SELF COMPACTING CONCRETE

INTRODUCTION :  

Self compacting concrete is a fluid mixture designed to be used in structures with congested reinforcement.It consolidates under its own weight , so no vibration is required for compaction.

It is achieved by :

                  (1) Increasing the paste volume and W/C ratio,

                  (2) Reducing and controlling the volume of coarse aggregate,

                  (3) Use of Admixtures(Super-plasticizers)and/or powdered materials(Fly-ash,lime etc).

Self-compactibility is largely affected by the characteristic property of materials and mix proportions.Following generalized changes are to be done:

                             ->CA    -  29% of total volume,

                             -> FA    - 40% of Mortar volume,  

                             -> W/C - 0.9-1.1 (by volume),

                             -> SP    - 0.9-1% of binder weight.(necessary to obtain high mobility)

MIX PROPORTIONING :

MATERIALS USED:

             1) Binder - OPC -43 grade

             2) Mineral Admixture- Fly-ash(Gs-2.12)

             3) Coarse Aggregate- 16mm&12.5mm(60:40) as per IS-2386 

             4)Fine Aggregate- Natural River Sand

             5) Chemical Admixture- Sika Viscocrete 10R3

For mix design refer the  link

TEST METHODS :

               [1] V-FUNNEL TEST

               [2] L-BOX TEST

l-box apparatus

SLXL

v-funnel apparatus