Concrete is an important building material, which is widely used and has always been the main building structural material. With the rapid development of social economy, building structures are becoming more and more diversified, and the application environment of concrete is becoming more and more complex and harsh, which requires higher performance of concrete. As an important component of concrete, sand and gravel aggregate has a great impact on the performance of concrete. Therefore, the development of high-performance concrete must have high-quality aggregate.
As one of the main raw materials of concrete, sand includes natural sand and machine-made sand. Due to the limitation of natural resources, the natural sand dominated by river sand is increasingly unable to meet the growing demand for concrete consumption, especially in Southwest China. In addition, due to the excessive exploitation of natural sand sources, the pressure on the natural environment is also increasing, the use of machine-made sand instead of river sand has become a trend of sustainable development in the concrete industry.
As an important component of concrete, sand aggregate has a great impact on the performance of concrete. In people's traditional understanding of sand and stone, there is a deviation. It is considered that sand and stone only play a filling role in concrete, and the quality is insignificant, as long as more cement is added. In fact, the role of sand and gravel aggregate in concrete is very important,it acts as a skeleton to transfer stress, even without cement slurry, the aggregate can support the load, restrain shrinkage and prevent cracking. Manufactured sand has been used in mortar and concrete to a certain extent.
In the case of increasing shortage of natural sand and gravel resources and increasing requirements for environmental protection, in order to meet the development requirements of concrete, artificial mechanism sand and gravel has developed rapidly. In fact, machine-made sand has incomparable advantages over natural sand and stone. In the case of shortage of natural sand and stone, the transformation of aggregate from natural aggregate to artificial aggregate is an inevitable development trend. The greater advantage of machine-made sand is the controllability and adjustability of quality. Through continuous optimization of production process, machine-made sand meeting the needs of different levels can be produced to meet the development requirements of high-performance concrete. SMMVIK Machinery thinks that the first thing is to select materials, and the quality can only be controlled if the source materials meet the standards. Secondly, the index of spherical shape of manufactured sand is good, High quality manufactured sand should be close to river sand. Later, when the mud content is controlled, the content of stone powder can be appropriately relaxed.
Considering from the whole industrial chain, the demand for concrete determines the performance of concrete and the quality of manufactured sand produced. Reasonable specifications can be designated to guide the market of machine-made sand, and win-win results can be achieved in the end, so as to achieve the sustainable development of the sand and concrete industry. SMMVIK Machinery is a large private enterprise mainly producing crushers and other mining machinery and equipment, the company has a complete set of artificial sand and stone production lines.
