Page 163 - RoadCem Manual - PCT BV

• Chip spreading requires uniform aggregate cover. A drag broom can assist this process on large areas.
• Rolling is preferably carried out with pneumatic rollers but can also be done by trafficking.
• Repeat steps 2 to 6, if a double layer is applied.
• An emulsion “fog spray” is sometimes applied to chip seals after they have been laid to enhance adhesion of the chippings.
• In slurry seals, crusher dust, bitumen emulsion, water and cement filler are premixed with either a specialized “mix and spread” machine or in a concrete mixer for spreading by hand with squeegees. Mixing by hand is possible but is not recommended.
Bricks and paving bloks can be used on a terrain for esthetical reasons or because very heavy loads are expected. With these loads it is possible that setting occurs. When applying bricks a thin sand layer must be laid under the stones. When this layer and the mortar between the bricks are mixed with RoadCem and cement then this results in a water impermeable construction. If a traditional joint and sand layer water seepage will occur in the construction and just like sand cement stabilization the water needs to drained from the construction using boreholes in the stabilization.
Figure 5.55 Applying paving bricks (automatically or manually).
Asphalt is often applied on the road and has the advantage that it is a stiff material and only minor deformations occur because of this. The disadvantage is that it is a viscous material and deforms with high temperatures and with relatively high static loads. When asphalt is applied on a RoadCem foundation of a certain thickness then the fatigue occurring below in the asphalt is the most important factor in the design. The thickness depends on the strength of the RoadCem foundation and the strength of the asphalt.
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