Mechanical Properties Improvement Mechanism of Silica Fume-Modified Ultrafine Cement Used to Repair Pavement Microcracks
With heavy modern traffic and natural factors, cement concrete pavement cracks have become increasingly serious. However, most existing inorganic repair materials for cement concrete pavement cracks have low interfacial bonding strength. Ultrafine cement, silica fume (SF), and other admixtures, whic...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2018/4898230 |
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| author | Xiaofei Wang Jiangbei Yao Xinwei Li Yinchuan Guo Aiqin Shen HuaQiao Pu |
| author_facet | Xiaofei Wang Jiangbei Yao Xinwei Li Yinchuan Guo Aiqin Shen HuaQiao Pu |
| author_sort | Xiaofei Wang |
| collection | DOAJ |
| description | With heavy modern traffic and natural factors, cement concrete pavement cracks have become increasingly serious. However, most existing inorganic repair materials for cement concrete pavement cracks have low interfacial bonding strength. Ultrafine cement, silica fume (SF), and other admixtures, which are superfine and used to repair fine early cracks, are prepared as the mending material in our research. Compression strength, bending strength, and interfacial bonding strength are studied, and modification mechanisms are discovered by using a powder X-ray diffraction test, thermal analysis, and micromorphology observation. The result shows that mechanical strength of the stable period is improved with the right amount of mixing of SF, which leads to secondary pozzolanic reaction and makes the microstructure of the paste denser. Meanwhile, a large amount of Ca(OH)2 and water in the interface area are consumed by the secondary pozzolanic reaction, which brings out good interfacial effects with no water film between the new paste and existing concrete. Our experiments show that the pastes with 3–5% SF have better bending strength (15%∼17% improvement) and compressive strength (7%∼9% improvement). Interfacial bonding strength is also increased with a certain amount of SF. Tensile shear bonding strength has been improved more than 4 times when SF dosage is more than 3%. Thus, we recommend a paste with 5% SF as the best mixture to be used to repair cracks. |
| format | Article |
| id | doaj-art-40718efb73f447f09f5162bcb8271892 |
| institution | DOAJ |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-40718efb73f447f09f5162bcb82718922025-08-20T02:39:15ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422018-01-01201810.1155/2018/48982304898230Mechanical Properties Improvement Mechanism of Silica Fume-Modified Ultrafine Cement Used to Repair Pavement MicrocracksXiaofei Wang0Jiangbei Yao1Xinwei Li2Yinchuan Guo3Aiqin Shen4HuaQiao Pu5Associate Professor, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaMaster, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaSenior Engineer, Guangzhou Expressway Company Limited, Guangzhou 510288, ChinaAssociate Professor, School of Highway, Chang’an University, Xi’an 710064, ChinaProfessor, School of Highway, Chang’an University, Xi’an 710064, ChinaMaster, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, ChinaWith heavy modern traffic and natural factors, cement concrete pavement cracks have become increasingly serious. However, most existing inorganic repair materials for cement concrete pavement cracks have low interfacial bonding strength. Ultrafine cement, silica fume (SF), and other admixtures, which are superfine and used to repair fine early cracks, are prepared as the mending material in our research. Compression strength, bending strength, and interfacial bonding strength are studied, and modification mechanisms are discovered by using a powder X-ray diffraction test, thermal analysis, and micromorphology observation. The result shows that mechanical strength of the stable period is improved with the right amount of mixing of SF, which leads to secondary pozzolanic reaction and makes the microstructure of the paste denser. Meanwhile, a large amount of Ca(OH)2 and water in the interface area are consumed by the secondary pozzolanic reaction, which brings out good interfacial effects with no water film between the new paste and existing concrete. Our experiments show that the pastes with 3–5% SF have better bending strength (15%∼17% improvement) and compressive strength (7%∼9% improvement). Interfacial bonding strength is also increased with a certain amount of SF. Tensile shear bonding strength has been improved more than 4 times when SF dosage is more than 3%. Thus, we recommend a paste with 5% SF as the best mixture to be used to repair cracks.http://dx.doi.org/10.1155/2018/4898230 |
| spellingShingle | Xiaofei Wang Jiangbei Yao Xinwei Li Yinchuan Guo Aiqin Shen HuaQiao Pu Mechanical Properties Improvement Mechanism of Silica Fume-Modified Ultrafine Cement Used to Repair Pavement Microcracks Advances in Materials Science and Engineering |
| title | Mechanical Properties Improvement Mechanism of Silica Fume-Modified Ultrafine Cement Used to Repair Pavement Microcracks |
| title_full | Mechanical Properties Improvement Mechanism of Silica Fume-Modified Ultrafine Cement Used to Repair Pavement Microcracks |
| title_fullStr | Mechanical Properties Improvement Mechanism of Silica Fume-Modified Ultrafine Cement Used to Repair Pavement Microcracks |
| title_full_unstemmed | Mechanical Properties Improvement Mechanism of Silica Fume-Modified Ultrafine Cement Used to Repair Pavement Microcracks |
| title_short | Mechanical Properties Improvement Mechanism of Silica Fume-Modified Ultrafine Cement Used to Repair Pavement Microcracks |
| title_sort | mechanical properties improvement mechanism of silica fume modified ultrafine cement used to repair pavement microcracks |
| url | http://dx.doi.org/10.1155/2018/4898230 |
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