The machine-made sand market has a bright future, and it can

10.30.2021

    With the increasing scale of construction works, the demand for natural river sand has also increased correspondingly, and the gradual exhaustion of natural river sand resources has severely restricted the development of concrete companies. The use of machine-made sand has become a new raw material for concrete companies and other companies.

    One: What is machine-made sand

    Machine-made sand refers to sand that is processed by a sand making machine and other auxiliary equipment. The finished product is more regular and can be processed into sand of different rules and sizes according to different technological requirements, which can better meet daily needs. Machine-made sand requires professional equipment to produce qualified and applicable sand and gravel.

    Requirements for machine-made sand production

    1. Robustness and durability test. The firmness of machine-made sand is slightly worse than that of river sand, but it still meets the standard excellent product index, and there is no problem in using it in ordinary concrete. However, when used in concrete components that are often subjected to frictional impact, in addition to admixtures, the ratio of lime to sand and the crushing index of sand and the content of stone powder should be controlled.

    2. The influence of machine-made sand and gravel powder content on the performance of cement mixture. Through cement test, mortar test, and concrete test, there is no big difference between using machine-made sand to prepare concrete and natural sand. Generally speaking, under the premise of the same slump, the water consumption of machine-made sand should be slightly larger, but it should be considered according to construction conditions, structures and transportation factors. However, the strength of concrete remains basically unchanged; when using machine-made sand to prepare special concrete such as pumped concrete, the sand rate should not be too high to prevent the reduction of concrete strength and durability.

    Advantages of machine-made sand

    Factory production, quality can be guaranteed

    Factory production can establish a quality monitoring system from a series of technological processes such as material selection and crushing. Only when the production conditions are good can the quality of the sand be guaranteed.

    2. Good physical and mechanical properties of sand

    It is possible to consciously choose hard rock to produce machine-made sand, avoid soft and weathered rocks, and at the same time, the amount of mud (lumps) can be controlled by manual screening. The chemical composition is the same as the base material and crushed stone, which has no negative effect on the concrete and is suitable for high-strength concrete.

    3. The particle gradation and fineness modulus of machine-made sand can be adjusted

    The fineness modulus and particle gradation of machine-made sand can be adjusted according to the needs of the project, combined with the characteristics of the base material and the requirements of concrete. The adjustment measures are mainly completed through the selection of crushing equipment and process flow.

    In the process of project construction, sand and gravel are an important part of concrete structural materials, and its quality has a decisive influence on the quality and durability of the entire project. Under the premise of satisfying the sand performance index, choose an economical and feasible plan that not only meets the construction quality requirements, but also effectively controls the production cost. In this way, in areas lacking natural sand resources, use high-efficiency fine vertical impact crushers or impact crushers It is not only feasible to machine high-quality machine-made sand for concrete construction production, but its comprehensive benefits are also significant. At the same time, in the use of machine-made sand, it is also possible to conduct research experiments and accumulate experience in the subject of building materials to lay the foundation for the development of the subject.