Fine aggregates for construction mortar include natural sand and artificial sand. Natural sand refers to rock particles formed by natural conditions and with a nominal particle size less than 5.00mm. According to different sources, it is divided into river sand, sea sand and mountain sand. Artificial sand refers to rock particles with a nominal particle size less than 5.00mm that are obtained by removing soil, mining, mechanical crushing, and screening.
Because river sand has been washed by running water for a long time, the particles become round. River sand is mostly used in general projects. Sea sand has been washed by sea water for a long time, and its particles are round and clean. However, it is often mixed with shells and their fragments and has a high chlorine salt content. Generally, it is not used. Mountain sand is found in valleys or old river beds. The particles have many edges and corners, the surface is rough, and the content of stone powder is high.
Artificial sand is made by crushing natural stone, so the surface is rough and not smooth, with many edges and corners and a large powder content. </p
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