摘要
氧化石墨烯(GO)是近年来逐步应用于道路工程的一种新型的无机纳米材料,是有效改善沥青物理性能和抗老化能力的潜在材料.为了探究GO能否提高沥青的抗老化性能,采用GO对70#基质沥青进行改性,探究了不同GO掺量(0%、0.5%、1%、2%、3%)对沥青的改性效果.通过不同掺量对照组的三大指标试验(针入度、软化点和延度)、薄膜烘箱实验(RTFOT)和压力老化容器实验(PAV)评价改性沥青的老化性能,并利用傅里叶红外光谱(FTIR)测试在不同GO掺量和不同老化时间条件下的羰基指数和亚砜指数.研究结果表明,随着GO掺量不断增加,GO改性沥青的软化点不断增大,针入度逐渐减小,延度明显降低,GO的添加可在一定程度上降低沥青内部组分发生变化的程度;当GO掺量为2%时,可以明显可以改善基质沥青的老化性能;GO掺量2%的改性沥青在RTFOT和PAV老化之间的增长斜率略小于GO掺量1%改性沥青,GO掺量2%的改性沥青与GO掺量3%的改性沥青增长斜率几乎保持一致;GO的掺入可以降低沥青中极性官能团在老化过程中的生成量,可以有效地阻隔沥青中小分子的扩散,延缓老化中发生的化学反应.
Graphene oxide(GO)is a new type of laminar inorganic nano material which has been gradually applied in road engineering in recent years,and it a potential material to effectively improve the physical properties and anti-aging ability of asphalt. In order to explore whether GO can improve the anti-aging performance of asphalt,this paper used GO to modify 70# asphalt,and explored the modification effect of different GO dosages(0%,0.5%,1%,2%,3%)on asphalt. The aging properties of modified asphalt with different GO dosages were evaluated by three index tests(needle penetration,softening point and ductility),film oven test(RTFOT)and pressure aging vessel test(PAV). The Fourier transform infrared spectroscopy(FTIR)was used to measure the carbonyl index and sulfoxide index of modified a sphalt under different GO contents and different aging times. The results show that with the increase of GO content,the softening point of asphalt modified with GO increases,the needle penetration decreases gradually,and the ductility decreases obviously. The addition of GO can reduce the change degree of the internal components of asphalt to a certain extent. When GO content is 2%,the aging property of matrix asphalt can be obviously improved. The growth slope of modified asphalt with 2% GO content between RTFOT and PAV aging is slightly less than that of modified asphalt with 1% GO content,and the growth slope of modified asphalt with 2%GO content is almost the same as that of modified asphalt with 3% GO content. The addition of GO can reduce the generation amount of polar functional groups in the asphalt during the aging process,effectively block the diffusion of small molecules in the asphalt,and delay the chemical reaction occurring during aging.
作者
应军志
汪海年
沈思立
叶旻
张琛
YING Junzhi;WANG Hainian;SHEN Sili;YE Min;ZHANG Chen(Hangzhou Urban Expressway Co.Ltd.,Hangzhou 310007,China;College of Highway,Chang’an University,Xi’an 710064,China)
出处
《河南科学》
2022年第1期72-77,共6页
Henan Science
基金
浙江省交通运输厅科研计划项目(2020034)
2020年度交通运输行业重点科技项目(2020-MS1-055)。
作者简介
应军志(1976-),男,高级工程师,主要从事高速公路建设管理。
