Cold recycling technology of old asphalt pavement is a relatively new technology which has important application in the road surface treatment. Combining with the application of the cold recycling technology in rural old asphalt pavement, this paper analyzes and elaborates its construction technology and experience approach. The existing old asphalt pavement material is used in accordance with the new design requirements to form a special pavement structure surface. On rolling forming sections, the test is conducted for compaction, smoothness, bending and sinking and drill-core sampling for compressive strength. The results show that this process meets the general requirements of pavement base, and the quality is good with the advantages of saving costs and reducing waste damaging the environment.

Slow-down dome is widely used in rural highway security engineering due to low cost, strong deceleration performance, good quality effect. The Subject conducts the research and discussion combined with the design principles, control points of construction technology, analysis of quality inspection and evaluation and analysis on safety effect of grouted stone highway l in the security engineering of ShangShui-Quan road. This provides references for the implementation of security engineering principles which is “Safe, effective, suit measures to local conditions”. In March 2012, the Ministry of transport of rural highway construction and maintenance management work conference put appeal about " let peasants go on road safety assured way, strengthen the rural highway security infrastructure ". In order to carry out the security engineering construction principles about conference proposed “safe, effective, economic, practical" rural road, Tianjin Municipal Highway Administration Bureau set up “the implementation of technical guidelines of Tianjin city rural highway traffic safety facilities” science and technology project research group to research demonstration. This paper conducts practice of argumentation combined with quality stability, practicality, operation process safety of Caigou Road security engineering being aimed at Belgium pavement; it provides technical supporting for the further promotion of the subject.

There is a wide range of saline soil distributied in China , 4.88% of the country's land can be used for salinization land.The salinization of soil in Tianjin area is 6614200 acres among them.The saline soil characteristics of collapsibillity, expansion, corrosion resistance are easy to make the roads salt cause expansion deformation, melting trap net crack and potholes, falling off and any other diseases, thus it is currently an urgent need to solve the problem of saline soil improved road in the salinization area of rural highway construction.Research group in the Green Meadow Depression saline soil application, applies the power plant fly ash resources based on the technology support analysis, obtains feasible technology application results.

Traffic signs are widely used in rural highway security engineering due to low cost, strong directive performance. The paper conducts the research and discussion combined with the design principles, control points of construction technology, analysis of quality inspection and evaluation and analysis on safety effect of traffic signs in the security engineering of Cai-Gou road. This paper provides references for the implementation of security engineering principles which is safe, effective, economic, practical.

This article has analyzed the main cause of cracks in the cement concrete pavement of county-highway and proposed some precautionary measures and disposition measures.The measures of cracks in cement concrete pavement mainly have pressure injection and grouting,expansion seam grouting,directly grouting,striped overlay and nozzle grouting.