Concrete inFocus - Fall 2017 - 41

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

Exposure
Class

Max w/
cm(1)

Min ƒ´c ,
psi

S0

N/A

2500

S1

0.50

4000

S2

0.45

4500

V(5)

S3

0.45

4500

V plus pozzolan or
slag cement(6)

ASTM C150
No type restriction
II

(4)(5)

Cementitious Materials(3) - Types
ASTM C595
ASTM C1157
No type restriction
No type restriction
Types IP, IS, or IT with
MS
(MS) designation
Types IP, IS, or IT with
HS
(HS) designation
Types IP, IS, or IT with
HS plus pozzolan or
(MS) designation plus
slag cement(6)
pozzolan or slag cement(6)

Calcium Chloride
Admixture
No restriction
No restriction
Not permitted
Not permitted

The maximum w/cm limits in Table 19.3.2.1 do not apply to lightweight concrete.
Alternative combinations of cementitious materials to those listed in Table 19.3.2.1 are permitted when tested for sulfate resistance and meeting the
criteria in 26.4.2.2(c).
(4)
For seawater exposure, other types of portland cements with tricalcium aluminate (C3A) contents up to 10 percent are permitted if the w/cm does not exceed 0.40.
(5)
Other available types of cement such as Type I or Type III are permitted in Exposure Classes S1 or S2 if the C3A contents are less than 8 percent for Exposure
Class S1 or less than 5 percent for Exposure Class S2.
(6)
The amount of the specific source of the pozzolan or slag cement to be used shall be at least the amount that has been determined by service record to improve
sulfate resistance when used in concrete containing Type V cement.
(1)

(3)

indicates that the scaling test is quite severe and not reflective of field
performance. When this requirement is specified, do not include a
limit on SCM if the mixture has been evaluated for a quantity in
excess of the limit. No performance alternative is suggested for w/cm.

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

Sulfate Exposure
In accordance with ACI 318-14, select w/cm, compressive strength,
cementitious materials for the sulfate Exposure Classes S1, S2 and
S3. Note that concrete members subject to marine exposure are
assigned to exposure class S1. However, because of exposure to chlorides in seawater, the requirements of exposure class C2 for w/cm
and ƒ´c would govern. Do not permit calcium chloride admixtures
for S2 and S3 classes.

Performance Requirement
In accordance with ACI 318-14, as an alternative to cementitious
materials specify that the combinations of cementitious materials
proposed meet the ASTM C1012 expansion criteria. No performance
alternative is suggested for w/cm.

Water Exposure
In accordance with ACI 318-14, select w/cm, and compressive
strength for the water Exposure Class W1 where a low permeability
is required.
(ACI 318-14) Table 26.4.2.2(c) - Requirements for Establishing
Suitability of Combinations of Cementitious Materials Exposed to
Water-Soluble Sulfate

Exposure
Class

(1)

Maximum Expansion Strain if Tested
Using ASTM C1012
At 6 Months

At 12 Months

At 18 Months

S1

0.10 percent

No requirement

No requirement

S2

0.05 percent

0.10 percent(1)

No requirement

S3

No requirement

No requirement

0.10 percent

The 12-month expansion limit applies only if the measured expansion exceeds
the 6-month maximum expansion limit.

(1)

Max w/cm(1)

Min ƒ´c , psi

W0

N/A

2500

W1

0.50

4000

The maximum w/cm limits in Table 19.3.2.1 do not apply to
lightweight concrete.

Performance Requirement
An alternate to the w/cm is to specify a requirement for rapid chloride
permeability (RCP) measured in accordance with ASTM C1202. A
suggested alternative to the max w/cm of 0.50 is a maximum RCP of
2500 coulombs. Do not include both w/cm and RCP requirements.
RCP is performed when pre-qualifying the mixture and documented
in a submittal.
For some types of structural members where cracking impacts
functionality (e.g. water retaining structures), shrinkage requirements
may be considered. Specify a length change limit of 0.05% tested in
accordance with ASTM C157. General specimen conditioning for this
limit is curing for seven days in water followed by drying for 28 days -
test age is 35 days. Compliance with this requirement is done during
pre-qualification and documented in a submittal.

Corrosion Protection of Reinforcement
In accordance with ACI 318-14, select w/cm compressive strength.
Specify chloride limits for concrete mixtures. Specify cover to reinforcing steel for members assigned to exposure class C2.

Performance Requirement
An alternate to the w/cm is to specify a requirement for RCP measured
in accordance with ASTM C1202. A suggested alternative to the max
w/cm of 0.40 is a maximum RCP of 1000 coulombs. Do not include
both w/cm and RCP requirements. RCP tests are performed during
mixture prequalification and documented in a submittal. The RCP
requirement features as an effective performance alternative to specifying types and quantities of SCM. The RCP and strength requirements
ensure that concrete mixtures that are resistant to chloride penetration
concrete INFOCUS

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41



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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