Results indicate that proper quantities of ultra-fine limestone flour can help engineers to decrease the time-loss of concrete slumpconstant and to increase concrete strength.
适当的掺量可减少混凝土坍落度的经时损失，提高混凝土强度。
2
This paper focuses on mixing cement concrete batching at how to improve the preparation of precision pneumatic valves, and how to accurately control the concrete slumpconstant.