Effect of Mixing Time of Pre-Mixed Cement and Post-Mixed Cement on the Strength Development of the Concrete

프리믹스 및 포스트믹스 시멘트를 혼입시간이 콘크리트의 압축강도에 미치는 영향

This study proposed the optimal mixing time for pre-mixed cement and post mixed cement using the statistical analysis method of box plots. Pre-mixed cement can prevent material seegregation, strength loss, and quality variation if mixed for at least 60 seconds, and the data median is shown to be within the box range. Post-mixed cement should be mixed for at least 180 seconds to prevent material segregation, strength loss, and quality variation, and compressive strength tends to increase with longer vibrating times. Therefore, it is suggested that using pre-mixed cement can shorten the vibrating time and increase the productivity of the concrete.