aci土木混凝土评定协会strength ACI214R-02supersedesACI214R-77(reapproved1997)andbecameeffectiveJune27,2002.Copyright©2002,AmericanConcreteInstitute.Allrightsreservedincludingrightsofreproductionanduseinanyformorbyanymeans,includingthemakingofcopiesbyanyphotoprocess,orbyelectronicormechanicaldevice,printed,written,or...
Concrete cylinders at the same age. that are not protected from temperatures outside the range Range or within-test range—the difference between the specified in ASTM C 31 may not accurately reflect the maximum and minimum strengths of individual concrete potential strength of the concrete. ...
Keywords: admixtures; aggregates; anchorage (structural); beam-column frame; beams (supports); building codes; cements; cold weather construction; columns (supports); combined stress; composite construction (concrete and steel); composite construction (concrete to concrete); compressive strength; ...
Controlling the maximum and minimum concrete temperatures throughout all seasons of the year is important. Concrete can be cooled using ice, chilled mixing water, chilled aggregates, or liquid nitrogen. In-place concrete temperatures as low as 40 F (4 C) are not unusual. Liquid nitrogen at a...
Life reinforced concrete structure satisfying this chapter.” This safety and toughness are theoretically enhanced by mild document defines the minimum experimental evidence steel reinforcement grouted across the wall to foundation required to validate the use of special unbonded post- interface. The ...
ACI 318 and CSA A23.3 should be modified to include size effect terms and use the cube root of the concrete strength. A minimum flexural reinforcement ratio of 0.75% should be specified in regions susceptible to punching shear. The consequences of permitting use of a rectangular control ...
Current U.S. building codes limit rebar strength based on decades-old research, with most reinforcement used in concrete construction in the United States being Grade 60. Producers are now able to produce rebar, however, that is almost twice as strong as it was several decades ago. ACI 318-...
The design procedure is computer-aided rather than automatic, computes the minimum reinforcement required for a given width and depth, and displays the resulting interaction diagram. The program also computes and prints the minimum effective depth of a given section which satisfies strength requirements...
The engineer on our current project did not specify a minimum concrete temperature, the spec says to place concrete in accordance with ACI-301-05. The answer is an easy one during the prescribed 'cold weather' but if we are not in cold weather concrete (1)is there a minimum temperature ...
If you are within the 500psi limit (5.6.3.3(b)) but are below the required f'c (5.6.3.3(a)) then what you are required to do is take steps to increase the concrete strength. This is outlined in the commentary of 5.6.3.4. You do NOT have to take cores, or do anything else.....