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Kari Kärkkäinen
tel. 040 551 0391
Kari@purkupiha.fi

Jussi Thomander
tel. 050 372 3392
Jussi@purkupiha.fi

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DEMOROCK® AGGREGATE FOR EARTHWORKS

Demorock® aggregate is crushed concrete intended for earthworks, produced by Purkupiha. Demorock® aggregate is produced by crushing concrete from demolished buildings. During demolition, the rubble is carefully sorted to make sure that no other materials or harmful substances are included in the concrete aggregate. Its construction and environmental engineering characteristics guarantee that Demorock® aggregate is ideal for earth construction, and this is ensured by our rigorous quality control during its production. To promote quality control, we have compiled an in-house quality management handbook that covers the whole chain of production for concrete aggregate.

Demorock® aggregate is extremely simple to use in your building project. when necessary, we handle the required permits and notifications for you and send them to the appropriate centre for economic development, transport and the environment.

We even deliver the aggregate to your building site.

Purkupiha produces approximately 120,000 tonnes of usable Demorock® concrete aggregate a year from its demolition sites nationwide. The production, quality control and sales of Demorock® aggregate are a part of our operational system, which has received the ISO9001:2008 and ISO14001:2004 quality and environmental certificates.

The recycling of Demorock® concrete aggregate is easy, thanks to the Government Decree Concerning the Recovery of Certain Wastes in Earth Construction. According to the decree, Demorock® aggregate can be utilised in the following kinds of earthworks:

  1. Public roads, streets, bicycle lanes and footpaths, as well as the areas directly connected to them that are necessary for road maintenance or vehicle traffic, excluding noise barriers.
  2. Parking areas.
  3. Sports fields and tracks in recreational and sports areas.
  4. Railway yards and the storage areas and roads of industrial, waste treatment and air traffic areas.
DEMOROCK – TRAITS AND QUALITY REQUIREMENTS
Specifications and Quality Requirements
The basic traits of Demorock® aggregate products
Trait Demorock 0/90
Particle size (mm) 0/90...0/125
Fine aggregate content F7
Frost susceptibility frost resistant
E-modulus (MPa) 150
Max percentage of brick by weight 10
Max percentage of other materials by weight 1
Bulk density (Mg/m3) 2,30...2,70
Environmental Technology Requirements
The limiting values of the content and solubility of harmful substances in Demorock® aggregate in quality control analyses [Government Decree Concerning the Recovery of Certain Wastes in Earth Construction 591/2006, amendment 403/2009]
Harmful substance Limiting value, mg/kg of solid matter quality control analyses    
  Concentration Solubility (L/S = 10 l/kg) Covered structure Solubility (L/S = 10 l/kg) Surfaced structure
PCB 1,0    
Arsenic (As) 50    
Cadmium (Cd) 10 0,02 0,02
Chromium (Cr) 400 0,5 0,5
Copper (Cu) 400 2,0 2,0
Lead (Pb) 300 0,5 0,5
Zinc (Zn) 700    
Sulphate (SO42-)   1000 6000
Demorock Grading Curves
The grading curve of Demorock® concrete aggregate in comparison to the upper and lower limits for sub-base 0/90 aggregate in accordance with InfaRYL 2010 specifications.
Demorock® - The grading curve of Demorock® concrete aggregate in comparison to the upper and lower limits for sub-base 0/90 aggregate in accordance with InfaRYL 2010 specifications.