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| fabwiki:research:canada:delijani:chapter_6 [2018/05/08 18:23] – external edit 127.0.0.1 | fabwiki:research:canada:delijani:chapter_6 [2023/10/19 15:16] (current) – [See Also] rpschmitz |
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| ==== Summary ==== | ==== Summary ==== |
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| <align justify><fs medium>This thesis investigated the structural behaviour of fabric formed concrete. At the beginning comparison tests on small cylinders revealed that fabric formwork cast normal concrete can gain 13 to 17% strength, while flyash concrete gained 13 to 16% at 28 days. These strength gains had no effect on the ultimate strength observed in full size column tests.</fs></align> | ### |
| | <fs medium>This thesis investigated the structural behavior of fabric formed concrete. At the beginning comparison tests on small cylinders revealed that fabric formwork cast normal concrete can gain 13 to 17% strength, while flyash concrete gained 13 to 16% at 28 days. These strength gains had no effect on the ultimate strength observed in full size column tests.</fs> |
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| <align justify><fs medium>As you increase diameter, area will grow much faster than the circumference will (Figure 69). The larger the diameter of the column, the less effect circumferential bleeding will proportionally have on the structural area of the column. Figure 70 shows the comparison between the affected perimeter concrete areas due to fabric formwork to the total sectional area in specimens with different diameters.</fs></align> | ### |
| | <fs medium>As you increase diameter, area will grow much faster than the circumference will (Figure 69). The larger the diameter of the column, the less effect circumferential bleeding will proportionally have on the structural area of the column. Figure 70 shows the comparison between the affected perimeter concrete areas due to fabric formwork to the total sectional area in specimens with different diameters.</fs> |
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| <align justify><fs medium>Since the depth effect of fabric formwork on concrete quality is not dependent on the diameter, the ratio of the affected area to the whole sectional area of the specimen is a definitive factor. As seen in the Figure 70, the larger the area of the member, the smaller the ratio of perimeter over area is. The smaller this ratio is the less effect the fabric formwork has on a member’s concrete strength. This has been confirmed by cylinder and column tests in this thesis.</fs></align> | ### |
| | <fs medium>Since the depth effect of fabric formwork on concrete quality is not dependent on the diameter, the ratio of the affected area to the whole sectional area of the specimen is a definitive factor. As seen in the Figure 70, the larger the area of the member, the smaller the ratio of perimeter over area is. The smaller this ratio is the less effect the fabric formwork has on a member’s concrete strength. This has been confirmed by cylinder and column tests in this thesis.</fs> |
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| | <fs medium>The smaller 101 by 203 mm (4 by 8 in.) fabric formed cylinders proved to gain an average of 15% extra compressive strength comparing to the conventionally molded control samples while some preliminary tests showed that 152 by 305mm (6 by 12 in.) cylinders gain an average of 10.3% extra compressive strength. The 254 mm (10 in.) diameter fabric formed flyash concrete column gained an extra 5% compressive strength compared to cardboard formed flyash column. In case of columns FF-NC-2 and CT-NC-2, the strength of fabric formed normal concrete column was decreased by 2% compared to cardboard tube formed column. A comparison of the test results shows that the growth in overall compressive strength in a concrete column due to fabric formwork diminishes as the diameter of the column increases.</fs> |
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| <align justify><fs medium>The smaller 101 by 203 mm (4 by 8 in.) fabric formed cylinders proved to gain an average of 15% extra compressive strength comparing to the conventionally molded control samples while some preliminary tests showed that 152 by 305mm (6 by 12 in.) cylinders gain an average of 10.3% extra compressive strength. The 254 mm (10 in.) diameter fabric formed flyash concrete column gained an extra 5% compressive strength compared to cardboard formed flyash column. In case of columns FF-NC-2 and CT-NC-2, the strength of fabric formed normal concrete column was decreased by 2% compared to cardboard tube formed column. A comparison of the test results shows that the growth in overall compressive strength in a concrete column due to fabric formwork diminishes as the diameter of the column increases.</fs></align> | |
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| {{gallery> fabwiki:research:canada:delijani:fig_69-70?300x200&2&showtitle&lightbox }} | {{gallery> fabwiki:research:canada:delijani:fig_69-70?300x200&2&showtitle&lightbox }} |
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| ==== Conclusions ==== | ==== Conclusions ==== |
| - <fs medium>Even though fabric formed cylinder tests showed an average of 15% increase in compressive strength of the fabric formed reinforced columns did not change appreciably when compared to the companion cardboard formed control columns. The reason would be the fact that the ratio of the affected concrete area due to fabric formwork, reduces as the diameter of the specimen increases. Therefore, fabric formwork does not increase the overall compressive strength of a large/thick concrete member. Furthermore, compression failure in columns occurs at the top, where bleeding effect and strength advantage are minimum due to minimal hydrostatic pressure. Ultimately, it can be concluded that fabric formwork is structurally safe alternative for forming reinforced concrete columns.</fs> | - <fs medium>Even though fabric formed cylinder tests showed an average of 15% increase in compressive strength of the fabric formed reinforced columns did not change appreciably when compared to the companion cardboard formed control columns. The reason would be the fact that the ratio of the affected concrete area due to fabric formwork, reduces as the diameter of the specimen increases. Therefore, fabric formwork does not increase the overall compressive strength of a large/thick concrete member. Furthermore, compression failure in columns occurs at the top, where bleeding effect and strength advantage are minimum due to minimal hydrostatic pressure. Ultimately, it can be concluded that fabric formwork is structurally safe alternative for forming reinforced concrete columns.</fs> |
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| ==== Suggestions for Future Studies ==== | ==== Suggestions for Future Studies ==== |
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| <fs medium>//Place text here.//</fs> | <fs medium>//Place text here.//</fs> |
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