Abstract
Based on the mechanism of resin toughening cement, epoxy resin (E-44) was hydrophilic modified by 2-aminoethanesulfonic acid (SEA) to improve its dispersibility in cement slurry, so as to improving the toughness of cement matrix. The chemical structure, dispersion and heat resistance of the prepared modified epoxy resin (WEY) were characterized by FTIR, contact angle, particle size and TG-DTG. The results showed that SEA was successfully grafted onto the main chain of epoxy resin and effectively improved its dispersion and heat resistance. Subsequently, the effect of WEY on the mechanical properties of silicate cement stone was investigated. We found that when WEY was added at 6%, the flexural strength of silicate cement stone increased by 43.8%, the elastic modulus decreased by 38.9% and the compressive strength increased by 26.6%, and the engineering properties met the requirements of field applications. XRD analysis showed that the addition of WEY did not cause the cement to produce new hydration products and did not affect the process of cement hydration reaction. SEM analysis showed that WEY can form a polymer film with certain toughness in the cement stone, which plays the role of connecting each hydration product and strengthening the structural stability of the cement stone, thus slowing down the stress concentration and inhibiting the development of cracks. Finally, the modified epoxy resin effectively improves the fracture toughness of silicate cement stone and increases its ability to resist external impact.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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All authors contributed to the study conception and design.
Zhigang Peng: Supervision, Writing—review & editing.
Wei Zeng: Data curation, Formal analysis, Writing – original draft.
Qian Feng: Supervision, Writing—review & editing.
Yong Zheng: Supervision, Validation, Investigation.
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Peng, Z., Zeng, W., Feng, Q. et al. Study on Improving the Toughness of Silicate Cement Stone by Modified Epoxy Resin. Silicon 15, 3137–3148 (2023). https://doi.org/10.1007/s12633-022-02221-5
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DOI: https://doi.org/10.1007/s12633-022-02221-5