融雪剂离子在沥青中的渗透行为分析  

Penetration Behavior of Snow-Melting Agent Ions in Asphalt

作　　者：张倩[1,2] 王鹏淘 常开朗 冯伟 裴晓梅 ZHANG Qian;WANG Pengtao;CHANG Kailang;FENG Wei;PEI Xiaomei(School of Civil Engineering,Xi'an University of Architecture&Technology,Xi'an 710055,Shaanxi,China;Shaanxi Key Lab of Geotechnical and Underground Space Engineering,Xi'an University of Architecture&Technology,Xi'an 710055,Shaanxi,China;Xi'an Xinlong Enterprise Holding Co.,Ltd.,Xi'an 710065,Shaanxi,China;Xi'an Highway Bureau,Xi'an 710003,Shaanxi,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学陕西省岩土与地下空间工程重点实验室,陕西西安710055 [3]西安鑫龙企业控股有限公司,陕西西安710065 [4]西安市公路局,陕西西安710003

出　　处：《重庆交通大学学报（自然科学版）》2024年第10期19-27,共9页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：陕西省交通运输厅交通运输科研项目(23-25R);陕西省交通运输厅交通科技项目(16-14K);衢州市科技计划项目(2019K39)。

摘　　要：为研究融雪剂离子在沥青中的渗透扩散行为,采用A_(3) N(由醋酸盐、NaNO_(2)和尿素配制而成)、Ca(CH_(3)COO)_(2)、Mg(CH_(3)COO)_(2)、KCH_(3)COO、NaCl和NaNO_(2)共6种融雪剂对沥青进行渗透实验,通过三大指标的变化分析融雪剂对沥青稠度、塑性和高温稳定性的影响。利用离子色谱仪检测融雪剂溶液中离子浓度的变化,分析融雪剂阳、阴离子的渗透扩散规律。基于各浸泡周期融雪剂阳、阴离子浓度的变化,运用Fick定律分析各融雪剂离子在沥青中的渗透扩散行为。结果表明:经融雪剂浸泡后,基质沥青和SBS改性沥青的稠度和塑性增大,且NaCl对稠度和塑性的影响最大,而醋酸盐和A 3 N使沥青的高温稳定性降低,NaNO_(2)和NaCl会提高沥青的高温稳定性;融雪剂离子在基质沥青中的渗透性强于SBS改性沥青,阳、阴离子扩散强度最大分别为KCH_(3)COO中的K^(+)和Mg(CH_(3)COO)_(2)中CH_(3)COO^(-),经过5周期的渗透,基质沥青和SBS改性沥青上方融雪剂溶液中K^(+)浓度降幅分别为27.59%和16.89%,CH_(3)COO^(-)的浓度降幅分别为35.16%和19.38%;Fick定律扩散模型可较好描述沥青对各离子吸附量的变化,其中阳离子吸附量的非线性拟合优度高于阴离子,更易被量化分析。To study the permeation and diffusion behavior of snow-melting agent ions in asphalt,six kinds of snow-melting agents,including A_(3)N(prepared from acetate,NaNO_(2)and urea),Ca(CH_(3)COO)_(2),Mg(CH_(3)COO)_(2),KCH_(3)COO,NaCl,and NaNO_(2),were employed to conduct penetration experiments on asphalt.The influence of snow-melting agents on viscosity,plasticity and high-temperature stability of asphalt were investigated through changes of three major indicators.An ion chromatograph was used to detect changes of ion concentration in snow-melting agent solution and analyze the permeation and diffusion patterns of cation and anion of snow-melting agents.Based on the changes of the concentration of cations and anions of snow-melting agents during each soaking cycle,Fick's law was introduced to analyze the permeation and diffusion behavior of snow-melting agent ions in asphalt.The results show that the viscosity and plasticity of the base asphalt and SBS-modified asphalt increase after soaking with the snow-melting agent,and NaCl has the greatest impact on viscosity and plasticity.Acetate and A 3N can reduce the high-temperature stability of asphalt,while NaNO_(2)and NaCl can improve the high-temperature stability of asphalt.The permeability of snow-melting agent ions in the base asphalt is stronger than that of the SBS-modified asphalt.The maximum diffusion intensities of cations and anions are K^(+)in KCH_(3)COO and CH_(3)COO^(-)in Mg(CH_(3)COO)_(2).After 5 cycles of permeation,the concentration of K^(+)in the snow-melting agent solution above the base asphalt and SBS-modified asphalt is decreased by 27.59%and 16.89%,respectively,while the concentration of CH_(3)COO^(-)is decreased by 35.16%and 19.38%,respectively.The Fick's law diffusion model can better describe the changes in the adsorption capacity of various ions by asphalt,among which the non-linear fitting goodness of cation adsorption capacity is higher than that of anion,making it easier to be quantified and analyzed.

关 键 词：道路工程 离子渗透行为 Fick定律 融雪剂 

分 类 号：U414[交通运输工程—道路与铁道工程]