A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Mitigation of Subgrade Moisture in North Texas by Using Modified Moisture Barrier
In addition to causing shrinkage and swelling in expansive subgrade, seasonal moisture variations may alter material properties, hence pavement serviceability. In order to prevent moisture variation in the subgrade, moisture barriers may be used. The current study observes the effects of a modified moisture barrier on subgrade moisture control. The modified moisture barrier that is used in this study is a combination of a 40-mi LLDPE (linear low density polyethylene) geomembrane and an 8-oz. HDPE (high density polyehtylene) geocomposite. In-situ moisture sensors were employed to observe subgrade moisture variation. Edge moisture intrusion was observed along farm-to-market (FM) 987 near Kaufman, Texas. Based on the observation of edge moisture intrusion, the moisture barrier consisting of a geomembrane and a geocomposite (geonet sandwiched between two nonoven geotextiles) was placed in a 50-ft section of FM 987. A 50-ft control section was also established along the roadway. Moisture sensors in both the barrier and control sections continuously monitor the moisture content of the subgrade soil. In the barrier section, preliminary results indicate a steady moisture content which is not influenced by rainfall. In the control section, the moisture content levels are influeced by rainfall. This ongoing study shows promise for using the modified moisture barrier to prevent subgrade moisture intrusion and provide for better pavement serviceability.
Mitigation of Subgrade Moisture in North Texas by Using Modified Moisture Barrier
In addition to causing shrinkage and swelling in expansive subgrade, seasonal moisture variations may alter material properties, hence pavement serviceability. In order to prevent moisture variation in the subgrade, moisture barriers may be used. The current study observes the effects of a modified moisture barrier on subgrade moisture control. The modified moisture barrier that is used in this study is a combination of a 40-mi LLDPE (linear low density polyethylene) geomembrane and an 8-oz. HDPE (high density polyehtylene) geocomposite. In-situ moisture sensors were employed to observe subgrade moisture variation. Edge moisture intrusion was observed along farm-to-market (FM) 987 near Kaufman, Texas. Based on the observation of edge moisture intrusion, the moisture barrier consisting of a geomembrane and a geocomposite (geonet sandwiched between two nonoven geotextiles) was placed in a 50-ft section of FM 987. A 50-ft control section was also established along the roadway. Moisture sensors in both the barrier and control sections continuously monitor the moisture content of the subgrade soil. In the barrier section, preliminary results indicate a steady moisture content which is not influenced by rainfall. In the control section, the moisture content levels are influeced by rainfall. This ongoing study shows promise for using the modified moisture barrier to prevent subgrade moisture intrusion and provide for better pavement serviceability.
Mitigation of Subgrade Moisture in North Texas by Using Modified Moisture Barrier
Ahmed, Asif (author) / Hossain, MD Sahadat (author) / Greenwood, Kelli (author) / Khan, Mohammad Sadik (author)
IFCEE 2018 ; 2018 ; Orlando, Florida
IFCEE 2018 ; 445-454
2018-06-06
Conference paper
Electronic Resource
English
Mitigation of Subgrade Moisture in North Texas by Using Modified Moisture Barrier
| British Library Conference Proceedings | 2018
| NTIS | 1970
| Engineering Index Backfile | 1946
Moisture Flow in Unsaturated Subgrade Soils
| British Library Conference Proceedings | 2011