This article summarizes some common problems about concrete sand and gravel aggregates, hoping to help everyone in the construction.
The single particle size of desert sand does not meet the requirements of concrete use (standards and specifications). If desert sand must be used, it can be mixed with other sizes of sand to form a good particle gradation and improve the performance attributes of desert sand.
Manufactured sand is a kind of artificial sand, which can control the stone powder content and gradation requirements in accordance with the national standards and technical requirements of project quality, which can effectively meet the actual needs of different projects.
Some coastal countries and regions have begun to consider using sea sand instead of natural river sand, such as the Netherlands, France and Denmark. China, with its long coastline and vast shallow seas, is rich in sea sand resources. Therefore, some areas such as Guangdong Province have begun to accelerate the mining of sea sand, but some areas still resolutely resist sea sand, such as Shanghai. The same is the coastal area, why is the attitude towards sea sand completely different? Can sea sand be used for concrete aggregate? If so, how to use sea sand for construction?
Sand is the main component of modern building concrete and can be divided into artificial sand and natural sand. Artificial sand is divided into manufactured sand and mixed sand. Natural sand can be divided into mountain sand, river sand, desert sand and sea sand. This article will analyze the difference between manufactured sand, natural river sand, mountain sand, sea sand and desert sand.
The common manufactured sand process is divided into wet process and dry process. Since the dry process appeared later than the wet process, and the dry process was developed on the basis of the traditional wet process, there may be people I feel that the wet method may not have more advantages than the dry method in terms of process.
The complete sand production system can produce manufactured sand for high-performance concrete. It must have the following five indicators
Manufactured sand（M-sand） is also called machine-made sand, which is made by mechanical crushing and screening. Rocks, mine tailings or industrial waste slag particles with a particle size of less than 4.75 mm.
The shape characteristics of aggregate directly affect the performance of concrete. The crushing equipment is the main factor that produces these shape characteristics.
Aggregate is a granular material used in concrete and mortar. It usually comes from natural river sand and river pebbles, or from crushed natural rocks. Such as sand, crushed stone and gravel.