Hot Weather Concreting. ACI R Concrete mixed, transported, and placed under conditions of high ambient temperature, low humidity, solar radiation. Uniformity of surface appearance. ACI R Guide to Hot Weather Concreting, states that “concrete can be produced in hot weather without maximum limits on. Specific hot weather issues encountered in plastic concrete ACI (the Code ) defers to ACI R (Hot Weather Concreting) which states that “it is.

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In Southwestern Idaho, a hot and arid climate, the critical evaporation rate is. Geo-Hydro provides environmental consulting services, geotechnical engineering, construction materials testing, and special inspection.

R Guide to Hot Weather Concreting

So what can one do in order to quickly estimate whether or not expected evaporation rates are moving into critical range? Your email address will not be published. The Zci Report ACI R, Hot Weather Concretingsays that hot is “any combination of the following conditions that tends 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:.

So evaporation rates are at or near the critical range, what do we do now? Leave a Reply Cancel reply Your email address will not be published.

We will also review some of the most important precautions for concreting during the hot season. Before taking the information provided on these websites as gospel, you must understand that forecasted evaporation rates are just that, forecasts.

Hot Weather Concreting Guidelines – Geo-Hydro Engineers, Inc.

This aaci process is often beyond the capabilities of an onsite crew during typical pour conditions. These practices include selecting materials and proportions, precooling ingredients, and batching. Once all of these factors are known the next step is to utilize the below nomograph figure courtesy of Portland Cement Association to correlate the expected evaporation rate. Increase in the weather temperature increases the rate of vaporization, therefore, hot weather condition increases the water demand in concrete production.


The full and complete returned product will be accepted if returned within 60 days of receipt and in salable condition.

Basically, concrete can be placed with favorable results during hot weather periods as long as all members of the construction cobcreting understand what is involved with hot weather concreting and all members of the construction team know what their role is to produce, place, test, and cure concrete appropriately. Here is a screen shot for the Boise, ID area based on a forecast performed on July 1, 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.

Concrete problems in hot weather include increased water demand, increased rate of setting, increased tendency for drying shrinkage, decreased durability, and greater variability of surface appearance. Your email address concretinh not be published. We’ll assume you’re ok with this, but you can opt-out if you wish. Why are concretinb rates of such concern during the hot summer months?

During hot summer months all projects benefit by implementing hot weather concrete practices. Relative humidity is obtained from local weather websites.

305R-10 Guide to Hot Weather Concreting

Other challenges of weathwr weather concreting can be summarized as:. This correlates with the conditions that we commonly see in the Treasure Valley during the summer. So, how does the evaporation rate fit into this condition? How does hot temperature affect concrete? Hot weather is defined by ACI R as any combination of the following conditions that tends to impair the quality of freshly mixed or hardened concrete by accelerating the rate of moisture loss and rate of cement hydration: The aggregates and mixing concretinb should be kept as cool as feasible as these materials have a greater influence on concrete temperature after mixing than other ingredients.


In this article, we will review how hot weather temperatures can affect the quality of concrete construction. Please choose a product format. These items are not eligible for return. But when you get to the end of that long detailed explanation, you probably still won’t know the answer to the question of exactly what’s hot.

Hot Weather Concreting Guidelines

American Concrete Institute ACI definition of hot weather condition, as stated in the ACIRrefers to job-site conditions that accelerate the rate of moisture loss or rate of cement hydration of freshly mixed concrete, including: Appropriate hot weather concreting practices are described in ACI R.

For a listing of and access to all product errata, visit the Errata page. These precautions would be helpful during concrete production and delivery, and will improve the durability performance of concrete by minimizing undesired cracking. The wewther method of cooling concrete is to lower the temperature of the concrete materials before mixing.

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. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page.

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