The paper introduced the method of Density Meter on Road Bed and its defaults, based on the practical situation of China and demonstrated the essential functions of our proper-right general situation and development of Density-Meter system.

By actual examples,the article introduces a new technology in situ measurement of the roadbed compaction density--the additional mass method,and introduces in detail its theory,method and technology,instruments and equipment and its testing results.

Study on the relationship between compact density and compaction energy of CuCr alloys by explosive compaction;

Through analysis on the construction technics and equipment capability of asphalt pavement , the paper points out the respective deviation reasons between the design homogeneity and actual homogeneity of aggregate,temperature and compact density in the asphalt pavement construction.