纳米Al2O3协同水性环氧树脂对水泥基锚固注浆材料改性研究

锚固注浆材料性能良好,可有效提高锚固结构的服役寿命。为解决传统水泥基锚固注浆材料在边坡工程中稳定性和力学性能不足的问题,采用纳米Al₂O₃、水性环氧树脂对水泥基锚固注浆材料进行改性获得复合改性水泥浆材。通过正交试验、扫描电镜和X射线衍射测试,研究不同水灰比及配合比下复合改性水泥浆材的基本性能和改性机制。结果表明,复合改性水泥浆材的流动度、凝结时间、抗压强度受水性环氧树脂掺量的影响均大于纳米Al₂O₃掺量,而漏斗黏度、析水率受纳米Al₂O₃掺量的影响大于水性环氧树脂掺量。复合改性水泥浆材具有稳定性高、析水率低、抗压强度高等特点,有效解决了传统水泥基锚固注浆材料存在的稳定性和力学性能不足的问题,且其最佳性能配合比为水灰比0.5、纳米Al₂O₃掺量5%(质量分数,下同)、水性环氧树脂20%、固化剂掺量2.0%。

Modification of Cement-Based Anchoring Grouting Material by Nano-Al2O3 Synergistic with Waterborne Epoxy Resin

The anchoring grouting material hasgood performance and can effectively improve the service life of the anchoring structure. In order to solve the problems of insufficient stability and mechanical properties of traditional cement-based anchoring grouting material in slope engineering, nano-Al₂O₃ and waterborne epoxy resin were used to modify cement-based anchoring grouting material to obtain composite modified cement slurry. Through orthogonal experiment, scanning electron microscope and X-ray diffraction test, the basic properties and modification mechanism of composite modified cement slurry under different water-cement ratios and mix ratios were studied. The results show that the fluidity, setting time and compressive strength of composite modified cement slurry are more affected by the content of waterborne epoxy resin than that of nano-Al₂O₃. But the funnel viscosity and water seperation rate are more affected by the content of nano-Al₂O₃ than that of waterborne epoxy resin. The composite modified cement slurry has the characteristics of high stability, low water separation rate and high compressive strength, which effectively solves the problems of insufficient stability and mechanical properties of traditional cement-based anchoring grouting material. And there exists the best performance mix ratio: water-cement ratio is 0.5, nano-Al₂O₃ content is 5% (mass fraction, the same below), waterborne epoxy resin content is 20%, and curing agent content is 2.0%.