Parameters Influencing the Oxygen and Chloride Permeability of Superplasticized Normal Portland Cement and Fly Ash-Normal Portland Cement Mortar and Concrete

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Title: Parameters Influencing the Oxygen and Chloride Permeability of Superplasticized Normal Portland Cement and Fly Ash-Normal Portland Cement Mortar and Concrete

Author(s): C. J. Lynsdale and J. G. Cabera

Publication: Special Publication

Volume: 148

Issue:

Appears on pages(s): 435-450

Keywords: chlorides; compressive strength; durability; fly ash; models; mortars (material); oxygen; performance; permeability; porosity; portland cement; superplasticizers; water-cement ratio; Materials Research

Date: 9/1/1994

Abstract:
Inadequate performance of concrete structures is often caused by deficient construction practices and lack of appropriate specifications for controlling concrete properties that are related to adequate performance during the expected service life of a structure. Work carried out for many years at the Civil Engineering Materials Unit (CEMU) of the University of Leeds has shown that the durability of concrete can be assessed effectively by measuring its permeability to gases, liquids, and ions. Paper presents the findings of a laboratory study of the properties of normal portland cement and fly ash-normal portland cement mortar and concrete mixtures that influence their oxygen and chloride-ion permeability. The study involves 28 mixtures incorporating the use of five chemically different superplasticizers and three water-cementitious materials ratios. Statistical models that relate compressive strength, porosity, pore-size distribution, and water-cementitious materials ratio to oxygen and chloride-ion permeability are presented.