ACI 305R-10 PDF

More info 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.

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Send email Mail Extreme weather conditions extreme heat or cold, and humidity variations can significantly alter the quality of concrete. In hot weather concreting, one should make sure that all the negative impacts of high ambient temperature are appropriately alleviated by taking the necessary precautions.

In this article, we will review how hot weather temperatures can affect the quality of concrete construction. We will also review some of the most important precautions for concreting during the hot season. What is Hot Weather for Concreting? Challenges of Hot Weather Concreting How does hot temperature affect concrete? We know that water is a main component in concrete.

Increase in the weather temperature increases the rate of vaporization, therefore, hot weather condition increases the water demand in concrete production. Other challenges of hot weather concreting can be summarized as: 1- Accelerated slump loss leading to the addition of water on the job-site, 2- Increased rate of Setting resulting in placing and finishing difficulties, 3- Increased tendency for thermal and plastic cracking, 4- Critical need for prompt early curing, 5- Difficulties in controlling entrained air, 6- Increased concrete temperature resulting in long term strength loss.

Precautions for Hot Weather Concreting Following general precautions will help in performing a successful concreting project in hot weather conditions, and mitigating the negative impacts of hot weather. These precautions would be helpful during concrete production and delivery, and will improve the durability performance of concrete by minimizing undesired cracking.

General Solutions for Cooling Materials The usual method of cooling concrete is to lower the temperature of the concrete materials before mixing. The aggregates and mixing water should be kept as cool as feasible as these materials have a greater influence on concrete temperature after mixing than other ingredients. In extreme hot condition, a portion of water can be replaced with ice to lower the temperature.

Curing of concrete plays a significant role in reducing the negative impacts of hot weather on the quality of concrete.

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ACI 305R-10

Full Description 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.

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ACI 305R-10 PDF

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