Rudnicki Tomasz, Jurczak Robert
Faculty of Civil Engineering and Geodesy, Military University of Technology in Warsaw, 2 Gen. S. Kaliskiego St., 01-476 Warsaw, Poland.
Department of Road and Bridge Engineering, West Pomeranian University of Technology in Szczecin, 50 Piastow St., 70-311 Szczecin, Poland.
Materials (Basel). 2020 May 14;13(10):2262. doi: 10.3390/ma13102262.
This article presents the results of fatigue testing and assessment of the mechanical and physical properties of the concrete pavement of the A6 motorway, which was put in service in 1938. After 82 years of operation under heavy traffic loading conditions, the pavement was fully recycled by crushing of the existing concrete and reuse of the reclaimed material in the new courses of pavement placed as part of the motorway renewal project. The main objective of this research was to determine the properties of the tested concrete, including compressive strength, water absorption and freeze-thaw resistance after 150 cycles of alternate freezing and thawing. The resistance of the concrete to the action of de-icing products was also checked. The article also presents the results of petrographic analysis of the aggregates. Additionally, concrete sampled from the pavement was evaluated for freeze-thaw resistance in relation to the determined porosity characteristics. The tested concrete, which was subjected to over 80 years of traffic loading on the A6 motorway, was found to meet the highest requirements as currently applied for the extra heavy-duty pavements. With a compressive strength value in excess of 50 MPa, the tested concrete can be rated at least CC40, according to EN 13877-2:2013-08. The samples were found to satisfy the freeze-thaw resistance requirements of an F150 rating. The air void analysis showed that the analyzed concrete contained 1.6% of micropores, i.e., air voids smaller than 300 μm (A). The spacing factor, in turn, was below 0.200 mm ( = 0.185 mm). The example of the A6 motorway renewal project served to demonstrate that reclaimed concrete aggregate, obtained by crushing the entire pavement, can be used for production of the new pavement courses.
本文介绍了1938年投入使用的A6高速公路混凝土路面的疲劳测试结果以及力学和物理性能评估。在重交通荷载条件下运行82年后，该路面通过破碎现有混凝土并将回收材料重新用于作为高速公路更新项目一部分铺设的新路面层而被完全回收利用。本研究的主要目的是确定测试混凝土的性能，包括抗压强度、吸水率以及在150次冻融循环后的抗冻融性。还检查了混凝土对除冰产品作用的抗性。本文还介绍了集料的岩相分析结果。此外，根据所确定的孔隙率特性，对从路面采集的混凝土样本的抗冻融性进行了评估。经测试，在A6高速公路上承受了80多年交通荷载的混凝土符合目前对特重交通路面所适用的最高要求。根据EN 13877-2:2013-08标准，测试混凝土的抗压强度值超过50 MPa，至少可评为CC40。样本被发现满足F150等级的抗冻融性要求。气孔分析表明，所分析的混凝土含有1.6%的微孔，即小于300μm的气孔（A）。而间距系数低于0.200mm（=0.185mm）。A6高速公路更新项目的实例表明，通过破碎整个路面获得的再生混凝土集料可用于生产新的路面层。
