What is the role of silica in concrete?

Fine aggregate must be ,. Chemically inert . Well graded. Free from organic & vegetative matter . Free from the presence of salts that absorbs the moisture from the atmosphere and lead to efflorescence. Rest with the increase in the content of silica there won't be any effect on durability. read more

Silica imparts strength to the concrete as it make it denser by increasing dry density and reducing the porosity. On the micro scale when we go to the demerit then it say it makes the failure more brittle ie the failure will occur with out any warning. read more

The latter evidence is used to support the theory that silica fume strengthens concrete by strengthening the bond between cement paste and aggregate. This study is designed to explain the contradictory evidence and establish the role played by silica fume in controlling the strength of concrete and its constituent materials. read more

Rheological benefits inherent in silica fume concrete allow for custom-tailoring concrete placement methods, such as very high cohesive workability, ability of fluid concrete to hold slope,and/ or long distance pumping of concrete. read more