Aggregate properties and gradation significantly affect workability and finishability of freshly placed concrete and 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 freeze thaw cycles and alkali-silica reaction; and chemical stability. Aggregate types including normalweight, lightweight and heavyweight natural aggregate; blast furnace slag aggregates; and recycled aggregates from crushed reclaimed concrete pavements 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 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.
Keywords: abrasion resistance, absorption, aggregate angularity, aggregate gradation, aggregate surface texture, air-dry bulk density, alkali-silica reaction, batch mixture proportioning, blast-furnace slag aggregate, bulk density, compaction, fineness modulus, heavyweight aggregate, lightweight aggregate, mixing water, normalweight aggregate, oven-dry bulk density, recycled aggregate, relative bulk density, saturated surface-dry bulk density, sampling, surface moisture, water-cementitious ratio.
Table of Contents
CHAPTER 2—CLASSIFICATION OF AGGREGATES
CHAPTER 3—AGGREGATE PROPERTIES AND TEST METHODS
3.2—Relative density (specific gravity)
3.3—Absorption and surface moisture
3.5—Particle shape and surface texture
3.6—Abrasion and impact resistance
CHAPTER 4—SAMPLING AGGREGATES
4.1—Variability in aggregates
CHAPTER 5—BLAST-FURNACE SLAG AND LIGHTWEIGHT AGGREGATES
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