Determination of Polycyclic Aromatic Compounds in Asphalt and in Corresponding Leachate Water

The environmental impact of polycyclic aromatic compounds (PACs) in asphalt (bitumen) materials is related to their availability for environmental transport and biouptake, rather than their total concentrations. This study examines six Strategic Highway Research Program (SHRP) paving asphalts and four commercial roofing asphalts. Three cleanup procedures for the neat asphalt samples are evaluated. This study reports on analyses for 29 PACs, including the EPA 16 priority pollutant PAHs and additional Persistent Bioaccumulative Toxins. These require reporting by the U.S. EPA under the Emergency Planning and Community Right-to-Know Act (EPCRA) section 313. The analytical protocol for analysis of the higher molecular weight PACs by GC/MS is reported, with inclusion of GC/MS/MS verification of some of the detectable compounds. Additionally, each asphalt was taken through a toxicity characteristic leaching procedure following U.S. EPA method SW846-1311. Results of the paving and roofing asphalts and their corresponding leachate waters are presented in this study.     

地面铺装更具人性化若干要素

随着时代的变迁,城市的风貌也在不以人的意志为转移而发生着变化,对于人行道及广场的规范建设,人们总在期待人性化舒适度不断提高。她们的铺装以追求愉悦色彩、创意和图案,富有人性的让步行成为一种乐趣的人行道和广场与建筑物、树街道及风景的和谐是大家追求的目标。本文将从几个方面探求以人为本的地面铺装艺术问题。     

利用图象测量技术的摊铺机实时定向测量系统

为实现对摊铺机行进方向的实时非接触式测量 ,采用图象测量技术 ,利用 CCD图象传感器构成了方向测量系统。介绍了该系统的测量原理、组成结构及软件设计。实验结果表明 ,该系统具有 1 mm的测量分辨力和± 3mm的测量精度 ,且完全满足对测量实时性的要求。     

硫酸钙晶须在道路改性沥青中的应用研究(Ⅰ)

研究了不同改性剂处理的硫酸钙晶须用量、沥青改性工艺因素以及基质沥青属性等对道路沥青性能的影响规律.结果表明,改性后的硫酸钙晶须能明显提高沥青的软化点,降低沥青的针入度,并且随改性剂添加量的增加沥青软化点逐渐增加,其针入度逐渐减小.本研究为沥青改性提供了一类新材料,同时也为硫酸钙晶须的应用研究奠定了基础.     

具有热稳定性SBS改性道路沥青的研制

沙中AH - 70沥青具有芳香分含量高等特点 ,根据苯乙烯 -丁二烯 -苯乙烯嵌段共聚物 (SBS)与沥青中的芳香烃组分相容性最好的特性 ,通过高速剪切机将SBS聚合物溶于沙中AH - 70沥青中 ,经过高速搅拌得到SBS和基质沥青均匀的混合物。再将单质硫、ZnO和 2 -巯基苯并噻唑作为稳定剂与通过液 -固吸附色谱柱分离技术从安庆循环催化裂化废油中分离出富芳香分油混合 ,制成稳定剂母液 ,在一定条件下 ,加入到SBS和基质沥青的混合物中 ,研制出了符合交通部JTJ0 36 - 98系列中的I -D类技术要求的SBS改性道路沥青产品。离析实验结果表明热储存稳定性达到技术标准要求 ,而且具有良好的感温性能、高温稳定性能、低温抗裂性和抗老化性能     

AR—20沥青改性剂性能评价

介绍了沥青改性剂AR－20的基本性能,考察了AR－20对沥青性能的影响,以及对沥青混合料的抗车辙能力、对沥青与碎石粘结力的改善作用。     

Study on Composition and Structure of Liaoshu Asphalt

In this article, the structure characteristics of Liaoshu paving asphalts have been studied by the methods of element analysis, SARA and E-D-M. At same time, the relation between composition and structure and using performance of Liaoshu paving asphalt were established. The experimental results show that carbon and hydrogen contents were more than 95%, the hydrogen/carbon atom ratio was about 1.5 in the Liaoshu paving asphalts. The content of saturates is between 20 and 25% in the Liaoshu paving asphalt, aromatics 35-40%, resin 25-30%, and asphaltene 8-10%. There are 45 carbon atoms in asphalt average molecule, which contain 16-17 aromatic carbon atoms. The number of total ring in asphalt average molecule is 5-6, the aromatic ring is 3-4, the naphthene ring is 1-2.     

用薄膜氧化法指导生产1号AH-70道路沥青的研究

根据薄膜烘箱试验的氧化历程建立了一种能评价和预测用氧化法生产70号沥青时产品膜后性能的试验方法,经过实验室和工业的验证;该种薄膜氧化法用来模拟和预测浅度氧化生产70号沥青时产品的软化点,膜后低温延度和针入度比具有较好的准确性,这一特点在指导A原油生产1号AH-70道路沥青时取得了较理想的结果。     

A Study on Aging Kinetics of Asphalt Based on Softening Point

Abstract

Asphalt aging is a nonreversible first order reaction, and the extent of asphalt aging is usually expressed by the increase of its softening point. In this article, the first order aging kinetic model of asphalt has been put forward based on softening points of asphalt at different aging time, and the kinetic parameters have been obtained. The results showed that the aging of asphalt could be described with softening point and belonged to first order kinetics, which offered a available and convenient method for studying the asphalt aging behavior. The aging resistance of two paving asphalts were also compared by this model.