International Concrete Abstracts Portal

Home > Publications > International Concrete Abstracts Portal

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 13 Abstracts search results

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: 

SP136-07

Date: 

January 1, 1993

Author(s):

Alexander M. Vayasburd

Publication:

Symposium Papers

Volume:

136

Abstract:

During the past three decades, lightweight aggregate concrete has emerged as an important sector of the structural concrete industry. It possesses unique properties, similar in some ways to those of normal weight concrete, but differing in significant aspects. Difficulties experienced with lightweight concrete in some projects appears to be caused by a lack of understanding of the differences between normal weight concrete and lightweight concrete as materials and differences in production technologies. It is most wisely used when treated as a material in its own right, with its special properties fully considered in design and construction. A three-phase model of lightweight concrete and its effect on durability are discussed as they relate to selection of materials, concreting and curing technology, control of in-service distress due to freezing and thawing, and corrosion of reinforcing steel. ased on the observed performance of bridge and marine structures built over the past four decades, the author presents a series of generalized observations applying to durability of lightweight concrete that provide a fair cross section of the entire experience. Paper concludes that, with proper selection of materials and design, and good construction practices, lightweight concrete offers an excellent solution to the problem of durability in severe environment.

DOI:

10.14359/4267

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: 

SP136-01

Date: 

January 1, 1993

Author(s):

George C. Hoff

Publication:

Symposium Papers

Volume:

136

Abstract:

First of a three-part paper presents the results of a joint industry project to develop high-strength lightweight aggregate concrete for use in the Arctic. Lightweight aggregate selection tests, high-strength mixture development with the selected aggregates, batching procedures, unhardened properties of the 110 batches made during the program, and the temperature development of the mixtures in large concrete sections are described. Both crushed and pelletized lightweight aggregates were used with supplementary cementing materials and high-range water reducers to produce concretes with compressive strengths from 8000 to 11,000 psi (55 to 76 MPa). Also evaluated was the influence of pumping on the aggregate moisture content, slump, unit weight, air content, and concrete strength. The effects of the air void system in the hardened pumped concrete with respect to freezing and thawing durability and the drying behavior of a large concrete section were also evaluated.

DOI:

10.14359/4008

Document: 

SP136-02

Date: 

January 1, 1993

Author(s):

George C. Hoff

Publication:

Symposium Papers

Volume:

136

Abstract:

Second of a three-part paper presents the results of a joint industry project to develop high-strength lightweight aggregate concretes for use in the Arctic and describes the mechanical properties of those concretes. Both crushed and pelletized lightweight aggregates were used with supplementary cementing materials and high-range water reducers to produce concretes with compressive strengths from 8000 to 11,000 psi (55 to 76 MPa). Other properties evaluated included modulus of elasticity, Poisson's ratio, splitting tensile strength, modulus of rupture, drying shrinkage, creep, seawater absorption, chloride ion permeability, thermal properties, air-void systems, freezing and thawing behavior, ice abrasion resistance, and adfreeze bond behavior. The effects of low temperatures on many of these properties were also evaluated. Special tests were developed to approximate Arctic conditions for freezing and thawing behavior, ice abrasion, and adfreeze bond strength.

DOI:

10.14359/4010

123

Results Per Page