全废渣混合料在道路工程中的应用研究

该文首先对石灰、粉煤灰、70砂、液态渣等化学成分进行分析,并对一系列不同配比的二灰(石灰、粉煤灰)进行对比实验,从混合料击实曲线、石灰剂量与抗压强度关系曲线及实际使用效果以石灰:粉煤灰为15:     

复杂天气驾驶ABC

A雾天驾驶 在大雾笼罩下，光线受阻能见度很低，给车辆行驶带来很大困难。为了确保安全，雾中行驶应注意不管是白天还是夜晚都要打开防雾灯、示宽灯和尾灯，且边行驶边鸣号，以引起行人及其他车辆驾驶员的注意；车速要低，由于雾天视距很短，有时有效视距仅有几米，只有降低车速，遇到紧急情况时才有时间采取措施；会车时要鸣号，且开、闭灯示意，     

Finite element simulation of rod and wire continuous rolling

This paper discusses the application of several techniques involved in the development of the 3D finite element (FE) models of rod and wire continuous rolling process. The FE models are implemented into the FE-program MSC.Marc and used to investigate the thermal and mechanical behavior of billet during the rolling process. All nonlinear equations included in the models are solved by the static and dynamic procedures, respectively. Data transfer technique is proposed to keep the continuity of simulation results. And the computational time of static procedure is significantly reduced by using a rigid pushing body. In all models, the constant time step method and the auto time step method are respectively used to define time step for the solution of equations. Simulation results of the models with different time step methods are compared. And comparison between calculated values and measured ones of the temperature at the surface of billet shows the validity of the FE models.     

温拌沥青混合料制备技术研究现状及新进展

温拌沥青混合料作为一种节能环保的绿色混合料,近年来得到了道路工程界的广泛关注。该文较为全面地介绍了温拌技术的发展历程,目前国外已有的温拌技术的工作原理,混合料的制备工艺及降温幅度等。开发了一种自主的基于软质沥青预拌、岩沥青粉末复配技术的温拌沥青混合料制备方法,该技术制备出来的温拌混合料的温度降低30℃～40℃,性能与热拌沥青混合料基本一致。     

沥青混合料疲劳损伤模型参数实验研究

首先介绍疲劳累积损伤定律在沥青类材料中的应用,针对不同模型的特点及应用条件,采用Lemaitre疲劳累积损伤模型作为沥青混合料疲劳损伤模型,通过进行疲劳损伤实验设计,获得沥青类材料疲劳损伤特性参数,为计算材料疲劳损伤程度奠定了基础。     

大石大桥扩建工程设计与施工

从整体上介绍了G105国道大石大桥扩建工程的设计与施工情况,重点介绍了(43.75+62.5+43.75)m连续箱梁的设计,其中横断面设计巧妙地解决了在桥面车道不对称的情况下怎样使结构对称的问题,大大方便了施工,可供类似工程参考.