REVIEW OF AGGREGATE BLENDING TECHNIQUES - Optimization of Aggregate Gradation and its effects on ...
an aggregate mix sampled from belt or stockpile may fully meet ...Importance of aggregate gradation for concrete slab. For a good concrete mix typical gap-graded aggregates consist of only one size of coarse aggregate with all the particles of fine aggregate able to pass …are on a gross area basis. The effect of grading of aggregate is shown in the bottom set of curves. From the curves it would appear that an optimum fineness modulus existed for each aggregate type and that there was a sharp decline in compressive strength when theAggregate gradation curves: (a) maximum density gradations for 37.5 and 4.75 mm sizes based on the Fuller relationship; (b) a uniform aggregate; (c) a gap-graded aggregate; (d) screenings.The aggregate mix is poured on the top most sieve and the stack is given a shake. The weights retained on each sieve are then recorded and the gradation curve can be plotted on a semi-logarithmic scale. The following table shows some sieve designations commonly used along with the opening sizes (opening per linear inch).The grading and grading limits are usually expressed as the percentage of material passing each sieve. Fig. 5-6 shows these limits for fine aggregate and for one size of coarse aggregate. There are several reasons for specifying grading limits and nominal maximum aggregate size; they affect relative. 82. Design and Control of Concrete Mixtures ...Four curves are shown for each maximum size of aggregate,
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