###### Abstract  
Surface cracks and joint deteriorations are typical premature failures of urban cement concrete pavement. However, traffic loads on the urban pavement are much lower than those on highways. Limited research has been conducted to investigate the causes of accelerated damage in urban cement concrete roads. To investigate the foundation issues that may cause the accelerated damage of urban cement concrete pavements, in this study, field evaluations were conducted to assess pavement foundation support and drainage conditions. Field visual inspections, Ground Penetrating Radar (GPR) survey, Dynamic Cone Penetrometer (DCP) test, and the Core-Hole Permeameter (CHP) test were performed. In urban residential areas with inadequate subgrade bearing capacity, cement concrete pavements are prone to early damage. Foundations with a higher content of coarse particles exhibit a higher CBR value, which can extend the service life of the pavement. The compaction of foundation materials near swept pipelines and manholes is insufficient, leading to non-uniform support conditions. Moreover, the permeability of the foundation material can influence the service life of pavement surface structures. Foundation materials with fewer fine particles enhance drainage performance, contributing to a longer service life for PCC pavements. In areas with inadequate drainage, water accumulation reduces the bearing capacity of the foundation, thereby accelerating pavement deterioration. The poor bearing capacity and drainage conditions of the foundation lead to cavities between the surface layer and foundation material thus yielding stress concentrations on the pavement surface, which cause the formation of pavement surface cracks. urban cement concrete pavement pavement foundation; filed test; support condition; drainage +
Footnote †: journal: Medicalterm effects on PCC pavements [15; 16; 17]. [PERSON] and [PERSON] [18] replaced the original asphalt pavement at intersections with PCC pavement to tackle the issue of rutting caused by high traffic volumes and traffic loads, thereby prolonging the service life of the pavement. However, traffic loads on the urban pavement are much lower than those on highways [19]. Therefore, the insufficient foundation support or subbase stiffness of urban pavements may lead to accelerated damage and affect the service life [20; 21; 22]. [PERSON] et al. [23] discovered that the stiffness of the foundation is a crucial factor influencing the initiation of cracks in PCC slabs. This finding was substantiated through field survey experiments, which involved comparing the performance of two sections of Portland Cement Concrete pavements. [PERSON] et al. [24] found that Jointed Plain Concrete Pavement (JPCP) designs are more prone to top-down cracking when the base layer consists of untreated Open-Graded Subbase (OGS) materials due to insufficient foundation support. Therefore, it is important to investigate the causes of premature failure in PCC pavements from the perspective of base layer bearing capacity. Additionally, damage to PCC pavements can be affected by structural design and base layer drainage [25; 26; 27; 28]. [PERSON] et al. [29] evaluated the performance of unbonded concrete overlays of PCC pavements in Ohio and found that damage caused by water accumulation within the structure seriously affected its serviceability. To address the issue of water accumulation on urban roads in India during the monsoon season, [PERSON] and [PERSON] [30] constructed a permeable concrete pavement to study its permeability. Due to the large pore structure of previous concrete pavements, their strength and freeze-thaw resistance is significantly lower compared to traditional concrete pavements. This limitation hinders their widespread use [31; 32]. Moreover, highly permeable materials allow water to infiltrate the interior of the concrete, leading to the corrosion of enforcing steel, and ultimately resulting in the cracking of the road surface [33; 34; 35].