The American Concrete Institute (ACI) has released a paper exploring how the ‘pre-mix’ method was used to mix cement and fly ash in an energy-saving gravity (ESG) mixer.
The report, Mixing Performance of Energy-Saving Gravity Mixer for Powder Materials, says pre-mixed powder was flattened circular and six samples were taken from symmetric perimeter and then mixed with water in a mortar mixer. Specimens of each sample were made for compressive strength tests
“The variation coefficient of compressive strengths in a 1-day test (steam curing) was 3.9% with a comparison of 4.7% in a mortar mixer, and a 3-day test (air curing) was 2.11% with comparison of 8.9% in a mortar mixer,” the report adds.
According to ACI, the mixing performance of the ESG mixer was verified that only its six units are sufficient to mix two different powders uniformly due to the mechanism of interparticle collisions and impact with further enhancement of splitting and recombination actions. This system was used in marine construction site for real application.
This paper was written by Tek Raj Gyawali, Buddhi Raj Joshi and Matabee K. Maeda.