mastic asphalt, asphalt hot mix + grouting asphalt pavements

Handling
The mastic asphalt is transported to the building site in
heated dumpers in which the asphalt is kept at the appropriate
temperature.
Installation weight
Installation thicknesses of approx 3.0 cm per layer correspond
to installation weights between 50 kg/m 2 and 100 kg/m 2 .
Joints
Mastic asphalt can be laid without joints over large surfaces.
Structural joints must be taken over into the mastic
asphalt screed. They must be designed in accordance with
the stress upon them.
A distinction is made between the following types of joint:
- A movement joint is a joint in the screed that separates
it completely into two parts.
- A dummy joint is a joint in the screed which is cut into
the screed through half the screed thickness at most
- An edge joint is a joint which separates the screed
from adjoining installed building elements.
Load-bearing capacity
In assessing the load-bearing capacity of mastic asphalt, it
is the surface pressures applied rather than the total
weights that should be taken into consideration. Mastic
asphalt is able to absorb very high dynamic loads, i.e.
almost any traffic loading, without any damage.
With floating screeds, the permitted traffic loading also
depends on the load-bearing capacity of the insulating
layer.
Mastic asphalt is not sensitive to vibrations; it absorbs
vibrations over short distances.
Surface finish
With screeds, the surface of the mastic asphalt is abraded
with fine sand while it is still hot. This gives it a non-slip
surface even in damp or wet conditions. Further treatment
of the surface may be necessary for certain applications.
In the case of outdoor surfaces and mastic asphalt on traffic
areas, the mastic asphalt may be dressed with fine
chippings 1/3, or chippings 2/5 to 5/8 while still hot, to
increase the non-slip properties. The light coloured chippings
also reduce maximum surface temperatures.
Stability
Mastic asphalt is stable and can withstand high traffic
loads with no great deformation. As mastic asphalt grade
0/11 S in accordance with ZTV Asphalt-StB (Supplementary
Technical Contract Conditions for the construction
of asphalt road surfaces), it is suitable for
roads subject to particular stresses.
Composition
The composition is decided by the contractor, in accordance
with VOB/C DIN 18317 Road construction work,
asphalt superstructure layers and DIN 18354 Mastic
asphalt paving works.
The proposed purpose and the expected loading must be
taken into account and given in the specification.
For binder, base and wearing courses of traffic-accessed
areas within the remit of the Federal Ministry of Transport,
the requirements of ZTV Asphalt-StB, depending on the
mix types, contain information on grain size distribution,
and on the binder content, nature and type.
For screeds subject to particular stresses (industrial
screeds) as specified in DIN 18560-7, limit values for grain
size distribution are given in DIN 18560-1.
Torch-on bituminous waterproofing membranes
For waterproofing work under mastic asphalt, special
torch-on bituminous waterproofing membranes are used
(see DIN 18195-2 Waterproofing of buildings, materials)
torch-on bituminous waterproofing membranes with
upper reinforcement
torch-on bituminous waterproofing membranes with
metal lining.
FOAMGLAS ®
145