Research Article
Evaluation of the Performance and Microstructure of Ecofriendly Construction Bricks Made with Fly Ash and Residual Rice Husk Ash
Table 4
FTIR characteristic bands identified in the FA and RHA powders and brick specimens shown in Figure
8.
| Band | FA (cm−1) | RHA (cm−1) | P35U00 (cm−1) | P35U10 (cm−1) | P35U20 (cm−1) | P35U30 (cm−1) | P35U40 (cm−1) | Characteristic bands |
| A | 3412 | 3447 | 3464 | 3466 | 3466 | 3466 | 3464 | O–H stretching (H2O) [24, 26, 27] | B | 1620 | 1611 | 1692 | 1692 | 1692 | 1692 | 1690 | O–H bending (H2O) [24, 26, 27] | C | — | — | 1462 | 1464 | 1462 | 1462 | 1462 | Si–O/Al–O stretching [24, 26] | D | 1096 | 1096 | 1078 | 1084 | 1086 | 1088 | 1091 | Si–O/Al–O stretching [24, 27, 28] | E | 795 | 791 | 779 | 779 | 791 | 791 | 789 | Si–O–Si stretching quartz [26, 28] | F | — | 621 | 619 | 621 | 619 | 619 | 619 | Zeolites [26, 28] | G | 459 | 473 | 465 | 465 | 469 | 471 | 471 | O–Si–O bending (SiO4) [24, 27, 28] |
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