Study on the Effect of Oleic Acid Modified Triethanolamine on Cement Performance

Abstract

Objective: In order to study the effect of modified triethanolamine (TEA) on the properties of common silicate cement. Methods: Oleic acid was used to modify triethanolamine to synthesize oleic acid triethanolamine salt (Y-TEA) . Cement setting time, net slurry flow, mortar strength, mortar corrosion resistance coefficient, mortar electric flux were tested, and hydration products were analysed by XRD test. Results: Y-TEA accelerates the setting time of cement, reduces the net cement flow, increases the strength of cement mortar at all ages, improves the adverse effect of TEA on cement at the later stage, and increases the corrosion resistance and seepage resistance of cement mortar. At the optimal dosage of 0. 02%, the initial and final setting time of cement was accelerated by 12. 0% and 11. 1% respectively, the net slurry flow was reduced by 10. 1%, the flexural and compressive strengths of cementitious mortar at 3d, 7d and 28d were increased by 15. 4%, 11. 2%, 16. 2%, 15. 4%, 11. 2% and 16. 2% respectively, and the corrosion resistance coefficients of cementitious mortar at 28d and 120d increased by 11. 2% and 11. 1%, respectively, and the electric flux decreased by 9. 8%; XRD test analysis found that Y-TEA could accelerate the cement hydration, produce more hydration products and compact the internal structure of cement. Conclusion: Modified triethanolamine can effectively promote the development of cement mortar strength under a certain dosage, improve the adverse effect of TEA on the late strength of cement, and improve the corrosion resistance and seepage resistance of cement mortar.