The preparation method of the product is the alkali soaking in asphalt, or soak in thermoplastic trimer (such as styrene butadiene - SBS) or thermoplastic (such as random polypropylene - APP, APAO APAL), modified organisms, and then cover double sided with elastomer (SBS) or thermoplastic (, APP, APAO APAL) modified asphalt, with fine sand, finally mineral SLATE (or soil) or polyethylene film, etc. The surface of the finished up.Then use fine sand or polyethylene film towards the bottom.
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