A New Mix Design Method for Self-Compacting Concrete Based on Close Aggregate Packing Method

International Journal of Civil Engineering

© 2019 by SSRG - IJCE Journal

Volume 6 Issue 4

Year of Publication : 2019

Authors : Tigiri Neeka, Barisua E. Ngekpe, Godfrey W. T. Jaja

10.14445/23488352/IJCE-V6I4P106

How to Cite?

Tigiri Neeka, Barisua E. Ngekpe, Godfrey W. T. Jaja, "A New Mix Design Method for Self-Compacting Concrete Based on Close Aggregate Packing Method," SSRG International Journal of Civil Engineering, vol. 6,  no. 4, pp. 23-33, 2019. Crossref, https://doi.org/10.14445/23488352/IJCE-V6I4P106

Abstract:

The close aggregate packing method is a new type of mix design used to design for self – compacting concrete. To improve the particle packing density of concrete, the particles should be selected to fill up the voids between large particles with smaller particles and obtain a dense and stiff particle structure. A higher degree of particle packing leads to minimum voids, maximum density, and cement and water requirement will be less. The optimum bulk density was obtained at a proportion of 42% coarse aggregates (20mm downsize), 18% coarse aggregates (12.5mm downsize), and 40% fine aggregates. The peak value of the compressive strength of cubes is 81 MPa, while that of the cylinders' split tensile strength is 2.82 MPa. The mix ratio of 1:0.80:1.20:0.25:0.013 (cement: fine aggregate: coarse aggregate: water ratio: supper plasticizer dosage) should be used for the consistent production of a Grade 80 MPa self-compacting concrete as it will meet the European Standard for Self-Compacting Concrete acceptability criteria for a self-compacting concrete and also give 28 days compressive strength of 81 MPa.

Keywords:

Concrete, Self-compacting Concrete, Bulk density, voids ratio, packing density, mix design, plotting.

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