在微表处中加入纤维,可以提高微表处的路用性能.为深入了解纤维微表处路用性能的影响因素,基于正交试验,在纤维掺量、油石比、纤维种类3个影响因素下进行湿轮磨耗试验与轮辙变形试验,并对结果进行对比分析.研究结果表明:各影响因素中,对路用性能影响程度的顺序为纤维掺量＞油石比＞纤维类型;对于纤维微表处路用性能,纤维掺量和油石比存在最佳值,当纤维掺量取0.10％～0.20％,油石比取7.0％ ～7.5％时,微表处混合料路用性能最优;而且相同条件下,聚丙烯纤维微表处路用性能更加优越.

为了深入了解影响纤维微表处路用性能的因素,通过在微表处中加入纤维,在正交试验的基础上进行了湿轮磨耗、轮辙变形试验.结果表明,加入纤维可以提高微表处的路用性能,其中对其有影响的因素有纤维参量、油石比、纤维类型,当纤维掺量为0.10％～0.20％,油石比为7.0％～7.5％,纤维类型为聚丙烯纤维时路用性能最佳.

This paper aims at shortcomings of bridge assessment method.The AHP（analytic hierarchy process） is used as the basic evaluation model,G1 method and entropy method are introduced for subjective and objective weight,and the weighting method determines the final weight by integrating the weighted linear combination method.And the bridge condition index evaluation and bridge important component defect situation evaluation of parallel comprehensive evaluation method are put forward.Through the project example,this method has simple calculation principle,less workload,reliable results.

随着我国公路事业的快速发展,小型构造物早期破损现象非常严重,已引起业界普遍关注。建立一套健全、统一、规范的施工体系,确保小型构造物的工程质量已刻不容缓。将小型预制构件工厂化施工,是实现以上目标的有效途径,它能最大限度的程序化流水作业,采用较先进的施工工艺和方法,使小型预制构件施工达到工期、质量、经济3方面的优化目标。在十天高速公路中实施取得显著成效,极具推广价值。

我国日益增长的交通量和严峻的气候变化等因素使得目前沥青混凝土路面很难满足行车安全、舒适、养护费用小等要求。在沥青混合料中添加纤维材料,可提高路面功能强度,为此本文通过对比掺加与不掺加玻璃纤维的沥青混合料各项技术性能如高温稳定性、低温抗裂性和水稳定性能,分析了沥青混合料中添加玻璃纤维的优越性。

分析了高速公路改扩建工程中常见病害产生的原因;结合改扩建工程特点,提出了不同类型病害的防治措施。

Safety evaluation for old bridge is one of the important problems in expressway expansion project.Factors that effect the safety of piers and foundation of old bridge are analyzed by the method of theoretical analysis with site investigation based on some expressway expansion project.Safety evaluation method for old bridge is put up after the least squares method in the AHP combined with fuzzy comprehensive evaluation model,the method for evaluation old bridge's safety quickly and simple is realized.

As a successful method,the dry jet mixing pile(DJMP) has been widely used to treat the soft soil foundation in many areas.Here, taking the construction of a certain highway in a loess ravine region for example,the field loading test is made for the composite foundation with DJMP,and the deformation and strength of the soil masses in the foundation before and after reinforcing are compared and analyzed,at last,some parameters are obtained,such as the foundation bearing capacity,the reducing coefficient of the soil bearing capacity between the piles,the stress ratio between the piles and soil,the deformation modulus and so on.The results show that this method could increase the deformation modulus,decrease the settlement and strengthen the stability of soft soil foundations.