Specification of machine made sand for construction

2021-08-27

Specification of machine-made sand for construction

Construction sand requires fine aggregate with a particle size of less than 4.75 mm and a fineness modulus of MX 3.7 to 1.6.
Sand for construction is divided into:
1. The clastic sediments of rivers, lakes, and seas with a small amount of rock fragments and muddy mainly composed of quartz particles are called natural sand;
2. Artificial mechanical crushing of hard and unweathered rock is called machine-made sand;
3. The mixture of the above two is called mixed sand. Machine-made sand and mixed sand are collectively referred to as artificial sand. 75% of sand is used as concrete aggregate. Concrete is an artificial stone that is hardened after mixing cement, water, sand and coarse aggregate pebbles. The amount of sand accounts for about 30% to 60%.

In order to reasonably apply the sand and gravel production line to produce suitable machine-made sand, sufficient sand and gravel demand on the market, and replace natural sand as a new generation member of the construction industry, the country has specific standards for the size of engineering gravel materials to ensure construction The safety performance of objects.

The type of machine-made sand
Machine-made sand is made by mechanical crushing and sieving. Rock particles with a particle size of less than 4.75mm, but excluding soft rock and weathered rock particles.
Extra-fine sand: Natural river sand with a fineness modulus of 0.7-1.5 obtained according to the method specified in >(GB/T 14684).
Mixed sand: sand made by mixing machine-made sand and ultra-fine sand.
Machine-made sand concrete: concrete prepared with machine-made sand as fine aggregate.
Mixed sand concrete: concrete prepared with mixed sand as fine aggregate.
Plastic concrete: concrete with a concrete mixture slump of 10-90mm.
High-fluidity concrete: concrete whose slump of the concrete mixture is equal to or greater than 160mm.
Pumping concrete: concrete with a slump of the concrete mixture not less than 100mm and pumping construction.
The scope of application of different types of machine-made sand is also different. Therefore, when purchasing sand and gravel production line equipment, it is necessary to select the appropriate sand and gravel production line to produce high-selling machine-made sand in accordance with the needs of consumers.