【正文】 hfil1 soft and in Taiwan back filling carefully, on the basis of the disposal if foreseeable settlement, can adopt thin layer of asphalt concrete pavement of excessive or block form, For settlement after construction, permanent stability of concrete pavement, board, In the underground water, roadbed grassroots high and more rain area, should consider the design of drainage gravel pad peration. Cold region should be prehensive consideration of the design of drainage and antifreezing cushion. At the same time, ensure the quality is to prevent the seam of cement concrete pavement damage of natural conditions, according to local key seam bulge, so try to be long in joint design should choose reasonable joint type and fine seam filling materials. Construction Reasonable selection of raw materials, strictly control the quality of materials is to realize the quality of cement concrete pavement design and use of science, accurately, concrete proportioning design, production, uniform concrete is to guarantee the quality of cement concrete pavement of key, Promote the use of mechanical construction method is to solve the good quality of cement concrete pavement panel and favorable measures, the specification, location, lever must ply with the design requirements, spacing, with the joints with vertical 15 wall surface plate and road line parallel. The concrete for caulking caulking board and general difficult time of influence, casting, vibrating closegrained seams low strength of concrete, should strengthen the juncture of vibration and deflection, Plate forming, according to local conditions of temperature and time, avoid cutting strict regimen appeared in whole or in health in hydration of cement concrete under the gap, intensity, Should as far as possible, if there is difficult to recognize construction of concrete construction, dominica, must avoid big pit slot and rocks, lest cause in the initial period of concrete panels vibration caused by driving plate fracture, When the line longitudinal grade super 2% should adjust paving, must follow up direction paving. To avoid problems caused by collapsbillity board tiny crack and plate fracture, dismantling formwork should avoid to touch off the symmetry deflection gnawed edges. The construction of grassroots materials, mixing, and focus on using paver, stay on the paving grassroots pacting, strictly on health, prevent grassroots appear dry shrinkage or temperature crack, In order to reduce the roadbed paction deformation of soil subgrade, increase strength and stability, must be carefully for paction, especially to strengthen DiBian road embankment, lateral part of RCC density as uniform, Don39。t be two kinds of material properties of great differences, but need to set of embankment is a not too long in transition section, with the general bridge or other structures, should 16 undertake loading thru embankment, even overload preloading foundation settlement, accelerate in May, under the condition of gravel filling machine adopts hydraulic permeability of embankment and reduce traffic opening after the settlement. 230 maintenance management The cement concrete pavement damage, such as local timely and effectively to repair, often can cause damage to the rapid development, one of the most often is the most cannot ignore the work is always clean and maintenance of the juncture of concrete pavement sweeper must often has no way and other good thing, from the wheel rolling and road surface and caused the pits, in order to prevent the juncture of failure to replace aging or damage already filled seam, make joints to maintain good conditions, packing to prevent dirt, sand, stone, the water into the seam, causing damage to the road surface crack, and early disease, should promptly repair, prevent the formation of further damage, but also must pay attention to the maintenance of pavement drainage system, perfect supporting enlarge fund investment to build ditches etc drainage system, often dredge pavement drainage facilities, prevent water through the juncture of pavement damage or cracks. Highway maintenance and management department, except for the daily maintenance work, should be regularly anization investigation, road maintenance work, formulate plans to determine the content of maintenance, maintenance work, improve 17 the quality and mechanized maintenance level, ensure the quality of highway maintenance, besides, still should strengthen the management of highways, strictly control the overload vehicles driving. 18 The third chapter of cement concrete pavements asphalt material repair (1) filled seam filling. Filling material production mainly adopts the wseam material in xinxiang, sewing, sewing machines, should be used for better quality after years of use. Homemade seam filling material mix asphalt 96% (60 + heavy diesel 4%) 60% ~ 65%, asbestos and cement crumbs 5% ~ 10% ~ 15%, rubber powder 15% ~ 20%, the effect is good. (2) overly sexual treatment using the method of asphalt gravel mask. Using asphalt gravel main advantage is the maintenance convenient, quick, affect traffic construction, immediately after forming small can open, save cost. But let the road looks not beautiful, use short cycle, only as a temporary measure to solve the problem, cannot fundamentally. block concrete slabs and the local repair revision Applicable to seriously broken plate, subsidence, deflection fracture, etc. Construction and operation method: cut unless broken plate and clean, check whether the grassroots have the enough strength and stability, if appear grassroots soft elastic, loose, no matter requires all disadvantage, stable, and then used to draw up a d23 for lean concrete construction