E mail: alccofine. Web Site: www. The decrease in water demand is because of high glass content which has water repelling property. The results are similar even in other two methodologies.
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E mail: alccofine. Web Site: www. The decrease in water demand is because of high glass content which has water repelling property. The results are similar even in other two methodologies. ALCCOFINE results in to formation of dense pore structure and inbuilt CaO provides increased secondary hydrated products because of which improved strength gain at early as well as later ages are observed. Secondary hydrated products formed due to pozzolanic and Cementitious hydration reaction fills the pores.
This reduces the permeability of hydrated products to great extent and protects concrete from chemical attack. Under durability water permeability and chloride penetration were measured most commonly. Engineers are, by nature, fascinated and indeed obsessed, by high strength and very high strength concrete. Misconception is widely-held that high strength concretes are, per se, highly durable. The impetus for higher and higher concrete strengths also came from demands for exceptional increases in the height of high-rise buildings and for long span bridges.
Such concretes generally suffer from two major weaknesses i. Thus concept of strength through durability become essential. Chloride ion penetration is the most frequently specified durability criterion for a long term service life of concrete structures.
Title of ASTM C ASTM C says that this test method is applicable to types of concrete where correlations have been established between this test procedure and long term chloride penetration by ponding method.
ASTM C ,clause1. Packing effect retards ingression of aggressive agents in concrete even by diffusion and thus enhances durability of concrete. The concrete sample for durability test used was having same proportion as in sample Methodology A. According to this test the cubes were initially water-cured for 28 days, and then exposed to water pressure of 5 bars for 72 hours after which the cube was divided and the depth of water penetration measured.
Penetration of less than 25 mm is generally considered to be impermeable concrete. This refines the concrete microstructure and enhances the degree of impermeability and the strength characteristics of concrete.
The slabs used were water cured for 28 days. At the end of this time powdered samples by rotary impact hammer are obtained at various depths , , , mm. Chloride content of the sample from each depth were determined and reported. Thus, it reduces the penetration of chlorides in concrete and protects embedded steel from corrosion. Denser pore matrix restricts chloride penetration and alkalinity forms passive layer on steel and protect it from corrosion. Durability test measuring the water permeability showed better results than the Silica Fume.
In spite of its high fineness it does not increase water demand at the dosage range of 5 to 15 percent of normal OPC in general. In fact concrete slump is seen to be improved, due to the dense packing of cementitious material, producing low void content. Strength development increases drastically at early ages and the later on strengths are higher compared to traditional supplementary cementitious material due to its unique PSD.
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Article Tools Print this article. Under durability water permeability and chloride penetration were measured most commonly. Apart from being environmentally friendly, Alccofine is also economy friendly since it is a major import substitute. Alccofine Site powered by Weebly. Elevated temperatures effects on