Skid Resistance Analysis of Thermoplastic Pavement Marking
| Autor: | Dong-Xu Jiang, 江東旭 |
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| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 Pavement marking is one of the traffic facilities to ensure the safety of road users. It has four major functions: directing, warning, prohibiting and guiding. When the surface of thermoplastic pavement marking becomes wet, its skid resistance value will be low. This may cause the two wheeled vehicle, such as motorbike, increases its risk of sliding on the pavement marking. The CNS 4342 standard proposes that adding glass beads to increase the retroreflectivity has been clearly defined, and in recent years the CNS 15834 has also classified the retroreflectivity and skid resistance. The purpose of this study is to investigate how pre-mixing and drop-on of reflective glass beads influence the pavement marking skid resistance, and whether the skid resistance of the pavement marking can be improved by adding or spreading other anti-skid materials. This study discusses material combinations that can improve the skid resistance of thermoplastic marking while guaranteeing retroreflective properties. First, test site of77 thermoplastic marking samples with different kinds of admixture and amount was conducted at the National Taiwan University campus. Survey of skid resistance by using British Pendulum Tester was followed for two months. The preliminary conclusion indicates that the drop-on materials of 50%-50% combination of high reflective index glass beads and quartz sand can provide the best results of both retroreflectivity and skid resistance. Several pavement marking samples of different proportions were placed in four geographic regions, i.e. metropolitan, plain, hill, and mountain. Both retroreflectivity and skid resistance were tested continuously for 8 months. According to the samples’ performance, the cost-benefit analysis algorithm was developed. This study suggested adding 10% weight ratio of high retroreflectivity glass beads, and 30% weight ratio of CNS type I glass beads as the pre-mix additives. It also suggests the proper drop-on high reflective glass beads and small quartz sand should be 50%-50% weight ratio of 300 grams per square meter. According to the long-term field performance for 8 months, the suggested combination can provide BPN 55 as initial resistance value and remain about BPN 50 after 8 months. This study suggests that the pavement marking skid resistance initial value and maintenance threshold should be increased in Taiwan. According to different geographical regions, the skid resistance thresholds should be different from region to region, and regular inspection is also recommended for maintaining its required performance. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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