Self- Compacting Concrete-2

Materials Used in SCC:-

  Cement:

    Ordinary Portland cement (Grade 43) was used. Its physical properties are as given in Table 1.

Fly ash:-

     Class F Fly ash obtained from “Panipat Thermal Power Station, Haryana, India. The physical and chemical properties of fly ash are given in the Table 2 and Table 3, respectively.

Table 1. Physical Properties of Cement

Physical property	Results obtained	IS: 8112-1989 [4] specifications
Fineness (retained on 90-μm sieve)	8.0	10mm
Normal Consistency	28%	-
Vicat initial setting time (minutes)	75	30 minm
Vicat final setting time (minutes)	215	600 maxm
Compressive strength 3-days (MPa)	23	22.0 minm
Compressive strength 7-days (MPa)	36	33.0 minm
Compressive strength 28days(MPa)	45	43.0 minm
Specific gravity	3.15	-

                                               Table 2. Physical Properties of Fly Ash

Sr. No.	Physical Properties	Test Results
1.	Colour	Grey (Blackish)
2.	Specific Gravity	2.13
3.	Lime Reactivity -average compressive strength after 28 days of mixture ‘A’	4.90 MPa

          Table 3. Chemical Properties of Fly Ash

Sr. No.	Constituents	Percent by Weight
1.	Loss on ignition	4.17
2.	Silica (SiO2)	58.55
3.	Iron Oxide (Fe2 O3)	3.44
4.	Alumina (Al2 O3)	28.20
5.	Calcium Oxide (CaO)	2.23
6.	Magnesium Oxide (MgO)	0.32
7.	Total Sulphur (SO3)	0.07
8.	Insoluble residue	-
9.	Alkalies a) Sodium Oxide (Na2O) b) Potassium Oxide (K2O)	0.58 1.26

The properties of fly ash conform to IS: 3812-2003.

Admixtures:-

    A polycarboxylic ether based superplasticizer complying with ASTM C-494 type F, was used.

Aggregates:-

Locally available natural sand with 4.75 mm maximum size was used as fine aggregate, having specific gravity, fineness modulus and unit weight as given in Table 4 and crushed stone with 16mm maximum size having specific gravity, fineness modulus and unit weight as given in Table 4 was used as coarse aggregate. Both fine aggregate and coarse aggregate conformed to Indian Standard Specifications IS: 383-1970 [6]. Table 4 gives the physical properties of the coarse and fine aggregates.

Table 4. Physical Properties of Coarse and Fine Aggregates

Physical tests	Coarse aggregate	Fine aggregate
Specific gravity	2.67	2.66
Fineness modulus	6.86	2.32
Bulk density (kg/m3)	1540	1780

                                             

                                           Table 5. Chemical Properties of Fly Ash

Sr. No.	Constituents	Percent by Weight
1.	Loss on ignition	4.17
2.	Silica (SiO2)	58.55
3.	Iron Oxide (Fe2 O3)	3.44
4.	Alumina (Al2 O3)	28.20
5.	Calcium Oxide (CaO)	2.23
6.	Magnesium Oxide (MgO)	0.32
7.	Total Sulphur (SO3)	0.07
8.	Insoluble residue	-
9.	Alkalies a) Sodium Oxide (Na2O) b) Potassium Oxide (K2O)	0.58 1.26