Environmental protection asphalt flame retardant effectiveness road reconstruction in disaster areas

The Wenchuan 8.0-magnitude earthquake caused serious damage to roads in Sichuan and other disaster-prone areas. It is in urgent need of various high-performance materials for reconstruction after the disaster. At present, a halogen-free, environmentally-friendly flame retardant for tunnels and roads in the mountainous areas of Yunnan, Guizhou, Sichuan, etc. is preparing to be widely promoted to the affected areas. The product not only solves the major problem of tunnel pavement asphalt construction, but also can help roads in the disaster area achieve safety, environmental protection and rapid reconstruction. This is the information that the reporter obtained from the 2008 China Flame Retardant Academic Annual Meeting held in Yichang, Hubei from May 19th to 21st.
Asphalt is a new type of paving material for tunnel pavement. Compared with concrete pavement, it has good stability, simple construction and convenient maintenance, and it is good for vehicles to maintain good driving performance. Therefore, it is a general trend to use asphalt for tunnel pavement construction. However, the burning of bitumen produces large amounts of smoke and gases harmful to the human body. The mountain tunnels are difficult to ventilate because of the difficulty of ventilation, and smoke and dust are difficult to discharge. Once a fire occurs, it can easily cause casualties. Therefore, asphalt pavements are rarely used in tunnels requiring high flame retardancy, especially in long tunnels, and most of them are cement concrete pavements, which greatly limits the application of asphalt. Therefore, it is of urgent practical significance to develop flame retardants for asphalt.
With people's increasing awareness of fire prevention, asphalt flame retardants with excellent flame retardant properties, environmental friendliness, and good cost performance have become the focus of research. What kind of flame retardant can be used not only can eliminate the hidden dangers of the asphalt fire accident in the tunnel, but also can retain the good road performance of the asphalt itself, which has become a topic for the flame retardant enterprises.
In order to meet the demand for asphalt flame retardants for road construction, Jiangsu Zhenjiang Star Flame Retardant Co., Ltd., which was the first high-polymerity APP (ammonium polyphosphate) flame retardant in China, was independently researched and developed since 2005. In the environment-friendly halogen-free asphalt flame retardant, nitrogen and phosphorus flame retardant has become its research and development direction. After a year of research and development, Star Flame Retardant has finally developed a halogen-free environmentally friendly flame retardant. The flame retardant can be decomposed by heat to produce non-combustible gas ammonia and metaphosphoric acid, so that the asphalt pavement expands and foams to form a sponge-like carbon foam layer, which plays a role of heat insulation, oxygen barrier, and smoke suppression, and prevents the generation of droplets. Phenomenon, with good flame retardant properties.
According to the manager of the company, Wang Guohua, adding the flame retardant will not affect the asphalt performance. The flame retardant product has been used in small-scale demonstrations for several years and has now begun to be widely promoted. If the product can be widely used on the tunnel pavement, it can help roads in the disaster area achieve safety, environmental protection and rapid reconstruction.