Crushed limestone : a centuries-old history in the service of a modern building

history limestone rubble

Limestone formed in marine basins of the residues of the shells of shellfish, animal skeletons and chemical precipitation.It turned out as a result of the impact of groundwater on the organic residues.This is evidence of thousands of years of life on the planet.

Popular monuments - the Egyptian pyramids and the Great Wall of China is composed of limestone.Crushed limestone, technical details of which were already known in ancient times, served as the basis of Moscow construction.It is because of its color is called white-stone capital.

properties and characteristics of gravel

Dolomite crushed stone is resistant to temperature changes and has a high impact resistance, it is harmless and environmentally friendly.He has a small water absorption and water saturation, high frost resistance.A small amount of impurities may give him a red, white, yellow or brown.

Compared to granite, it has a lower radiation activity and more binding properties of the products it has an excellent quality.Bulk durability factor had much lower than that of the granite, and thus less flow of the gravel.Its cost is much lower than in other species.The lack of just one - relatively low strength.

It is also important that quality as the flakiness or the degree of flatness (from the word "bream" or "flat as bream").The lower the score, the more dense is compaction.

Best rubble - cube-shaped, its flakiness index of about 10%, in such a mixture is almost no voids.When using the cube-shaped rubble lowest consumption binder solution.Use a gravel as a facing stone, the construction of roads with little traffic load, in the production of lime, Portland cement, soda, mineral fertilizers, calcium carbide, to strengthen the glass, in the manufacture of concrete, and in the printing industry.

Fractional variety rubble

dolomite is available in 3 fractions (grain size in mm):

• 5-20;
• 20-40;
• 40-70.

Crushed limestone 5-20 are more likely to serve as fillers in the manufacture of concrete.Small concrete structures are also made most of this very small fraction.From this construct roads with small bandwidth.Sometimes used for cladding buildings.It is this fraction is used as raw material in the production of lime.

Crushed limestone for which is crushed to fractions 20-40, demand more than others.The foundation of it turns out perfect.The tracks and platforms, slept this faction, remain attractive for a long time.Production of medium-sized concrete structures and arrangement of roads - the main purpose of this faction.Also veneer building them and used in the production of lime.

Crushed 40-70 in isolation is rarely used.Because it makes ballast layer of gravel or pillows for roads, railway embankments and tram paintings, made massive concrete structures.Facing building this fraction is rarely, only in very large projects.For the production of lime, this fraction accounts for further crush.

Lime macadam 20-40 - indispensable in the construction of the bulk material.This is an excellent binder and filler.The strength and frost resistance provide good roads and buildings to the vagaries of our climate, which in winter is completely merciless.