基于GTM法的温拌胶粉改性沥青混合料研究

结合温拌胶粉改性沥青混合料的科研成果,介绍了基于GTM法的温拌胶粉改性沥青混合料设计,及不同胶粉掺量的温拌胶粉改性沥青混合料路用性能测试分析。结果表明：在使用温拌技术降低了胶粉改性沥青混合料拌和温度40℃的前提下,胶粉掺量为15％～21％的温拌胶粉改性沥青混合料的路用性能能较好地满足规范要求。     

BRA及BRA复配SBS改性温拌沥青混合料配合比设计与性能评价

为了合理确定温拌布墩岩沥青(BRA)混合料的最佳拌和压实温度,评价BRA及BRA复配SBS改性温拌沥青混合料的路用性能和水温耦合作用下的耐久性。对不同压实温度下的温拌和热拌BRA改性沥青混合料试件的空隙率进行对比分析,并通过车辙试验、低温弯曲试验、浸水马歇尔试验、冻融劈裂试验及汉堡车辙试验研究了温拌BRA改性沥青混合料的路用性能。结果表明,采用"等空隙率法"确定温拌BRA改性沥青混合料拌和压实温度合理可行;随着BRA掺量增大,BRA和BRA复配SBS温拌改性沥青混合料的高温稳定性和水稳定性显著提高;在高温多雨地区推广应用BRA复配SBS温拌沥青混合料具有较好的技术优越性;实际工程中建议BRA的适宜掺量为20%。     

基于GTM法的温拌胶粉改性沥青混合料设计研究

采用GTM（旋转试验机）法,以试件体积参数相等为判据,综合确定Evotherm温拌胶粉改性沥青混合料的适宜成型温度和拌和温度.采用两阶段设计法,基于双参数体系,以热拌胶粉改性沥青混合料配比设计数据为基础,对Evotherm温拌胶粉改性沥青混合料沥青用量和试验温度进行设计,从材料组成和体积参数两方面来双重保证其路用性能.然后,对所设计的Evotherm温拌胶粉改性沥青混合料进行路用性能试验并与对应的热拌胶粉改性沥青混合料对比分析.结果表明：与马歇尔法相比,GTM法可以降低Evotherm温拌胶粉改性沥青混合料的适宜成型温度;GTM法所设计的Evotherm温拌胶粉改性沥青混合料的高、低温性能及抗水损害性能均优于热拌胶粉改性沥青混合料,而且,其抗压回弹模量与热拌胶粉改性沥青混合料基本相当,不影响路面结构设计.     

DS-TL02温拌剂对SBS改性沥青混合料的性能影响

为了研究DS-TL02温拌剂对SBS改性沥青混合料的性能影响,将DS-TL02温拌剂掺入SBS改性沥青混合料中制备成温拌沥青混合料,研究其降温效果、高温稳定性、水稳定性。降温效果通过确定DS-TL02温拌沥青混合料的压实温度来分析,高温稳定性采用车辙试验来评价,水稳定性采用冻融劈裂试验来评价。试验结果显示:DS-TL02温拌沥青混合料的压实温度较SBS改性沥青混合料的降低了15℃,降温效果明显;而高温稳定性和水稳定性分别比SBS改性沥青混合料提高了15.77%和6.15%的幅度,这一结果为今后在SBS改性沥青路面上使用DS-TL02温拌剂提供了室内试验依据。     

新型温拌改性沥青路面施工工艺与分析

为了解决热拌沥青路面材料能耗大、污染大的问题,研究新型温拌沥青混合料,该沥青混合料性能良好、节能减排。研究了新型温拌沥青混合料的施工工艺,结论是新型的ACMP温拌改性沥青混合料施工简单,适应性更好,推广应用前景良好。     

公路工程中温拌改性沥青混合料的应用技术探究

本文主要是以温拌橡胶沥青混合料为例对公路工程中温拌改性沥青混合料的应用技术进行了探究.     

ACMP温拌改性沥青就地温拌再生案例与分析

为了研究沥青温拌再生技术,研究ACMP温拌改性沥青就地温拌再生试验路段,并对案例加以分析。研究认为沥青温拌技术比较环保,沥青再生技术符合循环经济发展要求,温拌再生技术的环保意义更加突出。从技术路线角度分析,ACMP温拌改性沥青比较适合用于旧沥青混合料再生。本文研究的案例及其分析,可以供其他类似工程参考。     

EC120温拌改性沥青混合料应用研究

结合云南普炭一级公路项目建设,对EC120温拌改性沥青混合料的应用技术包括配合比设计、施工工艺和性能评价指标进行了研究.其结果表明,EC120温拌改性沥青混合料的拌合、摊铺及碾压的温度介于热拌热铺和冷拌冷铺之间,既结合了两者的优点,同时又避开了双方的缺点,有效解决了能源消耗和二氧化碳等温室气体排放难题,并具有与热拌沥青混合料一样优良的施工和易性和路用性能.     

USP 温拌改性沥青混合料施工技术研究

从原材料选择和配合比设计、施工准备、施工工艺等环节出发,分析了USP温拌改性沥青混合料的施工技术,研究表明：USP温拌改性沥青混合料应严格控制集料含水量和粉尘含量;拌和时间延长10 s左右;压实后养生24 h,再进行二次碾压。     

一种温拌剂对普通沥青和SBS改性沥青混合料的降温效果评价

首先介绍了采用温拌剂的必要性,其次进行了温拌降黏材料Sasobit应用于普通沥青和SBS改性沥青后的黏温曲线试验和沥青混合料体积特性试验,最后对两者的降温效果进行了评价。试验表明,Sasobit温拌沥青混合料可节约燃油,大大减小对施工人员身体健康的危害。     

污泥制砖存在问题浅析

污泥制砖符合国家的环保政策,但在技术方面还待进一步创新和突破。为此分析了污泥制砖在技术方面、环保方面和社会大众认可方面存在问题及相应的改进措施。     

干旱区绿洲环境下的新疆小城镇建设投资

一、研究区域基本现状新疆地处欧亚大陆腹地,地貌轮廓表现为“三山夹两盆”,山地与平原的面积大致各占50%,镶嵌于戈壁沙漠的绿洲仅有7万平方公里。新疆土地面积166.49万平方公里,占全国总面积的六分之一。气候干旱,荒漠广布,是中国最大的干旱区,是亚洲干旱核心区,也是世界上著名的干旱区之一。水资源短缺,生态极度脆弱。新疆2004年底有1950万人,人均GDP已经超过了1000美元,城镇化进入了快速发展阶段,特别是小城镇的发展速度较快。但新疆特殊的干旱区绿洲环境,使得小城镇的发展存在许多问题。一是城镇规模小而散,基础设施配套差,城镇集散和…     

Levels of manganese in the urine of female farmers in non-polluted regions in Japan

Nearly 1500 urine samples were collected from female farmers in eight regions widely scattered in the islands of Japan in the winter of 1987-1988. The samples were analysed for manganese by wet ashing and flameless atomic absorption spectrophotometry under strict quality control. The values observed after adjustment for a specific gravity of 1.016 were distributed log-normally with a geometric mean of 0.65 microgram/l and a geometric standard deviation of 2.47. There was no effect of aging or any effect of smoking on the urinary manganese concentration. The inter-regional difference may be present but not yet conclusive. As no sex difference was observed in a previous study, it may be possible to deduce that the value may possibly stand for the "background" level of both men and women, either smoking or non-smoking, among the general Japanese population. The observed value is discussed in comparison with values reported in the literature.     

Typification of Fires in Buildings in Spain

Although the Dirección de General de Protección Civil (DGPC), an agency of the Spanish government, has been responsible for the collection of data and the statistical analysis of fires since 1985, it has not as yet issued any reports. It is true that a couple of studies have been made, but in neither case did they use a standardized methodology but relied simply on the heterogeneous information provided by the fire brigades which cooperated in the studies. At that time Spanish fire brigades did not have special units for professional fire investigation, nor was the information derived from standardized methodologies suited to research purposes. In addition, information was extremely scarce and basic, focussed only on the fire, the use of the building and personal data of the victims. In this context, the project for a Fire Investigation Unit in the Fire Brigade of Málaga (the sixth largest Spanish province in inhabitants) was set up. Although inspired in the methodologies used in the USA and in the UK, the aim was to create a customized methodology for the first scientific investigation of fires in Spain. Our research was conducted in 2007. Using the methodologies of the USA and the UK, our own methodological approach and the Spanish regulations, we drew up a questionnaire with 110 variables arranged into 6 modules. We studied 96 fires out of the 154 emergency fire calls received in 2007, having omitted some emergency calls for various reasons. Our results revealed that it was necessary to generalize the installation of fire extinguishers in residential buildings, to train the general public in the use of these devices, to promote the use of fire and smoke detectors in residential buildings, to encourage the inspection and control of old electric installations and to monitor the new installations, to generalize the implementation of emergency and evacuation plans and to design new systems and materials for the cabinets where hand-held extinguishers are stored.     

分光光度法测水中余氯

介绍了用双硫腙分光光度法测定水中余氯的新方法，阐述了其测定试验过程，根据试验结果显示，其结论符合国家标准，表明该方法可用于自来水等样品中余氯含量的测定，结果比较准确。     

莳花在城市绿化中的应用

目的:花化、香化、彩化已成为城市园林绿化的主要趋势,也是为满足人们对环境要求越来越高的一种心境。方法:选择采用莳花能表现出品种繁多,色彩艳丽等不同的方式,从而能在很大程度上丰富了植物造景的层次感要求。结果:能使其达到美化环境、增添节日气氛、提高绿化品质等方面有着突出的作用。结论:莳花造景对城市的美化可达到立杆见影效果,从而提高城市的形象和品位。     

遗传算法在边坡稳定系数计算中的应用

边坡稳定性的关键问题是确定最危险滑动面(潜在最危险滑动面)和边坡的稳定系数。国内外一般是采用先假定边坡滑移模式,然后近似确定最危险滑动面,再求近似的边坡稳定系数的方法来分析边坡的稳定性,但假设的边坡滑移模式难以反映边坡滑移的实际状态。因此本文探索利用遗传算法搜索最危险滑动面,并得到最小稳定系数及对应的最危险滑动面曲线,取得了较好的效果。     

Intersections of inequality in homeownership in Sweden

Abstract

Inequalities relating to ownership of housing have become a major issue de jour in many Western societies. This article examines how the distribution of homeownership in Sweden relates to two factors widely seen as significant to such inequalities, namely parental tenure status and place of birth. We use longitudinal registry data to examine the bearing of these two factors on individual-level tenure progression since the beginning of the 1990s for persons at different stages of their housing careers. We extend existing understandings of Swedish homeownership patterns by demonstrating that inequalities relating to place of birth and parental tenure intersect with one another in ways that substantially advantage certain subgroups while disadvantaging others, and by demonstrating that experiences of entry into homeownership have in recent years been changing in markedly different ways for these different subgroups. Overall, Swedish homeownership inequalities, far from dissipating, appear to be hardening along existing lines.     

日本城市浅层地下空间利用的新成就

本文结合日本川崎市站前广场和神户市哈巴兰德地区的立体化再开发，分析介绍当前日本浅层地下空间开发利用的成就和特点。     

山地村镇建设在中国城市化发展中的地位

一、中国山地的重要性 山地其在《地理学词典》中的定义是:“许多山的通称,由山岭和山谷组成。其特点是具有较大的绝对高度和相对高度,切割深,切割密度大……”,在《中国百科全书》中又称“广义的山地包括山、高原和丘陵三部分”。在本论文中,“山地”是一个有关建设用地的概念。它不仅包括其地理学上的含义,而且也是一个广义的山地概念,即同时代表山地,高原和丘陵地带,不论其是在坡地或局部平地上。