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International Concrete Abstracts Portal

Showing 1-5 of 13 Abstracts search results

Document: 

SP136-09

Date: 

January 1, 1993

Author(s):

T. W. Bremner, T. A. Holm, and J. M. McInerney

Publication:

Symposium Papers

Volume:

136

Abstract:

The effect of stress on the nitrogen gas permeability of structural lightweight concrete was determined using cylindrical hollow concrete specimens loaded in axial compression at the same time that a nitrogen pressure differential was maintained across the cylinder wall. The nitrogen gas flow rate across the cylinder wall was noted and concrete permeability was measuredas the load increased. Flow rates tended to remain constant up to a critical stress corresponding to the onset of unstable crack propagation, at which time the flow rate increased rapidly. Rapid increases in permeability occurred at lower levels of applied stress-to-strength ratio with normal weight concrete than with lightweight concrete.

DOI:

10.14359/4269


Document: 

SP136-04

Date: 

January 1, 1993

Author(s):

Russell Trumble and Luis Santizo

Publication:

Symposium Papers

Volume:

136

Abstract:

Project consists of a 15-story office tower and a 4-level parking structure. The advantages of lightweight concrete over other structural materials for this particular project, and the process followed for its selections, as well as different types of structural systems, are evaluated. The length of spans in both structures was a determining factor in the selection of the floor system. Lightweight concrete, 4000 psi, was chosen for the floors, and 6000-psi normal weight concrete was selected for the columns. As a first step of the design process, economic comparisons were made between concrete and structural steel. After determining that concrete was more economical, alternate floor systems were studied for constructability, function, economy, and availability of materials. Lightweight concrete was preferable for all floor systems, even though a premium cost of nearly 10 dollars per yd 3 is common for this geographic location.

DOI:

10.14359/4202


Document: 

SP136-11

Date: 

January 1, 1993

Author(s):

R. N. Swamy and E. D. Jiang

Publication:

Symposium Papers

Volume:

136

Abstract:

The problem of concrete deterioration and its durability has become a matter of great concern to everyone involved in the construction industry. Carbonation and chloride ingress are the two major sources of deterioration, and the penetration of both is influenced by the pore structure of the concrete. Paper presents data on pore structure, carbonation depths, and the interrelationship between the two in structural lightweight concrete after 10 years' outdoor exposure in an industrially polluted area. The concrete was made with expanded slate aggregate using either all lightweight aggregates or with part of the lightweight fines replaced by sand. Both cement content and water-cement ratios were varied. The results showed that the total pore volume was influenced by both the water-cement ratio and fine aggregate content of the concrete. The total pore volume was higher for concretes containing all lightweight fines than for concrete with part replacement of fines by sand. However, for a given pore volume, carbonation was higher for the concretes containing sand than for concrete containing all lightweight aggregates. This phenomenon is explained in terms of the pore structure of the concrete, and a pore structure characteristics parameter is introduced to correlate carbonation with pore volume.

DOI:

10.14359/4012


Document: 

SP136-06

Date: 

January 1, 1993

Author(s):

Mark D. Luther

Publication:

Symposium Papers

Volume:

136

Abstract:

Structural Lightweight Aggregate Concrete

DOI:

10.14359/4265


Document: 

SP136

Date: 

January 1, 1993

Author(s):

Editors: Thomas A. Holm and Alexander M. Vaysburd / Sponsored by: ACI Committee 213

Publication:

Symposium Papers

Volume:

136

Abstract:

This compilation of 12 papers addresses the performance of structural lightweight concrete, with topics ranging from fundamental laboratory studies to case histories of concrete performance. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP136

DOI:

10.14359/14168


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