Effect of Adding (SBR) on Concrete Properties and Bond Between Old and New Concrete

Mahdi Saleh Essa, Abeer Mohammed Abdul–Amir, Nada Flah Hassan


The  effect  of  adding  cempatch  SBR ( Styrene-  Butadiene – Rubber) emulsion to  the  following  was  studied:

   Cement  mortar  with  different  dosages of  SBR (  10 %,  25%,  35%  ) by volume of  water.  Compressive  strength  of  this  mortar  was  tested  at  ages  (  7,  28,  60  )  days.    Initial  and  final   setting  time  were  also  recorded.

   SBR also added to concrete  mix 1 : 2 : 4 with  0.45  water  to  cement  ratio  by  weight,  and  SBR  in  dosages  of  (  10 %,  2 5%,  35 %  )by  volume  of  water . Compressive strength  in  ages  (  7,  28,  60  )  days  was  tested,   also absorption,  slump  loss  with  time  and  flexural  strength  were  also  measured.

   And SBR  was  also  used  as  bonding  mortar  layer  between  old  and  new  concrete   layers, the compressive strength  and  flexural  strength of  bonded  samples were tested.    

       The results of adding SBR emulsion to cement  mortar  affects compressive   strength  negatively  at  all  age.  Initial  and  final  setting  time  decrease  with  increasing  the  dosage of  SBR.

The  using  of  SBR emulsion  as  admixture  for  concrete  mix  affects  compressive  strength  negatively at  early  ages  ( 7 days  )  and  positively  at  later  ages.   It  also  reduces;   the absorption  of  concrete  and  slump  loss  with  time  and increase  the flexural  strength.

The  use  of  SBR  as  bonding  layer  showed  increasing  in  compressive  and  flexural     strength  of  the  bonded  samples compared  with  samples  having  old  and  new  concrete  without  bond  layer.


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