Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material
Experimental work was carried out to study new fine aggregate shielding construction materials, namely black sand (BS). The BS effect on the mechanical, durability, and shielding characteristics of heavyweight high-performance concrete (HWHPC) was evaluated. This study aimed at improving various HWH...
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| Format: | Article |
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MDPI AG
2021-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/18/5353 |
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| author | Khaled A. Eltawil Mohamed G. Mahdy Osama Youssf Ahmed M. Tahwia |
| author_facet | Khaled A. Eltawil Mohamed G. Mahdy Osama Youssf Ahmed M. Tahwia |
| author_sort | Khaled A. Eltawil |
| collection | DOAJ |
| description | Experimental work was carried out to study new fine aggregate shielding construction materials, namely black sand (BS). The BS effect on the mechanical, durability, and shielding characteristics of heavyweight high-performance concrete (HWHPC) was evaluated. This study aimed at improving various HWHPC properties, concertedly. Fifteen mixtures of HWHPC were made, with various variables, including replacing 10% and 15% of the cement with fly ash (FA) and replacing normal sand by BS at various contents (15%, 30%, 45%, 60%, 75%, and 100%). The test specimens were subjected to various exposure conditions, including elevated temperatures, which ranged from 250 °C to 750 °C, for a duration of 3 h; magnesium sulfate (MS) exposure; and gamma-ray exposure. The effects of elevated temperature and sulfate resistance on concrete mass loss were examined. The results revealed that BS is a promising shielding construction material. The BS content is the most important factor influencing concrete compressive strength. Mixes containing 15% BS demonstrated significantly better strength compared to the control mixes. Exposure to 250 °C led to a notable increase in compressive strength. BS showed a significant effect on HWHPC fire resistance properties, especially at 750 °C and a significant linear attenuation coefficient. Using 10% FA with 15% BS was the most effective mixing proportion for improving all HWHPC properties concertedly, especially at greater ages. |
| first_indexed | 2024-03-10T07:29:31Z |
| format | Article |
| id | doaj.art-f5b58553d3d04f089d592929111f3008 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T07:29:31Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-f5b58553d3d04f089d592929111f30082023-11-22T14:02:42ZengMDPI AGMaterials1996-19442021-09-011418535310.3390/ma14185353Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction MaterialKhaled A. Eltawil0Mohamed G. Mahdy1Osama Youssf2Ahmed M. Tahwia3Department of Structural Engineering, Faculty of Engineering, Mansoura University, Mansoura 35511, EgyptDepartment of Structural Engineering, Faculty of Engineering, Mansoura University, Mansoura 35511, EgyptDepartment of Structural Engineering, Faculty of Engineering, Mansoura University, Mansoura 35511, EgyptDepartment of Structural Engineering, Faculty of Engineering, Mansoura University, Mansoura 35511, EgyptExperimental work was carried out to study new fine aggregate shielding construction materials, namely black sand (BS). The BS effect on the mechanical, durability, and shielding characteristics of heavyweight high-performance concrete (HWHPC) was evaluated. This study aimed at improving various HWHPC properties, concertedly. Fifteen mixtures of HWHPC were made, with various variables, including replacing 10% and 15% of the cement with fly ash (FA) and replacing normal sand by BS at various contents (15%, 30%, 45%, 60%, 75%, and 100%). The test specimens were subjected to various exposure conditions, including elevated temperatures, which ranged from 250 °C to 750 °C, for a duration of 3 h; magnesium sulfate (MS) exposure; and gamma-ray exposure. The effects of elevated temperature and sulfate resistance on concrete mass loss were examined. The results revealed that BS is a promising shielding construction material. The BS content is the most important factor influencing concrete compressive strength. Mixes containing 15% BS demonstrated significantly better strength compared to the control mixes. Exposure to 250 °C led to a notable increase in compressive strength. BS showed a significant effect on HWHPC fire resistance properties, especially at 750 °C and a significant linear attenuation coefficient. Using 10% FA with 15% BS was the most effective mixing proportion for improving all HWHPC properties concertedly, especially at greater ages.https://www.mdpi.com/1996-1944/14/18/5353heavyweight high-performance concreteblack sandfly ashfire resistancemagnesium sulfateshielding radiation |
| spellingShingle | Khaled A. Eltawil Mohamed G. Mahdy Osama Youssf Ahmed M. Tahwia Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material Materials heavyweight high-performance concrete black sand fly ash fire resistance magnesium sulfate shielding radiation |
| title | Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material |
| title_full | Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material |
| title_fullStr | Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material |
| title_full_unstemmed | Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material |
| title_short | Producing Heavyweight High-Performance Concrete by Using Black Sand as Newly Shielding Construction Material |
| title_sort | producing heavyweight high performance concrete by using black sand as newly shielding construction material |
| topic | heavyweight high-performance concrete black sand fly ash fire resistance magnesium sulfate shielding radiation |
| url | https://www.mdpi.com/1996-1944/14/18/5353 |
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