WASHER 0850138 - Caterpillar

Setting the Paver Speed
Note: The thickness controls may be different on different screeds.After the paver has been set up and the paver has been adjusted, one of the most important fundamental concepts of smooth paving is maintaining a constant paving speed. In most cases, the machine can pave smoothly at any speed. The paving speed must match the delivery of mix to the job site. Maintaining a constant speed is crucial for a smooth mat.If the paving speed is changed significantly, the screed's height will change and the mat's smoothness will suffer. Also, if paving speed changes, the demands on the feeder system change. You must adjust the feeder system's controls in order to match the new settings.For quality results, always follow the basic concepts for setup and keep the operation consistent. Ending a Mat
Several methods are used in order to obtain a good vertical edge at the end of a mat. The methods will allow a compactor to move on the mat and off the mat.
Illustration 11 g01351614One method of ending a mat uses a piece of paper (14) about 914 mm (3 ft) wide. The paper should be a little longer than the width of the mat.The paver is run until all of the material in the hopper is used. The conveyors and the vibrators are stopped when the hopper is empty. The screed is lifted and the paver is moved away from the mat. Rake the material evenly across the width of mat (16) in order to form an opening for the paper. The paper is laid across the width of the mat in the opening. Material (15) is raked onto the paper. The material is raked to the same depth as the mat that was laid.A layer of dirt or other material can be used instead of the paper in order to achieve the same results.
Illustration 12 g01351615Another method of ending a mat uses board (18) that is the same thickness as compacted mat (19). An opening for the board is raked across the end of the mat. The board is placed into the opening. The remaining material is raked against the board in order to form ramp (17) for the compactor. The ramp will hold the board in place.Parallel Joints
To make a parallel joint, a matching joint must be made between the two mats. It is preferable to match the mats before the first mat has cooled.
Illustration 13 g01351619To make a parallel joint, do not allow the compactor to roll closer than 150 to 300 mm (6 to 12 inches) to the edge of first mat (22) closest to joint surfaces (21). Roll the parallel joint when second mat (20) is rolled.To make the parallel joint, the edge of the screed should overlap the first mat 25 to 50 mm (1 to 2 inches). The edge of the screed should be flush with the first mat.If the first mat has been rolled, raise the screed in order to allow enough material for compaction. In order to