沥青(国外英文资料).docVIP

沥青(国外英文资料) 5. evaluation method of asphalt surface compactness. Answer: the compactness of the asphalt pavement with 1-3km long section for inspection and assessment unit, inspection and assessment of the degree of compaction section representative value: K=K with a cross, -ta / Reagan inside a n *S. When K is larger than Ko and all the measuring points is greater than or equal to the specified value minus 1 percentage points, the evaluation section of the degree of compaction can be set out, when K is not less than Ko for the determination of value is lower than the prescribed value minus points of 1 percentage points, according to the percentage of the total number of check point value calculation. When K Ko, assess the degree of compaction of the road for unqualified, and rated as zero. 6. what are the basic requirements of asphalt concrete surface? Answer: (1) the mineral quality and gradation of asphalt mixture shall comply with the design requirements and construction specifications. (2) strictly control all kinds of mineral materials and asphalt dosage and the heating temperature of various materials and asphalt mixture. The indexes of asphalt material and mixture should meet the requirements of design and construction specifications. For the production of asphalt mixture, the extraction test and Marshall stability test should be carried out every day. The qualification rate of aggregate gradation, asphalt content and Marshall stability shall be no less than 90%. (3) the asphalt mixture after mixing should be uniform, no gray, no separation of thick and thin materials and the formation of lumps. (4) the grassroots level must be compacted, surface dry, clean and free of dust, the flatness and crown degree should meet the requirements. (5) when paving, the thickness and integrity of the paving shall be strictly controlled, and the segregation shall be avoided. Attention shall be paid to controlling the paving and rolling temperature, and rolling to the require