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| Content Provider | CSIR - National Institute of Science Communication and Policy Research (NISCPR) |
|---|---|
| Author | Du, Yuanbo Kong, Lijuan |
| Abstract | The impermeability and frost-resistance of concrete prepared with different water-binder ratios containing different types (shale ceramsite, fly ash ceramsite and clay ceramsite), particle sizes (5-10 mm, 5-16 mm and 5-20 mm) and prewetting degrees (dry, 1 h pre-wetted and saturated) of lightweight aggregate (LWA) are evaluated. The microhardness and pore structure of the interfacial transition zone (ITZ) are also investigated, and the grey correlation theory is adopted to analyze the effect of LWA and ITZ with multi-factors on the durability of concrete. The results show that, the particle size of LWA and porosity of the ITZ have the highest correlation degree with the chloride diffusion coefficient of concrete, and their ri are higher than 0.9, which indicates that both of them have a significant effect on the impermeability of concrete. Moreover, the prewetting degree of LWA should be decreased as far as possible, on the premise of meeting the concrete workability. Because the strong water absorbing force of LWA may help lower the porosity and increase the microhardness of the ITZ. For the frost-resistance of concrete, the strength of LWA is the dominant influencing factor, which suggests the significance of the frost-resistance of LWA itself, especially for concrete with a high water-binder ratio. In this study, the frost-resistance of concrete prepared with clay ceramsite, which has the lowest strength, is the worst. Furthermore, a dense ITZ is also good for the frost-resistance of concrete. Thus, the LWA with high strength and low water content can be used to prepare concrete with a high frost-resistance. The grey correlation model provides a new idea for the optimum selection of LWA to prepare highly durable concrete. |
| Ending Page | 119 |
| Starting Page | 111 |
| ISSN | 09714588 |
| e-ISSN | 09751017 |
| Journal | Indian Journal of Engineering and Materials Sciences (IJEMS) |
| Issue Number | 01 |
| Volume Number | 22 |
| Language | English |
| Publisher | CSIR-NISCAIR, India |
| Publisher Date | 2015-02-01 |
| Access Restriction | Open |
| Rights License | CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| Subject Keyword | Lightweight aggregate Concrete durability Grey correlation Microhardness Interfacial transition zone |
| Content Type | Text |
| Resource Type | Article |
| Subject | Materials Science Engineering |
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