n Ergonomics SA : Journal of the Ergonomics Society of South Africa - A case study of the effect of a low-cost design concrete mixer on reducing human effort : research article




A manually operated concrete mixing device (Roll-a-mix) was developed to address the production problems inherent in mixing concrete by hand. The method to determine the mixing time of concrete by measuring the rate of change in the uniformity of the mixed concrete was used to compare the productivity of the Roll-a-mix to the hand mixing of concrete It is reported that 31.4 % less human energy was spent operating Roll-a-mix, than producing similar acceptable quality concrete by conventional hand mixing. Suggestions are given for further research.


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