环境因素，如高环境温度、低湿度、大风或低湿度和大风，会影响混凝土性能以及混凝土材料的搅拌、运输和浇筑的施工操作。本指南提供了可采取的措施，以将这些环境因素的不良影响降至最低，并减少出现严重问题的可能性。本指南定义了炎热天气，讨论了潜在问题，并介绍了旨在将其最小化的实践。这些实践包括选择材料和比例、预冷配料和配料。讨论的其他主题包括运输长度、浇筑时混凝土温度的考虑、现场处理混凝土的设施，以及早期养护期间的浇筑和养护技术，以及炎热天气条件下的适当测试和检查程序。 本文件中描述的材料、工艺、质量控制措施和检查应仅由持有相应ACI证书或同等证书的个人进行测试、监控或执行（如适用）。

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.