全部博文（136）
2012年（136）
分类： 系统运维
2012-02-28 18:05:07
Sand is one of the key components of concrete and sand pulp, and it is also the fundamental raw material of civil construction and engineering. It can be divided into natural sand and artificial sand. Natural one is formed in nature condition (mainly from rock weathering). Generally, we call it natural for the rock grain size is below 5mm. Artificial one is manufactured sand, which refers to the rock grain size less than 4.75mm which has been processed and screened by crusher machines. The standard one is divided into three kinds of coarse, medium and fine according the modulus of fineness.
Coarse: the modulus of fineness is 3.7-3.1, the average size is above 0.5mm
Medium: the modulus of fineness is 3.0-2.3; the average grain size is 0.5-0.35mm
Fine: the modulus of fineness is 2.2-1.6; the average grain size is below 0.25 mm.
The modulus of fineness is finer, the sand is coarser. The range of modulus of fineness for regular concrete sand is 3.7-1.6. The medium size sand is better. Or you can mix little fine sand to coarse sand, and the mixing proportion is 4:1.
The grain composition of sand refers to proportion. The space cavity of two same-sized is large, and it will be small under the condition of the proportion of two different grainsizes; it will be smaller if there are three kinds. So, the rate of space cavity depends on the proportion of different grainsize. It can save cement consumption, and increase the density and strength of concrete and sand pulp if the proportion is well.
Hongxing Machinery produces a wide range or we can also call it vertical shaft , with the advantage of low consumption, cost effective, the final product size is shaped well and low iron and dust pollution. Its fineness size can be adjusted, so the sand and gravel proportion is well, which is suitable for providing aggregate to highway, railway, civil engineering, dam construction and concrete batching plant.
This machine is a high-efficiency rock crushing equipment with home and international leading level; the machine is developed by introducing the crushing theory and technology from Barmac Company of America and combining the actual situation of sand making. It is widely used for crushing of hard and brittle materials, such as rock, grinding material, refractory material, cement clinker, quartzite, iron ore and concrete aggregate; and it is especially suitable for the sand and sandstone making for construction and road paving.
