Sand is an essential component of dry mortar, so what kind of sand is best to make dry mortar?

What size of sand is best for dry mix mortar?

Generally speaking, sand needs to be screened until we get the size we want, so what are the dimensions of sand in general?

  • Extra-fine sand: particle size less than 0.25mm.
  • Fine sand: particle size is 0.25~0.35mm.
  • Medium sand: the particle size is 0.35~0.5mm.
  • Coarse sand: particle size greater than 0.5mm.

3 points to help you choose a good sand

Ordinary dry powder mortar has requirements on consistency, density, water retention, setting time, compressive strength, bond strength, shrinkage, etc. Due to artificial plastering or mechanized spraying on machine-made sand, construction and workability need to be considered. There are some requirements for roundness, powder content, fineness modulus and grade of machine-made sand.

1. Roundness requirements

Good machine-made sand can produce good dry-mix mortar because river sand has a smooth surface and rounded grain shape, so only a small amount of cement is required during the curing process. River sand is the aggregate for producing dry-mix mortar.

2. The fineness of the sand

Sand is conducive to improving the strength and fluidity of dry mortar while reducing the number of cementitious materials, improving the quality of the cannon and reducing the production cost. Generally speaking, the fineness of sand can be controlled between 2.3-2.8mm.

3. Powder content requirements

By applying dry mortar in daily life, when MB≤1.4, the stone powder content in plastering mortar generally needs to be controlled within 10%, and the stone powder content in masonry mortar can be appropriately increased.

In the dry mortar production line, the choice of sand determines the dry mortar quality. When you buy sand or screen sand, you need to consider the particle shape, fineness and powder content of the sand.

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