ASPHALT ANSWERS
Could it be that the biggest innovation for the asphalt paver in the last 25 years is the advent of sonic controls for auger control and depth control ?
means of a slat conveyor , distributed across the roadway by a screw conveyor , consolidated by a vertical tamping bar that vibrated at 1,200 strokes per minute , and finished by a rear screed . The machine ’ s design and slow speed compensated for irregularities in the roadbed , and it automatically produced a level mat of uniform thickness . What a concept . Sound familiar ?
I can imagine though , that in those days , the paving professional was way less concerned about mat quality and rideability tests as we are today . They were probably so excited to not have to dig their car out of a muddy tire rut that they forgave the occasional mat inconsistency . I also can see the inspector following the machine and telling the operator exactly what he is doing wrong . Let ’ s fast forward to my Blaw Knox manual of the ’ 80s and ’ 90s . It describes a couple of really innovative ideas to help the contractor be more efficient . One of these is an automatic feed control system that actually turns the augers on and off when the material has filled the extensions . These were paddle type switches , but you could also get a system that used sound waves to measure the amount of material . The next was a joint matcher that attached to the screed arm and was connected to a shoe that actually rode on the previous pass or other grade reference to assure precise leveling . This , of course , it the predecessor of today ’ s sonic controlled grade control systems . Could it be that the biggest innovation for the asphalt paver in the last 25 years is the advent
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