... polyacrylonitrile fiber can be used in the cement concrete to prevent crack of it Copolymer Acrylonitrile FiberThe ... the aggregate, the asphalt membrane is enlarged, makes for slowing down the ageing rate, further prolong the ... the aggregate, the asphalt membrane is enlarged, makes for slowing down the ageing rate, further prolong the ... decrease the crack. Copolymer Acrylonitrile Fiber(for cement concrete)