High-temperature exposure during fire decreases not only the mechanical properties of concrete structures but also their durability, especially their concrete carbonation resistance. However, the degradation of concrete carbonation resistance after fire exposure remains unclear. Concrete specimens with water/cement (w/c) ratios of 0.4, 0.5, and 0.6 were fabricated to solve such problems, and high-temperature experiments were performed at 400 degrees C, 500 degrees C, and 600 degrees C and sustained for one hour. Then, mechanical and accelerated carbonation experiments were conducted, and the carbonation depths and pH values of concrete were tested. X-ray diffraction, thermogravimetry analysis, and mercury intrusion porosimetry experiments were also performed on concrete with and without high-temperature treatment. Results showed that high-temperature exposure caused severe degradation in concrete compressive strength, relative dynamic modulus of elasticity, and carbonation resistance, and the carbonation resistance loss of concrete was higher than its mechanical property loss. Concrete with lower w/c ratio suffered more losses in mechanical properties, whereas w/c ratio had no obvious effect on the carbonation resistance degradation of fire-damaged concrete. The key mechanism of the decline in the carbonation resistance of concrete after fire was not mainly the alkalinity drop in concrete but the considerable increase in concrete porosity and harmful pores. Instead of the traditional phenolphthalein method, a new method of residual OH- concentration of superficial concrete after accelerated carbonation was proposed to evaluate the carbonation resistance of concrete after fire. The average carbonation resistance of the concrete with the three w/c ratios was reduced by 66.3 %, 84.2 % and 95.1 % after exposure to 400 degrees C, 500 degrees C, and 600 degrees C, respectively.

山东高速集团有限公司(以下简称"山东高速")是基础设施领域的国有资本投资公司和世界500强企业,注册资本459亿元,资产总额突破1.3万亿元.山东高速致力于打造主业突出、核心竞争力强的基础设施投资建设运营服务商和行业龙头企业,锚定建设世界一流企业和世界一流基础设施综合服务商,奋力打造平台经济数字化转型新典范,为交通强国建设提供有力支撑.

为了探究塑料润滑剂对SBS改性机理研究,选择三种不同处理方式的乙撑双硬脂酸酰胺APL/APE/APR与SBS共混制备复合改性沥青.本文通过对四种改性沥青样品的相容性及官能团的分布进行分析,发现四种沥青在离析实验中的软化点差都在2℃以下,塑料润滑剂对SBS改性沥青的热贮存稳定性没有明显影响;通过DSC分析发现,APL和APE可以提高SBS改性沥青吸热峰和放热峰温度,使其高温性能和粘弹区间范围得到提高;通过IR分析,发现添加APL、APE后,SBS改性沥青中的官能团类型增多,且具有独特的键和官能团,导致其粘性成分下降,因此SBS改性沥青的高温特性得到明显改善,将APR添加到SBS改性沥青中,会形成独特的C=O键,使其具有更多粘结,从而改善其低温性能.

高速公路服务区作为保障高速公路高效运行的重要附属设施,通过服务水平评价提高其服务质量具有重要意义.本文基于模糊数学、定性-定量分析等方法,从基础设施质量评价、常用设施运行评价、来访人员满意度评价等不同角度出发,结合权重计算模型构建高速公路服务区服务水平综合评价体系.该综合评价体系的提出为山东高速所属服务区服务质量提质增效提供了良好借鉴,同时进一步优化了相关部门的运营管理水平.

To effectively improve the carbonation and chloride resistance of concrete with eco-friendly waterborne organic coatings, two nanomaterials (i.e., nano-SiO2 and nano-TiO2) were utilized to modify the water-based polyurethane and epoxy resin paints at dosages of 1 wt%, 2 wt%, and 3 wt%, and the coated concrete specimens were fabricated. Then, accelerated aging experiments of ultraviolet irradiation were conducted on the coated concrete specimens, followed by accelerated carbonation or Coulomb electric flux experiments. In addition, partial coating film samples were analyzed by scanning electron microscopy and Fourier transform infrared spectroscopy. Results show that the application of water-based organic coatings can substantially improve the carbonation and chloride resistance of concrete. The two-component water-based epoxy resin coating exhibited a higher quality than the one-component water-based polyurethane coating, thus resulting in better improvement of the carbonation and chloride resistance of concrete. However, the anti-aging capability of water-based epoxy resin coating is lower than that of water-based polyurethane coating, resulting in the rapid decline of the carbonation or chloride resistance of coated concrete after ultraviolet aging. The addition of nano-SiO2 or nano-TiO2 to the water-based organic coating can reduce the defects in the coating, effectively improve the density of the coating, and further improve the carbonation and chloride resistance of the coated concrete, with average improvement ranges of 51-74 % and 24-27 %, respectively. Meanwhile, the addition of nano-SiO2 or nano-TiO2 can help reduce the damage of water-based coatings caused by ultraviolet irradiation, thereby improving the long-term carbonation and chloride resistance of coated concrete, among which the improvement effect of nano-TiO2 is higher than that of nano-SiO2.

随着交通基础设施建设的飞速发展和人民生活水平的不断提升,传统服务区的功能布局和服务模式已无法满足公众出行的多样化需求.自2016年开始,齐鲁交通服务开发集团有限公司(以下简称"齐鲁交通服务开发集团")启动服务区提升改造项目,短短3年间,涌现了一大批兼具地域文化特色和多元商业模式的高品质服务区.与此同时,齐鲁交通服务开发集团依托大数据、云计算、移动互联网、物联网、人工智能等新技术,打造了以大数据为核心的"智慧大脑"支持体系,实现了服务区"数据+运营+服务"一张网.下一步,齐鲁交通服务开发集团还将不断探索智能化、自动化、精细化"未来服务区"的实现路径.

基于大数据的综合运管系统 当前,齐鲁交通所辖3580公里高速公路,管理手段大部分是以人工调度为主,以传统摄像机识别为辅,自动化监测程度不高,缺少对数据的深层次挖掘,可视化程度差.对路网管理、应急决策的支撑不足,侧重于传统业务处理,智能化水平不高.

我国高速公路迅猛发展的同时,配套的服务区数量猛增,服务区运营所产生的污水引起的环境污染问题已广受关注.本文对适用于高速服务区污水治理工程的生物生态技术进行总结,分析比较各技术的优缺点及适用性,旨在为服务区污水的有效处理,实现服务区的健康可持续运行提供理论参考.

立足于高速公路服务区的发展现状及基本属性,阐述景区化模式选择的必要性,研究高速公路服务区的主要功能和延伸功能,提出高速公路服务区景区化开发的主要模式及路径,对高速公路服务区服务质量的提升与开发运营管理具有重要的现实指导意义.

The structure of the highway alignment has a direct effect on the driving safety.With the longitudinal gradient at the long slope alignment of the mountain highways as the research target,a study of the relationships between the driver's heart-rate,the vehicle speed and the longitudinal gradient of the long slope alignment is made to analyze the reasonable gradient at the long slope,by measuring the driver's heart-rate and the vehicle speed through the auto-recording heart-rate instrument and the motive GPS.On the basis of aboue research,the suggestion that the profile grade at the long slope alignment should not be more than 5% in the mountain highways is proposed.

It′s necessary to choose an appropriate sections to allocate road traffic detector,in order to obtain the dynamic traffic information of entire roads in the real time,and predict the traffic of junctions which have no detectors.This paper studied the spatial distribution of detectors on urban roads,which based on traffic correlation between junctions in the road network,and statistical analysis technology based on data fusion-cluster analysis and stepwise regression method.Analysis confirmed that this method is effective to optimize the detectors′ special distribution,and it provided a guarantee for the scientific and practicability of traffic data collection.

Alignment has a direct effect on the driving safety.From drivers' psychology,this paper made the study about the effect of road alignment design on dirvers' behaviors and the study about the relationship between design parameters and traffic safety from the aspect such as lines,curves,visible distance and the accordance of highway perspective,and analyzed the process of traffic accident which is caused by unreasonable design of road alignment.Based on these,in the end,it also makes a summary of the details which are easy to be ignored in the design of road alignment.

Has summarized the regular graticule mesh DEM precision influence factor,with emphasis discussed the regular graticule mesh DEM precision theoretical model (Li,1993b),has completed the Wuhan new continent phoenix Liu ties location using the numeral terrain pattern, has carried on the forecast to the precision,and has carried on the analysis with the actual statistical result.