阻燃改性沥青物理性能和阻燃抑烟性能研究

为了研究阻燃剂对SBS改性沥青物理性能和阻燃抑烟性能的影响,制备了不同阻燃剂用量(10%~50%)的阻燃改性沥青,通过三大物理性能指标试验、黏韧性试验、氧指数试验和烟密度试验对比分析阻燃改性沥青性能变化规律。结果表明:阻燃剂可以增强SBS改性沥青的高温性能,降低沥青的低温性能和温度敏感性。阻燃剂能够提高SBS改性沥青的黏韧性,但阻燃剂用量过大会造成沥青抗断裂能力的降低。阻燃剂用量大于沥青质量的40%时,阻燃沥青具有良好的阻燃性能和抑烟性能。

光催化降解尾气环保型路面研究综述

基于汽车尾气路面净化技术,简要介绍了催化材料的光催化机理及选用原则,系统梳理光催化剂改性技术,然后研究了光催化尾气降解规律,最后介绍了国内外的工程应用实例,显示出光催化尾气降解路面的应用前景。

立捣卧挤炭素压机挤压室的制造工艺

通过对挤压室的粗加工、半精加工、热装、焊接及精加工等制造工序分析,并在各工序中对加工参数、热处理参数及焊接参数进行控制,保证挤压室在各工序中尺寸和精度达到图纸及工艺要求,并最终保证挤压室满足装配使用性能要求,保证产品质量。

Influence of rainfall on skid resistance performance and driving safety conditions of asphalt pavements

To study the influence of rainfall on pavement skid-resistance performance and driving safety,the water film thickness(WFT)concept considering the longitudinal and transverse slopes of the pavement was utilized based on the total discharge formulation and turbulence theory of slope flow.Using experimental data measured using the British pendulum test under varying WFT levels,a model for calculating the skid resistance,namely the British pendulum number(BPN),was formulated and used to quantitatively evaluate the effects of rainfall intensity,transverse,and longitudinal slopes on the computed BPN.The study results reveal that skid resistance is linearly proportional to the pavement transverse slope and inversely proportional to the rainfall intensity and the pavement longitudinal slope.In particular,rainfall intensity,along with pavement texture depth,exhibited a significant impact on the tire-pavement friction and skid-resistance performance.The results further indicate that driving safety under wet weather is predominantly governed by skid resistance and visibility.The BPN and sideway force coefficient(SFC60)values for new asphalt pavements under different rainfall intensities are provided along with some modification to the stopping sight distance(SSD)criteria.Safe driving speed limits are also determined using a safe-driving model to develop the appropriate speed limit strategies.The overall study results provide some insights,methodology approach,and reference data for the evaluation of pavement skid-resistance performance and driving safety conditions under different pavement slopes and rainfall intensities.

阻燃剂对SBS改性沥青流变性能的影响

为了研究阻燃剂对SBS改性沥青流变性能的影响,制备了不同阻燃剂用量(10%~50%)的阻燃改性沥青,通过动态剪切流变试验(DSR)和弯曲梁劲度试验(BBR)测试阻燃沥青的流变性能。结果表明:阻燃剂能够提高阻燃沥青的车辙因子,增强阻燃沥青的高温流变性能;随着阻燃剂用量的增加,阻燃沥青的疲劳因子不断增大,加入20%~30%阻燃剂能使阻燃沥青保持原样沥青的疲劳性能;阻燃剂能够增大阻燃沥青的蠕变劲度、减小松弛速率,从而提升阻燃沥青的低温流变性能。