ACI 305.1-14 Specification for Hot Weather Concreting
detrimental results high ambient temperature high concrete temperature low relative humidity and high wind speed. 1.3—Reference Standards Standards of ACI and ASTM cited in this specification are listed by name and designation including year. 1.3.1 American Concrete Institute ACI 301-10—Specifications for Structural Concrete
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ASTM C31ACI Making and Curing Concrete Test Specimens
If the concrete design strength is 6 000 psi or greater the initial curing temperature must range from 6878 degrees F. Specimens should be shielded from direct sunlight or radiating heating devices if used. A minimum-maximum thermometer shall record the temperature of the initial curing period and then recorded upon retrieval of cylinders.
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STRUCTURE magazine Cold and Hot Weather Concrete
Since the ACI 306R-10 edition cold weather concrete applies when the air temperature is below 40 degrees or is expected to be below 40 degrees during the protection period. The protection period is defined as being between one and four days for concrete
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207.1R-05 Guide to Mass Concrete
Cooling and insulating systems for mass concrete are addressed in ACI 207.4R. Mixture proportioning for mass concrete is discussed in ACI 211.1. 1.2—History When concrete was first used in dams the dams were relatively small and the concrete was mixed by hand. The portland cement usually had to be aged to comply with a
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ASTM C31ACI Making and Curing Concrete Test Specimens
If the concrete design strength is 6 000 psi or greater the initial curing temperature must range from 6878 degrees F. Specimens should be shielded from direct sunlight or radiating heating devices if used. A minimum-maximum thermometer shall record the temperature of the initial curing period and then recorded upon retrieval of cylinders.
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306R-88 Cold Weather Concreting
Maximum allowable gradual temperature drop in first 24 hr after end of protection 550 F (28 C) 40 F (22 C) 30 F (17 C) 20 F (11 C) For colder weather a greater margin in temperature is provided between concrete as mixed and required minimum temperature of fresh concrete in place. 1.4.3 -Where a specified concrete strength must be
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Temperatures. ACI 301 provides two recommended temperature limits a) The maximum concrete temperature shall not exceed 160 degrees Fahrenheit during curing and b) The maximum temperature differential between the center and surface of placement shall not exceed 35 degrees Fahrenheit.
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(PDF) Specification for Hot Weather Concreting An ACI
Use these materials and methods in accordance with ACI 308.1. 3.7-Concrete curing3.7.1 Concrete curing-Cure concrete in accordance with ACI 308.1. 3.8-Concrete protection3.8.1 Protection period-Protect the concrete against thermal shrinkage cracking due to rapid drops in concrete temperature greater than 22 °C (40 °F) during the first 24
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304R-00 Guide for Measuring Mixing Transporting and
neers (1994a) ASTM C 94 ACI 311.1R and ACI 318. To portray more clearly certain principles involved in achieving maximum uniformity homogeneity and quality of concrete in place figures that illustrate good and poor practices are also included in this guide. 1.3— Other considerations All who are involved with concrete work should know the
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Maximum temperature limits for hot-weather concreting
According to ACI 305.1-14 qualification of a concrete mixture with a maximum concrete temperature that exceeds 95°F (35 ºC) shall be supported by successful past field experience or preconstruction testing.
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Structural Design Considerations
ACI 350R-89 " This report presents recommendations for structural design materials and construction of concrete tanks reservoirs and other structures commonly used in water containment industrial and domestic water and wastewater treatment works where dense impermeable concrete with high resistance to chemical attack is required."
Get Price201.2R-08 Guide to Durable Concrete
Most ACI standards and committee reports are gathered together in the annually revised ACI Manual of Concrete Practice (MCP). American Concrete Institute 38800 Country Club Drive Farmington Hills MI 48331 U.S.A. Phone Fax concrete
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305R-99 Hot Weather Concreting
ings. Temperature volume changes and cracking problems associated with mass concrete are treated more thoroughly in ACI 207.1R and ACI 224R. A maximum "as placed" concrete temperature is often used in an effort to control strength durability plastic-shrinkage cracking thermal cracking and
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ACI 306R-16 Guide to Cold Weather Concreting
ACI 306R-16 Guide to Cold Weather Concreting Author ACI Committee 306 Subject This document guides specifiers contractors and concrete producers through the selection processes that identify methods for cold weather concreting.
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Minimum Concrete TemperatureACI (concrete) Code Issues
Dec 29 2010 · A minimum temperature is not often specified for the concrete. It is usually in the form of air temperature. As a practical matter you would like to see the concrete temperature not go below 40F. At about 39F the density of water decreases and continues to decrease until it freezes.
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308R-01 Guide to Curing Concrete
factory concrete temperature under specific environmental conditions are addressed in greater detail by Committees 305 and 306 on Hot and Cold Weather Concreting respectively and by ACI
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306R-16 Guide to Cold Weather Concreting
The concrete temperature during placement should be near the temperature values in Table 5.1 and should not be higher than these values by more than 20°F (11°C). The recommended minimum placement temperatures given in Table 5.1 apply to normalweight concrete.
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Modifications to ACI 301American Concrete Institute
ACI 301 has always contained limits on the minimum and maximum temperatures of delivered concrete for both hot and cold weather concrete applications. Previous versions specified a maximum concrete temperature of 90°F. ACI 301-10 specifies a maximum temperature of 95°F. There are also other requirements in ACI 301-10 related to
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ASTM C31ACI Making and Curing Concrete Test Specimens
If the concrete design strength is 6 000 psi or greater the initial curing temperature must range from 6878 degrees F. Specimens should be shielded from direct sunlight or radiating heating devices if used. A minimum-maximum thermometer shall record the temperature of the initial curing period and then recorded upon retrieval of cylinders.
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Jan 14 2015 · ACI 306 Section 10.4.3 states "Take advantage of the opportunity provided by cold weather to place low temperature concrete " then goes on to note that concrete placed at ambient air temperatures of 55° F down to around 40° F has the potential to develop higher ultimate strengths and durability than concrete placed at what might be termed more "normal" or higher temperatures.
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Concrete Discharge Time Requirements and Consequences of
Concrete discharge time requirements ensures that hardened concrete would meet requirements set at design stage. It is the time available for placement of concrete in formworks after it has been mixed. When water is added to dry mixture chemical reactions would occur. Water content declines as a result of chemical reactions and consequently concrete workability
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304R-00 Guide for Measuring Mixing Transporting and
neers (1994a) ASTM C 94 ACI 311.1R and ACI 318. To portray more clearly certain principles involved in achieving maximum uniformity homogeneity and quality of concrete in place figures that illustrate good and poor practices are also included in this guide. 1.3— Other considerations All who are involved with concrete work should know the
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302.1R-04 Guide for Concrete Floor and Slab Construction
CONCRETE FLOOR AND SLAB CONSTRUCTION 302.1R-3 The design of slabs-on-ground should conform to the recommendations of ACI 360R. Refer to ACI 223 for procedures for the design and construction of shrinkage-compensating concrete slabs-on-ground. The design of suspended floors should conform to requirements of ACI 318 and ACI 421.1R.
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Cold Weather Concreting Placing Requirements
Aug 22 2020 · As per ACI 306-R10 Cold Weather Concreting is defined as a concreting processmixing pouring and curing below atmospheric temperature of 4o Celsius (40 o F) over the recommended protection period as per the specifications.
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Code and Standards Requirements For Acceptance Testing
• Fresh Concrete tests • Slump or slump flowtolerances in ASTM C94 ACI 117 • Air contenttolerance ±1.5 • Temperaturelimits in specifications • Densitytypically no limits unless its lightweight concrete • Strength specimens • Average of two 6x12 in or three 4x8 in cylindrical specimens
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Cold Weather Concreting Requirements Concrete
Jan 14 2015 · ACI 306 Section 10.4.3 states "Take advantage of the opportunity provided by cold weather to place low temperature concrete " then goes on to note that concrete placed at ambient air temperatures of 55° F down to around 40° F has the potential to develop higher ultimate strengths and durability than concrete placed at what might be termed more "normal" or higher temperatures.
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Shrinkage and Temperature Reinforcement Engineersdaily
The code requirements for prestressing tendons used for shrinkage and temperature reinforcement might provide a starting place. Section 7.12.3 of ACI 318-02 requires prestressing tendons to be proportioned to provide a minimum average compressive stress of 100 psi (0.7 MPa) on gross concrete
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What is the minimum and maximum temperature of concrete
May 06 2020 · Concrete Temperature Limits Least dimensions of sections cm Minimum temperature of concrete as placed and maintained during the protection period °C Less than 30.48 12.77 30.48 to less than 91.44 10 91.44 to less than 182.88 7.22 Greater than 182.88 4.44
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A Review of ACI 301 Section 4 Concrete Mixtures
A Review of ACI 301 Section 4 Concrete Mixtures Bill Goodloe Technical Services Manager CEMEX . General Scope Submittals Quality Control Products Materials Performance and design requirements Cementitious content Slump Size of Coarse Aggregate Air content Temperature Resistance to ASR Durability Sulfate resistance Freeze-thaw resistance Low
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