Water Cement Ratio Analysis

Table 1:

Grade of Concrete M60

Water cement ratio 0.36 ACI 211.4R

IS 456-2000 Table 5

Cement 450 Kg OPC 43 grade, IS 8112-1989

Fine Aggregate 730 Kg IS 383-1970

Coarse Aggregate

20mm

12mm

680 kg

450 kg IS 383-1970

Water 160 Litre

Mineral Admixture

Silica Fume @ 8% 36 Kg IS 456-2000 Cl,5.2.1.2

(5 to 10%)

Chemical Admixture

Hyper Plasticizer- CLASSIC SUPERFLOW PC 8860 @ 1% 4.5 Litre IS 456-2000,Cl,10.3.3

(0.5 to 2%)

Design Mix Proportions 1:1.62:2.51 ACI 211.4R

IV. EXPERIMENTAL PROGRAMME

A. Materials Chemical admixtures such as hyper-plasticizers (High range water reducer) increase concrete strength by reducing the mixing water requirement for a constant slump and by disbursing cement particles with or without a change in mixing water content permitting more efficient hydration. The main consideration of using hyper-Plasticizers in concrete is the high fines requirements for cohesiveness of the mix and rapid slump loss. The properties of hyper-plasticizers used are shown in Table 2.

Table 2:

HYPER PLASTICIZER (HP) – CLASSIC SUPERFLO PC 8860

1 Base Polycarboxylate ether polymer

2

The modulus of concrete under static loading conditions is generally known as its static modulus. The value of the static modulus E for concrete is determined on the basis of the uniaxial stress-strain curve obtained from a standard test cylinder. The stress-strain behaviour of HSC depends on material parameters such as aggregate type and experimental parameters that include age at testing, strain rate and interaction between specimen and testing machine. The stress-strain characteristics of concrete are non-linear from the beginning. The initial tangent to the stress-strain curve is regarded as the initial tangent modulus. The modulus of elasticity is determined from the slope of initial tangent drawn. The modulus of elasticity varies with the load level, as well as with the rate of