A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Performance Evaluation of Pavement Subgrade by In Situ Moisture and Matric Suction Measurements
Most of the pavements in North Texas are constructed over highly expansive clayey subgrade which are severely affected by seasonal swelling and shrinkage. The clayey subgrade soil swells as the moisture intrusion takes place and shrinks with the loss of moisture. Due to repeated swelling and shrinkage, the serviceability of the pavement is compromised along with the alteration in the soil properties. The monitoring of moisture variation in the unsaturated soil subgrade is therefore required to predict the changes in subgrade soil properties. The objective of the current paper is to evaluate the actual variation of moisture and suction in the pavement subgrade through field instrumentation and to correlate it with the pavement performance. For this purpose, a pavement site SH342 in North Texas was instrumented with moisture and suction sensors in the grassy side slope. Resistivity imaging was also conducted to obtain the continuous portrayal of the subsurface moisture condition. Additionally, an inclinometer was installed across the pavement to evaluate the deformation of pavement with time. Based on field data during the last two years, the increase in moisture content was up to 15% due to rainfall events while the suction values increased to 1200 kPa during dry summer.
Performance Evaluation of Pavement Subgrade by In Situ Moisture and Matric Suction Measurements
Most of the pavements in North Texas are constructed over highly expansive clayey subgrade which are severely affected by seasonal swelling and shrinkage. The clayey subgrade soil swells as the moisture intrusion takes place and shrinks with the loss of moisture. Due to repeated swelling and shrinkage, the serviceability of the pavement is compromised along with the alteration in the soil properties. The monitoring of moisture variation in the unsaturated soil subgrade is therefore required to predict the changes in subgrade soil properties. The objective of the current paper is to evaluate the actual variation of moisture and suction in the pavement subgrade through field instrumentation and to correlate it with the pavement performance. For this purpose, a pavement site SH342 in North Texas was instrumented with moisture and suction sensors in the grassy side slope. Resistivity imaging was also conducted to obtain the continuous portrayal of the subsurface moisture condition. Additionally, an inclinometer was installed across the pavement to evaluate the deformation of pavement with time. Based on field data during the last two years, the increase in moisture content was up to 15% due to rainfall events while the suction values increased to 1200 kPa during dry summer.
Performance Evaluation of Pavement Subgrade by In Situ Moisture and Matric Suction Measurements
Pandey, Pratibha (author) / Ahmed, Asif (author) / Sapkota, Anuja (author) / Hossain, Md. Sahadat (author) / Thian, Boon (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 347-356
2019-03-21
Conference paper
Electronic Resource
English
Performance Evaluation of Pavement Subgrade by In Situ Moisture and Matric Suction Measurements
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