Experimental Research on Vibrating Mixing of Concrete Based on Twin-shaft Mixer

摘要

In order to explore the effect of vibrating mixing technology in industrial production of concrete, the influence of vibrating mixing and common forced mixing on the mixing quality and efficiency were comparatively investigated by field tests of concrete mixing plant. The vibrating mixing scheme was achieved by adopting mixing shaft and blades as vibrating source based on conventional twin-shaft mixer. The field tests included mixing time test and reducing cement test. The experimental results show that under different mixing time, the freshly mixed concrete by both mixing methods have similar uniformity but the hardened concrete have distinctive compression strength; comparing with common forced mixing, vibrating mixing makes the materials in vibrating status to destroy their sticky connection and distribute cement particles, so both 7d and 28d compression strength are significantly improved and the mixing time is reduced; with the cement reduction, the compression strength of concrete by both mixing methods decrease, but comparing with common forced mixing, vibrating mixing can save cement under the condition of ensuring necessary concrete strength due to its improved cement utilization.