考虑道路层间脱空病害的地聚合物注浆材料性能研究

Properties of Geopolymer Grouting Material Considering Road Interlayer Hollowing Diseases

道路层间脱空病害形态相对扁平,注浆修复后的固结体容易受折,因此需着重改善注浆材料的韧性和抗折性能,但目前缺乏一种针对病害特征的注浆修复材料。本文以矿渣、粉煤灰为主要原料,通过加入醋酸乙烯-乙烯共聚物可再分散性乳胶粉(简称VAE胶粉)改善地聚合物注浆材料脆性弱点,提高材料抗折强度,在使用NaOH调节模数后的水玻璃激发下进行地聚合反应,研发了地聚合物注浆材料,探究了VAE胶粉掺量等因素对注浆材料性能的影响。试验结果表明,地聚合物注浆材料综合性能最佳的配合比为矿渣粉掺量40%、粉煤灰掺量60%、VAE胶粉外掺2%、引气剂外掺0.1%、UEA膨胀剂外掺2%、水玻璃掺量25%、水玻璃模数1.6、水胶比0.35。研发的地聚合物注浆材料抗折强度提高了10.8%,脆性降低了17.4%,适用于道路层间脱空病害的修复。该研究对于推动道路隐蔽病害修复技术的发展、保障道路长期运营安全稳定具有一定的促进作用。

The shape of road interlayer hollowing diseases is relatively flat,and the consolidated body after grouting repair is prone to bending.Therefore,it is necessary to focus on improving the toughness and bending resistance of the grouting material.Currently,there is a lack of grouting repair material which target its disease characteristics.Therefore,slag and fly ash were used as the main raw materials,vinyl acetate-ethylene copolymer redispersible powder(VAE glue powder)was added to improve the brittleness and flexural strength of geopolymer grouting material,and conduct geopolymerization reaction under the excitation of water glass which modulus adjusted by NaOH.A new type of geopolymer grouting material was developed,and the influences of factors such as VAE glue powder content on the performance of geopolymer grouting material was explored.The experimental results show that the optimal mix ratio for the comprehensive performance of the new geopolymer grouting material is 40%slag powder,60%fly ash,2%VAE glue powder,0.1%air entraining agent,2%UEA expansive agent,25%water glass,1.6 water glass modulus and 0.35 water-cement ratio.The newly developed geopolymer grouting material increases to 10.8%in flexural strength and decreases to 17.4%in brittleness,making it suitable for road interlayer hollowing diseases.The research conclusion has a certain promoting effect on promoting the development of road hidden disease repair technology and ensuring the long-term safety and stability of road operation.