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Effect of silica fume on durability of self-compacting concrete made with waste recycled concrete aggregates
https://orcid.org/0000-0001-8372-428X
https://orcid.org/0000-0002-7640-711X
Highlights Silica fume play an important role to improve durability performance. Silica fume decreased water absorption according to BS and ASTM standards. Recycled aggregates decreased UPV and ER in SCC mixtures. Silica fume increased significantly ER and chloride ion penetration resistance.
Abstract Due to adhered mortar in recycled concrete aggregates, some of the properties of concrete made with these types of aggregates, such as water absorption, porosity, electrical resistivity, and chloride ion penetration, may be affected. In this study, silica fume was used as a part of cementitious materials to improve the properties of self-compacting concrete (SCC), which were made with fine and coarse recycled aggregates. Three series of mixtures were made in the laboratory. In the first and second series, coarse recycled aggregates with replacement of 25%, 50%, 75% and 100% were used with and without silica fume. In the third series, 25% of fine recycled aggregates were replaced with fine natural aggregates. Slump flow and J-ring tests were considered for fresh state of SCC. The compressive strength, water absorption, ultrasonic pulse velocity, electrical resistivity, and chloride ion penetration tests were performed for hardened concrete. The use of silica fume improved the properties of fresh SCC. The results showed that silica fume can reduce water absorption and porosity. The silica fume showed that can resulted in a significant increase in electrical resistivity. On the other hand, the replacement of 25% of recycled aggregates did not have a significant effect on electrical resistivity, the electrical resistivity decreased by increasing the amount of replacement. Silica fume was very effective in controlling chloride ion penetration and reducing total charge passed. Silica fume also controlled the temperature of the solutions used during the test which indicates the control of the movement of ions in the penetration into concrete.
Effect of silica fume on durability of self-compacting concrete made with waste recycled concrete aggregates
https://orcid.org/0000-0001-8372-428X
https://orcid.org/0000-0002-7640-711X
Highlights Silica fume play an important role to improve durability performance. Silica fume decreased water absorption according to BS and ASTM standards. Recycled aggregates decreased UPV and ER in SCC mixtures. Silica fume increased significantly ER and chloride ion penetration resistance.
Abstract Due to adhered mortar in recycled concrete aggregates, some of the properties of concrete made with these types of aggregates, such as water absorption, porosity, electrical resistivity, and chloride ion penetration, may be affected. In this study, silica fume was used as a part of cementitious materials to improve the properties of self-compacting concrete (SCC), which were made with fine and coarse recycled aggregates. Three series of mixtures were made in the laboratory. In the first and second series, coarse recycled aggregates with replacement of 25%, 50%, 75% and 100% were used with and without silica fume. In the third series, 25% of fine recycled aggregates were replaced with fine natural aggregates. Slump flow and J-ring tests were considered for fresh state of SCC. The compressive strength, water absorption, ultrasonic pulse velocity, electrical resistivity, and chloride ion penetration tests were performed for hardened concrete. The use of silica fume improved the properties of fresh SCC. The results showed that silica fume can reduce water absorption and porosity. The silica fume showed that can resulted in a significant increase in electrical resistivity. On the other hand, the replacement of 25% of recycled aggregates did not have a significant effect on electrical resistivity, the electrical resistivity decreased by increasing the amount of replacement. Silica fume was very effective in controlling chloride ion penetration and reducing total charge passed. Silica fume also controlled the temperature of the solutions used during the test which indicates the control of the movement of ions in the penetration into concrete.
Effect of silica fume on durability of self-compacting concrete made with waste recycled concrete aggregates
https://orcid.org/0000-0001-8372-428X
https://orcid.org/0000-0002-7640-711X
Highlights Silica fume play an important role to improve durability performance. Silica fume decreased water absorption according to BS and ASTM standards. Recycled aggregates decreased UPV and ER in SCC mixtures. Silica fume increased significantly ER and chloride ion penetration resistance.
Abstract Due to adhered mortar in recycled concrete aggregates, some of the properties of concrete made with these types of aggregates, such as water absorption, porosity, electrical resistivity, and chloride ion penetration, may be affected. In this study, silica fume was used as a part of cementitious materials to improve the properties of self-compacting concrete (SCC), which were made with fine and coarse recycled aggregates. Three series of mixtures were made in the laboratory. In the first and second series, coarse recycled aggregates with replacement of 25%, 50%, 75% and 100% were used with and without silica fume. In the third series, 25% of fine recycled aggregates were replaced with fine natural aggregates. Slump flow and J-ring tests were considered for fresh state of SCC. The compressive strength, water absorption, ultrasonic pulse velocity, electrical resistivity, and chloride ion penetration tests were performed for hardened concrete. The use of silica fume improved the properties of fresh SCC. The results showed that silica fume can reduce water absorption and porosity. The silica fume showed that can resulted in a significant increase in electrical resistivity. On the other hand, the replacement of 25% of recycled aggregates did not have a significant effect on electrical resistivity, the electrical resistivity decreased by increasing the amount of replacement. Silica fume was very effective in controlling chloride ion penetration and reducing total charge passed. Silica fume also controlled the temperature of the solutions used during the test which indicates the control of the movement of ions in the penetration into concrete.
Effect of silica fume on durability of self-compacting concrete made with waste recycled concrete aggregates
Sasanipour, Hossein (author) / Aslani, Farhad (author) / Taherinezhad, Javad (author)
2019-07-29
Article (Journal)
Electronic Resource
English
Self-compacting concrete , Recycled concrete aggregates , Silica fume , Chloride ion penetration , Electrical resistivity , Water absorption , Ultrasonic pulse velocity , SCC , self-compacting concrete , C , cement , w/b ratio , water/binder ratio , RCA , recycled concrete aggregate , CNA , coarse natural aggregate , CRA , coarse recycled concrete aggregate , FNA , fine natural aggregate , FRA , fine recycled concrete aggregate , SF , silica fume , SP , superplasticizer , LP , limestone powder , Comp St , compressive strength , UPV , ultrasonic pulse velocity , ER , electrical resistivity , TCHP , total charge passed , ITZ , interface transition zone
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