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International Concrete Abstracts Portal

Showing 1-5 of 12 Abstracts search results

Document: 

SP102-10

Date: 

September 1, 1987

Author(s):

B. Erlin and W. Hime

Publication:

Symposium Papers

Volume:

102

Abstract:

Based on a studu of manu structures that have suff eredfrrom damage due to chloride-in duc ed corrosion of reinforced steel, it appears that even the more stringent limits on chloride now being proposed may be too lenient. Further, only determinations of total chloride may provide a basis for rea-sonable assurance against future corrosion.

DOI:

10.14359/9986


Document: 

SP102-07

Date: 

September 1, 1987

Author(s):

Jere H. Rose

Publication:

Symposium Papers

Volume:

102

Abstract:

The availability of separately ground granulated iron blast-furnace (GGBF) slag, as a separate cementitious material or supplement, has prompted new research on its effects on concrete properties. One area in which GGBF slag has particular promise in concrete is its ability to alter the permeability characteristics of concrete to the extent that its resistance to chloride intrusion is significantly improved. This paper discusses the ability of GGBF slag-cement mixtures to reduce the potential detrimental effects of chloride intrusion into concrete. Three test methods for chloride penetration were used and the results of each are discussed. The following conclusions were developed. 1. Significant reductions in permeability are achieved as the replacement level of the slag increases from 40 to 65% of total cementitious material by mass. 2. The permeability of concrete containing GGBF slag is less affected by increases in water-cement ratio than concrete containing regular portland cement alone. 3. The detrimental effects of accelerated curing on the permeability of concrete are virtually eliminated with cement blends containing GGBF slag greater than 50%. 4. Concrete containing GGBF slag may require less depth of cover to protect the reinforcing steel than those concretes using portland cement alone.

DOI:

10.14359/1621


Document: 

SP102-06

Date: 

September 1, 1987

Author(s):

Sandor Popovics

Publication:

Symposium Papers

Volume:

102

Abstract:

Strength-increasing effects of achloride-free accelerating admixture are investigated on various portland cement pastes, mortars and concretes with or without other admixtures. Although the test results are preliminary in nature, the available experimental evidence shows that this chloride-free accelerator increases significantly the strengths of a wide variety of cementitious compositions including portland cement, epoxy, pozzolans and combinations of these.

DOI:

10.14359/1620


Document: 

SP102-05

Date: 

September 1, 1987

Author(s):

David Chin

Publication:

Symposium Papers

Volume:

102

Abstract:

Two important properties of calcium nitrite are that it is an accelerator and a corrosion inhibitor when used as an admixture in concrete. With its performance as an accelerator enhanced, calcium nitrite can be used as an effective non-corrosive, non-chloride accelerator in normal and fly ash concrete. The calcium nitrite-based accelerator provides good accelera-tion in initial setting times at 50°F (10°C) and 72°F (22°C) produces a significant improvement in compressive strengths at early ages. Electrochemical solution tests can be used to conduct a quick screening test to determine the potential corrosivity of a non-chloride accelerator. Potential and linear polarization resistance measurement tests provide a quick indication regarding the potential corrosivity of a non-chloride accelerator.

DOI:

10.14359/1619


Document: 

SP102-11

Date: 

September 1, 1987

Author(s):

Richard D. GaynorI

Publication:

Symposium Papers

Volume:

102

Abstract:

During the past few years, there has been a dramatic change in the atti-tude of specifiers and concrete technologists toward the use of calcium chloride in concrete. Traditionally, admixtures containing chlorides have been banned from use in prestressed concrete, and increasingly it has been recognized that they should not be used in concrete over galvanized metal decks. In 1977, ACI Committee 201 in the Guide to Durable Concrete rec-ommended the limits shown in Table 1 for the water-soluble chloride ion con-tent of concrete, expressed as a percentage of weight of the cement. In 1983, the ACI Building Code 318-83 adopted the similar, but somewhat more liberal, limits in Table 2.

DOI:

10.14359/1608


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