GuaraSCREED is a proprietary mastic asphalt screed manufactured using bitumen, fillers and graded aggregate as well as where appropriate additives to suit the required end usage.
GuaraSCREED will provide a substantial and continuous support to the subsequent mastic asphalt application and can be purpose designed for applications ranging from roofing, both traditional and protected membrane, balconies and access walkways through to car or lorry deck specifications.
NB. The requirement for a separate vapour control layer is avoided where a warm roof specification using an asphalt screed is specified.
Whilst GuaraSCREED for use in an elevated car deck specification would be designed to have a compressive strength as good as that of concrete of 20 N/mm2 the product can be modified to provide similar properties in a lightweight format where deadweight is an important consideration. The product can also be modified for use in chemically hostile environments to provide falls under specialist flooring grades to assist in the collection and containment of aggressive liquids.
GuaraSCREED can be specified in the majority of cases falling to minimum thicknesses where traditional sand/cement and lightweight screeds require a minimum thickness of 50mm.
In addition to replacing a wet trade GuaraSCREED can be trafficked when cooled to ambient temperature and provide temporary waterproofing to the structure to allow internal trades to progress.
For the assessment of the Indirect Tensile Stiffness Modulus test (ITSM), cores were tested in accordance with BS 00213.
The results of the ISTM testing gave a range of results from 7482 to 8762 MPa. For a highways bituminous pavement, values above 3000 MPa are often taken as being good, and values below 1500 – 1000 MPa being poor.
With results showing that the material achieved values at least twice as high as the 3000 MPa threshold, the material was classed as having a good stiffness. Stiffness helps in the resistance to deformation, which is an important factor with flexible materials.
- Compressive strength testing was undertaken in accordance with BS 1881-120 1983 (test method modified).