Page 163 - Water Standards
P. 163

and may be set to 1   2⁃1   5  
                             4) An asphaltic mixture should be compacted by vibrating
                                 rollers. It may be compacted statically for 1⁃2 times, and
                                 then compacted vibrationally. For channel slope compac⁃
                                 tion, vibration shall be carried out when travelling up⁃
                                 wards, and not vibrating when travelling downwards.
                                 Compaction shall be carried out according to compacting
                                 temperature  and  times  determined  by  test, and
                                 compaction shall not be missed out.
                             5) For places where an anti⁃seepage layer is connected with
                                 structures and which are difficult to compact with ma⁃
                                 chinery, compaction shall be supplemented by manual
                                 work.
                             6) Asphaltic concrete anti⁃seepage layers shall be paved con⁃
                                 tinuously to reduce cold joints.
                             7) If a two⁃layer paving method is employed, joint surfaces
                                 shall be dry and clean, and a thin layer of warm or at⁃
                                 tenuated asphalt shall be uniformly brushed on. The
                                                                       2
                                 brushing quantity shall not exceed 1kg / m    The cold
                                 joint sites of the upper and lower layers shall be stag⁃
                                 gered.
                             8) During construction, proper treatment shall be employed
                                 to prevent segregation and over cooling of the mixture.
                           3  Brushing of seal coatings shall meet the following require⁃
                       ments:
                             1) Asphaltic mastic shall be brushed on a clean and dry anti⁃
                                seepage layer, and the thickness of the brushing layer
                                shall be uniform. The brushing quantity should be 2-3kg /
                                  2
                                m    During brushing, the temperature of asphaltic mastic
                                shall not be less than 160℃.
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