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.
[1] 钟世航,黄克忠.用物探技术探查乐山大佛内部状况[J].工程地球物理学报,2004,1(3):226-230.
[2] 秦中,张捷,彭学艺.四川乐山大佛风化的初步探讨[J].地理研究,2005,24(6):928-934.
[3] 四川省文物考古研究所.治理乐山大佛的前期研究[M].成都:四川科学技术出版社,2002,25-30.
[4] 李林香,谭盐宾,李康,等.玄武岩纤维、聚丙烯腈纤维和聚乙烯醇纤维对混凝土性能影响的对比研究[J].铁道建筑,2019,59(11):131-134.
[5] 李为民,许金余.玄武岩纤维对混凝土的增强和增韧效应[J].硅酸盐学报,2008,36(4):56-61.
[6] Han S M,Wu X G.Reinforcement to induce ductile behavior in an ultra highperformance fiber reinforced concrete beam[J].Key Engineering Materials,2014,629-630:85-90.
[7] Jang J G,Kim H K,Kim T S,et al.Improved flexural fatigue resistance of PVA fiber-reinforced concrete subjected to freezing and thawing cycles[J].Construction and Building Materials,2014,59:129-135.
[8] Bhuvaneshwari P,Mohan K S R.Strength analysis of reinforced concrete beams affected by fire using glass fiber sheet and PP fiber ECC as binders[J].Iranian Journal of Science and Technology-Transactions of Civil Engineering,2016,41(1):1-11.
[9] Kim S B,Yi N H,Kim H Y,et al.Material and structural performance evaluation of recycled PET fiber reinforced concrete[J].Cement and Concrete Composites,2010,32(3):232-240.
[10] Zhou H,Huang P,Zheng S,et al.Size effect of fracture toughness of high strength fiber concrete[J].Journal of Computational and Theoretical Nanoscience,2011,4(3):977-980.
[11] Irwan J M,Othman N,Koh H B,et al.Development of mix design nomographfor polyethylene terephthalate fiber concrete[J].Applied Mechanics and Materials,2012,253-255:408-416.
[12] 张景科,王南,樊孟.烧料礓石改性遗址土裂隙注浆材料龄期性能试验研究[J].岩石力学与工程学报,2018,37(1):220-229.