A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sealing of Small Movement Bridge Expansion Joints
Sealing of bridge expansion joint systems is important to protect the structural components below the joint from damage due to water, salt, and other roadway debris. A new elastomeric foam-type joint sealant has been developed for sealing small-movement bridge expansion joints. Laboratory tests including tension, compression, shear, bonding, salt water immersion, temperature sensitivity, compression recovery, creep, stress relaxation, cure rate, tack time, and water tightness were performed on this newly developed sealant to assess its mechanical and material characteristics. In addition, loading-unloading behavior in tension and compression and effects of exposure to outdoor condition for 6.5 months period on its engineering properties were investigated. Similar tests were also performed on a currently available commercial bridge joint sealant material for comparison purposes. The new silicone foam sealant showed an increase in volume by about 70% after the mixing of sealant components. The test results indicated lower stiffness, greater extensibility, and better bonding associated with the foam sealant compared to the commercial sealant. Foam sealant showed more resistant to fatigue with tensile deformation cycles and its stress relaxation rate was greater than that of commercial sealant. The tack and cure time for foam sealant were small and no leakage was observed through the sealant and joint interface. The sealant also did not exhibit any physical deterioration during prolonged exposure to natural weathering elements; however it appeared to stiffen which might be due to oxidation and continuous sealant cure.
Sealing of Small Movement Bridge Expansion Joints
Sealing of bridge expansion joint systems is important to protect the structural components below the joint from damage due to water, salt, and other roadway debris. A new elastomeric foam-type joint sealant has been developed for sealing small-movement bridge expansion joints. Laboratory tests including tension, compression, shear, bonding, salt water immersion, temperature sensitivity, compression recovery, creep, stress relaxation, cure rate, tack time, and water tightness were performed on this newly developed sealant to assess its mechanical and material characteristics. In addition, loading-unloading behavior in tension and compression and effects of exposure to outdoor condition for 6.5 months period on its engineering properties were investigated. Similar tests were also performed on a currently available commercial bridge joint sealant material for comparison purposes. The new silicone foam sealant showed an increase in volume by about 70% after the mixing of sealant components. The test results indicated lower stiffness, greater extensibility, and better bonding associated with the foam sealant compared to the commercial sealant. Foam sealant showed more resistant to fatigue with tensile deformation cycles and its stress relaxation rate was greater than that of commercial sealant. The tack and cure time for foam sealant were small and no leakage was observed through the sealant and joint interface. The sealant also did not exhibit any physical deterioration during prolonged exposure to natural weathering elements; however it appeared to stiffen which might be due to oxidation and continuous sealant cure.
Sealing of Small Movement Bridge Expansion Joints
R. B. Malla (author) / M. T. Shaw (author) / M. R. Shrestha (author) / S. Boob (author)
2006
116 pages
Report
No indication
English
Highway Engineering , Construction Equipment, Materials, & Supplies , Structural Analyses , Bridge decks , Expansion joints , Pavements , Sealing , Elastomers , Foams , Stress analysis , Strain , Tension , Bonding , Sealers , Compression , Laboratory tests , Dynamical structural analysis , Comparisons , Deformation , Durability
Annual Movement Study of Bridge Deck Expansion Joints
| NTIS | 1969
Sealing bridge and pavement joints
| TIBKAT | 1984
Sealing Bridge and Pavement Joints
| NTIS | 1984