Structures will provide solutions to the most complex masonry construction questions. Replacing all existing masonry code, these important new ACI/ ASCE documents have been especially prepared to facilitate adoption, by reference, in a general building code. They have been adopted by B.O.C.A. and SBCC (model code groups). The code contains: a standard construction specification as part of the design standard; provisions for analytical and empirical design; provisions for seismic design; and provisions for design of brick and block composite and cavity walls. Other topics covered by the new code include: permits and drawings; quality assurance; materials; placing embedded items; strength and serviceability; flexural and axial loads; shear; walls; columns; pilasters; beams and lintels. The quality, inspection, testing and placement of materials used in construction are covered by reference to specifications and the appropriate ASTM Standards.

DOI:

10.14359/14198


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