目的: 为了研究改性三乙醇胺 (TEA) 对普通硅酸盐水泥性能的影响。方法: 利用油酸改性三乙醇胺, 合成油酸三乙醇胺盐 (Y-TEA) 。测试水泥凝结时间、净浆流动度、砂浆强度、砂浆抗蚀系数、砂浆电通量、通过XRD测试分析水化产物。结果: Y-TEA加快了水泥的凝结时间、降低了水泥净浆流动度、增大了水泥砂浆各龄期强度, 改善了TEA对水泥后期的不利影响, 增大了水泥砂浆的抗蚀性能和抗渗性能。在最佳掺量0. 02%时, 水泥初凝、终凝时间分别加快了12. 0%、11. 1%, 净浆流动度降低了10. 1%, 3d、7d、28d水泥胶砂抗折、抗压强度分别提高了15. 4%、11. 2%、16. 2%、15. 4%、11. 2%、16. 2%, 水泥砂浆28d、120d抗蚀系数分别提高了11. 2%、11. 1%, 电通量降低了9. 8%; XRD测试分析发现Y-TEA能加速水泥的水化过程, 生成更多的水化产物, 使水泥内部结构更加致密。结论: 改性三乙醇胺在一定掺量下能够有效促进水泥砂浆强度的发展, 改善TEA对水泥后期强度的不利影响, 并提高了水泥砂浆的抗蚀性能和抗渗性能。

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.