It analyses the producing reasons which cause some kinds of outer quality problems including concrete surface cracks,surface damage,surface uneven color and surface leaking tendon,and elaborates different effective factors,points out measures of improving,in order to improve the outer quality of concrete.

This paper proposed a branching-cutting search algorithm for solving the defective plane covered by k-L squared covers problem.

Positioning method in pavement surface distress detecting system;

Study of asphalt pavement surface distress image segmentation;

Study of pavement surface distress image binarization;

Based on the fatigue theory about flexible pavement design, tolerance tensile stress as a control index, the paper analyses the relations among pavement distress, traffic load and pavement use age by possibility to analyse and forecast the pavement performence.

The paper focuses on the application of cluster analytic method for pavement distress detection.

The traditional manual methods can t meet the needs of pavement distress detection now, because they have the following shortcomings such as time-consuming, non-precision, dangerous, costly and also affecting transportation.