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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 12 Abstracts search results
Document:
SP102
Date:
September 1, 1987
Author(s):
Editor: Frances W. Gibson
Publication:
Symposium Papers
Volume:
102
Abstract:
SP102 As a designer you need the wealth of information presented in "Corrosion, Concrete and Chlorides -- Steel Corrosion in Concrete: Causes and Restraints," a compilation of 11 papers covering the corrosion phenomenon. Prompted by the nationwide corrosion problem with concrete, there have been extensive field and laboratory investigations into the specific phenomena that induce corrosion, methods for identifying the magnitude and extent of corrosion in structures, techniques for stabilizing corrosion once it has begun, and design of structures and concretes so that corrosion will not occur. Presenting an in-depth analysis into a variety of aspects dealing with corrosion, this state-of-the-art publication includes such topics as: the marked influence of chloride in causing corrosion, ways for controlling corrosion by using chloride-free accelerators, the reduction of chloride penetration through the use of pozzolanic blast-furnace slag as an admixture in concrete, and the conductive coating aspects of cathodic protection. "Corrosion, Concrete and Chlorides" provides important answers to a complex problem.
DOI:
10.14359/14218
SP102-10
B. Erlin and W. Hime
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.
10.14359/9986
SP102-11
Richard D. GaynorI
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.
10.14359/1608
SP102-05
David Chin
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.
10.14359/1619
SP102-06
Sandor Popovics
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.
10.14359/1620
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