The quality of asphalt mixture greatly affects the pavement quality, so how to ensure the quality of asphalt mixture has become the focus of many asphalt concrete mixing plants. Now, Jinan asphalt manufacturer will explain it to you.
1、 Improve asphalt quality: asphalt maintenance
It shall be selected according to different highway grades, climatic conditions, pavement types and traffic volumes. Asphalt with high viscosity should be selected for pavement with high temperature, high speed, heavy load and long slope in summer. On the contrary, asphalt with low viscosity can be selected for pavement with cold climate and small traffic volume.
Each batch of asphalt shall be sampled and inspected according to the technical specifications to ensure the quality. For asphalt management, attention shall be paid to storing asphalt from different sources separately and not mixing them to prevent pollution; The storage temperature shall not be higher than 170 ℃ and not lower than 150 ℃ during the construction period; Long term storage shall be conducted at low temperature.
2、 Asphalt quality improvement: aggregate
Aggregate is the skeleton of asphalt concrete and the main factor affecting the strength of asphalt concrete. In the process of material selection, attention should be paid to reducing the variability of aggregate grading, and the key screen hole for controlling aggregate grading should be set as the controlled screen hole of the crusher, so as to ensure the stability of aggregate grading.
Care shall be taken not to use needle shaped aggregates. The mud content of aggregate will also affect the adhesion between aggregate and asphalt and the stability of the mixture. Therefore, before mixing the mixture, the aggregates containing mud should be cleaned, and the aggregates stacked in the stock yard should be covered to prevent dust pollution.
3、 Improve asphalt quality: mineral powder
Mineral powder plays an important role in the aggregate cementation of asphalt mixture, rather than simply filling. With the same asphalt content, the greater the surface area of mineral aggregate, the thinner the asphalt film formed, the greater the proportion of structural asphalt, and the stronger the cohesion of asphalt mixture. The mineral powder must be the mineral powder ground by the strong basic rock in limestone or magmatic rock. Before processing, ensure that the clay of the raw stone is removed, and pay attention to waterproof and moisture-proof during storage.
4、 Improve asphalt quality: mixing temperature control
If the mixture temperature is too low, the paving and rolling quality will be affected, resulting in uneven mixing and rolling difficulties. Generally, the mixing temperature of hot mix asphalt mixture should be 130~160 ℃.
The mixing temperature of modified asphalt should be 10~20 ℃ higher than that of ordinary asphalt mixture, the temperature drop of modified asphalt mixture during storage should be less than 10 ℃, the temperature of aggregate should be 10~30 ℃ higher than that of asphalt, and the storage time in the storage bin should not exceed 72 hours.
The above is the answer to the four methods to improve the quality of asphalt mixture. If you have any ideas or questions, please come to our website http://www.ycgjglcl.com Consult!