In the construction of construction projects, the quality problems of concrete are mainly caused by the quality deviation of the materials, such as the strength, stability and setting time of the cement used, as well as the density, mud content, particle size and organic content of the sand and gravel aggregates. Once these factors do not meet the engineering use standards, it will cause the concrete to appear brittle and even crush the consequences.

Gravel aggregate gradation is very important for the impact of concrete. Sand and gravel aggregates play a role in concrete just like human skeletons. Therefore, increasing strength and maintaining shape are its main uses. Among them, coarse sandstone aggregate is a relatively large consumable material. After the concrete is hardened, it plays a key role in promoting the shape of the artificial stone and forms a strong support for it. The more common stone materials include igneous rocks, granite, gneiss, metamorphic rocks, pyroxene, quartzite, etc., as well as sandstone and limestone in sedimentary rocks. The role of fine sand and gravel aggregate is related to its characteristics. It is mainly used as a filler between coarse sand and gravel aggregates. With the flow of cement, it gradually mixes into sand and mud and fills in the middle of each gap, which can improve the alkali material. As a function of workability, fine sand and gravel aggregates include different types of sea sand, river sand and mountain sand according to their formation reasons.

This is the end of the above introduction about sand and gravel aggregates, I hope it will be helpful to you.