Citation: | HU Dexin, SHAN Yuxi, WANG Hailiang, et al. Microstructure and self-repairing performance of granular loaded graphene oxide composite cement-based materials[J]. Acta Materiae Compositae Sinica, 2024, 41(6): 3079-3091. DOI: 10.13801/j.cnki.fhclxb.20231025.002 |
The self-repairing of cement-based materials is an effective way for the improvement of the durability performance. The addition of graphene oxide (GO) has a toughening and strengthening effect on cement-based materials, which has a positive effect on the micro-crack self-healing of the cement-based materials. In this paper, highly dispersion of GO in cement-based materials is achieved by granular loaded method, and the effects of GO incorporation on mechanical properties, self-repairing properties, hydration products and microstructure of cement-based materials were studied.
SiO-GO (SG) and SiO-CaCO-GO (SCG) were prepared by granular loaded method, nano-SiO and CaCO powder as the support of GO, the effects of incorporation of SG and SCG on the mechanical properties of cement-based materials were studied. The self-repairing properties of the cement-based materials were characterized by compressive strength repairing rate, water permeability repairing rate and crack repairing rate. The effects of granular loaded GO on the hydration products of cement-based materials were analyzed by XRD; the hydration process of cement-based materials were analyzed by TG; the effect of granular loaded GO on the microstructure of cement-based materials were analyzed by SEM-EDS, and the related mechanism of granular loaded GO on the self-repairing properties of cement-based materials was proposed.
According to the test results of mechanical properties, under the same dosage, the flexural strength of SCG/CE sample at 28d reached 8.8 MPa, increased by 7.3% compared with the blank sample, and the flexural strength of SiO/CE and SG/CE decreased slightly. The compressive strength of SCG/CE sample at 28d was 57.2 MPa, increased by 18.7% compared with the blank sample, which was significantly higher than that of SiO/CE and SG/CE samples. SCG/CE specimens showed better repair ability than the other specimens. Among them, the compressive strength repair rate reached 110.6%, and the water permeability repair rate and surface crack repair rate reached 100% after 28d repairing. XRD and TG analysis showed that SCG/CE had a higher hydration degree at different curing age, the content of Ca(OH) further decreased from 15.77% at 3d to 14.90% at 28d. It also can be seen from the SEM of each sample that the connection between the particles and the cement matrix in the SCG/CE specimen is more close, more hydration products produced on the surface of the plate SCG particles. EDS spectra also showed that the Ca/Si mass ratio of SCG/CE was higher than the other samples, with the advancement of hydration age, particles participate in hydration, and the hydration degree of SCG is higher, which also take a good explanation for the better self-repairing performance of SCG/CE samples: due to the high dispersion of SCG and good interfacial compatibility with cement, SCG/CE samples have better self-repairing properties. When micro-cracks appeared, SCG in the micro-crack could react with the Ca, the generation of C-S-H gel products filled the micro-cracks of the cement, resulting in the improvement of the mechanical strength of the cement, the self-repairing behavior is beneficial for the enhancement of the durability of the cement-based materials.Conclusions: With the special two-dimensional nanostructure, GO can be used as a nucleation site to promote cement hydration and regulate hydration products of cement-based materials, and the mechanical performance, microstructure and durability of cement-based materials could be improved by the high dispersion of GO in the cement. In this paper, SCG particles with a stronger compatibility with cement-based materials were prepared by granular loaded method, which allowed GO to be highly dispersed and realized the self-repairing properties of cement-based materials,the mechanism of the action of SCG on the self-repairing performance of cement-based materials was analyzed, the study provide some guidance for the self-repairing performance of GO in cement-based materials.
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