ACI 305R 2020
$51.46
ACI 305R-20: Guide to Hot Weather Concreting
| Published By | Publication Date | Number of Pages |
| ACI | 2020 |
Environmental factors, such as high ambient temperature, low humidity, high wind, or both low humidity and high wind, affect concrete properties and the construction operations of mixing, transporting, and placing of the concrete materials. This guide provides measures that can be taken to minimize the undesirable effects of these environmental factors and reduce the potential for serious problems. This guide defines hot weather, discusses potential problems, and presents practices intended to minimize them. These practices include selecting materials and proportions, precooling ingredients, and batching. Other topics discussed include length of haul, consideration of concrete temperature as placed, facilities for handling concrete at the site, and, during the early curing period, placing and curing techniques, and appropriate testing and inspection procedures in hot weather conditions. The materials, processes, quality control measures, and inspections described in this document should be tested, monitored, or performed as applicable only by individuals holding the appropriate ACI certifications or equivalent. Keywords: air entrainment; cooling; curing; evaporation; high temperature; hot weather construction; plastic shrinkage; production methods; retempering; slump tests; water content.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 3 | TITLE PAGE |
| 4 | CHAPTER 1—INTRODUCTION AND SCOPE 1.1—Introduction 1.2—Scope CHAPTER 2—NOTATION AND DEFINITIONS 2.1—Notation |
| 5 | 2.2—Definitions CHAPTER 3—POTENTIAL PROBLEMS AND PRACTICES 3.1—Potential problems in hot weather 3.2—Potential problems related to other factors 3.3—Practices for hot weather concreting |
| 6 | CHAPTER 4—EFFECTS OF HOT WEATHER ON CONCRETE PROPERTIES 4.1—General |
| 9 | 4.2—Calculating estimated evaporation rate |
| 11 | 4.3—Effects of temperature of concrete 4.4—Maximum ambient and concrete temperature |
| 12 | 4.5—Water |
| 13 | 4.6—Cement |
| 14 | 4.7—Supplementary cementitious materials 4.8—Chemical admixtures |
| 16 | 4.9—Aggregates 4.10—Fibers |
| 17 | 4.11—Proportioning |
| 18 | CHAPTER 5—PRODUCTION AND DELIVERY 5.1—General 5.2—Temperature control of concrete |
| 19 | 5.3—Batching and mixing |
| 20 | 5.4—Delivery 5.5—Slump adjustment 5.6—Properties of concrete mixtures 5.7—Retempering CHAPTER 6—PLACING AND CURING 6.1—General 6.2—Preparations for placing and curing |
| 21 | 6.3—Placement and finishing |
| 22 | 6.4—Curing and protection |
| 23 | CHAPTER 7—TESTING AND INSPECTION 7.1—Testing 7.2—Inspection |
| 24 | CHAPTER 8—REFERENCES 8.1—Referenced standards and reports |
| 25 | 8.2—Cited references |
| 27 | APPENDIX A—ESTIMATING CONCRETE TEMPERATURE A.1—Estimating temperature of freshly mixed concrete A.2—Estimating temperature of concrete with ice APPENDIX B—METHODS FOR COOLING FRESH CONCRETE B.1—Cooling with chilled mixing water B.2—Liquid nitrogen cooling of mixing water B.3—Cooling concrete with ice |
| 28 | B.4—Cooling mixed concrete with liquid nitrogen B.5—Cooling of coarse aggregates |
