A Particle Packing Method for Pumpable Low Shrinkage Flowing Concrete
ACI Materials Journal, ISSN: 0889-325X, Vol: 120, Issue: 3
2023
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A Particle Packing Method for Pumpable Low-Shrinkage Flowing Concrete
Title: Author(s): Hossein Karimi and H. J. H. Brouwers Publication: Materials Journal Volume: 120 Issue: 3 Appears on pages(s): 81-92 Keywords: flowing concrete; mix
Article Description
In this paper, the applicability of the modified A&A particle packing model for designing pumpable flowing concretes, according to ACI 211.9R-18, is analyzed. An experimental investigation is undertaken to evaluate consistency, compressive strength, and shrinkage of flowing concretes designed with this model. The results show that the modified A&A model optimizes the particle size distribution of concrete ingredients and produce pumpable concretes according to ACI 211.9R-18. The distribution modulus of the model controls the combined grading, the ratio of coarse-to-fine aggregate, and the percentage of fine aggregate passing 300 µm and 150 µm. At a distribution modulus of 0.35, the model serves as the ACI’s recommended boundary limit for ideal-for-pumping combined grading. A high distribution modulus results in a high coarse-to-fine aggregate ratio and lowers the drying shrinkage of concrete. This insight enables a straightforward mix design methodology that results in concrete that meets ACI 211.9R-18 recommendations.
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