This paper shows microphotogrammetry to be a very promising method of measuring surface texture and aggregate re-orientation, especially during the early stages, of a sprayed seal. Stereoscopic microphotogrammetry is already well established in the discipline of Surveying, in the production of contour maps from aerial photography. Photography has the advantage of being quick on site, and accurate. Unlike the sand circle texture method and vehicle mounted texture meters, photography does not physically interfere with the surface being monitored, or delay the rolling process being assessed. This paper concludes that, using this method in the cases under study, paid rolling was ineffective after about after about 9 individual roller passes, which was about 50 percent of the paid rolling effort specified and applied. This is in accord with the New Zealand findings, and indicates that cost benefits may well be obtained by reducing the total paid rolling time. The method could be developed to offer several additional R&D benefits. (A)
Abstract