路面热再生工艺在高速公路养护中的应用及单价分析步骤

高速公路养护的核心内容是路面养护,路面的技术状况直接反应高速公路的养护质量。随着省内高速公路养护市场发展的日趋成熟,国家新的养护质量技术评定标准的颁布,随之对养护质量的要求,特别是对路面养护质量的要求也越来越严格。为了满足新的质量要求,新的养护技术、工艺、材料不断涌现,广大养护施工单位纷纷采用,其中热再生技术在高速公路路面维修和专项处理中应用得到广泛的认可。     

沥青路面使用性能评价模型与性能评价案例分析

为了客观准确了解沥青路面的实际使用性能,以便及时进行沥青路面管理与维修养护,依据检测数据对沥青路面进行了使用性能评价研究,即将主成分分析法与层次分析法相结合,建立了基于主成分-层次分析法的评价模型,并进行了评价案例分析。本研究以荣乌高速保定段2016~2019年的路面定检数据为基础,首先用主成分分析法对性能指标归类和预处理后的检测数据进行主成分提取,建立判断矩阵,再用层次分析法对各指标赋予权重系数,得到上下行路面的使用性能评价模型。选用荣乌高速检测数据进行了模型验证,并与现行《公路技术状况评定标准》评价结果相比较,评价等级高于《标准》的路段样本比例约为0.34%,低于《标准》的比例约为6.83%。本研究的评价结果更能够反映路面的实际衰变特性。     

沥青路面预防性养护的行驶质量评价

随着国民经济的快速发展,人们对公路路面行驶质量的快速、舒适、安全和经济等方面提出了更高的要求。预防性养护可以保持路面良好的服务水平,降低养护成本,延长路面使用寿命。结合预防性养护的适用条件,探讨高速公路沥青路面行驶质量的评价标准,以合理评价运营中路面的行驶质量,为预防性养护时机提供依据,具有重要的意义。     

重载作用下沥青路面结构验算方法

针对目前中国日趋严重的超载现象,为方便公路养护管理部门定期对路面结构状况进行调查评定,及时对相应路段公路进行维修养护,以现行沥青路面设计规范为基础,经过大量的数据分析对比,利用线性回归方法,获得了车辆重载运输轴载作用下的沥青路面标准轴载换算公式;同时根据沥青路面结构特点,对考虑重载作用的路面结构的验算内容和原则进行讨论和分析,最终确定以考虑超载作用的路面弯沉值、容许拉应力值、路面使用寿命及所需结构层厚度,作为沥青路面结构承载力验算的验算系统。研究结果表明:得出的沥青路面标准轴载换算公式以及沥青路面结构验算系统,对国道G108陕西渭南故市镇路段路面结构状况的调查评定是合理的,评定结果可为公路养护部门提供科学的决策依据。     

高等级公路沥青路面性能评价方法

首先将路面的使用质量评价标准定为优、良、中、次、差5个等级;再确定评价指标及评价指标的权重,并将评价指标取值范围划分为5个灰数域,对应评价标准5 个等级,建立灰色评价的指标体系;然后利用三角白化权函数确定评价指标的隶属函数,利用灰聚类的方法评定该沥青路面使用质量的等级;最后制定公路养护计划和对策。工程实例表明,高等级公路沥青路面性能在使用过程中分指标的衰减是不均衡的,评价指标越不均衡,使用规范评价方法得出的结果越不可靠;该评价方法能够准确地反映现有路面的客观实际。     

隧道复合路面基层水泥砼精细化施工关键技术

隧道复合式路面中的沥青层缓和冲击能力强,能减少路面破坏的发生,同时也使轮胎磨耗、货损等费用减少。然而,复合式路面中由于水泥混凝土面板接缝的存在,在外力荷载作用下,接缝处相邻板块产生竖向位移差,会出现较大的剪切应力,导致沥青面层中出现反射裂缝,缩短面层的使用寿命。十堰至天水高速公路(甘肃段)隧道复合路面基层水泥混凝土从施工准备、基底清理、标准带设置、混凝土拌合运输、混凝土浇注、混凝土养护6个方面进行精细化施工,有效地减少了反射裂缝的数量,延缓了反射裂缝的发展速度。     

公路沥青路面检测及养护的若干探讨

提高公路使用寿命,进行公路路面检测及养护已经成为公路养护部门刻不容缓的使命.分析当前公路沥青路面中出现的各种病害特征,着重介绍沥青路面弯沉检测技术、路面平整度检测技术、路面抗滑性检测技术、路面损坏状况检测技术的发展状况,探讨如何进行预防性公路养护的措施,客观而全面的论述如何开展公路路面维修治理工作,从而提高沥青公路的养护质量,方便车辆畅通无阻的运行.     

探地雷达在高等级公路质量检测和管理中的应用

利用探地雷达检测原理探测高等级公路路基、路面质量状况，能获知新修公路路面结构层的厚度、介电常数和旧公路路基、路面的病害与缺陷发育情况等详细信息，从而为公路管理部门对公路质量评定和养护决策优化提供科技的依据。     

浅谈沥青路面的预防性养护

预养护对策选择之前必须进行路面预养护适用性判断,以保证预养护的效果。判断的标准包括预养护的宏观路况标准和微观路况标准。预养护对策的选择过程分为三步,分别考虑技术、经济和工程因素一技术方面主要考虑路面的主导损坏类型及程度,经济方面主要考虑当量年度费用,工程方面主要考虑当地或附近可获得的材料、施工质量、耐久性、气候、交通影响、行驶舒适性、抗滑性、环保和美观等9项因素。实际应用时工程因素可根据具体情况灵活选择使用、     

对水泥砼路面预防性养护的相关探讨

路面养护在道路服务寿命中扮演着重要的角色。精心、细致、恰当的路面养护工作,不仅能减缓路面使用性能下降的速度,延长使用寿命,更能减少大中修的费用,降低道路全寿命成本。本文从路况标准、预养护对策选择和最佳预养护时机等方面出发,对水泥混凝土路面预养护技术进行了分析探讨。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the