家长会心得体会（Parents meeting experience）.doc

家长会心得体会（Parents meeting experience） Discussion on setting of expansion joint of water stabilized base of Asphalt Concrete Pavement Liao Xiongwen Liu Fengyun (highway and Bridge Engineering Bureau of Jiangxi Province, Nanchang 330008) Abstract: in this paper, through the analysis of the causes of arching and cracking in some sections of the asphalt concrete pavement, the water stability of the pavement is put forward Measures and necessity of setting expansion joints during construction of base course. Key words: road engineering; asphalt concrete pavement; water stabilized base; expansion joint setting 0 Preface For a long time, in the design and construction of cement pavement, the practice of setting expansion joints has been clearly defined, and has been attached great importance in construction. However, in the asphalt concrete pavement water base construction, expansion joints or contraction joints are not considered in many places, and the specifications are not clearly stated. The temperature changes under the effect of pavement of semi-rigid base in no set expansion joints or joint cases there will be expansion arch and shrinkage cracking phenomenon caused by asphalt concrete pavement early local destruction is becoming more and more serious, the effect of driving comfort and safety, damaged the social image of highway. With the development of high-grade highway and the improvement of vehicle load grade, the requirement of flexible pavement base is more and more high. Therefore, the expansion of asphalt concrete pavement at the base of joints or contraction is urgent. Observation of 1 asphalt pavement camber disease Through the observation of has opened several highway use, especially in the summer for rare under high temperature, the June 28, 2003 opening of many sections of Changtai Expressway Asphalt Concrete Pavement arch, the arch height is about 10cm; there are a number of Zhanggao Chang speed bulge phenomenon of asphalt pavement in December 1997 openi