Effect of machine-made sand grading on concrete performance

The performance of concrete is affected by many factors, among which the gradation of machine-made sand is one of the important factors affecting the quality and performance of concrete. According to relevant experimental results, reasonable gradation can improve the workability, strength and durability of concrete, while poor gradation may lead to a decrease in concrete performance and worsen the workability of concrete mixture. Therefore, understanding the influence of machine-made sand gradation on concrete performance is of great significance for optimizing concrete mix ratio and improving engineering quality.

The influence of machine-made sand gradation on concrete performance

Workability

Reasonable gradation can improve the fluidity of concrete, thereby increasing the coverage and filling of sand, making the concrete more uniform and dense, thereby improving its workability, while improper gradation may lead to insufficient sand coverage or excessive void ratio, resulting in a decrease in concrete workability.

Strength

Reasonable gradation and appropriate amount of stone powder can increase the volume of cement slurry, improve the density and uniformity of concrete, thereby improving its strength, while improper gradation and excessive stone powder content may lead to concrete segregation and bleeding, uneven internal structure, shrinkage microcracks and other defects, reducing its strength.

Durability

Reasonable grading can improve the impermeability and frost resistance of concrete, thereby improving its durability, while improper grading may lead to uneven distribution of aggregates in concrete, forming seepage channels, reducing the impermeability of concrete and reducing its durability. In addition, when using machine-made sand to prepare concrete in special cold areas, air entraining agent can be appropriately added to improve the frost resistance of concrete. The specific amount should be determined by test mixing.

In addition, the particle shape of machine-made sand will also affect the bulk density of machine-made sand, thereby affecting the compactness of concrete. Generally speaking, the more machine-made sand with spherical or nearly spherical particles, the greater the bulk density, which is conducive to improving the fluidity of concrete and improving the workability and mechanical properties of concrete. The surface of machine-made sand is rough and angular. When configuring concrete, although it can facilitate the bonding between aggregate and cement, due to the large angular lines and roughness of the aggregate, its porosity is also large, so more slurry materials are needed to wrap it. Therefore, more water and gel materials are needed to achieve the same workability, otherwise it may cause concrete segregation and exudation, affecting the fluidity and strength of concrete, and may also cause the slump of concrete to decrease.

Good machine-made sand equipment can not only improve the production efficiency of machine-made sand, but also effectively improve the quality and performance of machine-made sand through precise particle size control and optimized grading design. Therefore, the importance of choosing good machine-made sand equipment to improve the grading of machine-made sand is self-evident.

Xin Gaonai Heavy Industry specializes in the research and development and manufacturing of complete sets of crushing, screening, feeding and conveying equipment in the field of soft rock. All equipment from casting-machining-assembly is controlled by technical engineers at all levels, and strives for excellence. It can provide customers with a full set of high-quality machine-made sand production line equipment, which can not only help users effectively improve the production efficiency of machine-made sand, but also have excellent particle shape and reasonable grading, which can provide reliable quality building materials for construction and road projects.

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