As a senior manufacturer of
sand making machine, SBM introduces the content requirements of machine-made sand and artificial sand-heavy stone powder for you. In the process of producing sand, inevitably, a part of stone powder is produced, and the content of stone powder in the original sand is generally as high as 10%-20%. This article has studied the content of different stone powder (5%, 7%, 10%, 15%, 20%). , 25%) Effect on the working performance, compressive strength, impermeability of water pressure, diffusion coefficient of chloride ion of C30 pumped concrete. The test results show that when formulating C30 pumping system for sand concrete, the content of stone powder in the machined sand can be determined. From the national standard limit of 7% to 10%-15%.
National standards stipulate that when the mb value is less than 1.4, the stone powder can be less than 10%! Because the stone powder has influence on the strength and workability of the concrete, each enterprise can control according to its own situation, and some 15% can also be used.
Then, the
sand making machine needs to be used for the production and processing of different types of rock powder. The whole set of sand production line equipment includes: jaw crusher, VSI sand making machine, sand washing machine, vibrating screen, conveyor and other equipment. The effect of the content of stone powder on the performance of the strength grade C45 machine-sand concrete was investigated by using rock to crush the unprocessed undisturbed machine-made sand, and a limit value range of the mechanism's practical application value for the sand content of the sand was proposed. It is of great significance to promote the development of concrete technology.
In the mixed sand concrete grouting material, the surface area of the stone powder and the extra fine sand is relatively large and the water absorption rate is high, which often causes the water ash to be relatively large. Therefore, suitable admixtures should be added to reduce the water-cement ratio and improve the working performance of the concrete grouting material. Engineering Quality. Where conditions permit, other admixtures (such as fly ash, slag powder, silica fume, etc.) can also be added to improve the performance of the mixed sand. Therefore, the problem of stone powder content in the machined sand must be taken seriously. The maximum content of stone powder in the mechanized sand should be determined experimentally and should generally be controlled within 15%.