【正文】 裂能力。缺點：施工難度大，技術(shù)要求較高，材料費用比較昂貴。對于冷接縫的處理，應(yīng)先將接縫處沿邊緣切割整齊、清除碎料，然后預(yù)熱軟化接縫處，涂刷乳化瀝青，再鋪筑新混合料。對于縱向裂縫，如分幅攤鋪時，前后幅應(yīng)緊跟，上、下層的施工縱縫應(yīng)錯開15cm以上，攤鋪時控制好松鋪系數(shù)，使壓實后的接縫結(jié)合緊密、平整。在舊路面上加鋪瀝青路面結(jié)構(gòu)層前，須銑削原路面后再加鋪，以延緩反射裂縫的形成。對于細裂縫(2～5mm)可用改性乳化瀝青灌縫。灌縫前，必須清除縫內(nèi)、縫邊碎粒、垃圾，并使縫內(nèi)干燥。對裂縫很大的情況，必須將裂縫兩邊瀝青混凝土開挖，先處理基層再攤鋪新混合料，水穩(wěn)定性好、收縮性小的半剛性材料是首選基層。另外運輸途中絕不能出現(xiàn)顛簸嚴(yán)重運輸時間長情況。 ： 　　主要是提高混合料的高溫穩(wěn)定性。在瀝青中摻人不同的改性劑能改善瀝青的很多性能，粘度提高，感溫性能穩(wěn)定，瀝青軟化點提高，針入度提高，耐老化性能提高，從而也相應(yīng)的提高了瀝青的高溫穩(wěn)定性和抗車轍能力。從改性瀝青混合料生產(chǎn)實踐中可知，PE對改善瀝青混合料的高溫穩(wěn)定性效果明顯，而EVA對改善瀝青低溫延度方面效果明顯。主要病害裂縫的產(chǎn)生很大程度上是由于不規(guī)范施工造成的，只要積極采取有效措施，規(guī)范管理，合理組織施工工序，杜絕不利因素的發(fā)生，裂縫問題一定可以減少。11參考文獻參考文獻清華大學(xué)《混凝土結(jié)構(gòu)》中國建筑工業(yè)出版社 ：人民交通出版社，2002。感謝學(xué)校，感謝我的所有任課老師讓我更多的了解道路橋梁。如今，伴隨著這篇畢業(yè)論文的最終成稿，復(fù)雜的心情煙消云散，自己甚至還有一點成就感。t use silt, swamp, organic soil, frozen, grass, garbage and contain the soil corrosion. More than 50 for liquid limit and plastic index of soil, should not be monly 26 as subgrade filling. The smallest of subgrade filling maximum diameter and strength to quantify the value of the standard, using CBR characterization of subgrade soil strength, introduced the concept of road bed. On the bed of the packing of the condition, highways and highway pavement base class 030cm below the road bed packing should be more than 8, the value of CBR under the bed and the road below, also fill are specified. As subgrade filling cannot reach the minimum strength, should take mixing aggregates, or in filling, or use such as lime stabilization material handling, not for other senior level road paving road, also want to use expressway and the specified level of roads.paction soil baseEarth paction effect of soil paction degree is to improve the permeability of soil, water, reducing the height of capillary, control water and soil erosion of concentration and softening, or because of the yankees and frost heaving the nonuniform deformationearth paction theoryIn most cases, by soil subgrade soil, water and air is posed of threephase system. They all have their respective characteristics and interdependent mon in a unity, constitute the physical characteristics of the soil, viscosity, permeability and elasticity, plasticity and mechanical strength, etc. If the situation changes, is posed of soil physical properties to be different. Therefore, to change the characteristics of soil, and the change from the start. Soil paction, is by mechanical means to change the soil structure, to improve soil base of strength and stability.Earth paction effect of internal factors of soil moisture content and main is nature, external factors have paction function, paction methods and tools, etc.1 paction effect of moisture（1）water is the decisive factor of paction effect,2 when the optimum moisture in the soil, which is hard plastic state, the most easily get the best paction effect,3 the soil pressure ShiDao best density water stability.For soil paction effect(1) the different soil types are different optimum moisture and maximum dry density,2 higher (liquidlimit high dispersion viscosity, the soil, the larger), the absolute best content of absolute maximum dry density and lesser,3 the sand and clay paction of good performance (ρ c ) and cohesive soil paction of poor performance (ρ ) c.paction of paction effect functionThe same kind of soil paction function with the best content decreased, while the maximum dry density function with the paction increases, When the moisture content must, when the paction function is higher density, When the paction increases to a certain function, soil paction degree is not significantly increased, it shows that, for a certain kind of soil, if exceeds a certain extent, in which the paction increases the way to improve soil paction degree is not economical.paction tools and methods for paction effect(1) the paction tools, how effective pressure transmission is different also. Research shows that, after the pressure of machines, vibrationtype transmission deepest, most shallow rolling type.2 the paction machine, load weight more hours long, soil paction degree is higher, but the rate of growth of density decreases with increase of time, paction machine is heavier, soil paction degree was increased with increasing unloading time quickly, but more than a time limit of soil deformation, destruction will increase sharply and achieve, Machines that exceed the soil heavy intensity limit, will cause the soil.3 the higher speed roller paction effect.Currently, generally USES the roadbed construction of largetonnage roller (less than), the road roller upwardleading continuous to center on both sides, until the surface of the wheel track without obvious, follow after the first light weight, low vibration, the first after stability after the first slow, quick, high, the principle of the wheel, paction effect of overlap has been improved. To improve the subgrade soil paction degree on the good effect. Rules and regulations and highway pavement under the bottom 80 more on the part of the subgrade paction degree of other must 94%, senior level road paving road, when the paction degree also should press expressway and the level of roads by the standard. In addition, also increases the base of subgrade paction degree should not be less than 93% of regulation. As a main road in the west of highway construction, secondary specialized standard for senior road pavement design, from the beginning, all roadbed inspection standards adopted grade highway acceptance criteria.special damp area of subgrade soil pactionIn special areas damp, the roadbed paction is very difficult to make some adjustment standard: one is the degree of paction test data can be determined according to the standard list or lower numerical reduce 23 percentage points, Two is less than , natural consistency for more than 40 liquidlimit, plastic index of more than 18, when used in goo soil under the bed and road embankment packing, can adopt prescribed light pacted standards, Three is to improve the