Preparation method of high performance concrete machine-made sand

Abstract

The invention relates to a preparation method of high performance concrete machine-made sand. The preparation method comprises the following steps: S1, storing incoming main raw material macadam or aggregate chips in a stacking shed to be naturally aired, and feeding the main raw material which is naturally aired to a discharging terrace funnel; S2, raising the temperature and reducing the temperature gradually to prepare lightweight aggregates (a fine aggregate I, a coarse aggregate I and a coarse aggregate II), then processing the lightweight aggregates, ground stones and an abrasive material to obtain machine-made sand; S3, adding winnowing equipment at the tail end of a gravel production line, winnowing fine particles which are crushed and separated only, then selecting powder througha powder selecting machine and collecting and storing fine gravel powder; and S4, acquiring flowability, feeding the powder through a discharging valve, lifting the powder to a sand-making tower through a belt conveyor and a belt-bucket elevator, processing the gravels or aggregate chips through a sand-making shaping machine, an air jet sieve and a moisture mixing machine from top to bottom, and discharging the mixture to obtain finished product machine-made sand. High performance concrete and high strength concrete are prepared favorably, and a lot of water sources are not consumed.

Description

technical field [0001] The invention relates to a preparation method of high-performance concrete machine-made sand, in particular to a preparation method of high-performance concrete machine-made sand, and belongs to the technical field of machine-made sand preparation. Background technique [0002] During the use of existing concrete or machine-made sand concrete, shrinkage and creep will generally occur, that is, during the evaporation of water in the concrete or the absorption of stones, there will be alternating deformation of shrinkage and expansion, resulting in cracking of the structure and affecting the stress of the structure integrity, reducing its strength. [0003] At present, some manufacturers adopt the method of wind separation to select powder, and add a feeder to the front end of the air separation device to spread the materials. Since wind separation is added to the front end of the vibrating screen, the amount of material to be processed is relatively la...

AI Technical Summary

Problems solved by technology

Since wind separation is added to the front end of the vibrating screen, the amount of material to be processed is relatively large (generally, the sand forming rate is 30%-50%), and in order to improve the winnowing effect, the air volume of the blower is required to be large, which leads to the air volume of the induced draft fan of the dust collector. It should also be enlarged and the dust removal area increased, which greatly increases energy consumption and investment

[0004] The problems of complex production process of machine-made sand, high energy consumption, serious pollution, and unreasonable particle gradation of machine-made sand are becoming more and more prominent.

Seriously restrict the sustainable development of building materials industry