• is Concrete Maturity - NRMCA

    concrete with initial strength development that is a ... For concrete made with Type I portland cement, a value of 42 kJ/mol is suggested. ASTM ... consolidation and curing; d. Using datum temperature or activation energy values that are not representative of the concrete mixture

  • Curing of Cement Concrete - Time and Duration - The ...

    ACI 308 – Guide to Curing Concrete suggests three phases of concrete curing. These phases are shown in figure 1.6 of ACI 308. The right time of curing of concrete depends on: 1. Initial Curing . When the concrete is placed and compacted, bleeding of water occurs and rises through the surface of concrete due to the settlement of concrete.

  • Effect of Curing Temperatures on High Strength Concrete ...

    fied concrete ages. The cylinders were made from concrete poured in the midspan region of each girder. Test cylinders for the instrumented girders were made using two different methods of initial curing, namely, field-and match-curing. The field-cured cylinders were standard 6 x 12 in. (152 x 305 mm) specimens that were stored

  • Portland Cement Concrete Flashcards | Quizlet

    Stress-Strain Relationship. *be familiar with the stress-strain graph for concrete*. -increasing w/c decreases strength and stiffness, increases ductility. -stronger concrete is more brittle. Modulus of Elasticity. Ec = 4731 sqrt (f'c), MPa. Ec = 57000 sqrt (f'c), psi. Testing of Hardened Concrete.

  • Portland Cement Concrete Lab - Portland Cement Concrete ...

    For this lab, the value of air content found using the Press-R-Meter, which was 2%, could be used as the specimen air content since it was in a reasonable range. 4.2 Splitting Tensile Strength Test The splitting tensile strength test was performed on different concrete cylinder with different water cement ratio (W/C), cure method and age.

  • Curing Concrete Dos and Don'ts - Bob Vila

    Aug 22, 2017· DO pond cure concrete slabs. Pond curing is another great way to cure concrete, and the process is just as it sounds: You form temporary berms around a new concrete …

  • Assessing In Situ Stiffness of Curing Portland Cement ...

    tional P.e~etration .resistance and cylinder compression testing for ?etermmmg the stiffness of portland cement concrete during cur­ mg. Both surface wave velocity and penetration resistance exhibit simi~ar rates. of.increase during the initial stages of curing, sug­ gestmg that m situ measurements of wave velocity are potentially

  • 2019 Standard Specifications Sections 509 & 510

    510 –Portland Cement Concrete •Submittal requirements •Changes to initial curing of cylinders •In-place strength measurements •Low strength investigation •Pay factors. 510.3.1 –Submittals •Lists specific submittals •Submitted no later than 30 days before start of concrete work

  • Commonwealth of Pennsylvania Department of Transportation

    Care of Concrete Test Cylinders 89 j. Compressive Strength of Molded Cylinders 91 ... In an effort to assure quality of the Portland Cement Concrete used in Pennsylvania's pavements and structures, and to comply with Federal Highway Administration (FHWA) guidelines for concrete acceptance testing, the Pennsylvania ... Initial mixing times are ...

  • C31/C31M - NRMCA Expanding the Concrete Industry …

    that specimens with 2 days of initial curing exhibited strength reductions that were nearly the same as specimens with 1 day of initial curing. Table 3 shows the effect of initial curing under hot weather conditions on 28-day compressive strength.7 Concrete was mixed in a …

  • CHAPTER 9 - PORTLAND CEMENT CONCRETE - Springville

    CHAPTER 9 - PORTLAND CEMENT CONCRETE 9.1 GENERAL The work shall consist of furnishing, forming, placing, finishing, and curing Portland Cement concrete, as required. 9.2 MATERIALS 9.2.1 Portland Cement: Portland cement shall be Type II and shall comply with the Standard Specification for Portland Cement, ASTM C150.

  • Concrete quiz 2 Flashcards | Quizlet

    During initial curing, cylinders of 4000psi concrete shall be stored within a temperature range of _____. 60degrees F TO 80degrees F. ... What type of Portland cement is used in concrete where moderate sulfate resistance and air-entrainment are required? Type 11A.

  • Optimization of steam-curing regime for high-strength ...

    Each concrete was tested for compressive strength and modulus of elasticity using standard cylinders (100 × 200 mm [4 × 8 in.]). Modulus of elasticity was deter-mined at 18 hours on steam-cured cylinders. Compressive strength was determined on samples subjected to both air and steam curing. Additional cylinders were moist cured

  • MAKING AND CURING CONCRETE COMPRESSION AND …

    • 10, Sampling Fresh Portland Cement Concrete 3. APPARATUS ... 7.2 Initial Curing – During the first 24 to 48 hours after molding, all test specimens shall be ... tests that are performed on Portland cement concrete specimens. 9.1.1 4 cylinders (two 7-day, two 28-day breaks) 9.1.2 1 air test (if air entrained concrete…

  • Effects of curing conditions on properties of concrete ...

    Mar 01, 2000· For plain Portland cement concrete, elevated curing temperatures result in a coarser pore structure and a corresponding decrease in the resistance to chloride ion diffusion . The use of 30% slag replacement in concrete with water-to-binder ratio ( w / b ) of 0.40 and 0.50 is effective in reducing the chloride ion ingress probably due to a ...

  • CURING AND STORING CYLINDERS - tpub.com

    If desired, cap the top surface of freshly made cylinders with a thin layer of stiff portland cement paste, which you should then permit to harden and cure with the specimens. When finished, move the specimens to the storage place and leave them undisturbed for the initial curing period.

  • Influence of initial curing on the properties of concrete ...

    May 01, 2000· Three concrete mixtures (water/cementitious=0.5) containing a portland and two limestone blended cements were subjected to three different initial curing regimens (full, wet, and air curing). Results show that mechanical properties of concrete containing limestone blended cement are less affected by the cessation of moist curing at early ages.

  • INITIAL CURING OF PORTLAND CEMENT CONCRETE CYLINDERS

    The concrete industry believes that inconsistent initial curing conditions of Portland Cement Concrete (PCC) test cylinders produce inconsistent and non-representative 28-{fay compressive strength results. This increases costs due to further testing of in-place concrete and …

  • Importance of Initial Curing Conditions of Test Cylinders

    Nov 09, 2018· Want to learn more about what concrete curing is? Read this blog. Initial On-Site Curing. ACI 318-14, 301-16, 311.6-09 state that acceptance test specimens need to be standard-cured in accordance with ASTM C31/C31M. After the cylinders are molded, ambient temperature and humidity are to be monitored and maintained.

  • The 28-Day Myth - National Precast Concrete Association

    Oct 28, 2013· Inadequate curing can substantially reduce the expansion level. ACI 223 states that after expansion (if properly consolidated, finished and cured) the tensile, flexural, and compressive strength development of expansive cement concrete is similar in rate and magnitude to that of a standard portland cement concrete.

  • Concrete Curing — Colorado Department of Transportation

    Initial Curing of Portland Cement Concrete Cylinders. Research Report 1999-4, Authors: Reza Akhavan, Monte Malik, Keywords: Concrete Curing. Internal Curing of High Performance Concrete Using Lightweight Aggregates and Other Techniques.

  • Role of Concrete Curing - Portland Cement Association

    Steve Kosmatka et al, Design and Control of Concrete Mixtures, 15th Edition, EB001, PCA Engineering Bulletin EB 001, Portland Cement Association, Skokie, IL 2002. Specifications for Structural Concrete, ACI 301 () Guide to Curing Concrete, ACI 308R-01 ()

  • Curing Concrete – Normal, Hot and Cold Weather

    Curing Concrete – Normal, Hot and Cold Weather. Introduction Portland cement consists of several complex chemical compounds (see composition of cement).In the preparation of concrete, the cement acts as a glue which bonds together the …

  • INITIAL CURING OF PORTLAND CEMENT CONCRETE CYLINDERS

    INITIAL CURING OF PORTLAND CEMENT CONCRETE CYLINDERS. Colorado Ready Mixed Concrete Association (CRMCA) task force members feel that AASHTO T 23-93, Section 9.2.1, "Standard Specification for Making and Curing Concrete Test Specimens in the Field," allows wide variance when describing the initial curing condition requirements.

  • is Concrete Maturity - NRMCA

    concrete with initial strength development that is a ... For concrete made with Type I portland cement, a value of 42 kJ/mol is suggested. ASTM ... consolidation and curing; d. Using datum temperature or activation energy values that are not representative of the concrete mixture

  • Curing of Cement Concrete - Time and Duration - The ...

    ACI 308 – Guide to Curing Concrete suggests three phases of concrete curing. These phases are shown in figure 1.6 of ACI 308. The right time of curing of concrete depends on: 1. Initial Curing . When the concrete is placed and compacted, bleeding of water occurs and rises through the surface of concrete due to the settlement of concrete.

  • Effect of Curing Temperatures on High Strength Concrete ...

    fied concrete ages. The cylinders were made from concrete poured in the midspan region of each girder. Test cylinders for the instrumented girders were made using two different methods of initial curing, namely, field-and match-curing. The field-cured cylinders were standard 6 x 12 in. (152 x 305 mm) specimens that were stored

  • Portland Cement Concrete Flashcards | Quizlet

    Stress-Strain Relationship. *be familiar with the stress-strain graph for concrete*. -increasing w/c decreases strength and stiffness, increases ductility. -stronger concrete is more brittle. Modulus of Elasticity. Ec = 4731 sqrt (f'c), MPa. Ec = 57000 sqrt (f'c), psi. Testing of Hardened Concrete.

  • Portland Cement Concrete Lab - Portland Cement Concrete ...

    For this lab, the value of air content found using the Press-R-Meter, which was 2%, could be used as the specimen air content since it was in a reasonable range. 4.2 Splitting Tensile Strength Test The splitting tensile strength test was performed on different concrete cylinder with different water cement ratio (W/C), cure method and age.

  • Curing Concrete Dos and Don'ts - Bob Vila

    Aug 22, 2017· DO pond cure concrete slabs. Pond curing is another great way to cure concrete, and the process is just as it sounds: You form temporary berms around a new concrete …

  • Assessing In Situ Stiffness of Curing Portland Cement ...

    tional P.e~etration .resistance and cylinder compression testing for ?etermmmg the stiffness of portland cement concrete during cur­ mg. Both surface wave velocity and penetration resistance exhibit simi~ar rates. of.increase during the initial stages of curing, sug­ gestmg that m situ measurements of wave velocity are potentially

  • 2019 Standard Specifications Sections 509 & 510

    510 –Portland Cement Concrete •Submittal requirements •Changes to initial curing of cylinders •In-place strength measurements •Low strength investigation •Pay factors. 510.3.1 –Submittals •Lists specific submittals •Submitted no later than 30 days before start of concrete work

  • Commonwealth of Pennsylvania Department of Transportation

    Care of Concrete Test Cylinders 89 j. Compressive Strength of Molded Cylinders 91 ... In an effort to assure quality of the Portland Cement Concrete used in Pennsylvania's pavements and structures, and to comply with Federal Highway Administration (FHWA) guidelines for concrete acceptance testing, the Pennsylvania ... Initial mixing times are ...

  • C31/C31M - NRMCA Expanding the Concrete Industry …

    that specimens with 2 days of initial curing exhibited strength reductions that were nearly the same as specimens with 1 day of initial curing. Table 3 shows the effect of initial curing under hot weather conditions on 28-day compressive strength.7 Concrete was mixed in a …

  • CHAPTER 9 - PORTLAND CEMENT CONCRETE - Springville

    CHAPTER 9 - PORTLAND CEMENT CONCRETE 9.1 GENERAL The work shall consist of furnishing, forming, placing, finishing, and curing Portland Cement concrete, as required. 9.2 MATERIALS 9.2.1 Portland Cement: Portland cement shall be Type II and shall comply with the Standard Specification for Portland Cement, ASTM C150.

  • Concrete quiz 2 Flashcards | Quizlet

    During initial curing, cylinders of 4000psi concrete shall be stored within a temperature range of _____. 60degrees F TO 80degrees F. ... What type of Portland cement is used in concrete where moderate sulfate resistance and air-entrainment are required? Type 11A.

  • Optimization of steam-curing regime for high-strength ...

    Each concrete was tested for compressive strength and modulus of elasticity using standard cylinders (100 × 200 mm [4 × 8 in.]). Modulus of elasticity was deter-mined at 18 hours on steam-cured cylinders. Compressive strength was determined on samples subjected to both air and steam curing. Additional cylinders were moist cured

  • MAKING AND CURING CONCRETE COMPRESSION AND …

    • 10, Sampling Fresh Portland Cement Concrete 3. APPARATUS ... 7.2 Initial Curing – During the first 24 to 48 hours after molding, all test specimens shall be ... tests that are performed on Portland cement concrete specimens. 9.1.1 4 cylinders (two 7-day, two 28-day breaks) 9.1.2 1 air test (if air entrained concrete…

  • Effects of curing conditions on properties of concrete ...

    Mar 01, 2000· For plain Portland cement concrete, elevated curing temperatures result in a coarser pore structure and a corresponding decrease in the resistance to chloride ion diffusion . The use of 30% slag replacement in concrete with water-to-binder ratio ( w / b ) of 0.40 and 0.50 is effective in reducing the chloride ion ingress probably due to a ...

  • CURING AND STORING CYLINDERS - tpub.com

    If desired, cap the top surface of freshly made cylinders with a thin layer of stiff portland cement paste, which you should then permit to harden and cure with the specimens. When finished, move the specimens to the storage place and leave them undisturbed for the initial curing period.

  • Influence of initial curing on the properties of concrete ...

    May 01, 2000· Three concrete mixtures (water/cementitious=0.5) containing a portland and two limestone blended cements were subjected to three different initial curing regimens (full, wet, and air curing). Results show that mechanical properties of concrete containing limestone blended cement are less affected by the cessation of moist curing at early ages.

  • INITIAL CURING OF PORTLAND CEMENT CONCRETE CYLINDERS

    The concrete industry believes that inconsistent initial curing conditions of Portland Cement Concrete (PCC) test cylinders produce inconsistent and non-representative 28-{fay compressive strength results. This increases costs due to further testing of in-place concrete and …

  • Importance of Initial Curing Conditions of Test Cylinders

    Nov 09, 2018· Want to learn more about what concrete curing is? Read this blog. Initial On-Site Curing. ACI 318-14, 301-16, 311.6-09 state that acceptance test specimens need to be standard-cured in accordance with ASTM C31/C31M. After the cylinders are molded, ambient temperature and humidity are to be monitored and maintained.

  • The 28-Day Myth - National Precast Concrete Association

    Oct 28, 2013· Inadequate curing can substantially reduce the expansion level. ACI 223 states that after expansion (if properly consolidated, finished and cured) the tensile, flexural, and compressive strength development of expansive cement concrete is similar in rate and magnitude to that of a standard portland cement concrete.

  • Concrete Curing — Colorado Department of Transportation

    Initial Curing of Portland Cement Concrete Cylinders. Research Report 1999-4, Authors: Reza Akhavan, Monte Malik, Keywords: Concrete Curing. Internal Curing of High Performance Concrete Using Lightweight Aggregates and Other Techniques.

  • Role of Concrete Curing - Portland Cement Association

    Steve Kosmatka et al, Design and Control of Concrete Mixtures, 15th Edition, EB001, PCA Engineering Bulletin EB 001, Portland Cement Association, Skokie, IL 2002. Specifications for Structural Concrete, ACI 301 () Guide to Curing Concrete, ACI 308R-01 ()

  • Curing Concrete – Normal, Hot and Cold Weather

    Curing Concrete – Normal, Hot and Cold Weather. Introduction Portland cement consists of several complex chemical compounds (see composition of cement).In the preparation of concrete, the cement acts as a glue which bonds together the …

  • INITIAL CURING OF PORTLAND CEMENT CONCRETE CYLINDERS

    INITIAL CURING OF PORTLAND CEMENT CONCRETE CYLINDERS. Colorado Ready Mixed Concrete Association (CRMCA) task force members feel that AASHTO T 23-93, Section 9.2.1, "Standard Specification for Making and Curing Concrete Test Specimens in the Field," allows wide variance when describing the initial curing condition requirements.