玄武岩纤维和聚乙烯醇纤维对传统砂岩文物修复材料性能的影响

Influence of BF/PVAF on traditional restorative material for sandstone cultural relic

川渝地区分布有8000余处石窟和摩崖造像,大部分凿刻在砂岩中,长期环境作用导致砂岩性能出现劣化现象,对赋存文化遗产的安全造成了不同程度的威胁。为了提升传统修复材料的性能,使用玄武岩纤维(BF)和聚乙烯醇纤维(PVAF)替代传统修复材料中的麻刀,研究纤维种类和掺量对修复材料性能的影响规律。结果表明:掺加BF、PVAF能够提高修复材料的抗折强度、劈裂抗拉强度和体积稳定性,而对抗压强度和固化反应产物影响较小;当BF、PVAF掺量较高时,纤维的分散效果较差,产生的摩擦阻力随之减少;相同掺量下,BF的增强效果比PVAF更为显著。

More than 8000 grottoes and cliff statues located in Sichuan and Chongqing area,most of them were made from sandstone.The properties of sandstone showed deteriorations due to long-term environmental effect,which posed threats to cultural relics.Basalt fiber(BF)and polyvinyl alcohol fiber(PVAF)were used instead of hemp to study the influence of fiber types and content on the traditional materials for conservation.The results showed that the addition of BF and PVAF can improve the flexural strength,tensile strength and volume stability,but had little effect on the compressive strength and composition of products.When the content of BF and PVAF increased,the dispersion of the fibers and the friction resistance decreased.The reinforcement effect of BF was more significant than that of PVAF at the same content.