E1-26: Aggregates for Concrete

Abstract:

Aggregate properties and gradation significantly affect the workability and finishability of freshly placed concrete and the properties of hardened concrete, including compressive strength, durability, and abrasion resistance. Properties and accepted test methods discussed in this bulletin include aggregate gradation; fine and coarse aggregate fineness moduli; relative bulk densities of wet, saturated surface-dry, air-dry, and oven-dry aggregates; moisture absorption; shape angularity and surface texture; abrasion and impact resistance; permeability resistance to freezing-and-thawing cycles and alkali-aggregate reactions; and chemical stability. Aggregate types including normalweight, lightweight, and heavyweight natural aggregate; blast-furnace slag aggregates; and recycled aggregates from crushed reclaimed concrete pavements and crushed returned concrete are covered. Examples are provided on how to calculate and evaluate fineness modulus, batch mixture proportions adjusted for aggregate absorption, batch mixing water proportions, water-cementitious materials ratios, and bulk densities. Sampling aggregate methods to estimate average aggregate properties of large volumes or stockpiles, batches, or truckloads of aggregates are also covered.

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