Category: Construction & Civil

Developments in Roadstone’s Thermal Liteblock – Irish Building magazine

Part L, Liteblock

The following article first appeared in the Irish Building magazine and can be downloaded HERE

Award Winning Thermal Liteblock

Alan Lowe, Roadstone’s Senior Technical Manager discusses the new developments regarding Roadstone Thermal Liteblock, their large range of thermally modeled construction details and the features and benefits of the Thermal Liteblock which is available from Roadstone outlets nationwide.

Roadstone’s multi-award winning Thermal Liteblock is manufactured by Roadstone in Ireland. Thermal Liteblock is used at key junctions to provide reductions in thermal bridging and heat loss. It has thermal conductivity values less than 0.33 W/mK which is a 300% improvement over standard concrete blocks. This is achieved using a specific mix design which includes lightweight aggregates. This mix produces a robust concrete block with excellent insulation properties while maintaining structural strength and allowing for traditional construction methods to be used. Thermal Liteblock can be used with traditional mortars and renders and is compatible with standard concrete fixings.

By 2016 Thermal Liteblock was established in the market, winning national awards. Speaking to Irish building magazine, Alan says Thermal Liteblock has proved to be a very successful product, being specified by designers on a wide range of domestic, commercial and public projects. He describes Roadstone’s most recent addition to the Thermal Liteblock range, developing a higher strength Thermal Liteblock: “We have recently developed a 13N/mm² Thermal Liteblock. The building regulation minimum standard is 7.5 N/mm² for the compressive strength of standard and lightweight concrete blocks. The 13 N/mm² Thermal Liteblock is suitable where higher design strength is required, such as in commercial developments where compliance with NZEB (Near Zero-Energy Buildings) is required. Thermal Liteblock is now available in a range of strengths, sizes and configurations providing far greater design and construction flexibility for our customers.”

The Roadstone Thermal Liteblock system combines the Roadstone Thermal Liteblock with the Roadstone Concrete Block range, which when used in accordance with the Acceptable Construction Details (ACDs), achieves Psi values equal to or better than the standards set out in TGD Part L 2011. Roadstone have thermally modelled all relevant details in Appendix D of TGD L 2011. From this extensive research, Roadstone are now in a position to provide detail solutions that comply fully with Psi value requirements outlined in TGD L 2011 – Appendix D. Roadstone also offers a specialist design service. Alan explains, “If a client comes to us with a project at the design stage or with bespoke details we can engage our design consultants Evolusion Innovation to carry out fully certified y value calculations for the project. From this, we can assist our customers in identifying cost savings and/or enhanced Building Energy Rating (BER) performance. We have over 150 certified thermally modelled details that are available to our customers for incorporation into their projects.”

“We were able to achieve a thermally efficient block and one which meets the robustness, integrity and strength that is required by the Irish and European standards.”

Alan describes how the Thermal Liteblock was originally developed. “Roadstone recognised back in 2013 that Part L of the building regulations had changed the thermal bridging requirements for construction details. We reviewed the Psi value requirements in Part L and examined how we could achieve a more thermally efficient concrete block to achieve compliance. We completed 12 months of Research & Development to manufacture a concrete block with low density and improved thermal performance while maintaining the required structural characteristics of a concrete block.” Speaking of their success, he says, “We were able to achieve a thermally efficient block and one which meets the robustness, integrity and strength that is required by the Irish and European standards.”

Key features and benefits:

  • Reduced Thermal Bridging resulting in reduced heat loss, and lower heating bills.
  • Excellent thermal conductivity (Lambda λ) value less than 0.33 W/mK for masonry block.
  • Robust and durable concrete block with a minimum compressive strength of 7.5N/mm².
  • Suits traditional construction methods familiar to Irish and UK designers and builders.
  • CE marked – manufactured to the requirements of I.S. EN 771-3 to System 2+.
  • Thermal Liteblock is required only in key locations in conjunction with the Roadstone Concrete Block range.
  • The Roadstone Thermal Liteblock system is a very cost effective solution and can result in significant savings in the overall build cost.
  • Improved (y) value calculations are achieved when using the Roadstone Thermal Liteblock system.
  • When a full building specific (y) value calculation is carried out using the Psi Values incorporating the Roadstone Thermal Liteblock, improved (y) value of between 0.03 and 0.06 can typically be achieved.
  • Compliant U-values are achieved without having to provide a cavity in excess of 150mm.
  • Roadstone Thermal Liteblock is unique in colour to enable traceability on site.
  • Photographic recording of the Thermal Liteblock built on site can then form evidence of compliance for the Assigned Certifier, Architects, Engineers and BER assessors.

Thermal Liteblock’s 2016 Awards:

Winner Best Interior Building Product – RIAI Architecture Choice Awards
Winner Best New Product Innovation – Irish Build & Design Awards
Winner Construction Product of the Year – Irish Construction Industry Awards

 

N17 N18 Gort To Tuam PPP Scheme

The N17 N18 Gort To Tuam PPP Scheme was separated into 3 sections, North, Middle and South.

Roadstone is delighted to see the opening of the new M17/M18, having supplied and laid 1 Million squared metres of blacktop to the job over the last 2 years.

Roadstone won the contract to lay CBGM, Base, Binder and Wearing Course on both the North and Middle sections including all side roads on the Tuam By-Pass and Rathmorrissy interchange.

Highlights

Rathmorrissy Interchange is the largest on the contract linking M6 Galway to Dublin motorway and M17/M18 Gort to Tuam motorway. The roundabout itself is almost 1 km in circumference and was a very complicated and challenging aspect to the contract.

Annagh Hill interchange is located at Annagh hill on N63. The interchange consists  4 roundabouts and approximately 4km of a road network.

 

Safe T Certification award

In November 2016 Roadstone Contracts was awarded the highest Safe T rating possible. The audit was carried out on this project, and is a testament to the team working on the project.

 

Contract in Numbers

Official opening Date                                      27th September 2017 (5 months early)

Contract duration                                            2 years

Locations

Tuam By-Pass                                                   4.1km

N17/N18 mainline                                           30km

Rathmorrissy circulatory carriageway        1km

Rathmorrissy slip roads (12no.)                    9km

Annagh Hill Interchange                                4 roundabouts including 4km road network

Side Roads                                                         25

 

Takeaways

  • Communication is key
  • Advanced planning and programming is vital
  • Dealing with issues quickly and effectively builds confidence
  • Quality and quality control are a key part of any large contract

 

Roadstone Thermal Liteblock- Building Energy Efficiency

Thermal Liteblock Logo

Roadstone has launched a new Thermal Liteblock system. The Roadstone Thermal Liteblock is a lightweight, durable and thermally efficient concrete block that provides improved energy efficiency in the design and construction of new buildings, and combined with a program of thermal modelling provides customers with solutions for compliance with the recently revised building regulations. There is now a greatly increased emphasis on minimising heat loss in the fabric of new buildings and particularly thermal bridging that can occur at building junctions. Roadstone’s product development included thermal modelling of a wide range of these building junctions which means that we can provide customers with design solutions and validated thermal performance calculations, through our technical support team. Roadstone’s product launch program included a number of regional seminars throughout Ireland that were well attended by architects, BER assessors, engineers and building contractors.

Roadstone has thermally modelled each critical junction detail, ACD’s as listed in TGD L 2011 appendix D1, D2, D4 and D6 and has calculated the psi value for each junction. This means we can provide a certified (y) factor calculation to our customers when using the Roadstone Thermal Liteblock system and the improved benefits of this will be evident in the improved BER results for your building. By using the Roadstone Thermal Liteblock System you can comfortably comply with TGD Part L 2011 thermal bridging requirements.

Roadstone has now developed a designated web page for Thermal Liteblock that includes the product brochure, contact details for our technical support team and a wide range of details that are now available for download. These details are fully certified and have been thermally modelled by our NSAI certified energy consultants Evolusion Innovation, to demonstrate compliance with TGD Part L.

Please contact one of our technical support team to discuss CPD accredited Liteblock seminars that can be provided in your practice or to discuss design solutions for your project.

If you are interested in taking part in one of our regional CPD seminars please fill out the CPD seminar enquiry form by clicking here.

 

Did You Know? – Concrete Blocks

concrete-blocks2

The minimum strength for the use of solid masonry units (Dense and Lightweight) in Ireland is 7.5N/mm² in line with the Current building regulations Technical Guidance Documents part A – Please refer to Clause 1.1.3.5

Concrete block strength descriptions have been updated in line with IS EN 771-3. The relevant testing method is now mortar capped and dry tested. Block strength descriptions are now displayed as follows:

Solids:

Old New
5N 7.5N
10N 13N
15N 18N
20N 24N
30N 36N
Hollows:

Old New
3N 4.5N
10N 13N
15N 18N
20N 24N

Standards Required to Build a Concrete Masonry Wall in Ireland

  • Produced to:
    I.S. EN 771-3 – 2011 Aggregate Concrete Masonry Units (Dense and Lightweight)
  • Level of conformity:
    CE Level 2+ Externally certified by a notified body (i.e. NSAI)
  • Intended use:
    As common, facing or exposed masonry in load bearing or non-load bearing building and civil engineering applications when designed and built in accordance with the current Irish Building Regulations

    • TGD Part A Structure
    • TGD Part B Fire Safety: class A1
    • TGD Part E Sound: Density >1900kgs
    • Part L Energy: Roadstone Thermal Liteblock reduce the thermal bridging at key junctions & air leakage
  • Designed to: Eurocode 6
    • I.S. EN 1996-1-1 General rules for reinforced and unreinforced masonry structures + National Annex
    • I.S. EN 1996-1-2 General rules. Structural fire design + National Annex
    • I.S. EN 1996-2:2006 Design considerations, selection of materials and execution of masonry + National Annex
  • Exposure/Durability tables and recommended Details:
    S.R. 325: 2014 Recommendations for the design of Masonry structures in Ireland to Eurocode 6.
  • Mortars and  Plasterers:
    I.S. EN 998-1 Specification for mortar for masonry – Part1: Rendering and plastering Mortar
    I.S. EN 998-1 Specification for mortar for masonry – Part2: Masonry Mortar
  • Rendering and Plastering:
    I.S. EN 13914: 2005 Pt. 1- Design preparation and application of external rendering and internal plastering – External Rendering
    I.S. EN 13914: 2005 Pt. 2- Design preparation and application of external rendering and internal plastering – Internal Plastering
  • Materials:
    • Cement: I.S. EN 197-1 : 2011
    • Aggregates: I.S. EN 12620 & SR 16 Guidance on the use of I.S. EN 12620 Aggregates for Concrete
    • Sands: I.S. EN13139 & SR 18 Guidance on the use of I.S. EN 13139 Aggregates for Mortar
    • Admixtures: I.S. EN 934-2
    • Water: I.S. EN 2008 Mixing water for concrete
  • Ancillary components:
    • I.S. EN 845-1 Specification for ancillary components for masonry –Part 1: Ties, tension straps hangers and brackets
    • I.S. EN 845-2 Specification for ancillary components for masonry –Part 2: Lintels
    • I.S. EN 845-3 Specification for ancillary components for masonry –Part 3: Bed Joint Reinforcement of steel meshwork

S.R. = Standard Recommendation for the use of standards in Ireland prepared under the direction of the NSAI (National Standards Authority Ireland)

I.S. EN 206: 2013 Concrete Specification

I.S. EN 206: 2013 – Concrete Specification, Performance, Production and Conformity, is the current Irish standard for the specification and
production of concrete and should be used in conjunction with the Irish National Annex I.S. EN206:2013/NA:2015.

Click on this link to download an easy-to-use introductory guide to understanding and interpreting the new standard, courtesy of Roadstone, the standard-bearers for excellence in concrete production.

Notable changes to the standard include revised requirements for fibre reinforced concrete, recycled aggregates and additions (fly ash & GGBS).
The requirements for conformity assessment have also been revised including additional requirements for Self Compacting Concrete and concrete for geotechnical works. The National annex takes these changes into account for Irish conditions with reduced cement contents for some exposure classes, reduced the slump tolerances and increased the strength class for Freeze Thaw.
Alternative equivalent design mixes can now be supplied in place of standard prescribed mixes, if supplied from third party accredited, I.S. EN 206:2013, ready mix concrete producer. See Table NB.2: Alternative Equivalent Design Mixes.
The National Annex also provides specific additional information and responsibilities for the specifier, user and producers in Ireland. Refer to I.S. EN 206 :2013: Tables NA5, NA6 & NA77 (table NC1 to NC6 where the design life & cover are known). The format for specifying and ordering concrete remains the same as that previously specified in I.S. EN206-1: 2002 including compressive strength, consistence and exposure classes.

If you have any questions on concrete specifications or require further technical information on any Roadstone products please contact us via this quick contact form and we’ll gladly assist with your query.

Alternatively please browse our complete concrete range of products by clicking on the following Roadstone website link:

Roadstone Concrete Range

Roadstone wins prestigious award

Roadstone, the leading manufacturer and supplier of building materials in Ireland, is celebrating after their Thermal Liteblock picked up the award for ‘Best New Product Innovation of the Year’ at the recent Irish Building and Design Awards.

 

Organised and hosted by leading event organisers CMG, the black tie ceremony was held in the Ballsbridge Hotel, Dublin. Over 500 Professionals from architecture, engineering, construction and design attended the industry’s blue ribbon event to celebrate the nation’s best building and design projects over the past 12 months.

The judging panel for the 2016 ceremony included some of the leading industry professionals such as Martin Lang, CIF Director of Main Contracting and Tim Brick, Executive Director of the Irish Academy of Engineering. This year’s awards received the largest number of submissions since the event’s inception six years ago with each judge commenting on the high standard.
Roadstone led the way in the ‘Best New Product Innovation of the Year’ category for its innovative Thermal Liteblock.

Arthur Lambert - Alan Lowe - Michael Toomey

Arthur Lambert – Alan Lowe – Michael Toomey from Roadstone receiving the award

Thermal Liteblock is a lightweight, durable and thermally efficient concrete block that provides improved energy efficiency in the design and construction of new buildings. The product was developed to meet new building regulations in particular Part L. Launched in May 2015 it includes thermal modelling of a wide range of building junctions which means that we can provide our customers with design solutions and validated thermal performance calculations, through the Roadstone technical support team.

The Thermal Liteblock product launch program included a number of regional seminars throughout Ireland that were well attended by architects, BER assessors, engineers and building contractors. A designated page has been developed on the Roadstone website for Thermal Liteblock that includes technical guidance, DOP and  contact details for our technical support team as well as a large range of technical drawings available to download in various formats.

New Huntstown Brick range launched

Huntstown Brick

Roadstone recently launched its NEW range of Huntstown Brick at the National Ploughing championships in Ratheniska. With over 200,000 attendees this event was a huge success.

Huntstown new brick range offers a unique range of colours and textures, providing stylish, durable and innovative building solutions to designers, contractors and house builders alike.

There are four new colours added to our range, Red Multi, Golden Multi, Georgian Blend and Harvest Blend available in smooth or antiqued rumbled ranges.

A significant investment in product development coupled with our own technical expertise and innovation has added a new dynamic to our programme of product development.

Huntstown brick is also colour and texture compatible with the full Forticrete range of facing masonry specials including quoins, sills, splayed and coping units.

Roadstone have a network of Retail Outlets and display areas throughout the country where you can view and collect samples of Huntstown brick.

Did You Know? – Mortar

Roadstone - Do you know mortar?

The current standard for mortar is I.S. EN 998-1 :2012  Specification for mortar for masonry.

The sand used to produce mortar should comply with the requirement of SR 18, Guidance on the use of I.S. EN13139:2002 – Aggregates for mortar. The SR gives the NPD’s (National defined parameters) for the PSD (particle size distribution) and chemical requirements of the sands used to produce mortar.

Mortar strength is now specified as a compressive strength class  i.e. M6, the number following the M is the compressive strength for the class at 28days in N/mm²

Table NA.3 below is taken from the Irish National Annex to Eurocode 6 – Design of masonry structures – Part 1-1: General rules for reinforced and unreinforced masonry structures

The table gives new compressive strength class, proportions and the old Mortar designation.

roadstone-mortar

Mortar is available from Roadstone as TRM ( trowel ready mortar) or Flowmix  (dry silo mortar)

Technical Certification & Declaration of Performance (DOP) are available to download – just click here.

ISO 50001 Ireland Conference

Kevin Donovan at the ISO50001 Ireland conference 2015

ISO50001 Ireland 2015 on the 20th of May in Croke Park saw the event celebrate it’s 3rd anniversary. The event brought together delegates from Irish processing who are considering the transition to the International energy management standard ISO 50001, but yet to make the journey. The theme/profile of the event is simply to create an exchange of information between organisations who are about to make the transition to the Energy Management Standard ISO 50001 and companies who have already made the transition. Speakers were carefully selected based on their experiences and knowledge of this standard and who are keen to network with delegates in an effort to develop the standard further within Ireland.

This year saw a collection of presentations from a broad selection of industry sectors, including Food, Pharmaceutical, Medtech, ICT, Transport and representing the Construction sector was our own Kevin Donovan from Roadstone Ireland.

Kevin had the opportunity to share with over 200 of his peers from Irish industry the achievements of Roadstone Ltd to date in adopting the ISO 50001 energy efficiency standard. Now boasting 21 Locations, and Transport Sector the strategy is to continue accreditation of ISO 50001 across the group. Kevin says; “It was an excellent opportunity for me and Roadstone to highlight the significant developments we have achieved in energy efficiency in recent years. It is a credit to the entire Energy/Facility Teams, as well as Senior Management who without their support these accreditations would not be possible.”

Kevin’s full presentation  can be accessed on the event website www.iso50001ireland.ie using   the  password: “iso2015”.

New Thermal Liteblock System – A fabric first approach for compliance with Part L of Building Regulations

Launch of Roadtone Thermal Lite Block

 

Roadstone Ltd is proud to introduce the Thermal Liteblock System, an exciting new product innovation which was launched recently at an event in Dublin.

The Roadstone Thermal Liteblock is a robust and durable, lightweight block which was developed for use with traditional masonry after extensive research aimed at producing a cost-effective solution for architects, engineers, assigned certifiers and building contractors to comply with Part L of the Building Regulations.

When used in conjunction with Roadstone’s standard Concrete Block range, the system improves thermal conductivity by an impressive 300%.  The mitigation of heat loss at thermal bridges, which is a key challenge in the construction industry, also results in reduced energy bills.

The Roadstone Thermal Liteblock is made from a special mix which includes lightweight aggregrates to achieve conductivity values of 0.33W/mK.  It is manufactured in Ireland and has an average weight of just 11.5kg compared to the standard 20kg concrete block.  Heather in colour to facilitate traceability on site, the Roadstone Thermal Liteblock is also CE marked 2+.

The Thermal Liteblock is used at targeted key locations in conjunction with the Roadstone Concrete Block range, providing a cost effective solution to the construction of new buildings and allowing greater flexibility in the development of designs.

Speaking at the launch event in City Hall Dublin, guest of honour Mr. Tom Parlon, Director General of the Construction Industry Federation said, “Energy efficiency remains the best way to offset energy costs and reduce the carbon emissions of new buildings.  For these reasons, improved energy efficiency standards in new residential, business and public developments are at the core of the new Building Regulations and the Government’s Construction 2020 Strategy.  I welcome this product innovation from Roadstone and the contribution it will make towards achieving these standards.”

 

Tom Parlon, Director General of the Construction Industry Federation and Larry Byrne, Managing Director of Roadstone Ltd pictured at the launch of Roadstone’s Thermal Liteblock System

Tom Parlon, Director General of the Construction Industry Federation and Larry Byrne, Managing Director of Roadstone Ltd pictured at the launch of Roadstone’s Thermal Liteblock System

Mr. Larry Byrne, Managing Director of Roadstone Ltd added, “Roadstone continually strives to produce only the highest quality products and to give the best service in our industry. In this regard, we are committed to product innovation aimed at meeting national energy efficiency standards. The Thermal Liteblock System is an innovative, cost-effective and Irish-made product, designed for the needs of the Irish construction industry. We are confident that it will play a major role in the industry for many years to come.”

 

Alan Lowe, Product Development Manager, Roadstone Ltd pictured at the launch of Roadstone’s Thermal Liteblock System

Alan Lowe, Product Development Manager, Roadstone Ltd pictured at the launch of Roadstone’s Thermal Liteblock System

Over 100 industry experts attended the official launch of the Thermal Liteblock System, which included a technical Questions and Answers session on its role in Irish construction.

Thermal Liteblock FAQ’s

Irish Wind Energy Output Reaches Record Heights

Irish wind energy output reached a record high on of 1,942MW on Wednesday. 

The output is enough to power over 1.26 million Irish homes according to figures published by EirGrid, who monitor electricity generation and usage nationally.

The new record is the second such record to be established already in 2015 and overtakes the previous record set on New Years Day of 1,872MW.

Since the start of the year, Irish wind energy has met a third (33%) of all Irish electricity demand from Irish consumers and with high winds forecast beyond the coming weekend, this trend is set to continue.

Roadstone are playing an important part in building on this cleaner, sustainable solution to Ireland’s energy problems. Material supplied by Roadstone includes stone fill for access roads and high strength concrete required for turbine bases and grid networks.

A turbine base can require between 400-800m3 of concrete all supplied in a single pour.

Pictures attached are of one such project – The Garracummer Wind Farm in Co. Tipperary, which went into operation two years ago.  Roadstone supplied the concrete for this project. Due to the national network of concrete plants and quarry locations, Roadstone are ideally located to successfully service similar projects well into the future.

Revision of S.R.21

In March of this year the NSAI published the revised draft of S.R. 21. The Standard Recommendation’s full title is,

S.R.21: Guidance on the use of I.S. EN 13242:2013 – Aggregates for unbound and hydraulically bound materials for use in civil engineering work and road construction.

Annex E deals specifically with aggregates for use under (and adjacent to) concrete floors and footpaths.
We are happy to confirm that all relevant Roadstone Ltd locations have been inspected and tested and found to be in full compliance with S.R 21, and all other S.R’s such as
S.R 16 Aggregates for concrete
S.R 17 Aggregates for Bituminous Mixtures and Surface Treatments
S.R 18 Aggregates for Mortar

 

 

Background:

In 2007, Annex E was added to SR21 in response to concerns about pyritic materials having entered the supply chain from a small limited number of suppliers and resulting in structural damage to a significant number of houses and buildings in the Greater Dublin region. This further revision is substantially on foot of the Pyrite Panel Report 2012 issued by the Department of the Environment, Community and Local Government following an enquiry into the matter.

Annex E Proposed Specifications

1. Material Properties :

(a) Grading, material now to be a continuously graded 0/31.5 mm as per Table E.2 of S.R 21 Annex E.

(b) Durability:
LA value now required to be a maximum of LA30
Mudrock content of the material shall not exceed 10%
Magnesium Sulphate Soundness value shall comply with MS25

(c) Chemical Requirements:
Total Sulphur;
If <0.1% no Petrography necessary
If between 0.1% and 1% Petrography necessary
If Pyrrhotite present 0.4% Total Sulphur max
If Total Sulphur is > 1% material is unsuitable.

2. Geological and Petrographic Assessment :
More explicit guidance is given on the geological and petrographic assessment to limit the risk of swelling due to the presence of a reactive form of pyrite.

3. Factory Production Control :
Previous specifications generally called for chemical and physical testing of materials on a yearly or bi-yearly basis. This has been increased to the levels contained in Table E.1.

The main changes are:
Grading: Weekly
% Crushed Particles (Gravel only): Monthly
LA 2/Year
Water Absorption: 2/Year
Soundness: 1/Year
Total Sulphur: Quarterly
Acid Soluble Sulphate: Quarterly
Geological Description Quarterly

Please note that these test frequencies only apply during times of production. A period of production is defined as a full week, month or year.
These test frequencies may be reviewed based on the advice of a Professional Geologist.

4. System of Attestation and Verification :
The system of attestation and verification of performance has changed from System 4 (self-certification) to System 2+ (independent certification) for this particular end use aggregate. There is an 18 month lead in time to allow certain producers to ensure all Quality Management Systems are in place prior to external audit.

5. Documentation :
The full title, “Granular Fill to Annex E of S.R. 21”, of this special end use aggregate should be clearly stated on the Declaration of Performance, and other documentation including the delivery ticket.

6. Future Proposal :
NSAI Aggregates Panel is now tasked with generating a Code of Practice for the use of hardcore which will include supply chain control arrangements.

 

Roadstone Ltd have a long and successful history of supplying a wide range of building materials to the Irish construction industry with no issues relating to pyritic heave or swelling.

Leixlip Waste Treatment Facility

In 2014, Roadstone were tasked with supplying a single pour of 1,700m3 of C30/37 D20 S3 ready mixed concrete to the Lower Liffey Valley Sewerage Scheme Wastewater Treatment Plant Upgrade in Co. Kildare. The scheme aims to upgrade the existing Leixlip WWTP from 80,000 population equivalent to its ultimate capacity of 150,000. The 1,700m3 concrete single pour required considerable planning by Roadstone in terms of manufacture, transport and technical support. The 13 hour pour was closely monitored by Roadstone technical staff at the two supply plants and also during placement of the concrete on site. Three concrete pumps were utilised to ensure a constant rate of pour was delivered. The traffic management, continuity and consistency of concrete supplied were key to the success of the project.

N7 Newlands Cross Free Flow Interchange

Roadstone are currently supplying material to the N7 Newlands Cross Free Flow Interchange upgrade which consisted of major road widening and improvement to the busiest road junction in Ireland. This massive project mainly consists of the construction of a major re-enforced earth bridge 10 meters in height. Over 180,000 tns of 6I granular fill will be used in the construction of the ramps adjacent to the bridge abutments. This material will be placed in 150mm layers and compacted to in excess of 95% of maximum dry density.

Large concrete panels are used to face the side walls of the bridge with pre-cast natural cut-stone effect panels used to face the ramps. These panels are held in place by means of galvanised straps connected to the internal face of the panel at depths of 150mm.

This 6I material will then be covered with a layer of 6F2 and 150mm of Cl 804 before being covered in bituminous base layer. 6N is also used as backfill to the bridge piers

This project also involves the construction of numerous additional and auxiliary traffic lanes. When completed, the work will resulted in a significant improvement to the route capacity and traffic flow at this strategic junction with minimal disruption to existing traffic flow, adjacent residences and commercial enterprises during construction. As a major supplier Roadstone are contributing to the success of this project with their unrivalled experience and commitment to quality and service.