| Summary: | 碩士 === 國立嘉義大學 === 應用化學系研究所 === 100 === In this study, we used the partial oxidation technique to modify the surface hydrophilic property of tire rubber particles to enhance the bonding between rubber and the calcium silicate hydrate (C-S-H). The oxidation experiments were conducted under the controlled reaction temperature and the oxygen content. To reduce the reaction temperature, two catalysts, ferrous oxide (FeO) and ferric oxide (Fe2O3), were tested in this study. The surface functional groups of the as-received and the treated rubbers were explored with Fourier transform infrared spectrometer (FT-IR). The results of the FT-IR analysis showed that the treated rubber had R-SOx-R functional groups, which is most obvious at 250℃ conditions. The pyrolysis mixtures of natural silica sand surface had R-SOx-R and R-S-H according to the analysis results of NMR. Both catalysts could effectively reduce the reaction temperature.
Both the as-received and the treated rubber particles were used to prepare cement pastes. Optical microscopy (OM), scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD) were used to observe the paste. OM observation showed that pastes with treated rubber gave a more densely structure than that of pastes with the as-received rubber. SEM pictures depicted that the microstructure of the pastes with the treated rubber gave a large number of C-S-H crystallization than that of pastes with the as-received rubber. XRD results gave the evidence that cement pastes with the treated rubber had obvious signal of C-S-H crystallization than that of the other samples. A simple waterproof test found that the paste with treated rubber were hydrophobic. It is different from the normal cement paste which is hydrophilic in general. It is believed that pastes with partial oxidation rubber can be used as waterproof materials.
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