한국도로학회논문집 제20권 제6호 (p.89-99)

노후화된 무근콘크리트줄눈포장(JPCP) 절삭덧씌우기 구간 장기공용성 평가

Long-Term Performance Evaluation of Concrete Pavement Overlay on Deteriorated Jointed Plain Concrete Pavement
키워드 :
deteriorated JPCP,overlay,joint,partial depth repair,long-term performance,durability

목차

ABSTRACT
1. 서론
2. 국도 37호선 서파-일동 교차로 콘크리트포장 노후화
3. 콘크리트 포장 절삭 덧씌우기 시험시공
  3.1. 시공 전 표면처리 결과
  3.2. 재료 물성 평가
  3.3. 초기 공용성 평가
4. 절삭 덧씌우기 구간 장기공용성 평가
  4.1. 노면 파손 평가
  4.2. 노면 파손 이력 분석
  4.3. 비파괴 장비(FWD)를 이용한 공용성 평가
5. 결론
REFERENCES

초록

PURPOSES: The purpose of this study is to determine the effective maintenance method for a deteriorated jointed plain concrete pavement by evaluating the long-term performance of the repaired concrete overlay sections.
METHODS: Long-term performance evaluation was conducted for the test section at the intersection between SeoPa and IlDong in National Road No. 37. Firstly, the distress conditions of the concrete pavement, which was constructed in December 2003, were evaluated by referring to the existing report. Secondly, the results of pretreatment, material properties, and initial performance evaluation were analyzed for the overlay test conducted in 2011. Finally, a field survey was carried out using visual inspection and nondestructive testing with a FWD in August 2018, and long-term performance evaluation was conducted for about seven years after maintenance.
RESULTS: Visual inspection of the old concrete pavement showed severe damage such as joint spalling and asphalt patching. The cores taken from the old concrete had indirect tensile strength of 2.6-3.8 MPa. It is difficult to determine the freeze-thaw resistance because the average amount of air was only 1.6-2.2%, and spacing factor values were over 400㎛ regardless of location. During maintenance, overlay and partial depth repair were performed by applying three types of overlay materials which are typical in Korea. On the material side, high compressive strength (over 40 MPa) and chlorine ion penetration resistance (less than 1,000 coulomb) at 56 days were achieved. In August 2018, seven years after maintenance, visual inspection and nondestructive testing using FWD were conducted for long-term performance evaluation. Regardless of the maintenance materials, surface deficiencies such as spalling and map cracking occurred extensively near the joint.
CONCLUSIONS: In conclusion, if the strength and durability index of aged concrete pavement is low, then it was determined that partial depth repair at the joint is not an effective maintenance alternative. In the case of overlay, the durability of the overlay material is considered the most important factor. In the absence of adequate reinforcement at the joint of the distressed concrete pavement, freeze-thaw damage caused by moisture penetration through the joint and failure of the old concrete are repeated, making it difficult to ensure long-term durability.