Development of basalt fiber chopped yarn for asphalt at home and abroad

As a new type of pavement material, fiber asphalt mixture has attracted extensive attention from scholars at home and abroad for its superior road performance. Many scholars have studied the performance of fiber asphalt mixture from various aspects and applied it to practical engineering. The results of the study consistently show that the addition of fiber in the asphalt mixture can improve the comprehensive road performance of the road surface. What's more important: the common asphalt mixture pavement has various road damages, and it has to be repaired for a long time. This has a very negative impact on transportation, and the resulting indirect economic loss is also impossible. Estimated. The appearance of fiber asphalt mixture paving materials has greatly reduced the indirect economic losses caused by road maintenance, which has provided an important guarantee for the steady improvement and sustainable development of the national economy. Because of the many advantages of fiber asphalt mixture pavement, it has received more and more attention and research, and has a great space for promotion and use.

A section of the road in Haining, Zhejiang, uses basalt fiber reinforcement

The road-specific mineral fiber was first used in the United States in 1991. The first SMA asphalt pavement in the United States—the use of road-specific mineral fibers on the interstate of Georgia—has been a huge success. In recent years, there is a view in the United States that asphalt mixtures mixed with lignin fibers cannot be recycled. Mineral fibers (mostly basalt fibers) can be recycled in the same way as aggregates, so the amount of mineral fibers is greatly increased. Some states even It is stipulated that lignin fiber can no longer be used.

As a new type of building material with great development potential, basalt fiber products have a wide range of raw materials, low price and many other materials, as well as strong operability and designability. It is growing at an alarming rate abroad. Although it can not completely replace the traditional building materials - steel and concrete, it can be used as an important supplement to traditional building materials, and has become a research and application hotspot in the international civil engineering community in the 21st century, and has great promotion and use value.

The application of basalt fiber to asphalt concrete has been reported in related research and application in China. As for the application of mineral fiber, lignin fiber and polymer fiber in SMA, the feasibility of using mineral fiber on modified asphalt concrete pavement was put forward. Tian Ping and Ding Yongsheng of Hebei Province The AC-20C basalt fiber asphalt mixture was tested in rutting test, low temperature bending, water stability, water immersion Marshall, freeze-thaw splitting, etc., and the optimum oil-stone ratio of basalt fiber asphalt concrete corresponding to the project was 4.4%. . The Ministry of Communications industry standard "Technical Specifications for Highway Asphalt Pavement Construction" (JTG F40-2004) also clarifies in Article 4.11.1 that "the fiber stabilizers added to the asphalt mixture should be selected from lignin fibers, mineral fibers, etc. Mineral fibers should be made of ore such as basalt."

In the application of basalt fiber asphalt concrete engineering, the Daqing-Qiqihar Expressway has paved a total of 10 kilometers of test sections. The Pujiang pavement of Yiwu City, Zhejiang Province has paved a 5km asphalt concrete surface, and the Henan Zhixin Expressway asphalt concrete surface has been adopted. Basalt fiber asphalt concrete; about 500m basalt fiber asphalt concrete was paved on the pavement surface of Chengdu Chuanshan Road Reconstruction Project. The road surface of the left bank of Shahe in Chengdu was paved with a pavement surface of about 600m, and the Yangxi line of Chengdu was 9.4km. Taiyu Road in Jinzhong City and special coal transportation channel for Datong Second Power Plant.