Effects of nano-SiO2 on sulfate attack resistance of multi-solid waste-based alkali-activated mortar
This study investigated the performance of multi-solid waste-based alkali-activated mortar (MAAM) subjected to wet-dry cycling and sulfate exposure. The effects of nano-SiO2 (NS) modification, both before and after exposure, on the material's mechanical properties and sulfate attack resistance...
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| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525000269 |
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| author | Jingjun Li Shichao Wu Yuxuan Shi Yongbo Huang Ying Tian Duinkherjav Yagaanbuyant |
| author_facet | Jingjun Li Shichao Wu Yuxuan Shi Yongbo Huang Ying Tian Duinkherjav Yagaanbuyant |
| author_sort | Jingjun Li |
| collection | DOAJ |
| description | This study investigated the performance of multi-solid waste-based alkali-activated mortar (MAAM) subjected to wet-dry cycling and sulfate exposure. The effects of nano-SiO2 (NS) modification, both before and after exposure, on the material's mechanical properties and sulfate attack resistance were evaluated through various indices, including flexural strength, corrosion resistance coefficient, mass loss rate, and SO42- concentration. Additionally, a cumulative damage model was developed to assess the overall degradation. The mechanism behind the improved sulfate attack resistance due to nano-modification was elucidated using advanced microscopic techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and backscattered electron imaging (BSE). The study demonstrated that both flexural and compressive strengths initially increased and then decreased with rising NS content. The highest strength values were observed at 2 % NS content (NS2.0), with flexural and compressive strengths enhanced by 27.4 % and 22.8 %, respectively, compared to the undoped group (NS0). After sulfate attack, the NS2.0 group exhibited superior flexural strength, a more stable corrosion resistance coefficient, and lower mass loss, damage rate, and SO42- concentration compared to the NS0 group. In addition, both groups followed similar trends with increasing wet-dry cycling. Microstructural analysis further revealed that NS-modified specimens possessed a denser and more uniform microstructure than the unmodified ones, underscoring the critical role of NS in improving resistance to sulfate attack in the MAAM. |
| format | Article |
| id | doaj-art-ad04c787734c4c4fab456173ae6a8adc |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-ad04c787734c4c4fab456173ae6a8adc2025-01-13T04:18:55ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e04227Effects of nano-SiO2 on sulfate attack resistance of multi-solid waste-based alkali-activated mortarJingjun Li0Shichao Wu1Yuxuan Shi2Yongbo Huang3Ying Tian4Duinkherjav Yagaanbuyant5School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China; Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering, Baotou 014010, ChinaSchool of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China; Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering, Baotou 014010, ChinaSchool of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China; Inner Mongolia Key Laboratory of Safety and Durability for Civil Engineering, Baotou 014010, China; Corresponding author at: School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou 014010, China.Shandong Provincial Key Lab of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, ChinaBaotou Steel Group Energy Saving and Environmental Protection Technology Industry Co. Ltd., Baotou 014010, ChinaCenter for Experimental Research on Building Structures of the Mongolian State University of Science and Technology, Ulaanbaatar, MongoliaThis study investigated the performance of multi-solid waste-based alkali-activated mortar (MAAM) subjected to wet-dry cycling and sulfate exposure. The effects of nano-SiO2 (NS) modification, both before and after exposure, on the material's mechanical properties and sulfate attack resistance were evaluated through various indices, including flexural strength, corrosion resistance coefficient, mass loss rate, and SO42- concentration. Additionally, a cumulative damage model was developed to assess the overall degradation. The mechanism behind the improved sulfate attack resistance due to nano-modification was elucidated using advanced microscopic techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and backscattered electron imaging (BSE). The study demonstrated that both flexural and compressive strengths initially increased and then decreased with rising NS content. The highest strength values were observed at 2 % NS content (NS2.0), with flexural and compressive strengths enhanced by 27.4 % and 22.8 %, respectively, compared to the undoped group (NS0). After sulfate attack, the NS2.0 group exhibited superior flexural strength, a more stable corrosion resistance coefficient, and lower mass loss, damage rate, and SO42- concentration compared to the NS0 group. In addition, both groups followed similar trends with increasing wet-dry cycling. Microstructural analysis further revealed that NS-modified specimens possessed a denser and more uniform microstructure than the unmodified ones, underscoring the critical role of NS in improving resistance to sulfate attack in the MAAM.http://www.sciencedirect.com/science/article/pii/S2214509525000269Alkali-activated mortarNano-SiO2Wet-dry cycleSulfate attackMechanical properties |
| spellingShingle | Jingjun Li Shichao Wu Yuxuan Shi Yongbo Huang Ying Tian Duinkherjav Yagaanbuyant Effects of nano-SiO2 on sulfate attack resistance of multi-solid waste-based alkali-activated mortar Case Studies in Construction Materials Alkali-activated mortar Nano-SiO2 Wet-dry cycle Sulfate attack Mechanical properties |
| title | Effects of nano-SiO2 on sulfate attack resistance of multi-solid waste-based alkali-activated mortar |
| title_full | Effects of nano-SiO2 on sulfate attack resistance of multi-solid waste-based alkali-activated mortar |
| title_fullStr | Effects of nano-SiO2 on sulfate attack resistance of multi-solid waste-based alkali-activated mortar |
| title_full_unstemmed | Effects of nano-SiO2 on sulfate attack resistance of multi-solid waste-based alkali-activated mortar |
| title_short | Effects of nano-SiO2 on sulfate attack resistance of multi-solid waste-based alkali-activated mortar |
| title_sort | effects of nano sio2 on sulfate attack resistance of multi solid waste based alkali activated mortar |
| topic | Alkali-activated mortar Nano-SiO2 Wet-dry cycle Sulfate attack Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525000269 |
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