Concrete inFocus - Spring 2017 - 38

prescriptive and performance requirements for
the same item are generally more problematic.
Examples would be a maximum water-tocementitious materials ratio (w/cm) and/or a

minimum cement content that is not consistent with the specified compressive strength.
In the evolution of ACI standards for
concrete, ACI Committee 318 established

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clear durability provisions for concrete
in 2008 and published a reorganized
Building Code Requirements for Structural
Concrete in 2014. ACI 318-14 includes a
new Chapter 26 that addresses the coderelated requirements that need to be
addressed by the engineer in the specification. ACI Committee 301 develops its
specification through a consensus-based
process by addressing the opinion of various entities that would be involved in a
concrete project. ACI 301 incorporated
the ACI 318 durability requirements in
2010 and recently published ACI 301-16,
Specifications for Structural Concrete, with
additional improvements that are specific
to the application. The committee is working on ensuring that provisions of Chapter
26 of ACI 318 are incorporated in ACI 301.
While ACI 301 includes some prescriptive
provisions, the document is evolving to a
performance-based specification. It, however, avoids prescriptive and performance
inconsistencies for the same item within
the specification. Prescriptive requirements
exist until such time performance alternatives can be developed. ACI Committee
329 has published a report of performancebased requirements for concrete materials
and is working to develop a guide to writing
a performance specification.
While most specifications reference ACI
301 as a general statement, design offices use
the AIA MasterSpec as the starting point for
their office master specifications. The current licensed version of Section 033000 of
MasterSpec for cast-in-place concrete does
not include durability requirements of ACI
318-08 and is not current relative to ACI 318
and ACI 301. The details covered in ACI 301
are thereby not reflected in these specifications
that are used on projects. It is important for
design engineers responsible for specifications
to review the current version of the ACI standards and update their specifications to be
current with industry standards. NRMCA has
posted some guide specifications with detailed
notes to the A/E to support these changes. Visit
www.nrmca.org/p2p.
The goal of a specification is to ensure
that requirements are achievable, without
conflicts, and are clearly stated, such that
any requirement is interpreted the same way
by anyone reading the specification. The
task is challenging but necessary to improve
the reliability and growth of concrete construction.
■

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

From the President’s Desk
Corporate Suite Column
Enviroscene Column
Strong and Efficient: Insulating Concrete Forms for Multifamily Residential Construction
Cut the Cost of Workers’ Compensation Insurance in the Concrete Industry
Engineering: Specifications for Concrete Construction
Predicting the Potential for Plastic Shrinkage Cracks
2017 Product Preview
Index of Advertisers
Concrete inFocus - Spring 2017 - belly1
Concrete inFocus - Spring 2017 - belly2
Concrete inFocus - Spring 2017 - cover1
Concrete inFocus - Spring 2017 - cover2
Concrete inFocus - Spring 2017 - 3
Concrete inFocus - Spring 2017 - 4
Concrete inFocus - Spring 2017 - 5
Concrete inFocus - Spring 2017 - 6
Concrete inFocus - Spring 2017 - 7
Concrete inFocus - Spring 2017 - 8
Concrete inFocus - Spring 2017 - 9
Concrete inFocus - Spring 2017 - 10
Concrete inFocus - Spring 2017 - From the President’s Desk
Concrete inFocus - Spring 2017 - 12
Concrete inFocus - Spring 2017 - Corporate Suite Column
Concrete inFocus - Spring 2017 - 14
Concrete inFocus - Spring 2017 - 15
Concrete inFocus - Spring 2017 - Enviroscene Column
Concrete inFocus - Spring 2017 - 17
Concrete inFocus - Spring 2017 - Strong and Efficient: Insulating Concrete Forms for Multifamily Residential Construction
Concrete inFocus - Spring 2017 - 19
Concrete inFocus - Spring 2017 - 20
Concrete inFocus - Spring 2017 - 21
Concrete inFocus - Spring 2017 - 22
Concrete inFocus - Spring 2017 - 23
Concrete inFocus - Spring 2017 - 24
Concrete inFocus - Spring 2017 - 25
Concrete inFocus - Spring 2017 - 26
Concrete inFocus - Spring 2017 - 27
Concrete inFocus - Spring 2017 - 28
Concrete inFocus - Spring 2017 - 29
Concrete inFocus - Spring 2017 - 30
Concrete inFocus - Spring 2017 - Cut the Cost of Workers’ Compensation Insurance in the Concrete Industry
Concrete inFocus - Spring 2017 - 32
Concrete inFocus - Spring 2017 - 33
Concrete inFocus - Spring 2017 - 34
Concrete inFocus - Spring 2017 - 35
Concrete inFocus - Spring 2017 - 36
Concrete inFocus - Spring 2017 - Engineering: Specifications for Concrete Construction
Concrete inFocus - Spring 2017 - 38
Concrete inFocus - Spring 2017 - 39
Concrete inFocus - Spring 2017 - 40
Concrete inFocus - Spring 2017 - Predicting the Potential for Plastic Shrinkage Cracks
Concrete inFocus - Spring 2017 - 42
Concrete inFocus - Spring 2017 - 43
Concrete inFocus - Spring 2017 - 44
Concrete inFocus - Spring 2017 - 45
Concrete inFocus - Spring 2017 - 2017 Product Preview
Concrete inFocus - Spring 2017 - 47
Concrete inFocus - Spring 2017 - 48
Concrete inFocus - Spring 2017 - 49
Concrete inFocus - Spring 2017 - 50
Concrete inFocus - Spring 2017 - 51
Concrete inFocus - Spring 2017 - 52
Concrete inFocus - Spring 2017 - 53
Concrete inFocus - Spring 2017 - Index of Advertisers
Concrete inFocus - Spring 2017 - cover3
Concrete inFocus - Spring 2017 - cover4
Concrete inFocus - Spring 2017 - divider1
Concrete inFocus - Spring 2017 - divider2
Concrete inFocus - Spring 2017 - 57
Concrete inFocus - Spring 2017 - 58
Concrete inFocus - Spring 2017 - 59
Concrete inFocus - Spring 2017 - 60
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