The influence of different rock-type machine-made sand and gravel powder on concrete performance and countermeasures

As a concrete admixture, the quality and content of machine-made sand and gravel powder have an important influence on the performance of concrete. Machine-made sand and gravel powder of different rock types have differences in water absorption rate, chemical properties, etc., which affect the working performance and strength of concrete. The adsorption of dust on water reducer also affects the performance of concrete. The selection of raw materials should be optimized, the proportion should be adjusted reasonably, quality control should be strengthened, and advanced technology should be adopted to ensure the best performance of concrete.

In the production and application of concrete, machine-made sand and gravel powder is an important admixture, and its quality and content have an important influence on the performance of concrete. In particular, the influence of machine-made sand and gravel powder of different rock types on concrete is diverse. This article will explore its influence on concrete performance from the aspects of rock type, dust adsorption, stone powder and water reducer, and propose corresponding countermeasures.

Machine-made sand equipment information

1. The influence of rock type on concrete performance

Machine-made sand and gravel powder of different rock types have differences in water absorption rate, chemical properties, etc., which directly affect the working performance and strength of concrete. For example, the water absorption rate of calcium stone powder is much lower than that of silica stone powder, while limestone powder has certain activity and can participate in the hydration reaction of cement to improve the performance of concrete. Therefore, in the process of concrete production, the amount and proportion of machine-made sand and stone powder should be reasonably adjusted according to the characteristics of different rock properties.

2. The effect of dust on the adsorption of water reducer

In concrete, there are differences in the adsorption of cement, fly ash, slag and other mixed materials on water reducer. Generally speaking, the smaller the fineness of the material, the greater its adsorption capacity. This requires us to fully consider its compatibility with concrete raw materials when selecting water reducer to avoid poor water reducer effect due to adsorption.

3. The relationship between stone powder and water reducer

The role of stone powder in concrete is dual. On the one hand, an appropriate amount of stone powder can improve the cohesion and water retention of concrete, which is conducive to the improvement of concrete working performance; on the other hand, too high a stone powder content will increase the adsorption of free water, resulting in a decrease in concrete working performance. Therefore, in the process of concrete production, the content of stone powder should be strictly controlled, and the amount of stone powder added should be reasonably adjusted according to the strength grade and working performance requirements of concrete.

IV. Countermeasures

Optimize the selection of raw materials: When selecting machine-made sand and stone powder, its lithology, water absorption rate, chemical properties and other factors should be fully considered to select high-quality raw materials that meet the performance requirements of concrete.

Reasonable adjustment of the proportion: According to the strength grade and working performance requirements of concrete, the amount and proportion of machine-made sand and stone powder should be reasonably adjusted to ensure that the performance of concrete reaches the best state.

Strengthen quality control: In the production process, the quality control of raw materials, water reducers, etc. should be strengthened to avoid the degradation of concrete performance due to raw material quality problems.

Adopt advanced technology: By adopting advanced production technology and management methods, the production efficiency and performance stability of concrete can be improved.

In summary, the influence of machine-made sand and stone powder of different lithologies on the performance of concrete is complex and diverse. In actual production, we should fully consider the influence of various factors and adopt reasonable countermeasures to ensure that the performance of concrete reaches the best state.