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http://dx.doi.org/10.4334/JKCI.2002.14.1.100

Resistance In Chloride ion Penetration and Pore Structure of Concrete Containing Pozzolanic Admixtures  

소양섭 (전북대학교 건축학부)
소형석 (서남대학교 건축공학부)
Publication Information
Journal of the Korea Concrete Institute / v.14, no.1, 2002 , pp. 100-109 More about this Journal
Abstract
Significant damage to concrete results from the intrusion of corrosive solutions, for example, dissolved chlorides corrode reinforcing steel and cause spatting. Effectively blocks the penetration of these solutions will eliminate or greatly reduce this damage and lead to increased durability. This study is to investigate the effects of pozzolanic admixtures, fly ash and silica fume, and a blast furnace slag on the chloride ion penetration of concretes. The main experimental variables wore the water-cementitious material ratios, the types and amount of admixtures, and the curing time. And it is tested for the porosity and pore size distributions of cement paste, chloride ion permeability based on electrical conductance, and 180-day ponding test for chloride intrusion. The results show that the resistance of concrete to the penetration of chloride ions increases as the w/c was decreased, and the increasing of curing time. Also, concrete with pozzolans exhibited higher resistance to chloride ion penetration than the plain concrete. The significant reduction in chloride ion permeability(charge passed) of concrete with pozzolans due to formation of a discontinuous macro-pore system which inhibits flow. It is shown that there is a relationship between chloride ion permeability and depth of chloride ion penetration of concrete, based on the pore structure (porosity and pore size distributions) of cement paste.
Keywords
pozzolans; chlorides ion permeability; porosity; pore size distributions; depth of chloride ion penetration;
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Times Cited By KSCI : 1  (Citation Analysis)
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