复合生物油再生剂研发及其对长期老化沥青成分的影响OACSTPCD
Development of composite bio-oil regenerant and its effects on chemical constituents of long-term aged asphalt
为了研发一种新型复合生物油再生剂,并探究其对长期老化沥青化学成分的再生作用,采用蓖麻油植物沥青(COA)与环氧大豆油(ESO)按照不同复配比例制备了复合生物油再生剂,确定了复合生物油中蓖麻油植物沥青与环氧大豆油的最优复配比例;基于红外光谱变化研究了蓖麻油植物沥青与环氧大豆油的原位动态化学反应机制,以及沥青再生前后的化学成分变化情况.结果表明,按照蓖麻油植物沥青和环氧大豆油质量比1:3复配制得的复合生物油再生剂可以有效地将长期老化沥青的基本性能恢复至老化前水平.蓖麻油植物沥青和环氧大豆油发生了开环缩合反应,生成含脂肪族的聚合物,该反应在老化沥青再生过程中仍然可以持续地进行,并继续影响再生沥青的基本性能.在蓖麻油植物沥青和环氧大豆油的共同作用下,再生沥青中的亚砜基和羰基官能团含量减少.该研究提供了一种长期老化沥青的复合生物油再生剂,并揭示了其对长期老化沥青化学成分的影响及再生作用.
As a kind of waste material in the production chain of plant oleic acid,vegetable asphalt has similar color and viscosity with asphalt.However,when vegetable asphalt is used as a regenerant alone,its high viscosity leads to poor permeability.Epoxidized soybean oil(ESO)is as an industrial plasticizer,and its low viscosity can reduce the viscosity of vegetable asphalt.To develop a new type of sustainable composite bio-oil regenerant product and under-stand its rejuvenation effect on the chemical constituents of long-term aged asphalt,the castor oil vegetable asphalt(COA)was selected to react with ESO for preparing the composite bio-oil regenerant.The optimal ratio of COA to ESO in the composite bio-oil regenerant was determined.The in-situ dynamic chemical reaction mechanism between COA and ESO,as well as the changes in chemical constituents of recycled asphalt were characterized.Results indicate that the mass ratio of COA to ESO is 1:3 in the prepared composite bio-oil regenerant.When the content of composite bio-oil regenerant agent is 8％,it has the best rejuvenating effect on the long-term aged asphalt.The composite bio-oil can restore the basic physical properties of aged asphalt to its original level,and the chemical reaction between COA and ESO can improve the viscosity of recycled asphalt,but reduces the ductility at low temperature.When COA and ESO are mixed at 80 ℃,the epoxide group in ESO and the carboxyl group in COA undergo the ring-opening conden-sation reaction to produce hydroxy-lipid.These continuous chemical reactions are one of the main reasons for the chan-ges in the basic properties of recycled asphalt,and the developed composite bio-oil regenerant can be prepared at any time.The performance recovery of long-term aged asphalt mainly depends on the physical fusion with the composite bio-oil regenerant.The composite bio-oil can reduce the content of carbonyl group in the aged asphalt,but cannot re-duce the content of sulfoxide group.This study provides a new kind of composite bio-oil regenerant for long-term aged asphalt,as well as reveals its effects on the chemical constituents of long-term aged asphalt and rejuvenation action.
蒋宇;许涛
南京林业大学土木工程学院,南京 210037
交通运输
复合生物油植物沥青环氧大豆油原位动态化学反应老化沥青再生沥青
composite bio-oilvegetable asphaltepoxidized soybean oilin-situ dynamic chemical reactionaged as-phaltrecycled asphalt
《林业工程学报》 2024 (001)
170-176 / 7
国家自然科学基金(52278452).
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