Polyester Resin Grout. 

epidemix 725, 725TX and 750 are two-component polyester resin grouts for a variety of anchoring applications.

These polyester resin grouts are formulated to provide high-strength chemical-resistant grouting and anchoring of bars, bolts and other embedded objects into concrete, high strength masonry, brick and rock. They are also used when early loading is required such as in starter bars, holding down bolts, anchors, fence and general fixing of steel.

  • epidermix 725 – pourable
  • Vertical anchoring where the hole diameter is less than 25mm greater than the bar diameter.
  • epidermix 725TX – paste
  • A thixotropic paste used for horizontal vertical and overhead anchoring where the hole diameter is less than 25mm greater than the bar diameter.
  • epidermix 750 – pourable
  • Vertical anchoring when the hole diameter is between 25mm and 50mm greater than the bar diameter.

The strength of the bond and ultimately the anchor depends on a number of factors:

  • Bar size and surface profile
  • Key profile in the concrete and the shape of the hole
  • Bond surface area
  • Substrate material strength

These resin anchors should not be used when structural integrity of the anchor is expected to be maintained during a fire or excessive heat conditions.

Advantages
  • Can be placed in a damp hole.
  • Rapid curing and strength gain.
  • May be used where vibration on bolts is a problem.
  • Corrosion resistant.
  • Can be applied underwater.
  • Easy to apply with pourable consistency.
  • The pour grades are very easy to apply.
  • These grouts will adhere to damp surfaces.
Properties
Test method Result epidermix 725, 725TX & 750
Compressive strength ASTM C109 30, 25 & 30 Mpa at 1 hour
Compressive strength ASTM C109 65, 60 & 65 Mpa at 2 hours
Compressive strength ASTM C109 90, 83 & 90 Mpa at 24 hours
Gel time at various temps (mins) 90 for all at 10°C
Gel time at various temps (mins) 35 for all at 25°C
Gel time at various temps (mins) 13 for all at 35°C
Anchorage strength (tonnes). Tested using a reinforcing bar anchored into a 32 mm steel pipe.
A
16 mm dia re-bar x 0,5 m grout depth
B
25 mm dia re-bar x 0,25 m grout depth
A – @ 45 mins B – @ 45 mins
A – 10 @ 1 hour B – 7 @ 1 hour
A – 14* @ 2 hours B – 15 @ 2 hours
* Note: Re-bar failure
Hole Preparation

For effective bond between the resin and the substrate ensure that the hole provides sufficient key or that smooth holes have been undermined. The optimum depth of the hole can be determined from Fig.1 for holes in concrete. Ensure that the hole is free from laitance, oils and grease and that any previous coatings have been removed.

Minimum factors of safety of 2 should be used in critical areas and 1,5 in non-critical areas.

Anchor Bar Preparation

Anchor bars must be either threaded or ribbed high tensile steel. They are to be degreased with suitable chemicals and all rust and other loose particles. A metallic finish is to be achieved by grit blasting to SA 2 ½.

Fig 1: Bond length – practical load/bond lengths for 25 mm bars in 20 Mpa concrete.

Coverage
Coverage The volume of grout in liters per 100 mm of hole depth
Hole diameter (mm) Bolt diameter (mm)
12 16 20 25 32 38 44,5 51
20 0,020              
25 0,038 0,029 0,018          
32 0,069 0,060 0,049 0,031        
38   0,093 0,082 0,064 0,033      
45     0,128 0,110 0,079 0,046    
51       0,155 0,124 0,091 0,049  
57       0,206 0,175 0,142 0,100 0,510
64       0,273 0,241 0,208 0,166 0,117
76           0,340 0,298 0,249
Note:  Allowance for wastage should be made when estimating
Mixing

To provide the correct consistency and strength the contents of the epidermix kit has been pre-measured and should under no circumstances be part mixed. The entire contents of the powder component should be emptied into the mixing vessel followed by the resin component. Ideally a suitable paddle on a slow-speed drill should be used to blend the two components until an even consistency is achieved. Small quantities can also be mixed by hand. The mixed material should then be folded over to reveal any unmixed powder and mixing re-commencing for a further 2 minutes to ensure a totally homogenous mix. Be sure to scrape the sides and bottom of the mixing container.

Application

epidermix 725 and 750 should be carefully poured into the holes prepared as already described. The volume required can be calculated from the tables on the previous page. The bolt or bar is then placed into the hole, turning it to agitate the material as it is inserted to release any trapped air and to thoroughly wet the steel, aiding adhesion. The bar should be propped into position in the centre of the hole and left unmoved until the resin has set. epidermix 725TX should be placed in the back of the hole using a suitable cartridge with a fluid hose attached. The bolt to be introduced in the same manner as in the epidermix 725 and 750 applications.

Cleaning

Tools may be cleaned with abe® super brush cleaner immediately after use before the material has had time to cure.

Model Specifications

epidermix 725

Pourable polyester resin grout for vertical down anchoring of bolts and bars into concrete, rock and masonry where early loading is needed. Up to 25 mm.

The grout will be epidermix 725, a two-component, polyester resin grout applied in accordance with the recommendations of a.b.e.® Construction Chemicals. The cured grout will achieve a compressive strength of 90 MPA in 24 hours.

epidermix 725TX

Thixotropic polyester resin grout for overhead and horizontal anchoring of bolts and bars into concrete, rock and masonry where early loading is needed.

The grout will be epidermix 725TX, a two-component, thixotropic, polyester resin grout applied in accordance with the recommendations of a.b.e.® Construction Chemicals. The cured grout will achieve a compressive strength of 83 Mpa in 24 hours.

epidermix 750  

Pourable polyester resin grout for vertical down anchoring of bolts and bars into concrete, rock and masonry where early loading is needed. From 20 – 50 mm.

The grout will be epidermix 750, a two-component, polyester resin grout applied in accordance with the recommendations of a.b.e.® Construction Chemicals. The cured grout will achieve a compressive strength of 90 Mpa in 24 hours.

Temperature

As with all resins, the mixture may not be applied to substrates at a temperature lower than 5°C. At ambient temperatures above 35°C, working time and pot life will be drastically shortened.

Packaging

These grouts are supplied as:

Epidermix 725 – 2,5 liter and 5 liter kits.

Epidermix 750 – 5 liter kits.

Epidermix 725TX – 2,5 liter kits.

Handling & Storage

These products have a shelf life of 12 months at 20°C. This will reduce at higher temperatures. The product should be kept in a dry store in its original sealed container.

Health & Safety

Wet epidermix could be toxic and flammable. Always ventilate the working area well during application and drying. epidermix 725, 750 and 725TX are flammable therefore naked flames, including smoking by the applicators, must be avoided.

Always use protective equipment such as clothing, gloves and eye protection when working with the material. Avoid excessive inhalation and skin contact.

In case of contact with the skin remove with resin removing cream and soap and water. Do not use solvents. If material is splashed in the eye, wash with copious quantities of clean water and seek immediate medical attention.

Flash point is 29°C

Cured epidermix is inert and harmless.

Important Notice

This data sheet is issued as a guide to the use of the product(s) concerned. Whilst a.b.e.® Construction Chemicals endeavors to ensure that any advice, recommendation, specification or information is accurate and correct, the company cannot – because a.b.e.® has no direct or continuous control over where and how a.b.e.® products are applied – accept any liability either directly or indirectly arising from the use of a.b.e.® products, whether or not in accordance with any advice, specification, recommendation, or information given by the company.

Further Information

Where other products are to be used in conjunction with this material, the relevant technical data sheets should be consulted to determine total requirements. a.b.e.® Construction Chemicals has a wealth of technical and practical experience built up over years in the company’s pursuit of excellence in building and construction technology.