second diagonal rolling crosses the lines of the first. The rolls must be sprinkled in order to prevent the asphalt from
adhering to the rolls.
c. Wearing Course. The wearing course mixture should be rolled in the same manner as described in a and b
above. During the rolling the surface must be tested for trueness and all irregularities must be corrected.
33. Operating on Fill Soils
Many fill soils will compress very little under this type of tandem roller. If available, use for such soils the tamping
roller (also called the sheep's-foot roller) which is much more effective for fill soil jobs.
34. Handling on the Paving Job
a. While the officer in charge of the work must prescribe the amount and method of rolling necessary for a particular
road material, the operator of the roller, to obtain the best results, must be guided by a few basic rules in handling the
roller.
b. On soft, pliable materials, the roller must be run at slow speed so that the material will not be shoved or displaced.
Do not accelerate the roller on the road material.
c. When rolling hot or tacky materials, the sprinkler system (which prevents material from sticking to the rolls) should
be in perfect working condition. The roll scrapers must be properly adjusted.
d. Do not make sharp and fast turns. The roller must be steered slowly so that the material will not be marked or
shoved out of place.
e. Start the roller moving slowly and smoothly. One of the easiest ways of damaging an asphaltic pavement during
construction is to start rolling too fast and jerkily.
f. Do not leave the roller standing on a cooling or setting road surface, as the weight exerted by the rolls will leave
depressions in the pavement.
g. Do not allow lubricants to drip onto the new material if it is of an asphaltic nature. Oil damages new asphalt by
weakening its ability-to set properly. After lubricating the roller, be sure that all drain plugs are tightly closed, and that
excess lubricants have been wiped off.
35. Movement to a New Location
If it is necessary to move the road roller a long distance, the road roller must be loaded on a flatcar or carrier. For
complete loading and shipping instructions, refer to paragraph 7. When moving the road roller for short distances under
its own power, the water must be drained from the rolls. Avoid paved surfaces. If it is necessary to drive over paved
surfaces, drive slowly and avoid damage to the pavement. Watch the road for sharp rocks, nails, and scrap iron that may
damage the roll faces. Do not drive at high speeds.
30
