What kind of sand can the sand washing machine wash? Let me introduce to you today:
Sand is one of the main components of concrete and mortar, and it is a bulk material in civil engineering. Sand is generally divided into two categories: natural sand and artificial sand. Natural sand is formed by natural conditions, mainly rock weathering, and the particle size is below 5mm. Artificial sand, namely machine-made sand and sand washing machine, refers to the rock particles with a particle size of less than 4.75mm made by soil removal, mechanical crushing and screening, but does not include soft rock and weathered rock particles.
The specifications of sand are divided into three types: coarse, medium and fine according to the modulus of fineness (the size and type of natural sand particle size). The larger the fineness modulus, the coarser the sand.
Coarse sand: the fineness modulus is 3.7-3.1, and the average particle size is o. 5mm or more.
Medium sand: the fineness modulus is 3.0-2.3, and the average particle size is o. 5-0.35mm.
Fine sand: The fineness template is 2.2-1.6, and the average particle size is 0.35-0.25mm.
Extra-fine sand: the fineness modulus is 1.5-o. 7. The average particle size is o. 25mm or less.
The fineness modulus of ordinary concrete sand is in the range of 3.7-1.6, medium sand is suitable, or coarse sand and a small amount of fine sand are used, and the ratio is 4:1.
The particle gradation of sand refers to the matching ratio of sand particles. If it is sand of the same thickness, the voids are the largest. When two types of sand are matched, the voids are reduced. When three types of sand are combined, the voids are smaller. , it can be seen that the porosity of sand depends on the degree of matching of particle sizes at all levels of the sand. The well-matched sand can not only save cement, but also improve the compactness and strength of concrete and mortar.
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