Guide to Hot Weather Concreting: Chapter 5 Production and Delivery; Chapter 6 Placing and Curing-Chapter 5 and 6 of ACI 305R-10, Guide to Hot Weather Concreting (PDF)

Chapter 5 and 6 of ACI 305R-10, Guide to Hot Weather Concreting (PDF)

Pdf Summary

The document "ACI 305R-10 Guide to Hot Weather Concreting" by the American Concrete Institute provides comprehensive guidelines for concrete construction under hot weather conditions. Released in October 2010, it updates the previous version from 1999, focusing on solving challenges presented by environmental factors such as high temperatures, low humidity, and high wind speeds. These conditions can adversely affect concrete's properties and construction operations.<br /><br />The guide outlines various measures to mitigate the negative impacts of hot weather on concrete. It emphasizes selecting appropriate materials and proportions, precooling ingredients, and adjusting batching processes. Moreover, it addresses issues like managing the length of haul, handling concrete at the site, and ensuring effective placing and curing during the early period. The document also stresses the importance of suitable testing and inspection procedures to maintain concrete quality.<br /><br />The guide is structured into several chapters, covering potential hot weather-related problems and effective practices, the effects of environment on concrete properties, and detailed procedures for production, delivery, placement, and curing of concrete. It also includes testing and inspection recommendations for maintaining concrete quality under hot weather conditions.<br /><br />Special attention is given to reducing concrete temperature through various methods, such as cooling aggregates and water, using ice or liquid nitrogen, and painting mixer drums to minimize heat absorption. Guidelines for maintaining slump and uniformity in concrete, and strategies to prevent accelerated setting and ensure proper curing, are also provided.<br /><br />Finally, the document recommends adopting trial batches and utilizing admixtures for extended slump retention and consistent quality control during high-temperature operations. This guide is a critical resource for engineers and practitioners, aiding in the planning and execution of concrete projects in hot weather, thus ensuring structural integrity and long-term durability.

Keywords

hot weather concreting

ACI 305R-10

concrete construction

high temperatures

concrete properties

curing methods

material selection

batching processes

quality control

environmental challenges