Specific Surface of Aggregates Applied to Mix Proportioning


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Title: Specific Surface of Aggregates Applied to Mix Proportioning

Author(s): B. G. Singh

Publication: Journal Proceedings

Volume: 55

Issue: 2

Appears on pages(s): 893-901

Keywords: no keywords

Date: 2/1/1959

Suggested Proportioning Method, applicable to both continuous and gap-graded aggregates, uses specific surface of aggregate as an index of grading. Two charts are offered for use with this method. After selecting the W/C ratio to give a required strength, the first chart is used to choose an aggregate-cement ratio that will give desired consistency at the selected W/C. Froin the second chart a specific surface corresponding to the aggregate-cement ratio is chosen to allow for slightly higher or lower sand content . The Fine and coarse aggregate are combined (as illustrated) to give the required specific surface. Charts are for irregular, 3/4 in. maximum size aggregate, but charts for proportioning with other types and sizes of aggregate may be similarly developed.