Title: Chloride Penetration in Standard Concrete, Water-Reduced Concrete, and Superplasticized Concrete
Author(s): Walter Lukas
Publication: Symposium Paper
Appears on pages(s): 253-268
Keywords: air entrainment; chlorides; concretes; consistency
tests; corrosion resistance; deterioration; freeze-thaw durabil-ity;
plasticizers; portland cements; pozzolan cements; segrega-tion;
water-cement ratio; water-reducing agents.
Concretes display a chloride penetration which is dependent on several factors. The water-cement ratio exerts the most influence, the penetrated chloride content decreasing with a decrease in the ratio. High quality concrete with a low water-cement ratio has a considerably smaller chloride content than otherconcretes of the same consistency. Superplasticized concrete has a smaller tendency to absorb chloride than untreated concretes of the same water-cement ratio. Cements with pozzolanic additions show increased resistance to chloride diffusion into the concrete. If concretes are air entrained there is a considerable chloride concentration in the upper-most zone. This is due both to the greater segregation tendency and to the air voids themselves.