The sand is the main component material composed of concrete and mortar, the bulk of civil engineering materials. The sand is generally divided into the natural sand and artificial sand two categories. The role of natural conditions (mainly the weathering of rocks) and the formation of particle size less than 5mm of rock particles, known as the natural sand. Artificial sand, sand, by the addition to soil treatment, by mechanical crushing, screening made of particle size less than 4.75mm rock particles. But does not include soft rock, weathered rock particles. The specifications of the sand fineness modulus (characterization of the degree of the thickness of the natural sand particle size and types of indicators) is divided into coarse, medium and small three kinds.

Coarse sand: the fineness modulus of 3.7-3.1, with an average particle size of more than 0.5mm.
In the sand: fineness modulus to 3.0-2.3, with an average particle size of 0.5-0.35mm.
The fineness of the fine sand: template 2.2-1.6, with an average particle size of 0.35-0.25mm.
The extra fine sand: the fineness modulus of 1.5 to a 0.7, with an average particle size is 0.25mm.

The greater the fineness modulus, said Sarawak rough. Ordinary concrete sand of fineness modulus range 3.7-1.6, in the sand is appropriate, plus a small amount of fine sand or coarse sand in the ratio of 4:1.

The sand particle size distribution refers to the mix proportion of sand size particles. If it is the same thickness of the sand, the largest gap, both particle size of sand with them, the gap has been reduced, the three particle size of sand with, the gap is smaller. Thus the porosity of the sand depends on the particle size with the extent of the sand material at all levels. Level with a good sand, not only can save cement, but also improve the density and strength of concrete and mortar.

Sand Series Products of Shanghai Kefid Machinery Equipment Co., Ltd. R & D and production is in-depth study of the basis of the actual production of the domestic Sunaba designed to adapt to domestic building sand needs standards and the introduction of high performance Sand, after years of development, has formed a direct impact where the PCL sand making machine, dozens of types of sand making products highly efficient Vertical Shaft Impact Sand, 5X series of high efficiency centrifugal impact type Sand as the core, by the numerous sand field customers. Zhengzhou, Shanghai Kefid Machinery Sand has a reasonable structure, low operating costs, crushing ratio, energy saving and environmental protection, refined grain form excellent small iron pollution, low noise, less dust pollution characteristics, and the fineness modulus is adjustable produced aggregate gradation and overall fit for high-speed railway, highway, high-rise buildings, municipal engineering, water and electricity port construction, concrete mixing stations, sand and gravel aggregate standard, effective in protecting the quality of national infrastructure projects.

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