A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Validating the Durability of Corrosion Resistant Mineral Admixture Concrete
The objectives of this research are to validate chloride diffusion coefficients of mineral admixture concrete mix designs currently developed by the Caltrans for corrosion mitigation, and to verify the adequacy of existing measures to mitigate corrosion caused by exposure to marine environments and deicing salt applications. To this end, this research includes a comprehensive literature review on relevant topics, a laboratory investigation and a modeling effort. Various laboratory tests were conducted to investigate the compressive strength of and chloride diffusivity in mortar and concrete samples with cement partially replaced by various minerals (class F and class N fly ash, ultra-fine fly ash, silica fume, metakaolin and ground granulated blast-furnace slag), the porosity of mineral concretes, the freeze-thaw resistance of mineral mortars in the presence of deicers, and the effect of mineral admixtures on the chloride binding and chemistry of the pore solution in mortar. The modeling effort explores the important features of ionic transport in concrete and develops a two-dimensional finite-element-method (FEM) model coupled with the stochastic technique. The numerical model is then used to examine the service life of reinforced concrete as a function of mix design (i.e., partial replacement of cement by mineral admixtures), concrete cover depth, surface chloride concentrations, and presence of cracks and coarse aggregates.
Validating the Durability of Corrosion Resistant Mineral Admixture Concrete
The objectives of this research are to validate chloride diffusion coefficients of mineral admixture concrete mix designs currently developed by the Caltrans for corrosion mitigation, and to verify the adequacy of existing measures to mitigate corrosion caused by exposure to marine environments and deicing salt applications. To this end, this research includes a comprehensive literature review on relevant topics, a laboratory investigation and a modeling effort. Various laboratory tests were conducted to investigate the compressive strength of and chloride diffusivity in mortar and concrete samples with cement partially replaced by various minerals (class F and class N fly ash, ultra-fine fly ash, silica fume, metakaolin and ground granulated blast-furnace slag), the porosity of mineral concretes, the freeze-thaw resistance of mineral mortars in the presence of deicers, and the effect of mineral admixtures on the chloride binding and chemistry of the pore solution in mortar. The modeling effort explores the important features of ionic transport in concrete and develops a two-dimensional finite-element-method (FEM) model coupled with the stochastic technique. The numerical model is then used to examine the service life of reinforced concrete as a function of mix design (i.e., partial replacement of cement by mineral admixtures), concrete cover depth, surface chloride concentrations, and presence of cracks and coarse aggregates.
Validating the Durability of Corrosion Resistant Mineral Admixture Concrete
X. Shi (author) / Y. Liu (author) / Z. Yang (author) / M. Berry (author) / P. K. Rajaraman (author)
2010
179 pages
Report
No indication
English
Construction Equipment, Materials, & Supplies , Highway Engineering , Corrosion & Corrosion Inhibition , Construction Materials, Components, & Equipment , Mineral Industries , Corrision resistance , Concrete durability , Fly ash , Silica fume , Slag , Cementitious materials , Rebar corrosions , Reinforced concrete , Chloride ingress , Service life predictions , Additives , Mineral admixture concretes , Environmentally friendly concretes
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