SELF COMPACTING CONCRETE

 

1. GENERAL :-

Self compacting concrete is a concrete that fills uniformly and completely every corner of form work  by its own weight without application of any vibration, without segregation, whilst maintaining homogeneity.

                                

2. APPLICATION AREA :-

Self compacting concrete may be used in precast concrete application or for concrete placed on site. It may be manufactured in a site batching plant or in a ready-mixed concrete plant and delivered to site by truck mixer. It may then be placed either by pumping or pouring into horizontal or vertical forms.

                                      

3. FEATURES OF FRESH SELF COMPACTING CONCRETE :-

The following are some of the features of self compacting concrete :-

a) Slump flow : 600 mm Min.

                      

b) Sufficient amount of fines (<0.125 mm) preferably in the range of 400 kg/cumec . This can be achieved by having sand content more than 38 % and using mineral admixture to the order of 25% to 50% by mass of cementitious materials.

c) Use of high range water reducing (HRWR) admixture and viscosity modifying agent (VMA) in appropriate dosages.

               

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