Through the analysis of different temperature crushed stone value, it is found that the specification required by asphalt aggregate selection method is not suitable for all materials. 3 kinds of aggregate are selected and make the crushed stone value test; the different temperature experimental results show that the crushed stone value at room temperature may be higher or lower than that at higher temperature. So, higher temperature crushed stone value are likely to pass or fail whatever normal crushed stone value is qualified or not. The relationships among crushed stone value of aggregate at different temperature and its water absorption, lithology and internal structure are discussed and analyzed in the paper to explain this phenomenon.

In recent years, nondestructive testing is applied more and more widely on the road detection, PQI as a kind of advanced testing equipment in asphalt pavement detection, it has been paid great attention by the road testing personnel. Based on the analysis of the densities which measured by PQI of different types of asphalt pavement, it sums up that the surface texture depth of asphalt pavement significantly affects the measuring accuracy of the density of PQI. In this paper, it suggests to use sand to fill the surface texture depth of asphalt pavement combining with PQI for pavement density measurement. Field testing shows that, compared with the bulk density of core sampling method, the density measured by PQI has obviously been affected by the surface texture depth of asphalt pavement. As the surface texture depth of the asphalt pavement is deeper, the error between the two methods is larger. Considering the influence of texture depth, the author improved the PQI detection method. The improved method shows that, compared with the bulk density of the core sampling, the coefficient of variation of the original testing method is 10.2%, and the new method is 3.8%. In the original testing method , it use the average value of the core sample densities as the compensation value of PQI measurement in the degree of compaction testing, and the maximum measurement error reached up to 2.2%. While, the improved testing method use the average value of the core sample densities as the compensation value of PQI measurement, the maximum measurement error reduces to 0.7%, the accuracy of the testing result is significantly improved.

The detecting precision is an important aspect of error control. The Standard scheduled the bituminous mixture type and water absorption level to improve detecting precision.The date statistical analyses of water absorbing capacity water absorption and air voids of practical project are made. The conclusion is that the dispersion of water absorbing capacity and water absorption is obvious because of the existence of discrete values. According the variability analysis of air voids distribution in different level and range of water absorption and different range of air voids, the detecting precision of air voids impacted by the water absorption and how to control the detecting precision of air voids in different water absorption of and air voids range were analyzed. The air voids at different water absorption level or in different water absorption range was preliminary predicted, and calculated the necessary sample numbers in different water absorption range or air voids range for different degree of detecting precision.

The growth rates of stress in the hexagon , square and octagon cement blocks under different vehicle loads were analyzed using the finite element method (FEM). The growth rate of bottom layer stress of the hexagon is the smallest among them when vehicle loads increase. Under the 400kN loads, the growth rate of bottom layer stress of the hexagon significantly reduced as the thickness increase. When its thickness is up to 28cm,the bottom layer stress is the smallest among the three kinds of shapes. The results show that the hexagon cement block is the most suitable for overload vehicles obviously when compared to the square and octagon cement block. Therefore, hexagon cement block is the most suitable for the roads which are always under heavy and overload vehicles .

Segregation is one of the important reasons that cause the early damage of asphalt pavement, so it is of great significance to discuss the standard for evaluating segregation to control quality of pavement during constructing. SMA-13 specimens of different gradation segregation and aggregate-asphalt segregation are designed to discuss the effects of different levels of segregation on air voids and bulk specific gravity of SMA-13 Marshall specimen. And the classification standards for gradation segregation are established based on the test data with reference to the air voids range that proposed by United States. In order to recognize the levels and site of segregation quickly and accurately in the entity project, the ratio of bulk specific gravity and the theoretical maximum specific gravity of standard grading, that is the evaluation standard of compactness, is put forward as the evaluation standard for segregation of SMA-13 asphalt pavement in field test.