asphalt concrete pavement
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2021 ◽  
Vol 13 (24) ◽  
pp. 13828
Author(s):  
Yu Wang ◽  
Roaa H. Latief ◽  
Hasan Al-Mosawe ◽  
Hussein K. Mohammad ◽  
Amjad Albayati ◽  
...  

Recently, interest in the use of projectiles in research on recycling waste materials for construction applications has grown. Using recycled materials for the construction of asphalt concrete pavement, in the meantime, has become a topic of research due to its significant benefits, such as cost savings and reduced environmental impacts. This study reports on comprehensive experimental research conducted using a typical mechanical milling waste, iron filing waste (IFW), as an alternative fine aggregate for warm mix asphalt (WMA) for pavement wearing surface applications. A type of IFW from a local machine workshop was used to replace the conventional fine aggregate, fine natural sand (FNS), at percentages of 25%, 50% 75%, and 100% by the weight of FNS of the size passing sieve No. 50. Experimental tests were conducted on the mixes to compare their Marshall properties, resilient moduli, rutting and fatigue resistance, and moisture susceptibility. Finally, a performance analysis was carried out using the VESYS 5W software on the constructed pavement using the IFW mixes. Both the experiment and the modeling work demonstrated that IFW can be an effective alternative resource for replacing natural fine aggregate in WMA concrete and provided details on the optimum rate based on the comprehensive data obtained first hand.


Buildings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 577
Author(s):  
Ziyuan Ma ◽  
Jingxiao Zhang ◽  
Simon P. Philbin ◽  
Hui Li ◽  
Jie Yang ◽  
...  

With the rapid development of new technologies, such as big data, the Internet of Things (IoT) and intelligent sensing, the traditional asphalt pavement construction quality evaluation method has been unable to meet the needs of road digital construction. At the same time, the development of such technologies enables a new management system for asphalt pavement construction. In this study, firstly, the dynamic quality monitoring system of asphalt concrete pavement is established by adopting the BeiDou Navigation Satellite System, intelligent sensing, the IoT and 5G technology. This allows key technical indicators to be collected and transmitted for the whole process of asphalt mixture, which includes the mixing plant, transport vehicle, paving and compaction. Secondly, combined with AHP and the entropy weight (EW) method, the index combination weight is calculated. The comprehensive index for the pavement digital construction quality index (PCQ) is proposed to reflect the impact of monitoring indicators on pavement quality. An expert decision-making model is formed by using the improved particle swarm optimization (PSO) algorithm coupled with radial basis function neural network (RBF). Finally, the digital monitoring index and pavement performance index are connected to establish a full-time and multi-dimensional digital construction quality evaluation model. This study is verified by a database created from the digital monitoring data of pavement construction collected from a highway construction project. The system proposed in this study can accurately reflect the quality of pavement digital construction and solve the lag problem existing in the feedback of construction site.


2021 ◽  
Author(s):  
Kun Wang ◽  
Mingjun Wu ◽  
Peng Hu ◽  
Baoqun Wang

In order to study the mechanism of water damage of an asphalt pavement, the FLAC3D program was adopted to model and analyze the mechanical response of a saturated asphalt pavement under instantaneous vehicle load. The results show that the horizontal stress, vertical stress and shear stress of an asphalt concrete pavement increase with the increase of instantaneous load. The surfaces of asphalt pavement structural layers are most vulnerable to damage. The horizontal stress, vertical stress and shear stress decrease sharply with the instantaneous dynamic load decreasing to zero. The horizontal stress reaches maximum value at the interface between the base and the large stone porous mixture (LSPM) layer, while the maximum vertical and shear stresses occur on the surface layer of the saturated asphalt pavement. The deformation decreases almost linearly from the surface of the asphalt pavement to the subgrade, and the pore water pressure was little influenced by the transient load.


2021 ◽  
pp. 1219-1225
Author(s):  
Cyrille Chazallon ◽  
Julien Van Rompu ◽  
Mai Lan Nguyen ◽  
Pierre Hornych ◽  
S. Mouhoubi ◽  
...  

Author(s):  
В. В. Волков ◽  
В. А. Козлов ◽  
В. Н. Мелькумов

Постановка задачи. Целью исследования является выявление влияния увлажненного покрытия на его износ. Рассматривается механизм воздействия транспортной нагрузки в присутствии влаги и экспериментальные методы измерения ее воздействия на износ верхнего слоя асфальтобетона. Результаты. Определен вклад наличия влаги в верхнем слоя дорожного покрытия на его износ в виде образования колеи, исследовано гидродинамическое воздействие воды в микропорах покрытия. Получены экспериментальные данные величин давления воды в порах асфальтобетонного покрытия в увлажненном состоянии под действием колес движущегося транспортного потока. Это позволило определить максимальные величины барического воздействия, глубину проникновения фронта давления жидкости и влияние его на разрушение покрытия. Выводы. Анализ полученных данных показал не только наличие хрупкого разрушения, но и наличие ударного воздействия движущейся в порах асфальтобетона влаги, превышающего его структурную прочность. С использованием экспериментальных данных получены регрессионные зависимости величины износа от стандартных параметров потока. Для эксплуатируемых покрытий регрессионная зависимость позволяет прогнозировать величину износа на весь жизненный цикл дороги. Statement of the problem. The purpose of the study is to identify the effect of a wetted surfacing on its wear and tear. The mechanism of the effect of transport load in the presence of moisture and experimental methods of measuring its effect on the wear of the upper layer of asphalt concrete are discussed. Results. The contribution of the presence of moisture in the upper layer of the road surface to its wear and tear in the form of rutting is identified, and the hydrodynamic effect of water in the micropores of the surface is examined. Experimental data on the values of water pressure in the pores of an asphalt concrete pavement in a wet state under the action of the wheels of a moving traffic stream have been obtained. This made it possible to identify the maximum values of the pressure effect, the depth of penetration of the liquid pressure front and its influence on the destruction of a surfacing. Conclusions. Analysis of the obtained data showed not only the presence of brittle fracture, but also an impact effect of moisture moving in the pores of asphalt concrete exceeding its structural strength. Using the experimental data, regression dependences of the wear and tear value on the standard flow parameters were obtained. For the pavements in use, the regression dependence makes it possible to predict the amount of wear and tear for the entire life cycle of the road.


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