Research Article
Experimental Investigation on Use of Wheat Straw Ash and Bentonite in Self-Compacting Cementitious System
Table 1
Physical and chemical properties of powders.
| | Parameters | Cement (42.5R) | WSA | Bentonite (H) | Bentonite (R) |
| | Physical properties | | Mean particle size (μm) | 22.00 | 12.30 | 4.32 | 4.75 | | Surface area (cm2/g) | 1,650 | 3,200 | 4,800 | 2,535 | | Specific gravity | 3.10 | 2.30 | 2.79 | 2.82 | | Moisture content (%) | 2.90 | — | 0.05 | 3.20 |
| | Chemical analysis (%) | | SiO2 | 17.15 | 73.95 | 53.96 | 49.38 | | TiO2 | 0.32 | 1.92 | 0.93 | 1.85 | | Al2O3 | 5.60 | 0.91 | 20.27 | 17.54 | | Fe2O3 | 3.21 | 1.15 | 8.92 | 10.24 | | MgO | 1.44 | 1.83 | 4.02 | 3.80 | | CaO | 64.09 | 5.21 | 7.05 | 9.54 | | K2O | 1.19 | 11.51 | 3.93 | 4.83 |
| | Strength activity index (SAI) | | *7 days | 100 | 96 | 94 | 77.26 | | *28 days | 100 | 104 | 99 | 85.18 |
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SAI ≥75% of CEM (ASTM C618).
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