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.
