A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars
The main objective of this study is to improve the performance of ultrafine dredged sand mortars by using metakaolin (MK) and silica fume (SF) mixed with high-content FA. The mechanical properties and microstructure of the ultrafine dredged sand mortars were analyzed. The results show that the stron...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Hindawi Limited
2023-01-01
|
| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2023/6176098 |
| _version_ | 1797843389667868672 |
|---|---|
| author | Changpei Qin Junxian Zhao Yixuan Wang Yongqi Zou Fares Ali Al Sairafia Chaohua Jiang |
| author_facet | Changpei Qin Junxian Zhao Yixuan Wang Yongqi Zou Fares Ali Al Sairafia Chaohua Jiang |
| author_sort | Changpei Qin |
| collection | DOAJ |
| description | The main objective of this study is to improve the performance of ultrafine dredged sand mortars by using metakaolin (MK) and silica fume (SF) mixed with high-content FA. The mechanical properties and microstructure of the ultrafine dredged sand mortars were analyzed. The results show that the strong growth rate of the mortars with 5%, 10%, and 15% MK and SF contents, respectively, exceeds 30% at the age of 7 d. Compared with an ordinary Portland cement dredged mortar, the shrinkage of the specimens with 5% and 15% MK increases prior to 7 d and decreases by 16.9% and 13.8%, respectively, at 90 d. The addition of MK shows a better enhancement effect than that of SF, with the splitting tensile strength increased by 41.4% to 2.15 MPa with 15% MK compared with the mortar with a 50% FA content at 3 d. MK shows a higher enhancement effect than SF due to its uniquely active Al2O3. Moreover, a microstructural investigation based on scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) confirms that the physical filling and pozzolanic effects of MK and SF can optimize the microstructure of the slurry, improve the interfacial combination of different phases, and refine the pore size distribution of cement paste. The test results prove that high-content FA ternary cementitious systems containing MK or SF represent a sustainable solution to the resource utilization of building materials based on ultrafine dredged sand. |
| first_indexed | 2024-04-09T17:04:23Z |
| format | Article |
| id | doaj.art-933b425ca2204302be3c81b361e9b74b |
| institution | Directory Open Access Journal |
| issn | 1687-8442 |
| language | English |
| last_indexed | 2024-04-09T17:04:23Z |
| publishDate | 2023-01-01 |
| publisher | Hindawi Limited |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj.art-933b425ca2204302be3c81b361e9b74b2023-04-21T00:00:19ZengHindawi LimitedAdvances in Materials Science and Engineering1687-84422023-01-01202310.1155/2023/6176098A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand MortarsChangpei Qin0Junxian Zhao1Yixuan Wang2Yongqi Zou3Fares Ali Al Sairafia4Chaohua Jiang5College of Port Coastal and Offshore EngineeringCollege of Port Coastal and Offshore EngineeringFaculty of MedicineCollege of Port Coastal and Offshore EngineeringCollege of Port Coastal and Offshore EngineeringCollege of Port Coastal and Offshore EngineeringThe main objective of this study is to improve the performance of ultrafine dredged sand mortars by using metakaolin (MK) and silica fume (SF) mixed with high-content FA. The mechanical properties and microstructure of the ultrafine dredged sand mortars were analyzed. The results show that the strong growth rate of the mortars with 5%, 10%, and 15% MK and SF contents, respectively, exceeds 30% at the age of 7 d. Compared with an ordinary Portland cement dredged mortar, the shrinkage of the specimens with 5% and 15% MK increases prior to 7 d and decreases by 16.9% and 13.8%, respectively, at 90 d. The addition of MK shows a better enhancement effect than that of SF, with the splitting tensile strength increased by 41.4% to 2.15 MPa with 15% MK compared with the mortar with a 50% FA content at 3 d. MK shows a higher enhancement effect than SF due to its uniquely active Al2O3. Moreover, a microstructural investigation based on scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) confirms that the physical filling and pozzolanic effects of MK and SF can optimize the microstructure of the slurry, improve the interfacial combination of different phases, and refine the pore size distribution of cement paste. The test results prove that high-content FA ternary cementitious systems containing MK or SF represent a sustainable solution to the resource utilization of building materials based on ultrafine dredged sand.http://dx.doi.org/10.1155/2023/6176098 |
| spellingShingle | Changpei Qin Junxian Zhao Yixuan Wang Yongqi Zou Fares Ali Al Sairafia Chaohua Jiang A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars Advances in Materials Science and Engineering |
| title | A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars |
| title_full | A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars |
| title_fullStr | A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars |
| title_full_unstemmed | A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars |
| title_short | A Comparative Study of Metakaolin and Silica Fume on the Properties and Microstructure of Ultrafine Dredged Sand Mortars |
| title_sort | comparative study of metakaolin and silica fume on the properties and microstructure of ultrafine dredged sand mortars |
| url | http://dx.doi.org/10.1155/2023/6176098 |
| work_keys_str_mv | AT changpeiqin acomparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT junxianzhao acomparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT yixuanwang acomparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT yongqizou acomparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT faresalialsairafia acomparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT chaohuajiang acomparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT changpeiqin comparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT junxianzhao comparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT yixuanwang comparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT yongqizou comparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT faresalialsairafia comparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars AT chaohuajiang comparativestudyofmetakaolinandsilicafumeonthepropertiesandmicrostructureofultrafinedredgedsandmortars |