市政易混点总结（Summary of municipal mixing points）.docVIP

市政易混点总结（Summary of municipal mixing points） Summary of municipal mixing points P2: expressway, trunk road with high-level road materials: cement concrete, asphalt concrete, asphalt macadam, natural stone; secondary roads and branches with high-level road materials: asphalt penetration macadam and asphalt surface treatment. P2: the failure of a flexible pavement depends on the ultimate vertical deformation and flexural tensile strain; the rigid pavement depends on the ultimate flexural tensile strength. P3: graded gravel and graded gravel can be used as the main sub roads and below the road base; graded crushed stones and graded crushed stones can be used at all base and subbase. P6: base material: heavy traffic should use lean concrete, roller compacted concrete, asphalt concrete; heavy traffic should use cement stabilized gravel or asphalt stabilized macadam; in light traffic, should choose a cement or lime fly ash stabilized aggregate or aggregate. P7: Several seams about concrete: (1) a paving width is less than the road width, with the rod sewing; a paving width greater than 4.5 meters, set with a bar basting; (2) in addition to the summer construction of the plate, and the plate thickness is greater than or equal to 200mm, there is no expansion joint, the other should be set; (3) heavy and heavy traffic, transverse expansion and contraction joints to make dowel; (4) hard cut seam 1/4-1/5 plate thickness; soft and hard combination and soft cut depth is not less than 60mm; inserted rod longitudinal longitudinal contraction seam; kerf depth is not less than 1/3-1/4 thick, not less than 70mm. Contraction width 4-6mm. P7: roads, main roads should be made of Portland cement, Portland cement and ordinary portland cement. Other roads may be made of slag cement. P7: the particle size of crushed stone in concrete is not more than 31.5mm; the aggregate in the primary aggregate is no more than 37.5mm; P8: dense suspension: large cohesion and small internal friction angle,