Concrete inFocus - Fall 2017 - OC15

(ACI 318-14) Table 19.3.2.1 - Requirements for Concrete by Exposure Class
Additional Requirements
Exposure Class

Max w/cm(1)

Maximum Water-Soluble Chloride Ion (Cl -) Content
in Concrete, Percent by Weight of Cement(7)

Min ƒ´c , psi

Nonprestressed Concrete

Prestressed Concrete

Additional Provisions

C0

N/A

2500

1.00

0.06

None

C1

N/A

2500

0.30

0.06

None

C2

0.40

5000

0.15

0.06

Concrete cover(8)

 ater-soluble chloride ion content that is contributed from the ingredients including water, aggregates, cementitious materials, and admixtures shall be determined
W
on the concrete mixture by ASTM C1218 at age between 28 and 42 days.
(8)
Concrete cover shall be in accordance with 20.6.
(7)

Table 1: Concrete Material Requirements (Based on ACI 318-14)
Durability Exposure
Member

Mix ID

F

S

W

C

Specified Max w/cm or
Nom. max
Air
Strength, Performance
Aggregate, in. Content
ƒ´c , psi
Alternative

Slump/
Chloride Temp.
Slump
Limit Limits
Flow

Footings
Foundation Walls
Slabs-on-grade
Exterior slabs
Suspended slabs (interior)
Suspended slabs (exterior)
Frame members
Columns (interior)
Columns (exterior)
Walls (interior)
Concrete toppings

to chloride penetration are selected (8). There is no technical merit in
specifying a minimum cementitious content for corrosion protection of
reinforcement (9, 10). To minimize the potential for cracking, shrinkage requirements can be considered. See section on Water Exposure
for shrinkage test criteria.
State the concrete material requirements as shown in Table 1.

COMMENTS PERTAINING TO TABLE 1
Specify strength that is the higher of that required for structural
design or durability based on assigned exposure class. Specify strength
at 28 days or other selected age.
Select water-cementitious materials ratio (w/cm) only if in-service
durability exposure conditions are applicable to the structural member. Select the lowest w/cm as required for the durability Exposure
Class assigned. Coordinate water-cementitious materials ratio with
compressive strength. Consider performance alternatives to w/cm
as suggested.
Select nominal maximum size of aggregate as the smallest based
on (1) 1/5 narrowest dimension between sides of forms, (2) 1/3 depth
of slabs or (3) ¾ minimum clear spacing between reinforcement.

Select air content based on the durability exposure classification.
For hard-trowel finished slabs, specify that air content should not
exceed 3.0%. The air content limit should be avoided for structural
lightweight members when equilibrium density is important for fire
rating or design loads. Hard-troweled finishes can be obtained with
proper timing and procedures.
The required slump or slump flow (for SCC) of concrete will be
selected by the contractor and notified to the architect/engineer. Slump
or slump flow during delivery shall be at the level documented with
applicable tolerances in ASTM C94. Select water soluble chloride
limits if concrete is exposed to exposure class C1, C2 or C3 as stated
in Appendix A.
Select temperature limits as follows:
(a)	Concrete temperature as delivered shall not exceed [95°F]. If
concrete delivered in hot weather with a temperature higher than
95°F has been used successfully in given climates or situations, the
higher temperature may be specified in place of the 95°F limit.
(b)	In cold weather, concrete temperature as delivered shall not be
less than [55°F for section size <12 in] [50°F for 12-36 in] [45°F
for 36-72] [40°F for >72 in].
concrete INFOCUS

ı

OC15



Table of Contents for the Digital Edition of Concrete inFocus - Fall 2017

From the President’s Desk
Corporate Suite
Enviroscene
2017 National Ready Mixed Concrete Association Fleet Benchmarking and Costs Survey
The Root Causes of Poor Communication
Insulating Concrete Forms for Commercial Construction
Engineering: Specifying for Performance
View from Capitol Hill: State of Play of U.S. Infrastructure
2017 Service & Supply Buyers’ Guide
2017 Products & Services Suppliers Guide
Index of Advertisers
Concrete inFocus - Fall 2017 - Intro
Concrete inFocus - Fall 2017 - bellyband1
Concrete inFocus - Fall 2017 - bellyband2
Concrete inFocus - Fall 2017 - cover1
Concrete inFocus - Fall 2017 - cover2
Concrete inFocus - Fall 2017 - 3
Concrete inFocus - Fall 2017 - 4
Concrete inFocus - Fall 2017 - 5
Concrete inFocus - Fall 2017 - 6
Concrete inFocus - Fall 2017 - 7
Concrete inFocus - Fall 2017 - 8
Concrete inFocus - Fall 2017 - From the President’s Desk
Concrete inFocus - Fall 2017 - 10
Concrete inFocus - Fall 2017 - Corporate Suite
Concrete inFocus - Fall 2017 - 12
Concrete inFocus - Fall 2017 - 13
Concrete inFocus - Fall 2017 - Enviroscene
Concrete inFocus - Fall 2017 - 15
Concrete inFocus - Fall 2017 - 16
Concrete inFocus - Fall 2017 - 17
Concrete inFocus - Fall 2017 - 2017 National Ready Mixed Concrete Association Fleet Benchmarking and Costs Survey
Concrete inFocus - Fall 2017 - 19
Concrete inFocus - Fall 2017 - 20
Concrete inFocus - Fall 2017 - 21
Concrete inFocus - Fall 2017 - 22
Concrete inFocus - Fall 2017 - 23
Concrete inFocus - Fall 2017 - 24
Concrete inFocus - Fall 2017 - 25
Concrete inFocus - Fall 2017 - The Root Causes of Poor Communication
Concrete inFocus - Fall 2017 - 27
Concrete inFocus - Fall 2017 - 28
Concrete inFocus - Fall 2017 - 29
Concrete inFocus - Fall 2017 - Insulating Concrete Forms for Commercial Construction
Concrete inFocus - Fall 2017 - 31
Concrete inFocus - Fall 2017 - 32
Concrete inFocus - Fall 2017 - 33
Concrete inFocus - Fall 2017 - 34
Concrete inFocus - Fall 2017 - 35
Concrete inFocus - Fall 2017 - 36
Concrete inFocus - Fall 2017 - 37
Concrete inFocus - Fall 2017 - 38
Concrete inFocus - Fall 2017 - 39
Concrete inFocus - Fall 2017 - Engineering: Specifying for Performance
Concrete inFocus - Fall 2017 - 41
Concrete inFocus - Fall 2017 - 42
Concrete inFocus - Fall 2017 - 43
Concrete inFocus - Fall 2017 - View from Capitol Hill: State of Play of U.S. Infrastructure
Concrete inFocus - Fall 2017 - 45
Concrete inFocus - Fall 2017 - 46
Concrete inFocus - Fall 2017 - 2017 Service & Supply Buyers’ Guide
Concrete inFocus - Fall 2017 - 48
Concrete inFocus - Fall 2017 - 49
Concrete inFocus - Fall 2017 - 50
Concrete inFocus - Fall 2017 - 2017 Products & Services Suppliers Guide
Concrete inFocus - Fall 2017 - 52
Concrete inFocus - Fall 2017 - Index of Advertisers
Concrete inFocus - Fall 2017 - 54
Concrete inFocus - Fall 2017 - cover3
Concrete inFocus - Fall 2017 - cover4
Concrete inFocus - Fall 2017 - OC1
Concrete inFocus - Fall 2017 - OC2
Concrete inFocus - Fall 2017 - OC3
Concrete inFocus - Fall 2017 - OC4
Concrete inFocus - Fall 2017 - OC5
Concrete inFocus - Fall 2017 - OC6
Concrete inFocus - Fall 2017 - OC7
Concrete inFocus - Fall 2017 - OC8
Concrete inFocus - Fall 2017 - OC9
Concrete inFocus - Fall 2017 - OC10
Concrete inFocus - Fall 2017 - OC11
Concrete inFocus - Fall 2017 - OC12
Concrete inFocus - Fall 2017 - OC13
Concrete inFocus - Fall 2017 - OC14
Concrete inFocus - Fall 2017 - OC15
Concrete inFocus - Fall 2017 - OC16
Concrete inFocus - Fall 2017 - OC17
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