宁武至神池一级公路设计毕业设计开题报告(编辑修改稿)

宁武至神池一级公路设计毕业设计开题报告(编辑修改稿)内容摘要：

ability obviously improve . In this paper, according to south road construction test, the paper briefly narrates the requirements for the construction of the SBS modified asphalt. First, SBS modified pitch summary SBS modified asphalt is the original matrix asphalt (AH 70), on the basis of adding %, %, % of the SBS modifier, the modified asphalt, pared with the original asphalt, increase the high temperature viscosity, higher softening point. Under the condition of good mixture ratio design and construction, the durability of the asphalt surface and high temperature stability is improved obviously. In the process of the SBS modified asphalt production to a large number of indoor test, after the production of its technical index has carried on the field experiment, the experimental results show that the additive % SBS modified asphalt, softening point and peration index can satisfy the requirements of modified asphalt specifications, available SBS modified asphalt mixture ratio design of asphalt mixture. Second, the match ratio of the asphalt mixture of SBS is designed In order to make the design of mixture effect can be achieved from material requirements, construction technology and quality control standards and quality control method and so on many aspects put forward the following requirements, hoping to attract attention. (1)the raw materials are required Collect the materials thickly by 11: Used for modified asphalt mixture surface of the coarse aggregate, appropriate USES gravel or crushed gravel, its particle size specification and quality requirements shall be in accordance with the technical specification for construction of highway asphalt pavement (JTJ03294) coarse aggregate should be clean, dry, no weathering, no harmful impurities, and has a certain hardness and strength. 2. The coarse aggregate should have good particle shape, broken gravel used in highway, first class roads, should use big gravel breakup, and should have at least two or more broken face. coarse aggregate should choose the antislide surfaces of hard rock (neutral or basic igneous rocks). Because of the hard rock and there are big differences between asphalt sticky relay, coarse aggregate and asphalt adhesion should be no less than 4. For 3 to 5 mm stone chips part due to the low content, and the part of the structure of asphalt mixture formation scarf have certain effect, suggest using hard rock (basalt). Collect the materials thinly by 12 Asphalt pavement surface appropriate USES artificial sand as fine aggregate, fine aggregate should be clean, dry, no weathering, no harmful impurities, have proper granulometric position, and modified asphalt has good adhesion, natural sand due to the change of quality (mostly in the coarse sand), shape is smooth, and poor adhesion of asphalt, a larger impact on asphalt mixture. For highway, highway asphalt mixture, the content of natural sand should not be more than 20%, 03 mm stone chips powder can instead of natural sand. Pack the material by 13 Packing of layer should clean dry mixture for modified asphalt , specification requirement that quality should Accord with the regulations of “asphalt road surface Technical specification of the highway” its. 1, Modified asphalt mixture filling material appropriate USES strong base rock (limestone and magmatic rocks), etc. Add water stone fine grinding of mineral powder, kuangfen requires a dry, clean, unfavorable use mixture of dry dust recycling of powder production. 2, The cement and hydrated lime powder stuffing, its dosage shoulds not be more than 2% of the total mineral aggregate. 3, For asphalt mixture surface layer is not remended to use in production line of recycling powder mixture, when the plasticity index of less than 4 and hydrophilic coefficient is less than , the tested part can use, recovery of ore powder dosage per disk cannot be more than a quarter of the total. (2)Asphalt mixture match ratio is designed The mix proportion design of asphalt mixture, the mixture ratio design of modified asphalt mixture, which should be followed in technical specification for construction of highway asphalt pavement of hot mix asphalt mixture design goal of mix proportioning, production shop and try mixing of three phases, to determine the m。