Effect of Vibrating Mixing on Air Content and Compressive Strength of Concrete
This paper made a study on the effect of different vibrating parameters on the air content and compressive strength of concrete by the test of using the combining method of vibrating and forced mixing, and compared it with common forced mixing and mixing with air entraining agent. It indicated that the blade of the mixer, also as the vibrating source of vibrating mixing, had a significant effect on the air content of fresh concrete and compressive strength of hardened concrete; the air content of the fresh concrete could be up to 3.0%~3.5% when the vibrating strength was 4~8, and meanwhile the compressive strength of the hardened concrete was higher; different with improving the air content by adding air entraining agent, the vibrating mixing could increase the air content in the concrete by more retained air from bubbles refined in the mixing process and make the diameters of pores inside in the decreasing direction. In this case, it could not only improve the air entraining effect to achieve the high value of air content required by the construction, but it also could increase the compressive strength of the concrete comparing with the forced mixing with air entraining agent.
Hui Li, Yan Feng Liu, Ming Guo, Rui Zhang and Jing Du
L. J. Zhao and Z. X. Feng, "Effect of Vibrating Mixing on Air Content and Compressive Strength of Concrete", Advanced Materials Research, Vols. 374-377, pp. 1863-1867, 2012