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一、北京市近年来修建的黑色路面的早期损坏情况: 北京市近年来修建的黑色路面,早期损坏的现象比较严重,它的损坏形式,主要是路面使用期限不长,就出现开裂现象,而且逐渐扩展,最后形成不同程度的网裂或不规则裂纹,一九七八年对36个以砂石为基层的城区道路典型路段进行了调查,其中只有一段使用五年未出现裂缝,占2％,其他35个路段全都发生了裂缝,调查情况见表1。
I. Early Damage of Black Pavement Constructed in Beijing In recent years, the black pavement constructed in Beijing in recent years has been characterized by serious damage in the early stage. Its damage form is mainly caused by the phenomenon of cracking caused by the short period of pavement life, and Gradually expanded and finally formed different degrees of net crack or irregular crack. In 1978, 36 typical road sections of urban roads with gravel were surveyed. Only a period of five years without cracks occurred, accounting for 2% , All the other 35 sections of the cracks have occurred, the survey is shown in Table 1.