Title : A LABORATORY STUDY ON THE PERFORMANCE OF SILANE BAED HYDROPHOBIC COATINGS ON CONCRETE
Authors : V.V.L. Kanta Rao,Sushil Kumar,Lakshmy, P.and R.K.Garg
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Price : 250
Abstract : Durability of cement concrete is affected by many causes such as corrosion of steel reinforcement, alkali-silica reaction, sulphate attack, freeze-thaw attack, etc. These causes are manifested in concrete structures through cracking and/or spalling of concrete. Permeability of concrete is responsible in influencing the durability; higher the permeability of concrete, lower is the durability. Many National and International standards have focussed on this issue and suggested methods to be considered to achieve enhanced durability while designing the structures. The mechanism of almost all the causes which affect the durability involves water / moisture. When the ingress of moisture into concrete, through its pores is restricted, many of the durability concerns of concrete can be controlled / eliminated. A well-recognised and adopted approach to reduce permeability of concrete involve modifying the structure of concrete i.e. by reducing its permeability through use of supplementary cementitious admixtures such as fly ash, silica fume or ground granulated blast furnace slag, and/or use of low w/c ratio for concrete mixes. An alternative method is the application of hydrophobic coatings on concrete surface. For this purpose, various types of coatings, based on organic or inorganic materials, are available. This paper discusses about different methods to improve the durability of concrete, and presents some of the test results of experimental evaluation carried out in CRRI on concrete specimen coated with octyltriethoxysilane and siloxane based materials.