石墨烯增强传统砂岩文物修复材料性能研究

Enhanced mechanical properties of mortar with graphene in the traditional sandstone cultural relics conservation

川渝地区分布有8000余处石窟和摩崖造像,大部分凿刻于砂岩中,长期环境作用导致砂岩性能劣化,对赋存文化遗产的安全造成威胁。为了提升传统砂岩文物修复材料的性能,将石墨烯纳米片加入传统修复材料中,运用传统工艺制备出"CH@G"灰浆。结果表明,加入石墨烯纳米片的CH@G灰浆的力学性能和体积稳定性较传统材料明显提高。当石墨烯纳米片的添加量为质量百分比0.07%时,样品力学性能最佳,56d抗压强度、抗折强度和抗拉强度分别为4.21、2.21、0.47MPa,相对于传统修复材料,强度分别提升了7.36%、19.46%、51.61%。FT-IR、Raman和XRD结果表明,石墨烯纳米片对固化反应产物影响较小,并且可以在早期加速水化反应,从而提升早期强度。SEM结果表明,石墨烯纳米片作为一种调节相,促使灰浆形成均匀致密的微观结构。

More than 8000 grottoes and cliff statues are located in Sichuan and Chongqing.Most are made from sandstone.The sandstone has deteriorated due to long-term environmental effects,posing a threat to the cultural relics.Graphene sheets are added to the traditional mortar of the sandstone cultural relics to enhance the properties,which is defined as"CH@G mortar".The mechanical properties and volume stability of the CH@G mortar are enhanced by the graphene sheets.The highest strength is obtained by the addition of 0.07%graphene sheets,and its values(increased proportion compared with CH mortar)of compressive strength,flexural strength and tensile strength at 56 dare 4.21 MPa(7.36%),2.21 MPa(19.46%)and 0.47 MPa(51.61%),respectively.The FT-IR and Raman spectra results show that the graphene sheets have little influence on the composition of the products,and could accelerate the hydration in the early days,according to the XRD results.The SEM images show that graphene sheets could form a uniform and compacted microstructure.