ACI 305R-20 (IN-LB, SI) PDF Download

ACI 305R-20 (IN-LB, SI) is a standard. It is a comprehensive guide that addresses the challenges and considerations associated with concreting in hot weather conditions. Hot weather conditions can negatively impact the properties of concrete and the construction operations involved in mixing, transporting, and placing concrete materials. This guide provides measures to minimize the undesirable effects of environmental factors such as high ambient temperature, low humidity, high wind, or a combination of low humidity and high wind.

The standard defines hot weather and discusses potential problems that can arise in these conditions. It then presents practices that can be implemented to mitigate these problems. These practices include selecting appropriate materials and proportions, precooling ingredients, and proper batching techniques. The guide also covers other important aspects such as the length of haul, consideration of concrete temperature during placement, handling concrete at the construction site, and appropriate placing and curing techniques during the early curing period. It also emphasizes the importance of testing, inspection, and quality control measures to ensure the integrity of the concrete in hot weather conditions.

The implementation of the materials, processes, inspections, and quality control measures described in this guide should be carried out by individuals who hold the appropriate ACI certifications or equivalent qualifications. This ensures that the necessary expertise is applied to minimize the risks associated with hot weather concreting and to achieve the desired concrete properties and performance.