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http://indianaquariumhobbyist.com/community/ :: View topic - Asphalt Pavement Cracks
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Asphalt Pavement Cracks

 
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PostPosted: Sun Sep 04, 2016 12:59 pm Post subject: Asphalt Pavement Cracks Reply with quote

 After  the  asphalt  pavement  construction,  often  have  different  degrees  of  cracks.  The  emergence  of  various  cracks  will  affect  the  quality  of  asphalt  pavement,  pavement  performance  to  shorten  the  life  and  impact  of  pavement.  As  the  saying  goes  "Wan  harm  water  for  the  first"  effective  Treatment  of  various  pavement  cracks,  preventing  the  cracks  along  the  road  surface  water  into  the  grassroots  level,  but  also  to  prevent  groundwater  into  cracks  along  the  road  surface,  can  significantly  extend  the  pavement  life.
 
 Causes  of  pavement  cracks  are  the  following.  1,  due  to  lack  of  overall  strength  of  asphalt  pavement  cracks  which  cause  the  rapid  destruction  of  the  road.  2,  due  to  asphalt  pavement  construction  defects  caused  by  cold  cracks  quickly  appeared.  3,  reflection  cracks  cement  stabilized  crushed  stone,  lime,  fly  ash  stabilized  crushed  stone  base  caused.  4,  due  to  the  aging  pavement,  aggregate  adhesion  between  natural  variation  and  the  formation  of  cracks.
 
 Use  of  relevant  theoretical  research  results,  the  calculations  show  that:  1.  In  Central  China,  North  China,  the  daily  temperature  of  15  ??  -20  ??,  the  road  surface  along  the  direction  of  maximum  tension  is  2-3Mpa  above.  2.  In  the  southern  region  of  China,  although  less  pavement  cracking  at  high  temperatures,  but  it  can  also  be  diurnal  temperature  reached  13-14  ??,  the  maximum  gravitational  pull  pavement  structure  may  also  produce  up  to  1.5MPa.
 
 And  on  the  fatigue  life  of  pavement  materials,  the  longer  duration  of  action,  namely  to  reduce  the  frequency,  the  shorter  life  expectancy.  When  the  temperature  is  high,  its  life  is  short,  that  is,  at  high  temperatures,  the  fatigue  effect  of  temperature  on  the  fatigue  life  of  more  serious  than  the  low  temperature.  Thermal  stress  analysis  results  indicate  that,  in  the  semi-rigid  base  asphalt  pavement,  temperature  stress  is  a  major  factor  leading  to  surface  cracking.  Is  cracking  down  progress  from  the  road  surface,  crack  goes  wide  and  narrow  form,  not  only  easy  to  produce  in  the  winter,  summer,  large  temperature  difference  between  day  will  lead  to  cracking  of  the  pavement  structure.
 
 
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