Research Article
Bloating Mechanism of Lightweight Aggregates due to Ramping Rate
Table 4
Bulk density and microstructure with ramping rate.
| | No. | Firing conditions | Heating rate (°C/min) | Bulk density (g/m3) | Water absorption ratio (%) | Microstructure image of cross section | Bloating mechanism |
| | A | 600°C + 1180°C 10 min. | 72 | 1.72 | 4.1 | | Black core | | B | 700°C + 1180°C 10 min. | 69 | 1.75 | 3.8 | | Black core | | C | 800°C + 1180°C 10 min. | 67 | 1.7 | 4.1 | | Black core | | D | 900°C + 1180°C 10 min. | 64 | 1.51 | 5.1 | | Black core | | E | 900°C + 1180°C 20 min. | 35 | 1.53 | 5.2 | | Black core | | F | 600°C + 1180°C 30 min. | 27 | 1.53 | 2.5 | | Micropore | | G | 700°C + 1180°C 30 min. | 26 | 1.52 | 2.7 | | Micropore | | H | 800°C + 1180°C 30 min. | 25 | 1.51 | 2.1 | | Micropore | | I | 300∼1180°C normal sintering 40 min. | 25 | 1.3 | 1.8 | | Micropore | | J | 300∼1180°C normal sintering 60 min. | 16 | 1.32 | 1.7 | | Micropore |
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