International Journal of Materials Chemistry and Physics
Articles Information
International Journal of Materials Chemistry and Physics, Vol.1, No.1, Aug. 2015, Pub. Date: Jul. 9, 2015
Protection of Bio-Deteriorated Reinforced Concrete Using Concrete Sealers
Pages: 11-19 Views: 2169 Downloads: 1955
Authors
[01] Rajesh K. Verma, Environmental Science & Technology Group, CSIR-Central Building Research Institute, Roorkee, India.
[02] Ajay Chourasia, Structural Engineering Group, CSIR-Central Building Research Institute, Roorkee, India.
Abstract
Concrete, a most durable building material is mainly composed of water, aggregate and cement. It provides superior fire resistance compared with wooden construction and gains strength over time. Structures made of concrete can have a long service life. Reinforced concrete (RC) is a composite material in which concrete’s relatively low tensile strength and ductility are counteracted by the inclusion of reinforcement having higher tensile strength and/or ductility. The reinforcement is usually, though not necessarily, steel reinforcing bars (rebar) and is usually embedded passively in the concrete before the concrete sets. Reinforcing schemes are generally designed to resist tensile stresses in particular regions of the concrete that might cause unacceptable cracking and/or structural failure. Concrete can be damaged by many processes, such as the expansion of corrosion products of the steel reinforcement bars, freezing of trapped water, fire or radiant heat, aggregate expansion, sea water effects, bacterial corrosion, leaching, erosion by fast-flowing water, physical damage and chemical damage. Many building structures undergo bio-deterioration when exposed to contact with soil, water and sewage as well as food, agricultural products and waste materials. Concrete sealers are applied to concrete to protect it from surface damage, corrosion, and staining. They either block the pores in the concrete to reduce absorption of water and salts or form an impermeable layer which prevents such materials from passing. Sealers are one of the most problematic and misunderstood aspects of concrete countertops. There is no review literature available about protection of reinforced concrete using concrete sealers. The present review includes reinforced concrete, hydration chemistry of portland cement, bio-deterioration of concrete and various types of concrete sealers for protection of reinforced concrete structures.
Keywords
Reinforced Concrete, Cement Hydration, Bio-Deterioration, Concrete Sealers
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