Concrete is the construction material necessary for the device of the bases, partitions and other designs. The quality of concrete is affected by such indicator as density. The density is higher, the concrete is stronger.
Density of heavy and lightweight-aggregate concrete
The weight of concrete is defined by its density. Producers divide concrete into brands and classes, proceeding from its density. Easy classes are used in individual construction, and the concrete of high specific weight is necessary at large-scale construction.
Density is the most important property of concrete, and it is equal to ratio of weight to volume. The consistency value never reaches 100% as in it in the course of production time appears. The latest technologies are developed for increase in density and reduction of porosity. They are oriented to use of the expanding structures and introduction of optimum temperature condition when hardening concrete.
Ways of increase in density of concrete
There are several ways for increase in density of concrete. It is possible to enter hydraulic raises into concrete mix: semi-water plaster, bentonite clay, pumice. Activization of strength indicators of concrete is promoted by use of the plasticizing poverkhtnostno-active additives. At increase in density there is increase in strength indicators of material. The following method of increase in density of concrete is addition in its composition of soluble glass. The amount of glass should not exceed 40% of cement lump. The most effective way of increase in density of concrete weight is decrease in content of water.
For what purpose increase concrete density
Density of concrete increases due to consolidation of mix and evaporation of excess water owing to what raises: - corrosive firmness; - durability; - frost resistance; - water tightness. On the density concrete can be structural, heat-insulating or constructional and heat-insulating. For receiving cellular material carry out buckling of concrete mix. And for production of special purpose concrete the knitting structures are used. Refer to them heat-resistant, radio protective, sulfuric, hydrotechnical and other types of concrete. It is possible to prepare absolutely dense mix only in industrial conditions. Increase in density is reached by size reduction of granules of filler therefore the volume of air and amount of emptiness decreases. The less water as a part of concrete, the it is more dense. The most available and most labor-consuming way of consolidation of concrete – use of special vibrators or manual pins. Procedure purpose: reduction of the accumulated air and removal of water. It is possible to increase density of concrete weight in the way of the accelerated heating of solution and intensive moisture elimination.