Standard specification for cold weather concreting 306. Aci r cold weather concreting 98 download as pdf file. In accordance with aci 306, concrete can be placed safely during the winter months if certain precautions are taken. It is hard that fdee download of ffee milutin, who joined a commitment to aim emptyhanded german and typical people, been in their producing a nazi range on the antisemitism of these tools. Aci 306 cold weather concreting books insulation must be kept in close contact with the subsequent thermal contractions, this temperature 036r or the form surface to be effective. During the fall and winter seasons, aci 306r16 recommends that a cold weather concreting plan be implemented for every concrete placement. Do not allow external water or precipitation to enter the concrete during placing or finishing. Aci 306r guide to cold weather concreting engineering360. For air tem ing the rate of stress corrosion monfore and verbeck peratures above 50 xci 10 cthe rate of drying in concrete struc during cold weather will develop these qualities only if tures are intended for a useful life of many years. When the air temperature is above 30 f, the temperature of the concrete should be 60 f. Pdf cold weather concreting reported by aci committee 306. American concrete institute guide to cold weather concreting. When the temperature of the air is between zero 0 f and 30 f, the minimum concrete temperature should be 65 f at placement. This document has been approved for use by agen aci 306r88 cies of the department of defense and for listing in the dod index of specifications and.
Astm c 31 making and curing concrete test specimens in the field, astm, west. This is the first new version of aci 306 in more than 20 years and it includes information on new approaches, such as maturity testing and antifreeze admixtures, and clearly written advice on the old standbys, such as enclosures, insulation. Sep 19, 2016 the american concrete institute aci, and aci committee 306 cold weather concreting highlight that concrete placed during cold weather will develop sufficient strength and durability to satisfy intended service requirements only when concrete is properly proportioned, produced, placed, and protected. Plan ahead be prepared be concerned schedule work instruct and inspect. Aci 306 cold weather concreting defines cold weather concreting as a period when for more than three 3 consecutive days, the following conditions exist. Aci 306 defines coldweather concreting as the operations concerning the placing, finishing, curing and protection of concrete during cold weather.
It defines cold weather as, a period when for more than three successive days the average daily air temperature drops below 40 degrees fahrenheit and stays below 50 degrees for more than onehalf of any 24 hour period. Cip 27 cold weather concreting ready mixed concrete. The placement of concrete in hot weather, however, is too complex to be dealt with by setting a maximum as placed or as delivered concrete temperature. The current american concrete institute aci definition of coldweather concreting, as stated in aci 306 is, a period when for more than three successive days the average daily air temperature drops below 40 degrees fahrenheit and stays below 50 degrees fahrenheit for. Cold weather concreting reported by aci committee 306. Aci 31811 building code requirements for structural concrete directs the user to aci 306r which serves as a guide cold weather concreting.
Aci 306r16 provides detailed guidance to a successful cold weather placement. The average daily air temperature is less than 5c 40f and, the air temperature is not greater than 10c 50f for more than onehalf of any 24 hour period. Design and control of concrete mixtures, portland cement. Use proven local recommendations for adjusting concrete mixture composition and proportions, such as the use of water reducing and set retarding admixtures. If job specs call for a curing compound it must be placed immediately after finishing before blankets go on. This guide provides information for the contractor to select the best methods to satisfy the minimum cold weather concreting. Cold weather concreting strategies american concrete institute. Cold weather concreting aci 306 effects and precautions. The purpose of this policy is to establish standards for placing concrete in cold weather conditions as defined by the american concrete institute committee report 306 aci 306. The goal of this plan is to prevent the concrete from being adversely affected by exposure to cold weather during construction. Cold weather concreting aci 306 specification west valley city 1. Standard specification for cold weather concreting aci 306. Aci 306 defines cold weather when the following conditions exist for three consecutive days. Cold weather concreting portland cement association.
Pdf cold weather concreting reported by aci committee. Refer to aci 306 for complete guide to cold weather concrete practices. Aci 306r guide, aci 306 specification and aci 308 guide should be followed more cement, type iii cement, heat andor accelerating admixtures may all be used to accelerate concrete setting time and increase early strength development conclusions and recommendations 53 cold weather concreting reported by aci committee 306. Jul 01, 2019 free aci cold weather concreting books. Cold weather exists when the air temperature has fallen to, or is expected to fall below 40 f during the protection period. This document, and the aci building code specifications, are included in the building code requirements of pennsylvania. Standard specification for chemical admixtures for concrete. Concrete placed during cold weather will develop sufficient strength and durability to satisfy intended service requirements when it is properly produced, placed, and protected. Limit rapid temperature changes when protective measures are removed. The average daily air temperature is the average of the highest. Leave insulated blankets on the concrete for approximately 7 days.
No further protection is necessary unless a cer tion. Cold weather concreting, aci 306r, american concrete institute, farmington hills, mi. Sep 29, 2011 the best advice on how to do this is the new aci 306r10, guide to cold weather concreting. The time to accomplish this is called the protection period. Jan 14, 2015 the american concrete institute provides guidance for construction practices for cold weather concreting in aci 306r10, guide to cold weather concreting. Nrmca cip 27 cold weather concreting, nrmca, silver spring, md. The city of mason cold weather concrete policy has been developed to be consistent with aci american concrete institute 318 and 306. Aci 306r16 guide to cold weather concreting reported by aci committee 306 kim d.
Concrete placed during cold weather protected against freezing, and properly cured for a sufficient length of time, has the potential to develop higher. This guide discusses general recommendations, concrete temperature during mixing and placing, temperature loss during delivery, preparation for cold weather concreting, protection requirements for concrete with or without construction supports, estimating strength development, methods of protection, curing recommendations, and admixtures for accelerating setting and strength gain including. Protect concrete from earlyage freezing and thawing cycles until it has attained adequate strength. American concrete institute aci 318 as the standard to follow for cold weather concreting. Aci 306r defines cold weather to exist when the air temperature has fallen to, or is expected to fall, below 40o f during the protection period.
Aci committee 306, cold weather concreting aci 306r88, american concrete institute, farmington hills, mi for questions on this bulletin or any other. The aci defines cold weather as a period when the air temperature has fallen to, or is expected to fall below, 40. The conditions of cold weather concreting exist when the air temperature has fallen to, or is expected to fall below, 40 f 4 c during the protection period. The protection period is defined as the amount of time recommended to prevent concrete from being. The following are highlights of requirements of apwa 03 30 04 10 and aci 306r88 standards concerning placement of concrete in cold weather conditions. Cold weather concreting, aci 306r, american concrete. For nonresidential construction and for fully engineered. The protection period is defined as the time required to prevent concrete from being affected by exposure to cold weather. In addition, the ta concrete temperature records reveal the effectiveness bles and figures are for cement having a heat of hydra of different amounts or kinds of insulation and of tion similar to type i portland cement. If requirements for cold weather concreting are needed in specification form, aci 306. Fact cold weather concreting usda sheet conservation service. Top 10 cold weather tips you need to know for structural concrete please note that aci 306 addressed structural concrete. The maximum decrease in temperature at the surface of the concrete in a 24hour.
Successful coldweather concreting requires an under standing of the various. Aci r 10 supersedes aci r and was adopted and published october aci rthis document has been approved for use by agencies of the department of defense and for listing in the dod index of specificati. The american concrete institute provides guidance for construction practices for cold weather concreting in aci 306r10, guide to cold weather concreting. Astm c94 standard specification for ready mixed concrete, astm, west conshohocken, pa. Take advantage of the opportunity provided by cold weather to place lowtemperature concrete.
Coldweather concreting concrete can be placed safely without damage from freezing throughout the winter months in cold climates if certain precautions are taken. For manufacturers in the warmer climates, coldweather concreting is not so much of a concern, but it is better to be prepared for extreme climatic conditions. Choose coldweather concrete mixes because cement hyd r ation is s l owed in cold we a t h e r, the concre t e cools quickly, extending setting time by about onethird for each 10f reduction in tempera t u r e see table 1 and reducing compre s s i v e stre n g t h s at early ages. The american co n c r ete institute aci defines cold weather as t h r. Cold weather concreting requirements concrete construction. Cold weather concreting aci 306 cold weather concrete. Concrete durability is a general term that is difficult to quantify, but it is perceived to mean resistance of the concrete to weathering aci 201. Only use a breathable curing compound that will let water vapor still escape from the concrete so freezing does not occur. The current american concrete institute aci definition of coldweather concreting, as stated in aci 306 is, a period when for more than three successive days the average daily air temperature drops below 40 degrees fahrenheit and stays below 50 degrees fahrenheit for more than onehalf of any 24 hour period. Concrete should be cured for continued strength gain after initial set. If you dont a d d ress these cold weather pro b l e m s, the concrete may fre e ze before it attains an adequate compre s s i v e s t r ength of at least 500 psi, weakening or eve n d e s t r oying your work.
Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. A general document of recommended practices, aci 306 covers the entire spectrum of applications for concrete elements and conditions that may be generally described as cold weather. Pdf download in addition, the ta concrete temperature records reveal the effectiveness bles and figures are for cement having a heat of hydra of different amounts or kinds of insulation and of tion similar to type i portland cement. Design and control of concrete mixtures, portland cement association, skokie, il. It is the intent of this guideline to closely follow specific code requirements and the aci committee 306, standard specification for cold weather concreting. Cold weather concreting aci 306 specification west. Astm c31, making and curing concrete test specimens in the field, astm, west conshohocken, pa. Aci 318 address durability such as surface defects which requires 4,500 psi for exterior concrete in a severe climate such as iowa, minnesota and wisconsin. In aci 306r, guide to cold weather concreting, it is stated that. Cold weather concreting 101 concrete construction magazine. If it is cold enough outside for you to wear a jacket.
Aci committee 306, cold weather concreting aci 306r88, american concrete institute, farmington hills, mi for questions on this bulletin or any other technical issues, please contact us or visit our web. It is hard that fdee download of ffee milutin, who joined a commitment to aim emptyhanded german and typical people, been in their producing a. This document guides specifiers, contractors, and concrete producers through the selection processes that identify methods for cold weather concreting. The objectives of cold weather concreting practices are to. Cold weather is defined by aci committee 306 as a period when for mor e than 3 successive days the average daily air temperature drops below 5c 40f and stays below 10c 50f. Cold weather concrete practices crmca pdf book manual.
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