Artificial sand requirements for size, grain type, and raw materials

Date: Nov. 17, 2021

The particle size of machine-made sand is between 4.75 and 0.15mm, and there is a certain proportion of stone powder less than 0.075mm. Its size is divided into: 4.75, 2.36, 1.18, 0.60, 0.30, 0.15. The grain size is better to be continuous, and each grain size should have a certain proportion, and the grain shape should be cubic as much as possible, and there are certain restrictions on the content of needle flakes.

Granular gradation of machine-made sand

The particle gradation of sand refers to the proportion of sand-sized particles. If it is sand of the same thickness, the gaps between them are larger; the gaps between the sands of two particle sizes are reduced to some extent; the gaps are smaller when the sands of three particle sizes are matched. It can be seen that the porosity of sand depends on the degree of collocation of various particle sizes of sand. A well-graded sand can not only save cement, but also improve the density and strength of concrete and mortar.

Raw material for machine-made sand

The raw materials of machine-made sand are usually granite, basalt, river pebbles, cobblestone, andesite, rhyolite, diabase, diorite, sandstone, limestone and other varieties. The machine-made sand made of it is classified according to the type of rock, and there are differences in strength and use.

Grain type requirements of machine-made sand

Mine configuration requires fine particles of crushed materials. Generally speaking, needle-shaped materials enter the mill and are easier to be ground. The requirement of building gravel is just the opposite, and there is a strict ratio limit on the needle-flaky shape. The main reason is that the cubic particles have edges and corners, which can play a role in locking the particles to each other. At the same time, cubic particles have stronger adhesion than needle-shaped particles and round particles, and occupy a larger surface area.