When the free water that penetrates the internal surface can't be discharged in time, the asphalt and cement concrete pavement may suffer water damage. Then pavement is damaged severely.
当自由水渗入路面内部不能及时排出时，沥青和水泥混凝土路面都可能出现水损害，结果导致路面严重破坏。
SAF stress absorbing layer has very good ability to resist reflective cracks. Because of its air-free and little water permeability, it can decrease the damage caused by water in the pavement.
SAF应力吸收层系统具有良好的抗反射裂缝能力，混合料密实、透水性小，可以减少路面水损坏的产生，用该结构可以有效解决旧路加铺时反射裂缝的产生。
We guarantee one-year free of charge maintain for all our buildings and works, but man-made damage, natural force majeure, such as underground water and original floor etc.
公司所有设计和施工的地坪实行一年免费维修服务(人为因素和自然不可抗拒的原因如地下水，原地板变异除外)。
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