Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix
High-fluidity and self-compacting concrete (SCC) mixes were developed using special aggregates for radiation-shielding concrete. The special aggregates comprised heavyweight and hydrous aggregates (crushed magnetite, crushed serpentine, and their mixtures), which were selected to provide an enhanced...
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MDPI AG
2021-03-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/6/1549 |
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| author | Michał A. Glinicki Jacek Gołaszewski Grzegorz Cygan |
| author_facet | Michał A. Glinicki Jacek Gołaszewski Grzegorz Cygan |
| author_sort | Michał A. Glinicki |
| collection | DOAJ |
| description | High-fluidity and self-compacting concrete (SCC) mixes were developed using special aggregates for radiation-shielding concrete. The special aggregates comprised heavyweight and hydrous aggregates (crushed magnetite, crushed serpentine, and their mixtures), which were selected to provide an enhanced attenuation of gamma and neutron radiation, respectively. For the mixed concrete design with a bulk density of up to 3570 kg/m<sup>3</sup>, two cement types were used: Portland cement CEM I and slag cement CEM III/A. The basic properties of the fresh self-compacting concrete were evaluated and the lateral formwork pressure exerted by the freshly mixed self-compacting concrete was measured and analyzed. An original test setup was developed for the determination of the lateral pressure on the square column formwork with pressure measurements carried out using six strain gauge pressure transducers, which was adequate for heavyweight concrete mixture testing. Self-compacting concrete mixtures containing a magnetite aggregate or blends of serpentine and magnetite aggregates with a slump flow of at least 550 mm were developed. The lateral pressure on the formwork was directly proportional to the density of the self-compacting heavyweight concrete mixes. The maximum values of the lateral pressure recorded in the test at a casting speed of 1.5 m/h did not exceed 27 kPa and 55% of hydrostatic pressure. Concrete mixtures with basalt, magnetite, and magnetite/serpentine blended aggregates were found to develop sufficient shear strength for proper stability during casting. |
| first_indexed | 2024-03-10T13:01:05Z |
| format | Article |
| id | doaj.art-85fa1d0f4a0c429db70447d293b73caa |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T13:01:05Z |
| publishDate | 2021-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-85fa1d0f4a0c429db70447d293b73caa2023-11-21T11:30:17ZengMDPI AGMaterials1996-19442021-03-01146154910.3390/ma14061549Formwork Pressure of a Heavyweight Self-Compacting Concrete MixMichał A. Glinicki0Jacek Gołaszewski1Grzegorz Cygan2Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego Street 5 B, 02-106 Warszawa, PolandDepartment of Building Processes and Building Physics, Faculty of Civil Engineering, Silesian University of Technology, Akademicka Street 5, 44-100 Gliwice, PolandLaboratory of Civil Engineering, Faculty of Civil Engineering, Silesian University of Technology, Boleslawa Krzywoustego Street 7, 44-100 Gliwice, PolandHigh-fluidity and self-compacting concrete (SCC) mixes were developed using special aggregates for radiation-shielding concrete. The special aggregates comprised heavyweight and hydrous aggregates (crushed magnetite, crushed serpentine, and their mixtures), which were selected to provide an enhanced attenuation of gamma and neutron radiation, respectively. For the mixed concrete design with a bulk density of up to 3570 kg/m<sup>3</sup>, two cement types were used: Portland cement CEM I and slag cement CEM III/A. The basic properties of the fresh self-compacting concrete were evaluated and the lateral formwork pressure exerted by the freshly mixed self-compacting concrete was measured and analyzed. An original test setup was developed for the determination of the lateral pressure on the square column formwork with pressure measurements carried out using six strain gauge pressure transducers, which was adequate for heavyweight concrete mixture testing. Self-compacting concrete mixtures containing a magnetite aggregate or blends of serpentine and magnetite aggregates with a slump flow of at least 550 mm were developed. The lateral pressure on the formwork was directly proportional to the density of the self-compacting heavyweight concrete mixes. The maximum values of the lateral pressure recorded in the test at a casting speed of 1.5 m/h did not exceed 27 kPa and 55% of hydrostatic pressure. Concrete mixtures with basalt, magnetite, and magnetite/serpentine blended aggregates were found to develop sufficient shear strength for proper stability during casting.https://www.mdpi.com/1996-1944/14/6/1549consistencyformwork pressurefresh mixmagnetite aggregatemix designPortland cement |
| spellingShingle | Michał A. Glinicki Jacek Gołaszewski Grzegorz Cygan Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix Materials consistency formwork pressure fresh mix magnetite aggregate mix design Portland cement |
| title | Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix |
| title_full | Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix |
| title_fullStr | Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix |
| title_full_unstemmed | Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix |
| title_short | Formwork Pressure of a Heavyweight Self-Compacting Concrete Mix |
| title_sort | formwork pressure of a heavyweight self compacting concrete mix |
| topic | consistency formwork pressure fresh mix magnetite aggregate mix design Portland cement |
| url | https://www.mdpi.com/1996-1944/14/6/1549 |
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