Paper Title
SULPHATE RESISTANCE OF TERNARY BLENDED FIIBER REINFORCED CONCRETE
Abstract
Concrete is most used construction material because of ease of construction and its properties like compressive strength and durability. It is difficult to point out another material of construction which is versatile as concrete. It is well known that plain concrete is not good to sulphate resistance Most of the soils contain some sulphate in the form of calcium, sodium, potassium and magnesium. Higher concentration of sulphate in ground water is generally due to the presence of magnesium and alkali sulphates. Sea water contains the sodium, magnesium and calcium sulphate in the dissolved form. Sulphate is the common occurrence in sea water environments.
Several admixtures have been developed to improve the strength and workability properties of concrete, of all admixtures used in concrete micro silica occupies a special position for a quite reasons as follows. The improvement in durability resistance to chloride, sulphate, freezing and thawing, alkali aggregate reaction, frost attack, increase in compressive strength, reduces the permeability and bleeding. Micro silica effectively improve the structure of interface eliminate the weakness of the interfacial zone. In the past, attempt has been made to improve sulphate resistance of concrete. This paper reports the results from laboratory studies on the durability of concrete that contains terinary blends of Portland cement, micro silica and flyash. Concretes made with these proportions generally show excellent fresh and hardened properties since the combination of micro silica and flyash is somewhat synergistic. For instance, flyash appears to compensate for some of the workability problems often associated with the use of higher levels of micro silica, whereas the micro silica appears to compensate for the relatively low early strength of fly ash concrete. Furthermore, these data indicate that the diffusivity of the concrete that contains ternary blends continues to decrease with age
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