Water Permeability and Chloride Penetration in Lightweight and Normalweight Aggregate Concrete

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Title: Water Permeability and Chloride Penetration in Lightweight and Normalweight Aggregate Concrete

Author(s): K.S. Chia and M.H. Zhang

Publication: Special Publication

Volume: 234

Issue:

Appears on pages(s): 607-620

Keywords: chloride; concrete; lightweight aggregate; silica fume; water permeability

Date: 3/22/2006

Abstract:
This paper presents a comparative study on the water permeability and chloride penetration in lightweight and normalweight aggregate concrete (LC and NC). Water-cementitious material ratios (w/cm) of 0.35 and 0.55, and silica fume content of 0% and 10% as cement replacement were used to obtain concrete with different strength levels. In concrete mixture proportioning, the volume of the coarse aggregate for the lightweight concrete was the same as that in the corresponding normalweight concrete. The results indicated that at the strength level of 30-40 MPa, the water permeability of the LC with a w/cm of 0.55 was lower than that of the NC with equivalent w/cm when subjected to 4 MPa water pressure. However, at a w/cm of 0.35 the water permeability of LC and NC was not significantly different. The resistance of the LC to chloride ion penetration was similar to that of the corresponding NC with the same w/cm and mixture proportion. As the LC had lower compressive strength than that of the corresponding NC, the results indicated that the LC would probably have lower water permeability and better resistance to the chloride-ion penetration than the NC with equivalent 28-day compressive strength.