Preparation of emery modified asphalt pre-paved waterproofing membrane
A modified asphalt waterproofing membrane used in pre-paving was prepared.High strength polyester tire was used as the matrix,and the maximum tensile force was not lower than 20 N/mm,and the elongation was not lower than 50％;the membrane was coated with molecular level self-adhesive adhesive from double sides,and the upper surface was an emery protection layer composed of silica crystals with a certain degree of activation after special treatment,and active chemicals were added to the self-adhesive adhesive materials.The waterproofing membrane product had the low-temperature flexibility of no cracking at-25 ℃,and the heat resistance performance of no slipping,flowing and dripping at 70 ℃.The puncture strength was not lower than 550 N,the nail shank tear strength was not lower than 300 N,and the peeling strength of the untreated and post-poured concrete was not lower than 1.7 N/mm,which showed good durability and corrosion resistance.The waterproofing membrane product had the impermeability of waterproofing for 0.3 MPa,120 min,and the dimensional change rate was between-0.7％and 0.7％,which could achieve the same life as the building,and was suitable for the underground building waterproof project with large settlement deformation and high vibration frequency.
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