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Effects of Coarse Aggregate Rap Content on the Mechanical and Shear Performance of HMA by the UPT Method 用UPT法研究粗集料Rap含量对HMA力学和剪切性能的影响
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2023-06-01 DOI: 10.2478/sjce-2023-0014
M. Khabiri, Meysam Saboohi
Abstract In recent years, the use of materials derived from recycled asphalt has attracted the attention of airfield and highway construction researchers. Since the making of these products is economically cost-effective, one idea about how to use them is to use coarse-grained crumbs from recycled Asphalt Pavement (RAP), which are agglomerates that can be found in coarse RAP, as a replacement for virgin asphalt.The goal of the current study is to investigate the performance of hot mix asphalt created with various percents of RAP. The punching shear strength of cylindrical specimens versus the penetration of steel rods with fixed and determined diameters into an asphalt specimen is one of the tests used to study the shear strength of asphalt. Other typical tests include a test of the structural strength and resilient modulus with two rectangular and sinusoidal loading shapes, respectively, as well as the specimen's strength against different temperatures of asphalt mixtures containing 10, 20, and 30% coarse-grained RAP. The results show that the resilient strength of the samples with a maximum 30% coarse-grained RAP is within reasonable limits. Furthermore, the semi-sinusoidal loading has a higher resilience modulus than rectangular loading. It is also observed during uniaxial penetration testing (UPT) that increasing the RAP increases the penetration of the steel rod, thereby implying that the shear strength of the asphalt has decreased.
摘要近年来,再生沥青材料的使用引起了机场和公路建设研究人员的注意。由于这些产品的制造在经济上具有成本效益,因此关于如何使用它们的一个想法是使用来自再生沥青路面(RAP)的粗粒碎屑,作为原始沥青的替代品,再生沥青路面是粗RAP中的团聚体。本研究的目的是研究用不同比例RAP制备的热拌沥青的性能。圆柱形试样的冲压剪切强度与具有固定和确定直径的钢条穿透沥青试样的对比是用于研究沥青剪切强度的试验之一。其他典型试验包括分别采用两种矩形和正弦加载形状的结构强度和弹性模量试验,以及含有10%、20%和30%粗粒RAP的沥青混合料在不同温度下的试样强度试验。结果表明,最大粗粒RAP含量为30%的试样的回弹强度在合理范围内。此外,半正弦加载比矩形加载具有更高的回弹模量。在单轴渗透试验(UPT)期间还观察到,增加RAP会增加钢条的渗透性,从而意味着沥青的抗剪强度已经降低。
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引用次数: 0
Dam Incidents and Failures – Cases in the Czech Republic 大坝事故和失败——捷克共和国的案例
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0003
Stanislav Kotaška, J. Říha
Abstract Dam incidents and failures mainly occur during extreme floods. In the Czech Republic (CR), large-scale regional floods were recorded in different regions in 1985, 1987, 1997, 2002, 2006, 2010, and 2013, while local floods especially occurred in 1991, 1996, 1997, 1998, 2002, 2004, 2005, 2009, and 2010. During these events, numerous incidents and total breaches of small dams were recorded, and a few large dams were also critically endangered, although they were not completely breached. This paper presents a comprehensive summary of incidents and failures affecting small dams in the CR since 1985. The most significant incidents concerning large dams are listed as well. The statistics show that 62 small dams were completely breached and that 350 were seriously damaged over 35 years in the period 1985–2020. The annual frequency amounts to 1.85 collapsed and 10 small damaged dams per year. The most common causes of the complete breaching of dams were overtopping (85 %) and internal erosion (15 %).
摘要大坝事故和溃坝主要发生在特大洪水时期。捷克共和国1985年、1987年、1997年、2002年、2006年、2010年和2013年发生了不同地区的大规模区域性洪水,而1991年、1996年、1997年、1998年、2002年、2004年、2005年、2009年和2010年发生了局地洪水。在这些事件中,记录了许多小水坝的事件和完全决口,一些大型水坝虽然没有完全决口,但也处于极度濒危状态。本文对1985年以来影响长江流域小坝的事故和溃坝进行了综合总结。还列出了与大型水坝有关的最重大事件。统计数据显示,1985年至2020年的35年间,有62座小水坝完全溃决,350座严重受损。每年有1.85座水坝倒塌,10座小型水坝受损。大坝完全决口最常见的原因是漫顶(85%)和内部侵蚀(15%)。
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引用次数: 1
A Comparison of Cadastre in Slovakia and Poland 斯洛伐克和波兰地籍制度比较
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0001
Magdalena Jurkiewicz, Ľ. Hudecová, Peter Kyseľ, P. Klapa, M. Mika, M. Ślusarski
Abstract Many analogies can be drawn from the cadastre in Poland and Slovakia, because of the partly shared history of the Austro-Hungarian Empire, World Wars I and II, and the influence of the Communist regime. However, its development over the years has taken different forms and rules of operation in both countries. Currently, from a European perspective, there are efforts to standardise cadastral systems to expand their functionality for land administration and to accommodate social needs. The aim of this article is to discuss and provide a detailed comparative analysis of the general principles of the cadastre in Slovakia and Poland. The study shows similarities but also many differences between the systems in both countries, which indicates that it could be a difficult path to unify the cadastral systems within the European Union. A comparison of the solutions used in other countries allows us to see potential opportunities for the development and modernisation of the existing cadastral systems.
波兰和斯洛伐克的地籍有很多相似之处,因为两国在一定程度上都经历过奥匈帝国、第一次和第二次世界大战以及共产主义政权的影响。然而,多年来,它的发展在两国采取了不同的形式和运作规则。目前,从欧洲的角度来看,正在努力使地籍制度标准化,以扩大其在土地管理和适应社会需要方面的功能。本文的目的是对斯洛伐克和波兰地籍的一般原则进行讨论和详细的比较分析。这项研究显示了两国的地籍制度之间的相似之处,但也有许多不同之处,这表明在欧盟内部统一地籍制度可能是一条艰难的道路。通过比较其他国家使用的解决方案,我们可以看到现有地籍制度的发展和现代化的潜在机会。
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引用次数: 1
A New Perspective on Residential Building Ventilation from the Point of View of Achieving the Desired Indoor Air Quality using Different Ventilation Systems 从不同通风系统实现理想室内空气质量的角度看住宅建筑通风的新视角
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0005
Zuzana Straková, Ju. A. Markova
Abstract The case study analyses a specifically described situation from the present and a summary of events from the past, finds alternative solutions, and decides on one of them. The target of such a detailed analysis was a concrete apartment building, which was still in the project phase; the efforts to change its proposed air conditioning system to a more energy-efficient one are the subject of the case study. Apartment buildings with modern technology installed in terms of sanitary equipment, heating, and simple methods of ventilation and cooling do not constitute part of the project. Through a detailed analysis of the calculation of the heat losses through ventilation in the case of local and decentralised ventilation applied to one apartment unit, this failure to address modern solutions is remedied.
案例研究分析了一个具体描述的现状和过去事件的总结,找到了可供选择的解决方案,并决定了其中一个。这种详细分析的目标是一个混凝土公寓大楼,它仍处于项目阶段;将其拟议中的空调系统改为更节能的空调系统的努力是案例研究的主题。在卫生设备、供暖和简单的通风和冷却方法方面安装了现代技术的公寓楼不构成该项目的一部分。通过对一个公寓单元采用局部和分散通风的情况下通过通风产生的热损失的计算的详细分析,解决了解决现代解决方案的失败。
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引用次数: 0
The Impact of Climate Change and Regulation of the Water Regime on the Morphological Structure of the Floodplain Forests in Petržalka, Slovakia 气候变化和水态调控对斯洛伐克Petržalka漫滩森林形态结构的影响
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0006
Viktória Gáspár, A. Škrinár
Abstract The main landscape-forming component has always been the forests in the lowlands. The devastation and disturbance of forest areas by anthropogenic activity change the ecological conditions in their environment. Climate and atmospheric changes affect the balance of the mutual relationships between individual components, as well as the existence of direct and feedback relationships in forest ecosystems. The transformation of bioclimatic and ecological conditions have caused the degradation of the Pannonian floodplain forest communities in Slovakia. Urbanization in Bratislava has caused the fragmentation of the surrounding forests. With changes in sunlight and heat conditions, flood-plain communities are forced to become acclimatized to drier conditions, which lead to morphological and structural changes in their composition. In this study we examined phytocenological records from 1999 to 2020 from various sources. The survey points to the impact of climate change and anthropogenic influences on biodiversity. The absence of floods and the drying of floodplain forest soils could have caused this change in the species' composition.
摘要低地森林一直是形成景观的主要成分。人为活动对林区的破坏和干扰,改变了林区环境的生态条件。气候和大气变化影响着森林生态系统中各组分之间相互关系的平衡,也影响着森林生态系统中直接关系和反馈关系的存在。生物气候和生态条件的变化导致了斯洛伐克潘诺尼亚洪泛区森林群落的退化。布拉迪斯拉发的城市化导致了周围森林的破碎。随着日照和热条件的变化,洪泛平原群落被迫适应干旱条件,从而导致其组成的形态和结构变化。在这项研究中,我们从各种来源检查了1999年至2020年的植物生物学记录。该调查指出了气候变化和人为影响对生物多样性的影响。洪水的缺乏和洪泛区森林土壤的干燥可能导致了物种组成的变化。
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引用次数: 0
Hardening Accelerators (X-Seed 100 BASF, PCC, LKD and SALT) as Strength-Enhancing Admixture Solutions for Soil Stabilization 硬化加速剂(X-Seed 100 BASF, PCC, LKD和SALT)作为土壤稳定的强度增强添加剂溶液
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0002
P. Lindh, Polina Lemenkova
Abstract This study is aimed at evaluating the strength of stabilised soil collected from the Port of Norvik, Stockholm, Sweden, where 350,000 m3 of clay had to be stabilized. The tests were performed in the laboratory of the Swedish Geotechnical Institute (SGI). The soil was stabilised by binder mixtures using Portland cement clinker (PCC) and lime and lime kiln dust (LKD). Accelerators (X-seed 100 BASF, PCC, LKD and salt) were added to the soil samples for quicker stabilization. The strength of the stabilised soil was assessed using resonance frequency measurements of seismic P-waves by an ICP accelerometer in order to estimate the shear strength of the soil and to evaluate the effects from the accelerators, binder ratios, and the curing temperature on the gains in stabilization and strength. Various proportions of the binders were tested, i.e.: 50/50 cement/lime and 50/50 PCC/lime. The temperature was measured using a calorimeter in double experiments. The results showed that the accelerators improve the strength in the stabilized specimens and enhance the soil performance for engineering construction work.
摘要本研究旨在评估从瑞典斯德哥尔摩Norvik港采集的稳定土的强度,该港需要稳定350000 m3的粘土。试验在瑞典岩土工程研究所(SGI)的实验室进行。使用波特兰水泥熟料(PCC)和石灰和石灰窑尘(LKD)的粘合剂混合物稳定土壤。将促进剂(X-seed 100 BASF、PCC、LKD和盐)添加到土壤样品中以更快地稳定。使用ICP加速度计对地震P波的共振频率测量来评估稳定土壤的强度,以估计土壤的抗剪强度,并评估加速器、粘结剂比例和固化温度对稳定和强度增益的影响。测试了不同比例的粘合剂,即:50/50水泥/石灰和50/50 PCC/石灰。在双实验中使用量热计测量温度。结果表明,加速剂提高了稳定试件的强度,提高了工程施工中的土壤性能。
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引用次数: 1
Investigation of the Effects of Additives used in Reducing Asphalt Production Temperatures 添加剂在降低沥青生产温度中的作用研究
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0004
Süleyman Nurullah Adahi Şahin, M. İpek, Mehmet Bariş Gökçek
Abstract This study is related to evaluations of the performance and usability evaluations of existing and also newly produced Warm Mixed Asphalt (WMA) additives. Viscosity, softening point, and penetration tests were performed on bitumen with additives without changing the bitumen rate for the additives. For the asphalt concrete, Marshall Stability tests were performed. WMA additives are used to reduce asphalt production temperatures and, consequently, the temperature of the mixture significantly. According to the Marshall Stability test, it was determined that the WMA samples fulfilled values within the local standards. The Hot Mixed Asphalt (HMA) and Warm Mixed Asphalt (WMA) additives were compared as to additive costs and energy savings considering the reduced production temperatures. Additives have great potential to be used in adverse weather conditions and in many countries.
摘要本研究对现有和新生产的温拌沥青(WMA)添加剂进行了性能评价和可用性评价。在不改变沥青率的情况下,对添加了添加剂的沥青进行了粘度、软化点和渗透试验。对沥青混凝土进行了马歇尔稳定性试验。WMA添加剂用于降低沥青生产温度,从而显著降低混合料的温度。根据马歇尔稳定性测试,确定WMA样品符合当地标准内的值。考虑到生产温度的降低,对热拌沥青(HMA)和温拌沥青(WMA)添加剂的成本和节能进行了比较。添加剂在许多国家的恶劣天气条件下具有巨大的应用潜力。
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引用次数: 0
Physical-Mechanical Properties of Waterproofing Materials Applied to Roofs in the Context of UV Degradation 紫外线降解条件下屋顶防水材料的物理力学性能
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0027
Jozef Kováč, M. Palko, A. Kleinová
Abstract The subject of the article is a physical-mechanical analysis of waterproofing materials exposed to an external environment. Physical and mechanical properties have a direct impact on the life of waterproofing materials and their later remediation. In the introduction, the factors influencing the properties of waterproofing materials are presented. The main part of the article covers the basic possibilities of testing the materials testing the materials, normative testing conditions, and critical aspects of their implementation. In this article we deal with the laboratory testing of a waterproofing membrane based on PVC-P in terms of its degradation from UV radiation, humidity, and the temperature.
摘要本文的主题是防水材料在外部环境下的物理力学分析。物理力学性能直接影响防水材料的使用寿命及其后期的修复。介绍了影响防水材料性能的因素。文章的主要部分涵盖了测试材料的基本可能性,测试材料的规范性测试条件,以及其实施的关键方面。在这篇文章中,我们讨论了基于PVC-P的防水膜在紫外线辐射、湿度和温度下的降解的实验室测试。
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引用次数: 0
Redesign of an Intake Fish Pass Structure 进气鱼道结构的重新设计
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0028
L. Čubanová, P. Dusicka, Martin Orfánus, J. Rumann
Abstract The article describes the process of redesigning the intake structure of the fish pass at the Žilina water structure in Slovakia. The existing intake structure does not meet the passability requirements for the target species of migratory fish. A design utilizing intake windows at various levels that cover fluctuations in the water level in the reservoir, which has been successfully used for other water structures, has been proposed. The new design was subjected to hydraulic calculations and simulations in the HECRAS 2D, 2D numerical model in order to achieve the required parameters such as the discharges, depths, and velocities within the limits for the specified fish zone.
摘要本文介绍了斯洛伐克Žilina水结构鱼道进气结构的重新设计过程。现有的进水口结构不符合目标洄游鱼类通过性要求。提出了一种利用不同水平的进水窗来覆盖水库水位波动的设计,这种设计已成功地用于其他水结构。新设计在HECRAS 2D、2D数值模型中进行了水力计算和模拟,以便在指定鱼区范围内获得所需的参数,如流量、深度和速度。
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引用次数: 1
Comparative Study of Lightweight Concretes Based on Hemp and Flax Straw 大麻与亚麻秸秆轻质混凝土的对比研究
IF 0.4 Q4 ENGINEERING, CIVIL Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0023
M. Babenko, A. Eštoková, S. Unčík, M. Savytskyi
Abstract The article presents the results of a study involving the properties of flax and hemp-based lightweight concretes as well as the initial characteristics of different straw-based materials. A comparison of straw-based lightweight concretes with and without ordinary Portland cement (OPC) showed that hemp concrete has a 5.6 % higher strength at a 10% deformation, and at the same time, has a 13% greater thermal conductivity coefficient than flax concrete. The physical-chemical study based on a thermal analysis in an air environment has shown that the overall picture of thermal degradation for flax and hemp concretes is similar. Nevertheless, additional peaks of mass loss have been defined for flax concrete. The demonstrated exothermal process is a positive aspect, considering the life cycle of the material and the recycling stage. The paper proposes reference points for the development of new building materials based on straw.
摘要本文介绍了亚麻和大麻基轻质混凝土的性能研究结果,以及不同秸秆基材料的初始特性。稻草基轻质混凝土与普通硅酸盐水泥(OPC)的比较表明,大麻混凝土在10%的变形下强度高5.6%,同时导热系数比亚麻混凝土高13%。基于空气环境中热分析的物理化学研究表明,亚麻和大麻混凝土的热降解总体情况相似。然而,已经为亚麻混凝土定义了额外的质量损失峰值。考虑到材料的生命周期和回收阶段,所展示的放热过程是一个积极的方面。本文提出了以秸秆为原料开发新型建筑材料的参考点。
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引用次数: 1
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Slovak Journal of Civil Engineering
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