1. PRODUCT OVERVIEW VHR steel strip-seal joint made by Vinh Hung Investment and Production Co., Ltd (Vinh Hung IP) comprises of two steel rails with anchor bars connected to embedded bars in the pier cap of headwall of abutment, elastomeric strip serves as the trough for drainage and debris, nosing materials: non-shrink mortar or concrete with minimum compressive strength of 40MPa. There are 2 main types of VHR expansion joint identified by the cross section of the steel rails: VHR-C steel rail expansion joint and VHR-F steel rail expansion joint. 2. PRODUCT CHARACTERISTICS Totally accommodate to longitudinal movement up to 100mm, and also vertical and transverse movements if any. Simple in design and installation, high load capacity and durability. Designed suitably for flush curb and central reverse. Totally water-tight. To ensure the long-lasting durability, VHR steel strip expansion joints are protected from corrosion with methods such as: 2-component epoxy coating, PU-based painting (Polyurethane), hot dip galvanization according to ASTM A123 standards and especially the Al â?? Mg spraying method (at the ratio of 5% Al and 95% Mg) which ensures anti-corrosion durability of up to 100 years, proven by salt-spraying test in 6000 hours (8-hour dry-wet cycle repetition) under ASTM B117 standards. MATERIAL PARAMETERS 1. PROPERTIES OF METAL ELEMENTS ITEMS Tensile strength, min Yield strength, min Elongation, min NO. 1 2 3 REQUIREMENTS 450 345 23 UNIT MPa MPa % STANDARD ASTM A709M PROPERTIES OF RUBBER SEAL UNIT REQUIREMENTS Point Mpa 1 2 3 4 5 Hardness Tensile strength, min Ozone resistance, content of ozone in the air 100pphm, 20% deformed at 40o C x 70h Elongation at break, min Hot air aging test in 70 hours at 100o C Tensile strength change, max Elongation change, max Hardness change 65 ± 5 7 No crack 250 - 20 - 40 0 - 15 STANDARD ASTM D2240 ASTM D412 ASTM D1149 ASTM D412 ASTM D573 ASTM D573 ASTM D573 ASTM D573 Installation of joints is critical to ensure the lifespan of the expansion joint and smooth traffic. Careful preparation of machinery, equipment, and highly specialized human resources is required for the installation of high quality expansion joints. The installation method shall be strictly followed to guarantee the actual performance of the product in service. 1. After finishing pavement, cut and clean he trend, adjust embedded bars, laym reinforcement bars on site 2 . Fix the deformed bars, install the fabricated joints, add distribution bars, anchoring bars to embedded bars. 3. Cure concrete, install rubber seal, allow traffic when concrete 4. Install formworks and pour non-shrink mortar or high-strength concrete to transition section, check the leveling of surface.
