The committee 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. We presented the full variation of this ebook in txt, pdf, djvu, epub, doc forms. Specification for hot weather concreting an aci standard reported by aci committee 305 specification for hot weather concreting. These practices include selecting materials and proportions, precooling ingredients, and batching. Aci 305 hot weather concreting defines hot weathers as any combination of the following conditions that tends to impair the quality of the freshly mixed or hardened concrete. Hot weather, as defined by aci 305r, is any combination of the following conditions that tends to impair the quality of freshly mixed or hardened concrete by. Aci 305r99 hot weather concreting browse product family. Aci 305r10, guide to hot weather concreting hot weather concreting. Provide sufficient labor to minimize the time required to place and finish the concrete, as hot weather conditions substantially shorted the times to initial and final set. Browse related products from american concrete institute. Most aci standards and committee reports are gathered together in the annually revised aci manual of. Hot weather may be defined as any period of high temperature in which special precautions need to be taken to ensure proper handling, placing, finishing and curing of concrete. Aci committee defines hot weather as any combination of high ambient temperature, high concrete temperature, low. Aci high winds low relative humidity solar radiation effects of hot weather concreting plastic shrinkage cracking accelerated slump loss loss of entrained air quicker set time thermal cracking best prepour practices plan and be prepared.
Aci 305r10 aci 305r99 chapter 1 introduction and scope, p. Precautions should be planned in advance to counter the effects of high temperature well in advance of execution to counter these effects. Aci committee defines hot weather as any combination of high ambient temperature, high concrete temperature, low relative. C, unless supporting field experience or preconstruction testing is available. Any combination of high ambient temperature, low relative humidity, solar radiation and wind defines hot weather, according to aci 305. Aci committee 305 defines hot weather as any combination of high ambient temperature, high concrete temperature, low relative humidity, wind speed and solar. Most backordered items can be rushed in from the publisher in as little as 24 hours. Hot weather problems are most frequently encountere. Aci305r10 guide to hot weather concreting defines hot weather, discusses potential problems, and presents practices intended to minimize them. Hot weather problems are most frequently encountered in the summer, but the associ. Aci 305 defines hot weather as any combination of high ambient temperature, high concrete temperature, low relative humidity, high wind speed, and excessive. In extremely hot weather or when concrete for massive s t ru c t u r es is being produced, use chilled batch water, add ice as p a r t of the batch water, or cool the concrete with liquid nitro g e n. Hot weather concreting problems, effects and precautions in.
Guide to hot weather concreting reported by aci committee 305 aci 305r10 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. Pdf 305r 10 guide to hot weather concreting read ebook. Guide to hot weather concreting reported by aci committee 305 aci 305r10 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. Hot weather concreting aci 305r99 concrete mixed, transported, and placed under conditions of high ambient temperature, low humidity, solar radiation, or wind, requires an under. Information from the national ready mixed concrete association what is hot weather. Temperature, volume changes, and cracking problems associated with mass concrete are treated more thoroughly in aci r, r, and r. Specification for hot weather concreting reapproved 2020 this reference specification provides requirements for hot weather concreting that the architectengineer can apply to any construction project involving hot weather concreting by citing it in the project specification. Prevent rapid evaporation from the fresh concrete surface monitor site conditions, including airtemperature, relative humidity, and wind speed to assess need for evaporative control measures beginning. Tom pelo area sales leader basf construction chemicals admixture division aci 305 definition of hot weather any combination of high ambient temperature, high concrete temperature, low relative humidity, wind velocity and solar radiation that impairs the quality of. Planning for hot weather conditions is essential because of the potential effects on fresh and recently placed concrete.
This specification covers requirements for hot weather concrete. Hot weather concreting aci 305r10 effects plastic shrinkage cracking although primarily associated with hotweather concrete, these typically occur within 30 minutes up to 6 hours. Look at the upcoming weather forecast hold a prepour conference tdot, the contractor, and the concrete. Guide to hot weather concreting american concrete institute. Pdf specification for hot weather concreting an aci. Neglect of protection against early freezing can cause immediate destruction or permanently weakened concrete. In typical siberia more than directly as dry download may be. In order to read a secure pdf, you will need to install the fileopen plugin on your computer. Aci r concrete mixed, transported, and placed under conditions of high ambient temperature, low humidity, solar. R 2002 standard specification for cold weather concreting aci 325. Aci r concrete mixed, transported, and placed under conditions of high ambient temperature, low humidity, solar radiation. Laboratory investigation, 92 2 erp29 does download aci r 10 guide diet disease number group and example through stress of analysis of internet and advantage of organizational cybercrime mp research.
American concrete institute technical committee docs codes and standards. Checklists are provided to assist the architectengineer in supplementing the provisions of this reference specification as needed by designating or. This specification supplements the contract documents and provides requirements for the contractor. Plastic shrinkage cracks are typically associated with hot weather. Hot weather resource guide american concrete institute aci 305 hot weather concreting national ready mixed concrete association cip12 hot weather concreting readable pdf copy on available to purchase at. American concrete institute guide to hot weather concreting.
Time delive r ies so placing delays d o nt cause long truck waiting p e ri o d s. For the purposes of this data sheet, hot weather is any combination of. Hot weather resource guide american concrete institute aci 305 hot weather concreting national ready mixed concrete association cip12 hot weather concreting readable pdf copy on. The committee 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. Aug 03, 2019 aci 305r hot weather concreting pdf hot weather concreting. Aug 22, 2016 environmental factors affect concrete properties and the construction operations of mixing.
This reference specification provides requirements for hot weather concreting that the architectengineer can apply to any construction project involving hot weather concreting by citing it in the project specification. Download aci 305r 10 guide to hot weather concreting. Aug 12, 2019 download aci 305r 10 guide to hot weather concreting. Hot weather resource guide american concrete institute. This specification governs for construction within its scope, but the contract documents govern if there is a conflict. Apr 25, 2020 the committee 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. Specification for hot weather concreting kindle edition by aci committee 305 in pdf format, then you have come on to the loyal website. Hot weather issues encountered in plastic concrete include. Hot weather along with relative humidity and wind speed also have a significant influence. Hot weather concreting national precast concrete association. Hot weather concrete spraylock concrete protection. Jun 30, 2019 aci 305r hot weather concreting pdf hot weather concreting.
Planning a successful, wellrun, hotweather project is the result of thorough and careful planning. A high ambient temperature is only one factor that indicates hotweather concreting conditions, according to aci 305, hot weather concreting. Concrete placement in hot weather planning, placing, and. Environmental factors, such as high ambient temperature, low humidity.
The american concrete institute aci, relies on the work of over 3,000 volunteers who serve on committees to develop the latest codes and reports related to concrete, including a committee on hot weather concrete practices. Planning a successful, wellrun, hot weather project is the result of thorough and careful planning. Di s c h a r ge concrete as soon as possible after mixing. Aci 305 defines hot weather as any combination of high ambient temperature, high concrete temperature, low relative humidity, high wind speed, and excessive solar radiation that can impair the quality of fresh or hardened concrete.
Temperature, volume changes, and cracking problems associated with mass concrete are treated more thoroughly in aci 207. Aci 305r10 guide to hot weather concreting american concrete institute 01oct2010 27 pages isbn. High temperature also accelerates cement hydration and contributes to the potential for thermal cracking in thicker concrete sections. Aci 305r hot weather concreting pdf hot weather concreting. Environmental factors affect concrete properties and the construction operations of mixing. Therefore, if cold weather concreting is performed, adequate protection.
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. These practices include suggested preparations and procedures for use in general types of hot weather construction, such as pavements, bridges, and buildings. Hot weather concreting, aci 305r, american concrete institute, farmington hills, mi. Hot weather concreting effect of hot weather on concrete. Aci r concrete mixed, transported, and placed under conditions of high. Concrete applications may be considered hot weather concrete at temperatures ranging from 77 to 95 degrees fahrenheit depending on the specific application. This specification covers requirements for hot weather concrete construction. Hot weather concreting problems, effects and precautions. Planning during hot weather concrete placements is recommended in aci 305 hot weather concreting. R 20 guide for design of jointed concrete pavements for streets and local roads. Aci 305r10 guide to hot weather concreting defines hot weather, discusses potential problems, and presents practices intended to minimize them. Successful hot weather concreting aci committee 305 defines hot weather as any combination of high ambient temperature, high concrete temperature, low relative humidity, wind speed and solar radiation. All of these should be focused on reducing and controlling temperatures and evaporation rates. Plastic shrinkage cracks can and do occur during cool and cold weather also it can occur any time ambient conditions produce rapid.
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