ACI 221R 96:1996 Edition
$31.15
221R-96: Guide for Use of Normal Weight and Heavyweight Aggregates in Concrete (Reapproved 2001)
| Published By | Publication Date | Number of Pages |
| ACI | 1996 | 29 |
This guide presents information on selection and use of normal weight and heavyweight aggregates in concrete. The selection and use of aggregates in concrete should be based on technical criteria as well as economic considerations and knowledge of types of aggregates generally available in the area of construction. The properties of aggregates and their processing and handling influence the properties of both plastic and hardened concrete. The effectiveness of processing, stockpiling, and aggregate quality control procedures will have an effect on batch-to-batch and day-to-day variation in the properties of concrete. Aggregates that do not comply with the specification requirements may be suitable for use if the properties of the concrete using these aggregates are acceptable. This is discussed under the topic of marginal aggregates (Chapter 6). Materials that can be recycled or produced from waste products are potential sources of concrete aggregates; however, special evaluation may be necessary. Keywords: aggregate grading; aggregate shape and texture; air entrainment; blast-furnace slag; bleeding (concrete); coarse aggregates; concretes; crushed stone; degradation resistance; density (mass/volume); fine aggregates; mix proportioning; modulus of elasticity; pumped concrete; quality control; recycling; shrinkage; strength; tests; workability.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | CONTENTS |
| 2 | CHAPTER 1— INTRODUCTION |
| 6 | CHAPTER 2— PROPERTIES OF HARDENED CONCRETE INFLUENC… 2.1—Durability 2.1.1 Freezing and thawing |
| 7 | 2.1.2 Wetting and drying 2.1.3 Heating and cooling 2.1.4 Abrasion resistance 2.1.5 Reactive aggregates 2.1.5.1 Alkali-silica reaction |
| 8 | 2.1.5.2 Cement-aggregate reaction 2.1.5.3 Alkali-carbonate rock reaction 2.1.6 Fire-resistance |
| 9 | 2.1.7 Acid resistance 2.1.8 Other reactions 2.2—Strength |
| 10 | 2.3—Shrinkage 2.4—Thermal properties |
| 11 | 2.5—Unit weight 2.6—Modulus of elasticity 2.7—Surface frictional properties |
| 12 | 2.8—Economy CHAPTER 3— PROPERTIES OF FRESHLY MIXED CONCRETE INF… 3.1—General 3.2—Mix proportions |
| 14 | 3.3—Slump and workability |
| 15 | 3.4—Pumpability 3.5—Bleeding 3.6—Finishing characteristics of unformed concrete… 3.7—Air content |
| 16 | 3.8—Other properties CHAPTER 4— EFFECTS OF PROCESSING AND HANDLING OF AG… 4.1—General 4.2—Basic processing 4.2.1 Crushing |
| 17 | 4.2.2 Screening 4.2.3 Washing 4.2.4 Water classification 4.2.5 Rescreening 4.3—Beneficiation 4.3.1 Crushing |
| 19 | 4.3.2 Other separation devices 4.4—Control of particle shape 4.5—Handling of aggregates |
| 20 | 4.6—Environmental concerns CHAPTER 5— QUALITY ASSURANCE 5.1—General |
| 22 | 5.2—Routine visual inspection 5.2.1—Source 5.2.2—Aggregate plant 5.2.3—Aggregate handling system 5.3—Routine control testing |
| 23 | 5.4—Acceptance testing 5.5—Record keeping and reports CHAPTER 6— MARGINAL AND RECYCLED AGGREGATES 6.1—Marginal aggregates 6.2—Use of marginal aggregates |
| 24 | 6.3—Beneficiation of marginal aggregates 6.4—Economy of marginal aggregates 6.5—Recycled aggregates and aggregates from waste … CHAPTER 7— HEAVYWEIGHT AGGREGATES 7.1—Introduction |
| 25 | 7.2—Heavyweight aggregate materials 7.3—Properties and specifications for heavyweight … 7.3.1 General 7.3.2 Specific gravity 7.3.3 Grading 7.3.4 Other properties 7.3.5 Methods of sampling and testing |
| 26 | 7.4—Proportioning heavyweight concrete 7.5—Aggregates for use in radiation�shielding conc… 7.6—Heavyweight aggregate supply, storage, and bat… CHAPTER 8— REFERENCES 8.1—Recommended references |
| 27 | 8.2—Cited references |
