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℃.
1 5 6