Rehabbing the U.S

Article Abstract:

Reinforced concrete buildingsalso require restoration because they succumb to aging and deterioration causedby chemicals and weather conditions. However, preventive measures may alleviatedeterioration and reduce the need for rehabilitation. Periodic washdowns can decrease the seepage of chlorides into parking decks, marine structures, tunnels and bridges. Sealers can serve as grouts to fill out cracks. Reinforcing steel needs anti-corrosion protection and the addition of superplasticers to the concrete mixture can provide better protection.

Buildings, Maintenance and repair, Reinforced concrete construction

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Safeguarding steel

Article Abstract:

High-performance coating systems have replaced paints in protecting steel surfaces from corrosion. Among the more effective coatings are those which contain micaceous iron oxide (MIO), inorganic zinc or urethane. MIO forms a micropermeable layer that simultaneously allows trapped moisture to evaporate while preventing external moisture from being absorbed. Inorganic zinc is a quick-drying and self-curing coating that can last 25 years, while urethane is a very durable and corrosion-resistant topcoat that works well with epoxy.

Industrial organic chemicals, not elsewhere classified, Chemical preparations, not elsewhere classified, Inorganic pigments, Usage, Corrosion and anti-corrosives, Corrosion, Protective coatings, Urethane

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A look ahead

Article Abstract:

Engineers assess the prospects of reinforced concrete in the future. Ed Cohen of Ammann and Whitney sees the need to develop better nondestructive evaluation methods to assess reinforcing conditions. Terry Holland of Master Builders stresses the need to improve durability in terms of high performance and anti-corrosion methods. Bob Prisby of ElKem predicts that improvements in materials and construction methods will continue and that additives, especially microsilica, offer good prospects for strengthening concrete materials.

Evaluation, Forecasts and trends, Building materials, Engineers

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