Effect of sewage sludge ash on mechanical properties, drying shrinkage and high-temperature resistance of cement mortar
The treatment and disposal of sewage sludge ash (SSA) have emerged as crucial environmental concerns. This study delves into the profound impact of substituting SSA for sand in cement mortar, examining fresh and mechanical properties, drying shrinkage, and high-temperature resistance. Analyzing the...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524002523 |
| _version_ | 1797235562976903168 |
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| author | Xianliang Zhou Xiaojun Zhou Ling He Yingda Zhang |
| author_facet | Xianliang Zhou Xiaojun Zhou Ling He Yingda Zhang |
| author_sort | Xianliang Zhou |
| collection | DOAJ |
| description | The treatment and disposal of sewage sludge ash (SSA) have emerged as crucial environmental concerns. This study delves into the profound impact of substituting SSA for sand in cement mortar, examining fresh and mechanical properties, drying shrinkage, and high-temperature resistance. Analyzing the SSA-modified mortar through X-ray diffraction (XRD) and scanning electron microscopy (SEM), the research reveals that the porous nature of sludge ash marginally influences the hydration rate and degree by adsorbing ions or encapsulating cement particles. While the SSA leaching solution has only a neglectable impact on the hydration rate. The workability is enhanced with the increase of the addition of excess water. Meanwhile, although the presence of excess water indirectly increases the w/c ratio of mortar, mortar with 5 % and 10 % SSA exhibit superior mechanical performance due to denser microstructure. Porous structures of SSA and more excess water in higher SSA content result in the rise of mortar drying shrinkage. When the sintering temperature reaches 800 °C, the high-temperature resistance of mortar with 20 % SSA is greater than that of the control group. The rough surface of SSA effectively fills cracks induced by elevated temperatures and improves the friction reaction, contributing to enhanced performance. |
| first_indexed | 2024-04-24T16:49:56Z |
| format | Article |
| id | doaj.art-c603e46b9e89479eb88d2ef2a543a4e1 |
| institution | Directory Open Access Journal |
| issn | 2214-5095 |
| language | English |
| last_indexed | 2024-04-24T16:49:56Z |
| publishDate | 2024-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj.art-c603e46b9e89479eb88d2ef2a543a4e12024-03-29T05:50:20ZengElsevierCase Studies in Construction Materials2214-50952024-07-0120e03101Effect of sewage sludge ash on mechanical properties, drying shrinkage and high-temperature resistance of cement mortarXianliang Zhou0Xiaojun Zhou1Ling He2Yingda Zhang3School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, ChinaSchool of Architecture and Civil Engineering, Xihua University, Chengdu 610039, ChinaSchool of Architecture and Civil Engineering, Xihua University, Chengdu 610039, ChinaCorresponding author.; School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, ChinaThe treatment and disposal of sewage sludge ash (SSA) have emerged as crucial environmental concerns. This study delves into the profound impact of substituting SSA for sand in cement mortar, examining fresh and mechanical properties, drying shrinkage, and high-temperature resistance. Analyzing the SSA-modified mortar through X-ray diffraction (XRD) and scanning electron microscopy (SEM), the research reveals that the porous nature of sludge ash marginally influences the hydration rate and degree by adsorbing ions or encapsulating cement particles. While the SSA leaching solution has only a neglectable impact on the hydration rate. The workability is enhanced with the increase of the addition of excess water. Meanwhile, although the presence of excess water indirectly increases the w/c ratio of mortar, mortar with 5 % and 10 % SSA exhibit superior mechanical performance due to denser microstructure. Porous structures of SSA and more excess water in higher SSA content result in the rise of mortar drying shrinkage. When the sintering temperature reaches 800 °C, the high-temperature resistance of mortar with 20 % SSA is greater than that of the control group. The rough surface of SSA effectively fills cracks induced by elevated temperatures and improves the friction reaction, contributing to enhanced performance.http://www.sciencedirect.com/science/article/pii/S2214509524002523Sewage sludge ashMortarMechanical propertiesDrying shrinkageHigh-temperature resistance |
| spellingShingle | Xianliang Zhou Xiaojun Zhou Ling He Yingda Zhang Effect of sewage sludge ash on mechanical properties, drying shrinkage and high-temperature resistance of cement mortar Case Studies in Construction Materials Sewage sludge ash Mortar Mechanical properties Drying shrinkage High-temperature resistance |
| title | Effect of sewage sludge ash on mechanical properties, drying shrinkage and high-temperature resistance of cement mortar |
| title_full | Effect of sewage sludge ash on mechanical properties, drying shrinkage and high-temperature resistance of cement mortar |
| title_fullStr | Effect of sewage sludge ash on mechanical properties, drying shrinkage and high-temperature resistance of cement mortar |
| title_full_unstemmed | Effect of sewage sludge ash on mechanical properties, drying shrinkage and high-temperature resistance of cement mortar |
| title_short | Effect of sewage sludge ash on mechanical properties, drying shrinkage and high-temperature resistance of cement mortar |
| title_sort | effect of sewage sludge ash on mechanical properties drying shrinkage and high temperature resistance of cement mortar |
| topic | Sewage sludge ash Mortar Mechanical properties Drying shrinkage High-temperature resistance |
| url | http://www.sciencedirect.com/science/article/pii/S2214509524002523 |
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