Page 162 - Water Standards
P. 162

shall be fully filled in mortar, tamped solidly, pressed
                                 smoothly, and trowelled.
                             3) Precast slabs shall not be laid until the foundation trench
                                 has been excavated and the foundation stone has been in⁃
                                 stalled. For channels with soil slopes, the space between
                                 a precast slab and the soil slope should be filled solidly
                                 with sand or loam during masonry. For channels with stone
                                 slopes, the space between a precast slab and the stone
                                 slope should be filled solidly with mortar or concrete
                                 during masonry. The top precast slabs shall be filled
                                 smoothly with mortar, and then a sealing capstone shall
                                 be installed.
                       3   4   8  Membrane anti⁃seepage shall be constructed according to the
                       relevant requirements in SL/ T 231  
                       3   4   9  Asphaltic concrete anti⁃seepage shall meet the following re⁃
                       quirements:
                           1  Asphaltic mixtures shall be mixed according to the selected
                       mix proportion of asphaltic concrete.
                           2  In⁃situ paving construction shall meet the following require⁃
                       ments:
                              1 ) For anti⁃seepage structures with leveling cementation
                                 layers, the leveling cementation layer may be paved
                                 first, and then the anti⁃seepage layer shall be paved.
                             2) Heat preservation measures shall be employed for transpor⁃
                                 tation tools for asphaltic mixtures to ensure the in⁃situ
                                 temperature of the asphaltic mixture is not lower than the
                                 paving control temperature.
                             3) Anti⁃seepage layers shall be paved uniformly according to
                                 the paving thickness determined by in⁃situ tests. The
                                 compaction coefficient should be determined by tests,
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