Road inorganic fiber

Product addition amount: should be determined according to the structure and performance requirements of the asphalt mixture. Usually, for SMA asphalt mixture, the addition amount is 0.3~0.5%, for OGFC asphalt mixture, the addition amount is 0.5%, and for AC asphalt mixture, the addition amount is 0.3~0.5%.

Application in SMA and OGFC asphalt mixture:

1. Prevent asphalt loss

In SMA and OGFC asphalt mixtures, since more coarse aggregates are used and more asphalt may be required, fiber must be added as a carrier of asphalt to prevent asphalt loss and increase the amount of asphalt. The test results show (Figure 1, 2) that Hebang Minerals basalt mineral fiber can effectively act as an asphalt carrier and prevent asphalt loss.

2. Improve the ability to resist rutting deformation at high temperatures

Test results (Figure 3-5) Hebang basalt mineral fiber can reduce the deformation rate of SMA asphalt mixture by 3 to 5 times. Although its effect is not as significant as that of the modifier, its role in improving the asphalt pavement’s ability to resist rutting deformation is Obvious.

3. Improve tensile properties and low-temperature crack resistance

Due to the reinforcing effect of fibers, fibers can greatly increase the tensile strength and toughness of asphalt mixtures, thereby significantly improving the low-temperature crack resistance of asphalt. Experiments show (Figure 6-8) that compared with other types of fibers, Hebang basalt mineral fibers have higher strength and better asphalt interface intrusion, so their role is particularly prominent.

Generally, Hebang basalt fiber can increase the tensile and cracking resistance of asphalt mixture by more than 50%. Therefore, adding Hebang mineral fiber is an effective means to solve the early water damage and pavement crack damage in asphalt.

4. Improve the water stability of asphalt pavement

Because Hebang basalt mineral fiber can significantly improve the tensile strength, toughness and crack resistance of asphalt mixtures, it can prevent moisture from intruding into the mixture and the asphalt-aggregate interface, avoid asphalt-aggregate peeling, and thus prevent early water damage in the asphalt. and improve water stability. In addition, Hebang basalt mineral fibers do not absorb water, which can prevent the fibers from becoming microchannels for moisture to invade the asphalt-aggregate interface.

5. Improve the anti-aging ability of asphalt mixtures

Aging tests show that Hebang basalt mineral fiber significantly reduces the aging of asphalt mixtures by about 20 to 40%. This is mainly due to the fact that fiber increases the amount of asphalt. Modified asphalt also slows down the aging of asphalt mixtures by about 0~20%

6. Improve the fatigue and service life of asphalt mixtures

Experimental results show (Table 1) that Hebang basalt mineral fiber can improve fatigue constant a by 2 to 3 orders of magnitude (about 80 to 400 times), obviously due to the effect of modified asphalt (about 60 times). Therefore, fiber is an effective means to improve the fatigue durability and service life of asphalt mixtures.

Application in AC asphalt mixture

AC asphalt mixtures do not require the addition of fibers as asphalt carriers or to prevent asphalt loss. However, in order to improve the performance of AC asphalt pavement and extend the life of the pavement, adding fiber is a very effective method.

The test results show (Table 2) that, like SMA and OGFC asphalt mixtures, Hebang basalt fiber can effectively improve the low-temperature crack resistance, high-temperature rutting deformation resistance, water stability and fatigue resistance of AC asphalt mixtures. , thereby greatly increasing the service life of the road surface.

It should be pointed out that Hebang basalt mineral fiber can significantly improve the crack resistance of asphalt pavement, which can be increased by more than 50% compared with other types of fibers. Relevant studies have shown that the early damage of asphalt pavement is closely related to the crack resistance of asphalt pavement. Adding Hebang basalt mineral fiber can improve the crack resistance of asphalt mixture and will become an important means to solve the problem of early water damage of asphalt pavement.