Chapter 7: Local Road Maintenance Management 218 Tables 7.5 to 7.8 below show the typical procedural activities for the maintenance of asphalt pavement. On the other hand, work activities for the maintenance of concrete pavement are shown in Tables 7.9 to 7.11. These procedural steps for the maintenance activities of sealed pavement (asphalt and concrete) are adopted from the Road Maintenance Guidelines of DPWH. Table 7.5 Premix Patching Bituminous Pavements Purpose To eliminate hazardous conditions and to provide smooth, well- drained surfaces. Procedure 1. Remove standing water and temporary patching material from defect or area to be leveled. 2. Shape defects so that; (a) depth provides for suiffcient strength; (b) sides are vertical; (c) corners are square or slightly rounded; (d) sides have no abrupt changes in line; and (e) hole is cut back into sound pavement. 3. Add base material if needed. 4. Clean and tack defects or area to be leveled. 5. Place premix in layers and compact each layer. Mix should be placed only within limits of hole and area to be leveled. 6. Final layer should be lfushed with surrounding surface. 7. Dig channels through shoulders, if needed, to allow water to drain. 8. Check cross section, proifle and drainage. Rework if needed. Notes • Materials to be used should be dense graded asphalt mixture with maximum grain size equal to or less than 19 mm. • Wet part should be heated to be dried with burner. • Laying of asphalt mixture should be approx. 1 cm. higher than the adjacent surroundings to give allowance for settlement. • When depth of pothole is more than 7 cm, compact mixture in two layers.