Quarrying/Machinery

Aggregates' innovation: friend or foe? February 27 2015

Extracted from Aggregates Business Magazine : September/October 2014

“The aggregates’ industry typically has branded any crushed product that is less than 4 mesh (4.75mm) as ‘manufactured sand’. This of course is not the case. Manufactured sand should be a product that you have intentionally produced, not merely the waste fraction of a process that is targeting larger aggregate sizes.” 1

The produce sands from crushed rock, whether to replace ever-dwindling supplies of naturally occurring sands, or simply to reduce the huge amounts of unsaleable crushed rock fines generated in many quarries, there are several key characteristics with which we should be concerned. Those related to the suitability of the source rock, perhaps best loosely described as chemical properties, may be addressed by using admixtures in the concrete-making process, but, apart from the elimination of certain specific size ranges in which deleterious material may be concentrated, there is little the crushing and sizing process can do. Other factors, however, are well within the influence of existing process technology, and chief among these are particle size distribution, shape and surface texture.

The particle size distribution of manufactured sand is controlled by screening or sometimes by other methods of classification, the latter usually involving water, which brings its own problems. Until recently, this grading was usually governed to a great extent by the output of the crusher(s), and the breaking characteristics of the rock, but in the last few years, more interest has been shown in means of modifying the natural pattern of breakage, in particular to increase the sub-1mm particle population at the expense of coarser sizes, in order to improve packing density in concrete mixes.

The classification process has no effect upon either particle shape (or indeed on surface texture, as this is a property of the parent rock), so it is necessary to impose improvement with the use of suitable processing. Traditional rock crushers, whether compression (cone) type, or impact (blow-bar or hammer) type, can be made to produce adequate shape in coarse aggregates, but typically product below about 6mm (¼ inch) contains a high proportion of flaky or elongated particles, resulting in many of the problems inherent in using such material as a sand substitute. Grain shape is a function of the crushing process (and, of course, the natural cleavage and fracture characteristics of the parent rock). Suitable shape is generally described, unhelpfully, as cubical, the ultimate expression of which would be a shape enclosed by six identical square faces. In contrast, we should try to produce a shape that has good volume to surface area ratio, and an easily-packed form, to minimise the amount of binder we need to stick it together in the form of concrete. Given these attributes, it will automatically tend to assist workability, unlike our cube! The ideal form can perhaps be described as equally dimensional, and without sharp corners or edges.

Manufactured sand need not mimic the natural product: in fact manufactured sand can have some advantageous properties entirely due to its dissimilarity to natural sands. For instance, natural sands must have nearly all of the microfines removed, because they might contain deleterious material, whereas crushed rock from a uniform homogeneous deposit without incursions may generally retain its microfines without detriment. Much successful research has been carried out on the inclusion of high levels of microfines in manufactured sand.

References:

1 Hudson B P. “Crushers affect Product Quality”, Quarry magazine, April 1999


AMAZING Liebherr Excavator Climbs To The Top September 02 2014

Check this out...


New CAT966K XE Arrives for duty at the Quarry! April 04 2014

a photo of our lovely loader in action

Machine Features & Specifications

MODEL CAT 966K XE
ENGINE CAT C9.3 Acert Diesel Engine with common rail fuel system and next generation turbocharger
CAT Clean Emissions Module including Diesel particulate filter with automatic on-the-go regeneration
Meets EU Stage IIB Regulations
Net Power 243 KW. 325 HP
TRANSMISSION Automatic Planetary Power Shift transmission with 4 forward and 3 reverse
Programmable virtual gears
Dual Mechanical and Hydraulic transmission working side by side
HYDRAULICS Electro Hydraulic implement controls with two valve operations
Load Sensing Hydraulics maintains performance and improve fuel efficiency
LOADER LINKAGE BUCKET Z-bar loader linkage
Supersized 4.8 general purpose performance series bucket with bolt on cutting edges
OPERATOR STATION High visibility Roll Over Protection System (ROPS) cab
Joystick steering control with speed sensing and force feedback
Storage spaces for lunch box, mobile phone, drinks etc.
Heated air suspension seat
High resolution colour display incorporating rear view camera
TYRES 26.5R25 Michelin XHA2
OPERATING WEIGHT Aprroximately 24,189 Kgs
FEATURES Telematic Link to Finnings at Cannock for engine and performance diagnostic
Weigh load equipment also with Telematic Link for enhanced performance analysis
Climate Control with Air Conditioning
Halogen work light package
Roading lights package
Product link installed
All round mirrors package
Ride control
Full Hydraulic enclosed wet brake
Engine air intake precleaner
Rear limited slip differential
Swing out rear fenders
Radio CD player
CAT Autolube
Hydraulic inclined ladder
ADDITIONAL SPECIFICATIONS Heated Convex Mirrors 938-980[R]
Safety Chevron
Blue Flashing Beacon
Smart reverse alarm
Extra long seat belt
Strobe Beacon

The Battle of the Aggregates Levy! March 20 2014

Ever since its introduction, the Aggregates Levy has been controversial within the UK. Sarah-Jane Williams, of Stephens Scown LLP, explains why the controversy is still raging

The Aggregates Levy was intro­duced in the UK as part of the Finance Act 2001 and came into force in April 2002 and is a tax imposed upon the commercial exploitation of rock, sand and gravel in the UK. The intention of the levy was to improve the environmental impact of the mining industry; encouraging use of secondary or recycled aggregates and to incorporate the environmental cost into the market price. The current rate of the levy is £2 per tonne and has been frozen at this rate since 2009.

As with any tax, Aggregates Levy was unpopular from the outset with the reliefs and exemptions being particu­larly controversial. The British Aggregates Association (BAA) has been fighting against the levy for over 11 years and contends that it has had a detrimental impact on some sections of the industry with a number of opera­tors going into liquidation. It is its belief that the levy constitutes State Aid as it penalises some UK operators financially but not others, which distorts competi­tion and is contrary to Article 107(1) Treaty on the Functioning of the European Union (ex Article 87(1) of the EC Treaty).

Brief Background

In 2002 the BAA submitted its views to the European Commission believing the levy contained State Aid due to the exemption for exported aggre­gates, the exclusion of certain materials and the differing appli­cation of the levy in Northern Ireland.

At this stage the European Commission concluded the levy did not comprise State Aid. The BAA appealed to the General Court of the EU in 2006 seeking an annulment of the Commission's decision but the appeal was dismissed.

The BAA subsequently appealed to the European Court of Justice where the 2006 deci­sion was set aside and referred back to the General Court. In March 2012 the General Court annulled the Commission's origi­nal 2002 decision and referred it back for further consideration.

Following this success, the BAA requested the stay on its appeal be lifted and on 10 April, 2013 the Court of Appeal gave BAA permission to proceed to a full hearing (scheduled for 7-10 October 2013).

Recent Developments

The 2002 decision was annulled on the basis that the Commission had not sufficiently scrutinised whether the levy contained any State Aid in coming to its original decision. As a result of this the European Commission recently announced a Phase 11 investigation into the levy, full details of which have yet to be made public.

The UK Government issued Business Brief 24/13 on 16 August 2013 confirming that a formal investigation into the exemptions and release has commenced. The investigation is considering whether State Aid is contained in the exemptions and relief for the following materials:

Ball clay and china clay: Ball clay and china clay and spoil, waste and by-products resulting from their extraction or separation from any quantity of aggregate.

Other industrial materials: Anhydrite; barytes feldspar; fireclay; fluorspar; fuller's earth; gems and semi-precious stones; gypsum; any metal or the ore of any metal; muscovite; perlite;potash; pumice; rock phos­phates; sodium chloride; talc and vermiculite that are used as aggregate, and spoil from the separation of any of these indus­trial minerals from other rock with which it was won.

Coal, lignite, slate and shale: Material that is wholly coal, lignite, slate or shale and that is used as aggregate; mate­rial that is mainly but not wholly coal, lignite, slate or shale, and spoil from the extraction of or separation from any aggregate of coal, lignite, slate or shale.

Clay: Clay that is used as aggregate.

Spoil from industrial processes: Material that is mainly but not wholly spoil, waste or other by-products of any industrial combustion process or the smelting or refin­ing of metal.

Whether or not the levy constitutes State Aid requires an assessment of the relevant tax exemptions and whether or not they place the recipient in a more favourable position than competitors who pay the tax. It is generally defined as aid granted by a Member State to businesses which is generally incompat­ible with the common market because it has the potential to distort competition and affect trade between EU Member States. The EU Commission regulates the actions of Member States for actions which may inhibit competition and intra­community trade.

What Now?

The UK Government will have to answer a series of questions and provide evidence to the Commission supporting their view that the exemptions do not constitute State Aid. Whilst the investigations are ongoing there has been no request for the suspension of payments and HMRC stipulate in their 24/13 brief that those commercially exploiting aggregate in the UK have a continuing legal obliga­tion to pay the levy.

Should the European Commission and/or the Court of Appeal conclude the exemp­tions are State Aid, and therefore unlawful, there is fear in the industry that the businesses that have benefitted from the exemp­tions will have to repay that aid. This would have a detrimental impact and may make other operators insolvent.

The BAA has concluded in its press release dated 23 August, 2013 that it is deeply concerned by HMRC's IBM Revenue and Customs] flagrant disregard for EU State Aid law and by the potential risk posed to those companies which are being encouraged to continue with exemptions that are now subject to the investigation.

At a time when the UK Government is trying to promote growth in the business sector and to get the UK building again, it is clear that some of the exemptions imposed under the levy are hitting operators hard. Some businesses are withhold­ing payment of the levy pending the outcome of the Phase II investigation and operators may face enforcement action from the Treasury.

Those involved in the aggre­gates industry avidly await the outcome of the litigation currently going through the Court of Appeal and the subse­quent result of the Commission's investigations. The battle of the Aggregates Levy is set to continue and it is hoped that any decisions made will not maim the industry any further.


The Construction Products Regulation (CPR) applies from 1 July 2013 March 18 2014

The CPR aims at clarification of the basic concepts and of the use of CE marking; simplifica­tion of the procedures, so as to reduce the costs incurred by enterprises, in particular SMEs, and increased credibility for the whole system.

The key concept of the CPR is the declaration of performance (DoP), which is replacing the declaration of conformity (DoC) from the previous CPD. For every construction product covered by a harmonised standard or a European Technical Assessment, the manufacturer will draw up a declaration of performance with the intended use of the construc­tion product. Since 1 July 2013, all construction products placed on the EU market have to be CE marked.

The Commission's Delegated Act (adopted September 2013) will be transmitted to the European Parliament and the Council for their reaction. At the end of the procedure the Delegated Act (most probably a Regulation) will be published in the Official Journal of the EU.

Meanwhile, manufacturers can continue their practice to provide information about the performance of their products on a website. It is noted that a batch of the same product supplied to a single user can be covered by a single DoP and that a paper copy of the DoP should be supplied if the recipient of the product requests it.

What is a delegated act?

The Treaty of Lisbon creates a new category of legal act: delegated acts. The legislator delegates the power to adopt acts amending non-essential elements of a legislative act to the European Commission.

For example, delegated acts may specify certain technical details or they may consist of a subsequent amendment to certain elements of a legislative act. However, this delegation of power has strict limits. In effect, only the Commission can be authorised to adopt delegated acts. Furthermore, the legislator sets the conditions (Article 290 of the Treaty) under which this delegation may be implemented.

Delegated Act in CPR

Article 60 of the CPR, for the purposes of achieving the objectives of the Regulation, in particular removing and avoid­ing restrictions on making construction products available on the market, the following matters shall be delegated to the Commission, (...) inter alia:

(b) the conditions on which a declaration of performance may be electronically processed, in order to make it available on a website in accordance with Article 7;

(e) the adaptation of Annex III, table 1 of Annex IV, and Annex V in response to technical progress.

Delegated acts on DoP on a website, on Annex III (Declara­tion of Performance) and Annex V (Assessment and Verification of Constancy of Performance) meetings over July and September, the European Commission organised meetings on the Delegated Act (DA) on DoP on a website, on Annex III and Annex V.

The UEPG participated in the meetings. Following comments received, the European Commission should make an inter-service consultation. The documents should then pass through the Council and Parliament to approve or reject the Delegated Act, as no amend­ment is possible.

The Delegated Acts on DoP on a website should be published in early November. The European Commission will draft the conditions to use a website but will not address technical solutions available to fulfil those conditions, as a DA should not obstruct any technological development. A DA may not modify the responsibilities of the market surveillance authorities.

Following comments, the DA on Annex III and Annex V should be published by the beginning of 2014.

Next Steps -

UEPG Technical Committee (under the active chairmanship of Jean-Marc Vanbelle (FEDIEX), in cooperation with Construction Products Europe, is monitoring the issue. In September/October, UEPG will report on challenges encountered over the first phase of the implementation of the CPR, and send comments on Delegated Acts proposed.