Plenty of waste residue was produced in the process of strontium carbonate refining, which occupies land and affects the environment severely. With some activity, strontium slag can be used to build road pavement. In this paper, the physical characteristics of strontium slag were analyzed first. Then a reasonable mix proportion of strontium slag cement concrete for low traffic volume road pavement was achieved. Finally, the strength and elastic modulus of the strontium slag cement concrete specimen were tested. Test road of strontium slag cement concrete pavement was build at rural area in Chongqing, China. Long-term performance observation of test road has proved that strontium slag cement concrete pavement can be used widely in low traffic volume road.

Understanding the interaction between pavements and the ambient temperature is critical for mitigating urban heat islands. The objective of this paper is to investigate the variation of heat flux from different pavement materials based on a field experiment in Ningbo, China. One-year observation, including total surface solar radiation, reflective radiation and net total radiation, are analyzed. Quantitative variations of the heat flux are then determined using energy balance theory. Results show that the average daily heat flux (Q_d) of asphalt pavements is higher than that of concrete pavements. Seasonally, summer has a larger Q_d than spring has, and winter has the smallest Q_d. On average, the daily heat flux varies from 4 to 12 W/m². Weather condition influences heat flux. Ranking from the maximum to the minimum are clear days (11.8 W/m²), cloudy days (7.9 W/m²), and rainy days (4.2 W/m²).

This study examined the foaming characteristics of asphalt and their effects on the performance of cold recycled mixtures. The expansion ratio and half-life were used to evaluate effects of asphalt type, foaming temperature, and water content. The influence of asphalt content, gradation, cement content, curing time, and mixing water on mechanical properties and water stability was analyzed. The results indicate that asphalt type is the key factor affecting foaming performance. CNOOA asphalt showed optimal foaming at 160 °C with 2% water, achieving an expansion ratio of 27 and a half-life over 30 s. Optimal asphalt contents for gradations A and B are 3.5% and 2.5%, respectively. A 1.5% cement content provides the best performance balance. Dry and wet indirect tensile strengths increased by 91.18% and 205.56% after 3-day curing. The optimal mixing water ranges are 60–90% and 70–80% of optimum moisture content for gradations A and B. Curing time has the most significant influence on performance, followed by cement and asphalt content. This study provides a theoretical basis for optimizing foamed asphalt cold recycling.