In the production and application of concrete, manufactured sand and stone powder, as important admixtures, have a significant impact on concrete performance. In particular, manufactured sand and stone powder of different lithologies exhibit diverse effects on concrete. This paper will explore the impact of manufactured sand and stone powder on concrete performance from aspects such as lithology, dust adsorption, and the interaction between stone powder and water-reducing agents, and propose corresponding countermeasures.

Manufactured Sand Equipment Information

I. Influence of Lithology on Concrete Performance

Manufactured sand and stone powder of different lithologies differ in water absorption rate and chemical properties, which directly affects the workability and strength of concrete. For example, calcareous stone powder has a much lower water absorption rate than siliceous stone powder, while limestone powder has a certain activity and can participate in the hydration reaction of cement, improving concrete performance. Therefore, in the concrete production process, the amount and proportion of manufactured sand and stone powder should be adjusted reasonably according to the characteristics of different lithologies.

II. Influence of Dust Adsorption on Water-Reducing Agents

In concrete, there are differences in the adsorption of water-reducing agents by mixed materials such as cement, fly ash, and slag. Generally, the finer the material, the greater the adsorption. This requires us to fully consider the compatibility of the water-reducing agent with the concrete raw materials when selecting it, to avoid poor performance of the water-reducing agent due to adsorption.

III. Interaction between Stone Powder and Water-Reducing Agents

Stone powder has a dual role in concrete. On the one hand, an appropriate amount of stone powder can improve the cohesion and water retention of concrete, which is beneficial to improving the workability of concrete; on the other hand, excessively high stone powder content will increase the adsorption of free water, leading to a decrease in concrete workability. Therefore, in the concrete production process, 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 workability requirements of the concrete.

IV. Countermeasures

Optimize raw material selection: When selecting manufactured sand and stone powder, factors such as lithology, water absorption rate, and chemical properties should be fully considered to select high-quality raw materials that meet the concrete performance requirements.

Reasonable adjustment of mix proportion: According to the strength grade and workability requirements of the concrete, reasonably adjust the amount and proportion of manufactured sand and stone powder to ensure that the concrete performance reaches the optimal state. Strengthen quality control: During the production process, quality control of raw materials, water-reducing agents, etc., should be strengthened to prevent the deterioration of concrete performance due to raw material quality problems.

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

In summary, the influence of manufactured sand and stone powder from different rock types on concrete performance is complex and diverse. In actual production, we should fully consider the influence of various factors and adopt reasonable countermeasures to ensure that the concrete performance reaches its optimal state.