Masterspec
13 Sep 2021
THE HISTORY OF MASTERSPEC
Construction Information Limited (CIL) is a New Zealand owned and operated industry organisation incorporated in 1995 to manage and create information...
09 Sep 2021
THE BEST WAY TO COLLABORATE THROUGH MASTERSPEC
There’s nothing quite like the peace of mind of a professional, well-thought-out specification. Build quality specifications in Masterspec with...
31 Aug 2021
SPECIFYING SCNZ STRUCTURAL STEEL ON MASTERSPEC
Structural Steel New Zealand (SCNZ) has had a Structural Steel specification document based on AS/NZS 5131 since 2018. However, a new industry...
04 Aug 2021
PURLINS & GIRTS MOVING DAY
Masterspec existing branded Purlin and Girt sections are on the move, but not far. For a long time they have not quite been in the right CBI number,...
04 Aug 2021
CONCRETE TERMINOLOGY & TYPES
With three new branded sections relating to concrete, we have provided a brief overview article describing common concrete terminology and related...
03 Aug 2021
MONTHLY PRODUCT PARTNER EVENTS AT MASTERSPEC
Partner Manager Trish Croot is excited to introduce a brand new, monthly networking opportunity to Masterspec Partners. Join us at the Masterspec head...
03 Aug 2021
mDOCS, BE A PART OF GROWING TECHNICAL RESOURCES FOR THE INDUSTRY
mDocs technical library is a free resource within your subscription that will help ensure the entire specifying community has the right documents, at...
03 Aug 2021
WHY INCLUDE THE WARRANTY AGREEMENT FORM?
The Masterspec section 1237WA WARRANTY AGREEMENT is a blank, standard form of a warranty agreement, available in all Masterspec systems except Minor...
02 Aug 2021
MASTERSPEC'S HELPDESK FOR SPECIFIERS AND PARTNERS
Are you a designer that’s creating a specification and have a quick question? Or maybe you are a Masterspec Partner and need some direction on where...
20 Jul 2021
NEW PRODUCT PARTNER SECTIONS FOR JULY 2021
In case you missed our Masterspec NOTES at the beginning of the month, here is a list with reference links for the new work sections published for...
29 Jun 2021
NEW GENERIC WORK SECTION - 5517 BENCHTOPS
Masterspec are happy to announce a new generic section, 5517 Benchtops, that encompasses the specification of a broad range of benchtops across...
29 Jun 2021
2391 RE-LEVELLING FOUNDATIONS & FLOORS - A NEW GENERIC SECTION
This new Masterspec section 2391 RE-LEVELLING FOUNDATIONS & FLOORS relates to the repair and re-levelling of existing foundations and floors of small...
03 Jun 2021
HOW MUCH DOES MASTERSPEC COST?
With seven different libraries to choose from, Masterspec has all you need to create a quality, New Zealand construction specification for any design....
11 May 2021
NEW PRODUCT PARTNER SECTIONS FOR MAY 2021
In case you missed our Masterspec NOTES at the beginning of the month, here is a list with reference links for the new Product Partner work sections...
29 Apr 2021
BUILDING CODE UPDATES 2020-2021 - INTERNAL MOISTURE
On the 4th November 2021, the changes to NZBC E3/AS1 and the addition of E3/AS2 become the Acceptable Solutions for Internal Moisture. But it is...
29 Apr 2021
LIST OF WORK SECTIONS WITH NZBC CHANGES - MAY 2021
With the updating of the Masterspec libraries, we thought it may be useful to provide the complete list of work sections that have been updated so you...
28 Apr 2021
BUILDING CODE UPDATES 2020-2021 - TIME TO ABSORB & APPLY
On the 3rd of November 2021, the 12 month transition period ends for the NZBC changes introduced in November 2020. This means the previous editions of...
28 Apr 2021
PROTECTION FROM FIRE UPDATES
This article delivers a summary of a number of the more significant updates to C/VM2 and C/AS2. Minor amendments to C/VM1 and C/AS1 were also made,...
28 Apr 2021
STORMWATER DRAINAGE DESIGN – NEW OPPORTUNITIES IN NZBC E1 NOVEMBER 2020 UPDATE
November 2020 brought a number of updates to the Building Code, including a new Acceptable Solution in the form of E1/AS2 in its newest version,...
25 Mar 2021
UPDATES TO MASTERSPEC INTUMESCENT PAINT – STEELWORK SECTIONS
Late last year the FPANZ (Fire Protection Association of New Zealand) released the Code of Practice COP-03 Version 1.0, Specification of Application...

CONCRETE TERMINOLOGY & TYPES

04 Aug 2021

With three new branded sections relating to concrete, we have provided a brief overview article describing common concrete terminology and related specification considerations as well as terminology relating to Firth's new concrete sections.

Ready-Mixed Concrete 

Ready-Mixed Concrete is produced at a batching plant which measures within permitted tolerances:
  • Portland cement, sand, aggregates by weight.
  • Water by weight or volume.
  • Admixtures (if used) by sight glass or pulse meter.
These materials are then mixed in a concrete mixer in the plant or in a truck mixer at the batching plant. Once mixing is complete the resulting Ready-Mixed Concrete is then delivered to site in a plastic state. This process of producing Ready-Mixed Concrete is used for the supply of Normal Concrete and Special Concrete. Prescribed Mix Concrete is not a Ready-Mixed Concrete as it is batched by volume not weight. 

Specification of Concrete

For the specification and manufacture of concrete NZS 3109 Concrete construction requires Normal Concrete, Special Concrete and Prescribed Mix Concrete in accordance with NZS 3104 Specification for Concrete production together with:
  • The specified compressive strength
  • Nominal maximum aggregate size. Close spacing of reinforcement may require a maximum aggregate size of less than 19mm.
  • Workability
  • Method of placement; and
  • Any additional properties or performance requirements required for Special Concrete.
Normal Concrete

Normal Concrete represents around 80% of concrete production and is used when the designers primary concern is specifying the compressive strength of concrete (by 28-day strength within a range from 17.5 to 50 MPa). The concrete producer assumes responsibility for mix designs and their properties as defined in NZS 3104.  

Special Concrete

Special Concrete refers to concrete where properties or performance requirements other than compressive strength within the Normal Concrete range (17.5 to 50 MPa) form the basis of the specification. For example: 
  • Concrete mixes over 50 MPa, or 
  • Where high early concrete strength is required, or
  • Where characteristic other than compressive strength forms the basis of the specification (e.g. shrinkage, tensile strength, chloride durability etc.), or
  • Where specific quantities of air entrainment are required.
The designer (or purchaser) is responsible for specifying the properties or performance requirements as well as testing and compliance tolerances of special concrete. The concrete producer is responsible for mix designs to meet these specified requirements.  

Discussion with the plant engineer (nominated by the concrete producer) may be required when specifying higher strengths as factors such as aggregate strength and shape can be an issue.  

Prescribed Mix Concrete

Prescribed Mix Concrete is limited to 10, 15, 17.5, 20, and 25 MPa nominal strengths at 28 days. Typical uses of prescribed concrete would be on small remote projects outside the operating areas of ready mixed concrete plants and therefore requiring site-mixed concrete production. Compliance is demonstrated by confirmation that specified mix portions (volume) detailed in NZS 3104 table 3 have been meet. 

Firth Certified Concrete®

Firth Certified Concrete® is a Ready-Mixed Concrete with embodied carbon (EC) rating representing a percentage reduction of Global Warming Potential relative to the Infrastructure Sustainability Council of Australasia Baseline. The higher the percentage rating the lower the Carbon footprint for any strength grade (17.5, 20, 25, 30, 35, 40, 45 & 50 MPa).

 EC10  10% reduction -Typically available at all Firth Plants*
 EC20  20% reduction - Typically available at all Firth Plants*
 EC30  30% reduction - Available at selected plants, check with Firth
 EC40  40% reduction - Available at selected plants, check with Firth
 EC50  50% reduction - Limited availability, check with Firth

* Check with Firth as some South Island plants may not have NZ manufactured cement available.

An Environmental Product Declaration (EPD) is a declaration of the past performance of common grades of Firth Certified Concrete® and is a standardised and verified way of quantifying the lifecycle environmental impacts of Firth Certified Concrete®. Firth's EPD is a "cradle-to-gate" type based on a consistent set of rules and is averaged over Firth's sites in New Zealand. It includes the environmental impacts associated with raw materials extraction and processing of inputs (cement, supplementary cementitious materials, aggregates, additives, and water), transport to, between and within the manufacturing site, and the manufacturing of the product up to the exit gate of the manufacturing site.

Firth can produce plant-specific and mix-specific environmental profiles on request, allowing consideration of three criteria (strength, cost & carbon performance). By contacting Firth Industries Limited through the Masterspec work section support function these services can be coordinated with the specification development process.

Preview the new Firth Sections

3101FC FIRTH LOW CARBON CONCRETE WORK – BASIC
3102FC FIRTH LOW CARBON CONCRETE WORK – STANDARD
3129FC FIRTH LOW CARBON CONCRETE PRODUCTION

 


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