[期刊论文][Full-length article]

出版年：2020

Ongoing marine development has drawn considerable attentions on reinforcing the construction of marine engineering. A high ferrite Portland clinker (HFPC) with 47% C₃S, 27% C₂S, 6% C₃A, and 20% C₄AF was designed in this study. Compared with traditional Portland cement, there is larger amount of C₄AF and hydration products like AH₃ and FH₃ that can absorb Cl⁻, SO₄²⁻, Mg²⁺ from seawater in the high ferrite cement. The activities of C₄AF and C₃S could be changed by adding Cu²⁺ under first-Principle calculation. The hydration activity of the high ferrite Portland clinker (HFPC) can be significantly enhanced by doping with Cu²⁺ because Cu²⁺ solidifies better in C₄AF. This study aims to explore the mechanism of CuO-doping on the hydration performance and chloride-binding capacity of HFPC by using different microscopic analysis methods, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and nuclear magnetic resonance (NMR). The results show that C₄AF has the better hydration activity when it is incorporated with 1.0% CuO. According to our calculations by Density Functional Theory and our experimental results, C₄AF was easily influenced by the doping Cu²⁺. As for C₄AF, the site of ferrite element can be replaced by copper element, accounting for the improvement of the hydration activity of it when the moderate amount of CuO was doped. As for C₃S, it had the less influence of CuO-doping on it when few amounts of CuO was doped into the clinker. The polymorph of C₃S was transferred from R to M_III, when the CuO amount was up to 0.8% which made a has unsatisfactory hydration activity under this condition. Taking all the results into consideration, HFPC has the better hydration activity and chloride-binding capacity when 0.2%CuO is doped into the clinker.

Binding chloride ions ; C₄AF ; CuO ; High ferrite Portland clinker (HFPC) ; Hydration behavior