Access Restriction

Author Collepardi, M.
Source CiteSeerX
Content type Text
File Format PDF
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Marine Environment ♦ Concrete Durability ♦ Aggressive Agent ♦ Reinforced Concrete Structure ♦ Alkali Ion ♦ Alkali-reactive Aggregate ♦ Portland Cement ♦ Cementitious Binder ♦ Sulfate Attack ♦ Sea Water ♦ Damage Process ♦ Metallic Bar ♦ Main Factor ♦ Water-cement Ratio ♦ Chloride Ion ♦ Furnace Slag ♦ Holistic Model ♦ Following Measure ♦ Specific Aggressive Action ♦ Concrete Structure ♦ Cement Paste ♦ Fly Ash ♦ Present Paper ♦ Mineral Addition
Abstract Synopsis: The holistic model of the damage process of reinforced concrete structures is preliminary shown in the present paper by examining the coexistence of the main factors affecting the concrete durability: a) interconnected porosity, b) exposure to aggressive agents, and c) presence of water. In particular, this model is adopted to examine the durability of reinforced concrete structures exposed to a marine environment. At least three aggressive agents in sea water can cause deterioration of the reinforced concrete structures: chloride, sulfate and alkali ions. The specific aggressive action of each aggressive agent is examined: corrosion of the metallic bars caused by chloride ions, damage of the cement paste carried out by sulfate attack, and swelling disruption of concrete if alkali-reactive aggregates are present in the concrete. In order to prevent the damage of concrete structures exposed to a marine environment the following measures should be adopted: to reduce the water-cement ratio by using superplasticizers; to employ cementitious binders based on the combination of portland cement with mineral addition such as fly ash and/or blast furnace slag.
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study