WHAT IS SELF CONSOLIDATING CONCRETE
The Self-consolidating concrete has the high ability to fill and flow through heavy reinforcement areas under its weight, as we mentioned early.
The S.C.C. has slightly similar cement binders and water-cement ratios as compared to the ordinary concrete mix. The S.C.C. gives us a slightly higher strength because, without using the vibrator at the concrete pouring time, it will improve the bond between the concrete Hardened paste and Aggregates.
The Self-consolidating concrete can be poured into the slabs or in columns more than the height of 5 m because, in S.C.C., the segregation of aggregate will not occur thanks to its design. As a result, the S.C.C. concrete can be poured fast compared to the regular concrete pouring time.
MATERIAL USE IN SELF CONSOLIDATING CONCRETE:
The Self-consolidating concrete S.C.C. has different physical properties as compared to the regular concretes.
Cement.
In S.C.C. concrete, the cement Grade 43 is used. The Physical properties of cement must meet according to I.S.: 8112.
| Physical property | Ratios |
| Fineness (Cement will retain on 90-mm sieve) | 8-10 mm |
| Normal Consistency | 28% |
| Initial setting time (minutes) | 75 (30 Min) |
| final setting time (minutes) | 215 (600 Max) |
| Crushing strength 3-days later | 23 MPa (22 Min) |
| Crushing strength 7-days later | 36 MPa (33 Min) |
| Crushing strength 28 days later | 45 MPa (43 Min) |
Aggregates.
The Fine aggregates use in concrete must have 4.75 mm maximum in size, and the coarse aggregate also called crushed stone, has a 16 mm maximum size. The fine and coarse aggregate must be according to IS: 383-1970.
| Physical tests | Coarse aggregate | Fine aggregate |
| Specific gravity | 2.67 | 2.66 |
| Fineness modulus | 6.86 | 2.32 |
| Bulk density | 1540 (kg/m3) | 1780 (kg/m3) |
ADVANTAGES:
- S.C.C concrete always consolidates under its weight.
- Water reduction.
- Simple and easy placing.
- Excellent flow even around heavy reinforcement areas.
- Better finishing receive.
- Having high strength.
- Having a consistent Flow and Slump.
- Significantly reduce labour or equipment costs.
- Reduce time of placing concrete.
- Less concrete quantity consumption as we compare to the normal concrete consumption.