采用废旧胶粉和抗车辙剂对90号A级道路石油沥青进行双重改性,对比双重改性沥青混合料与SBS改性沥青混合料的高温性能、低温性能、水稳定性能,结果表明双重改性沥青混合料的高温性能优于SBS改性沥青混合料,低温性能略低于SBS改性沥青混合料、水稳定性能略高于SBS改性沥青混合料。总体而言,双重改性沥青混合料的路用性能可满足规范的最高要求,且其高温抗车辙性能显著。

Asphalt mixture was double modified by waste robber powder and anti-rutting agent. High and low temperature performance, water stability performance between SBS modified asphalt mixture and dou-ble modified asphalt mixture were contrasted. The results show that the high temperature performance of double modified asphalt mixture is better than that of the SBS modified asphalt mixture,the low tempera-ture performance of double modified asphalt mixture is a little less than that of the SBS modified asphalt mixture, the water stability performance of double modified asphalt mixture is a little better than that of the SBS modified asphalt mixture. Overall, double modified asphalt mixture can meet the highest require-ments of the specification, and high temperature anti-rutting performance is significantly.

螺旋盘管反应器无内插件及扰流部件,通过流体流动过程产生的二次流来提高微观混合效果,比较适合于黏性流体混合过程。今采用碘化物-碘酸盐平行竞争反应体系为工作体系,以甘油调节体系黏度,对螺旋盘管反应器内黏性体系的微观混合性能进行研究。考察了物料体积流量、H+浓度、体积比、体系黏度、盘管内径对微观混合性能的影响,并与内径及有效长度相同直管的微观混合性能进行对比研究。结果表明,在实验研究范围内,提高物料体积流量可以增强混合效果,随H+浓度增加,离集指数显著增大。反应物摩尔比相同的前提下,微观混合性能随体积比增加而变差。随体系黏度增大,微观混合性能降低。减小螺旋盘管内径,微观混合性能提高,与直管相比,螺旋盘管反应器微观混合效果明显增强。

Helical tube reactors (HTR) are suitable for enhancing micromixing efficiency of viscous fluids by means of secondary flow. Micromixing efficiency of viscous fluids in a HTR was experimentally studied using a parallel competing iodide-iodate reaction system and glycerine was used to adjust the system viscosity. Effects of the fluid flow rate, concentration of H+, volumetric ratio, fluid viscosity and diameter of helical tube on the micromixing efficiency were investigated. Comparison of micromixing efficiency between HTR and a straight tube reactor with same length and diameter was also conducted. The experimental results show that micromixing efficiency is improved (i.e. segregation index XS is decreased) with the increase of volumetric flow rate. It decreases significantly when [H+] increases. When the molar ratio of reagents is fixed, micromixing efficiency decreases with the increase of volumetric flow ratio. It also decreases with the increase of fluid viscosity. Micromixing effic

为研究老化对橡胶颗粒沥青混合料路用性能的影响，对4种不同橡胶颗粒掺量的沥青混合料分别进行短期老化与长期老化路用性能试验，针对低温性能特别提出衰减率的评价指标。结果表明，橡胶颗粒沥青混合料老化后高温性能明显增强，低温抗裂性能出现突变点、水稳性能有所降低，综合老化前后性能对比研究得知该级配混合料橡胶颗粒最佳掺量为4％。

There are 4 different percentage of rubber particles asphalt mixture which are used for short-term aging and long-term aging test.It aims at researching the influence of the aging procedures with the performance of granulated crumb rubber asphalt mixture.The decay rate of low-temperature per-formance was proposed as an evaluating indicator.This investigation shows that the high-temperature per-formance of aged crumb rubber asphalt mixture is obviously enhanced while the low-temperature anti-crack performance and water stability is slightly reduced.It is also indicate that the asphalt mixture of 4% rubber particles will guarantee the optimal performance.

采用湿法和干法2种工艺制备橡胶粉改性沥青混合料,对比分析基质沥青混合料、湿法工艺ARAC-13沥青混合料、干法工艺ARAC-13沥青混合料3种沥青混合料的高温稳定性、水稳定性及低温抗裂性能。研究结果表明:随着水泥替代矿粉比例增加,沥青混合料的路用性能先提高,后降低;橡胶粉改性沥青混合料水稳定性优于基质沥青混合料;ARAC-13W沥青混合料低温抗裂性能优于ARAC-13D沥青混合料性能;40目橡胶粉掺量为21%、水泥替代矿粉的比例为60%时,水泥橡胶粉复合改性沥青混合料路用性能最佳。

This paper adopts two processes, i. e. wet method and dry method to prepare rubber powder modified asphalt mixtures, and comparatively analyzes high-temperature stability, water stability and low-temperature anti-cracking ability of three asphalt mixtures, i. e. matrix asphalt mixture, ARAC-13 asphalt mixture with wet process and ARAC-13 asphalt mixture with dry process. The result of research shows that the road performance is improved first and then reduced with increase cement proportion in stead of mineral powder;the water stability of rubber powder modified asphalt mixture is superior to matrix asphalt mixture;the low-temperature anti-cracking ability of ARAC-13 W asphalt mixture is superior to ARAC-13 D asphalt mixture;when dosage of 40-mesh rubber powder is 21% and proportion of cement in stead of mineral powder is 60%, the road performance of cement-rubber powder compound modified asphalt mixture is optimal.

沥青混合料抗剪性能不足是路面车辙病害的主要原因,选择合理的沥青混合料抗剪性能试验方法及评价指标尤为重要,选择三轴、同轴剪切和单轴贯入试验,进行沥青混合料抗剪性能检测方法比较,结果表明三种试验方法得到的试验结果规律相同,评价结果相似,均可作为沥青混合料抗剪性能的试验方法,在三轴试验不具备条件情况下,同轴剪切与单轴贯入试验方法也可用来检测沥青混合料的抗剪性能。

The lack of anti-shear properties of asphalt pavement leading to early diseases such as rutting,the selection of shear test methods and performance evaluation is particularly important.Coaxial shear,triaxial shear tests and the uniaxial penetration test are used to compare the performance of these asphalt mixture shear test methods in this paper.It can be found that the raw of coaxial shear,triaxial shear tests and the uniaxial penetration test results is uniform,evaluation results are similar,and all these tests can be used as the performance of asphalt mixture shear test method.In no condition to conduct the triaxial shear test,the coaxial shear and uniaxial penetration test method can also be used to measure the anti-shear properties of asphalt mixtures.