Test details | Specimen details | Age (days) | Total for (1 mix) | Total (5 mixes) | |||
---|---|---|---|---|---|---|---|
3 | 7 | 28 | 56 | ||||
Compressive strength | Cubes (150 × 150 x 150 mm) | 3 | 3 | 3 | 3 | 12 | 60 |
Split cylinder test | Cylinders (150 mm high × 300 mm dia.) | 3 | 3 | 3 | 3 | 12 | 60 |
Flexural strength test | Beams (100 × 100 × 500 mm) | - | - | 3 | - | 3 | 15 |
Water permeability test | Cube (96.8 mm × 96.8 mm × 150 mm) | - | - | 3 | 3 | 6 | 240 (48 for each mix) |
Cube (146.9 mm × 146.9 mm × 150 mm) | - | - | 3 | 3 | 6 | ||
Cylinder (96.8 mm high × 150 mm diameter) | - | - | 3 | 3 | 6 | ||
Cylinder (146.9 mm high × 150 mm diameter) | - | - | 3 | 3 | 6 |
Items | Quantity of concrete | Quantity of cement | Quantity of RHA (6%) | Quantity of fine aggregates | Quantity of coarse aggregates | |
---|---|---|---|---|---|---|
Weight of materials | Raw concrete | 1 m3 (35.31 cft) |
8.62 cft |
--- | 15.73 cft |
31.47 cft |
Blended concrete | 1 m3 (35.31 cft) |
8.10 cft |
1.38 cft |
15.73 cft |
31.47 cft |
|
Cost of materials | Raw concrete | USD 21.57/- | USD 13.80/- | --- | USD 2.0/- | USD 5.77/- |
Blended concrete | USD 21.09/- | USD 12.97/- | USD 0.35/- | USD 2.0/- | USD 5.77/- | |
Difference in cost | USD 0.47/- (2.2% of normal concrete) | USD 0.82/- (6% of pure cement) | --- | --- | --- |
Mixture No: | Mixture Type | Water (kg) | OPC (kg) | Rice Husk Ash (kg) | Sand (kg) | Coarse Aggregates (kg) | Slump flow (mm) |
---|---|---|---|---|---|---|---|
OPC | 33.10 | 55.17 | 0 | 111.42 | 222.86 | 95 | |
6% Replacement | 33.10 | 51.84 | 3.31 | 111.42 | 222.86 | 105 | |
12% Replacement | 33.10 | 48.55 | 6.62 | 111.42 | 222.86 | 112 | |
18% Replacement | 33.10 | 45.24 | 9.93 | 111.42 | 222.86 | 123 | |
24% Replacement | 33.10 | 41.93 | 13.24 | 111.42 | 222.86 | 135 | |
Split cylinder strength activity index | ||||||||
---|---|---|---|---|---|---|---|---|
Ratio | 3 Days | 7 Days | 28 Days | 56 Days | ||||
Split cylinder strength (MPa) | S.A.I | Split cylinder strength (MPa) | S.A.I | Split cylinder strength (MPa) | S.A.I | Split cylinder strength (MPa) | S.A.I | |
0% | 0.953 | 100.0 | 1.179 | 100.0 | 1.891 | 100.0 | 3.358 | 100.0 |
6% | 1.000 | 105.0 | 1.281 | 108.7 | 2.124 | 112.3 | 3.563 | 106.1 |
12% | 0.863 | 90.6 | 1.014 | 86.0 | 1.275 | 67.4 | 3.049 | 90.8 |
18% | 0.884 | 92.8 | 0.932 | 79.1 | 1.597 | 84.4 | 2.844 | 84.7 |
24% | 0.836 | 87.8 | 0.891 | 75.6 | 1.329 | 70.3 | 2.570 | 76.5 |
Strength Activity Index | ||||||||
---|---|---|---|---|---|---|---|---|
Ratio | 3 Days | 7 Days | 28 Days | 56 Days | ||||
Compressive Strength (MPa) | S.A.I | Compressive strength (MPa) | S.A.I | Compressive strength (MPa) | S.A.I | Compressive strength (MPa) | S.A.I | |
0% | 3.229 | 100.0 | 6.932 | 100.0 | 13.563 | 100.0 | 23.251 | 100.0 |
6% | 3.380 | 104.7 | 7.535 | 108.7 | 14.640 | 107.9 | 25.404 | 109.3 |
12% | 3.294 | 102.0 | 6.050 | 87.3 | 13.090 | 96.5 | 21.744 | 93.5 |
18% | 2.885 | 89.3 | 5.813 | 83.9 | 12.056 | 88.9 | 20.022 | 86.1 |
24% | 2.583 | 80.0 | 5.425 | 78.3 | 11.303 | 83.3 | 17.438 | 75.0 |
Chemical composition (%) | OPC | RHA |
---|---|---|
Silicon dioxide (SiO2) | 22.0 | 77.34 |
Aluminum oxide (Al2O3) | 5.50 | 6.92 |
Ferric oxide (Fe2O3) | 3.50 | 4.89 |
Calcium oxide (CaO) | 64.25 | 3.56 |
Magnesium oxide (MgO) | 2.50 | 1.59 |
Sulfur trioxide (SO3) | 2.90 | 0.34 |
Sodium oxide (Na2O) | 0.20 | 1.27 |
Potassium Oxide (K2O) | 1.00 | 2.69 |
Loss on ignition | 0.64 | 4.81 |
Physical properties | ||
Specific gravity | 3.04 | 2.13 |
Specific surface (m2/kg) | 308 | 600 |
Compressive strength 3 days (MPa) | 20.76 | |
7 days | 31.89 | |
28 days | 39.41 | |
56 days | 42.52 | |
Consistency (%) | 29.25 | |
Initial Setting Time (min) | 110 | |
Final Setting Time (min) | 228 |