What Effects Will Sand Ratio Have on Concrete Performance?
The sand ratio of concrete mixing station formula refers to the percentage of sand in aggregate that accounts for the sum of sand and stone, and the sand ratio is one of the key parameters of concrete mix proportion. In concrete system, mortar composed of sand and cementitious material slurry fills the pores between stones and wraps them on their surfaces to play a lubricating role. Therefore, compared with stones, sand has a larger specific surface area, and the change of sand ratio will lead to the change of aggregate total surface area, as well as the change of aggregate porosity and relative content of coarse aggregate, thus affecting the workability of concrete mixture and the strength and durability of hardened concrete. (1) Influence of sand ratio on fluidity Under the condition of a certain amount of slurry, mortar is filled and wrapped on the surface of aggregate to reduce the friction resistance between coarse aggregates and play a role in overall lubrication. When the sand ratio is too small, the mortar composed of slurry and sand is relatively small,...
