It is widely known that vertical displacements and strains occur on the joints and these cause defects on the asphalt concrete (AC) overlays on existing Portland cement concrete (PCC) pavements. Various approaches were introduced to minimize these defects. In this study, the effect of joint support formed using the geogrid material with grout mortar on the vertical displacement of PCC and the strain at the bottom of the AC layer. Produced layers were exposed to 1,186,000 Equivalent Single Axle Load (ESAL) in an APT (Accelerated Pavement Test) facility and the results were monitored. According to the obtained results, the use of AC overlay reduces vertical displacement in the PCC by 75%. When geogrid reinforced AC overlay was used, an additional reduction in displacement by 41.2% was achieved. Geogrid reinforcement reduced strain values formed at the bottom of the AC layer from 29.5% to 92.5%. The use of geogrid at joints instead of increasing the thickness of the AC layer from 50 to 80 mm resulted a more significant reduction in both strain and displacement. Besides, the usage of a geogrid interlayer instead of increasing the thickness of the AC layer also provided a significant cost reduction of 57.9% in overall cost.

众所周知，接缝处会发生垂直位移和应变，这些会导致现有波特兰水泥混凝土 (PCC) 路面上的沥青混凝土 (AC) 覆盖层出现缺陷。引入了各种方法来最小化这些缺陷。在这项研究中，使用带有灌浆砂浆的土工格栅材料形成的联合支护对PCC垂直位移和AC层底部应变的影响。生产的层在 APT（加速路面测试）设施中暴露于 1,186,000 等效单轴负载 (ESAL) 并监测结果。根据获得的结果，AC 叠加的使用将 PCC 中的垂直位移减少了 75%。当使用土工格栅增强 AC 覆盖层时，位移额外减少了 41.2%。土工格栅加固将 AC 层底部形成的应变值从 29.5% 降低到 92.5%。在接缝处使用土工格栅而不是将 AC 层的厚度从 50 毫米增加到 80 毫米导致应变和位移的更显着降低。此外，使用土工格栅夹层而不是增加AC层的厚度也使总成本显着降低了57.9%。