ACI 305R HOT WEATHER CONCRETING PDF

First, R defines hot weather and discuss potential problems associated with the construction operations of mixing, transporting, and placing of concrete materials. Then, R presents numerous, best practices and industry standards to help minimize the effects and mitigate the risks of hot weather on construction operations of concrete materials, including but not limited to selecting materials and proportions, precooling ingredients, and batching, for example. Join the leading contractors, owners and operators that leverage WeatherBuild API , data-as-a-service for partner solutions and internal applications. Join the leading contractors and owners that leverage WeatherBuild Notify , hyper-local weather risk reports with automated delivery to your project teams. WeatherBuild Blog August 22, Environmental factors affect concrete properties and the construction operations of mixing.

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When the temperature of freshly mixed concrete approaches approximately 77 degrees Fahrenheit adverse site conditions can impact the quality of concrete. Ambient temperatures above 90 degrees Fahrenheit and the lack of a protected environment for concrete placement and finishing enclosed building can contribute to difficulty in producing quality concrete.

The precautions required to ensure a quality end product will vary depending on the actual conditions during concrete placement and the specific application for which the concrete will be used. In general, if the temperature at the time of concrete placement will exceed 77 degrees Fahrenheit a plan should be developed to negate the effects of high temperatures. With proper planning and execution concrete can be successfully placed and finished to produce high quality durable concrete at temperatures of 95 degrees Fahrenheit or more.

Cement Industry Annual Yearbook U. Greg Halsted, P. Joshua Gilman, P. Hot Weather Concrete Construction. Things to Consider about Hot Weather Concreting When the temperature of freshly mixed concrete approaches approximately 77 degrees Fahrenheit adverse site conditions can impact the quality of concrete.

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Hot Weather Concreting Practices for Concrete Producers

Injection of liquid nitrogen into concrete truck. This limit is for general types of hot weather construction such as pavements, bridges, and buildings, not mass concrete. Various adverse effects on the properties and serviceability of concrete are brought on by hot weather. Just one of those is the effect on strength—concrete mixed, placed, and cured at elevated temperatures normally develops higher early strengths than concrete produced and cured at lower temperatures. Sign up now and reserve your spot! Damage to concrete caused by hot weather can never be fully alleviated.

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Hot Weather Concrete Construction

Concrete producers are well aware of the difficulty of delivering, handling, placing, finishing and curing concrete, especially during the hot summer months. While producers work hard to keep concrete temperatures down and use admixtures to minimise slump loss, there are still many things that can go wrong if precautions are not taken during hot weather. The American Concrete Institute ACI states that conditions such as high ambient temperature, high concrete temperature, low relative humidity and high wind speed tend to impair the quality of freshly mixed or hardened concrete by accelerating the rate of moisture loss and rate of cement hydration, or otherwise causing detrimental results. For example, the combination of heat, wind and low humidity can cause water to evaporate too quickly from the surface of the concrete, leading to unattractive plastic shrinkage cracks. Fortunately, there are measures you can take to protect against these problems. Concrete temperature. Every effort should be made to keep delivered concrete temperature as low as possible.

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American Concrete Institute Guide to Hot Weather Concreting

When the temperature of freshly mixed concrete approaches approximately 77 degrees Fahrenheit adverse site conditions can impact the quality of concrete. Ambient temperatures above 90 degrees Fahrenheit and the lack of a protected environment for concrete placement and finishing enclosed building can contribute to difficulty in producing quality concrete. The precautions required to ensure a quality end product will vary depending on the actual conditions during concrete placement and the specific application for which the concrete will be used. In general, if the temperature at the time of concrete placement will exceed 77 degrees Fahrenheit a plan should be developed to negate the effects of high temperatures. With proper planning and execution concrete can be successfully placed and finished to produce high quality durable concrete at temperatures of 95 degrees Fahrenheit or more.

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