Hilti Development Fastening Systems
Hilti HIT-RE 500 for “Underwater Fastenings”
From: Date: Page:
DMPg August 31, 2001 1/5
Hilti HIT-RE 500 Hilti HIT-RE 500 Injection Adhesive for "Underwater Fastenings“ General information: Hilti HIT-RE 500 injection adhesive performs well in wet or water-filled holes. With this in mind, several test series were carried out to evaluate the performance of HIT-RE 500 in water at depths of up to 50 metres. The test programme consisted of: test with 2 different anchor sizes and 2 different types of f asteners, - short-term pull-out test with i.e. threaded rods and rebars. rebars. tests with threaded rods and rebars. - long-term creep tests with run in a pressure chamber up to 50 m under un der water to check the handling the handling - simulation run in and proper functioning of all components of components of the HIT-RE 500 injection system, system, i.e. foil pack, jumbo cartridge, manual dispenser and pneumatic dispenser. By means of the pressure chamber simulation run, it was proven that the HIT-RE 500 foil pack system and the jumbo cartridge system work properly at depths of at least 50 m. The short-term tests and the long-term creep tests showed that Hilti HIT-RE 500 injection adhesive works well if used for anchor fastenings under water. The HIT-RE 500 underwater underwater system differs f rom the existing Hilti underwater system: HIT-RE 500 does not need an adhesive capsule in addition to the inj ection adhesive. adhesive. The HIT-RE 500 adhesive simply has to be injected into a well cleaned hole and the fastener then inserted, i.e. HAS threaded rod, HIS-N internally threaded sleeve or a rebar. Additional advantages of advantages of HIT-RE 500 for underwater fastenings fastenings are: formula tion with with its low dispensing force at low adhesive - Due to the unique adhesive formulation temperatures and the unique foil pack system, HIT-RE 500 can easily be used at water temperatures as low as 5°C / 40°F. of HIT-RE 500, underwater applications can be carried - Due to the long working / gel time of out very conveniently. of the adhesive is a great advantage advantage from the point of of view of contrast - The red colour of and visibility in the r ather difficult site conditions. environmental aspects, aspects, the HIT-RE HIT-RE 500 injection adhesive is listed listed by NSF for - Regarding environmental potable water applications. applications. Tests in fresh water as as well as in salt water showed showed that HIT-RE 500 injection adhesive cures properly if the adhesive is used according to the conditions recommended in this paper and in the “Instructions for use”, distributed with the product. Fastenings made with HIT-RE 500 were tested f or water impermeability up to 7 bar water pressure. The tests proved that fastenings made in concrete with HIT-RE 500 are as water tight as t he concrete itself. This procedure informs you how threaded rods, internally threaded sleeves and reinforcing bars can be designed for and installed in underwater applications using Hilti HIT-RE 500 injection adhesive.
For internal use only!
Hilti Development Fastening Systems
Hilti HIT-RE 500 for “Underwater Fastenings”
From: Date: Page:
DMPg August 31, 2001 2/5
Cor rosion aspect: Even if anchor fastenings are designed and installed properly, how long a fastening will last, i.e. its life expectancy, depends on the resistance to corrosion of the metal fastener. Careful selection of the right grade of steel for a metal fastener and its protection against corrosion are therefore essential for the fastening life expectancy. In this respect, please refer also to Hilti’s “Corrosion-resistant Fastenings” brochure, edition 2000.
Setting procedure: The quality of a fastening is mainly depending on the bond between the adhesive and the base material. Proper hole cleaning and correct adhesive injection – from the bottom of the hole upwards- is, thus, essential for the right quality of the final fastening. Due to the different setting conditions when fastening underwater compared to normal fastening, the following specific setting procedure should be observed with underwater applications: 1.
Drill the hole. Normally this is done by using a pneumatic hammer drill.
2.
Flush dust and debris out of the hole using water
3.
Clean the hole using a steel brush. The diameter of the steel brush should more or less match the hole diameter (approx. 2 to 5 mm larger) to achieve good cleaning quality. Move up and down the full hole depth 5 times with the steel brush.
4.
Flush the hole with water again until the emerging water is clear.
For internal use only!
Hilti Development Fastening Systems
Hilti HIT-RE 500 for “Underwater Fastenings”
5.
Insert the foil pack into the holder.
6.
Screw the mixer / mixing nozzle onto the foil pack or cartridge.
7.
Insert the foil pack holder assembly into the dispenser and begin to dispense the adhesive.
From: Date: Page:
DMPg August 31, 2001 3/5
M D
2 0 0 0
Insert a jumbo cartridge into the pneumatic dispenser and begin to dispense the adhesive. 8.
Foil packs: Discard the first 3 trigger pulls that emerge from the mixer. This part of adhesive may not be used for fastenings. Jumbo cartridge: Discard a pile of adhesive approx. 50 mm in diameter and 25 mm in height. This part of adhesive may not be used for fastenings.
9.
Inject the adhesive until the hole is completely filled with adhesive. Start filling from the bottom of the hole and slowly withdraw the mixer / dispenser while filling the hole with adhesive. Displace the water in the hole completely with the injected adhesive.
0 0 2 0 D M
M D 2 0 0 0
For deep holes use mixer extensions. 10.
Insert the fastener. Please refer to the "Instruction for use" regarding the working / gel time “twork / tgel”, initial curing time “tcure,ini “ and full curing time “tcure,full “
See "Instruction for use" on pages 2 and 3.
For more information regarding the setting details, cartridge handling, safety aspects and waste handling, please refer to the "HIT-RE 500 instructions for use" which are enclosed with each foil pack or jumbo cartridge.
For internal use only!
Hilti HIT-RE 500 for “Underwater Fastenings”
Hilti Development Fastening Systems
From: Date: Page:
DMPg August 31, 2001 4/5
Anchor fastening design: Water-saturated concrete, which is normal with underwater conditions, has less mechanical strength than dry concrete. The lower mechanical performance of water saturated concrete and the behavior of bonded systems in such base material must be taken into consideration when designing underwater fastenings. The design of underwater fastenings when using HAS, HAS-R and HAS-HCR threaded rods, HIS-N and HIS-RN internally threaded sleeves and rebars can be carried out easily if the design procedure and technical data published in the “Fastening Technology Manual (TM)”, issue 2001, from the Hilti Corporation, Schaan, FL, are observed. As mentioned above, the concrete (base material) is always water saturated when fastening underwater. In view of this, the reduction factor f w,sat = 0.7 has to be taken into account in each case. Please make sure that the minimum concrete grade of at least C20/25 specified by Hilti for underwater fastenings made with HIT-RE 500 is kept to.
We hope this technical information enables HIT-RE 500 users to design and install high-quality fastenings in underwater conditions.
Hilti Anchor BU, Development, Kaufering H. Ginter R. Neuerburg
Enclosure: Photos from an underwater creep test
For internal use only!
Hilti Development Fastening Systems
Photos 1 and 2:
Hilti HIT-RE 500 for “Underwater Fastenings”
From: Date: Page:
DMPg August 31, 2001 5/5
Sustained loading test (creep test) with HAS M12 threaded rods and rebars 12 mm dia. set and tested underwater
For internal use only!
