Product Data Sheet
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Sikadur®-31 Hi-Mod Gel

Sikadur®-31 Hi-Mod Gel

High-modulus, high-strength, structural, epoxy paste adhesive

Sikadur®-31 Hi-Mod Gel, is a 2-component, 100 % solids, solvent-free, moisture-tolerant, high-modulus, high strength, structural epoxy paste adhesive. It conforms to the current ASTM C-881, Types I and IV, Grade-3, Class-B/C and AASHTO M-235 specifications.

  • Meets physical requirements of ASTM C-881 Types I, II & IV, Grade 3, Classes B & C.
  • Suitable for potable water contact, meets NSF/ANSI Standard 61.
  • Excellent adhesion to concrete, masonry, metals, wood, and most structural materials.
  • Paste consistency ideal for vertical and overhead repair of concrete.
  • Fast-setting and strength-producing adhesive.
  • Convenient easy mix ratio A:B = 1:1 by volume.
Product Data Sheet
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Usage

  • Structural bonding of concrete, masonry, metals, wood, etc. to a maximum glue line of 1⁄8 in. (3 mm).
  • Grout bolts, dowels, and pins.
  • Seals cracks and around injection ports prior to pressure-injection grouting.
  • Interior, vertical, and overhead repair of concrete as an epoxy mortar binder.
  • As a pick-proof sealant around windows, doors, lock-ups etc. inside correctional facilities.
 

Advantages

  • Meets physical requirements of ASTM C-881 Types I, II & IV, Grade 3, Classes B & C.
  • Suitable for potable water contact, meets NSF/ANSI Standard 61.
  • Excellent adhesion to concrete, masonry, metals, wood, and most structural materials.
  • Paste consistency ideal for vertical and overhead repair of concrete.
  • Fast-setting and strength-producing adhesive.
  • Convenient easy mix ratio A:B = 1:1 by volume.

Packaging

1 gal. and 3 gal. (11.4 L) units.

Color

Concrete gray

Product Details

Product Information

Shelf Life

24 months in original, unopened containers

Storage Conditions

Store dry at 40–95 °F (4–35 °C).

Condition material to 65–85 °F (18–29 °C) before using.

Consistency

Non-sag paste
Technical Information

Compressive Strength

40 °F

(4 °C)* **

73 °F

(23 °C)* **

90 °F

(32 °C)* **

2 hours--

450 psi

(3.1 MPa)

4 hours-

800 psi

(5.5 MPa)

10,500 psi

(72.4 MPa)

8 hours-

8,500 psi

(58.6 MPa)

11,000 psi

(75.8 MPa)

16 hours-

10,000 psi

(68.9 MPa)

11,500 psi

(79.3 MPa)

1 day

2,000 psi

(13.8 MPa)

11,000 psi

(75.8 MPa)

11,800 psi

(81.4 MPa)

3 days

6,000psi

(41.4 MPa)

12,000 psi

(82.7 MPa)

12,000 psi

(82.7 MPa)

7 days

10,000 psi

(68.9 MPa)

12,300 psi

(84.8 MPa)

12,400 psi

(85.5 MPa)

14 days

11,000 psi

(75.8 MPa)

12,500 psi

(86.2 MPa)

13,000 psi

(89.6 MPa)

28 days

12,000 psi

(82.7 MPa)

13,000 psi

(89.6 MPa)

13,000 psi

(89.6 MPa)

* Material cured and tested at temperatures indicated.
** See Limitations section for further information.

Modulus of Elasticity in Compression

5.6 X 105 psi (53,861 MPa) (7 days)

(ASTM D-695)

73 °F (23 °C)
50 % R.H.

Flexural Strength

6,100 psi (42.0 MPa) (7 days)

(ASTM D-790)

73 °F (23 °C)
50 % R.H.

Modulus of Elasticity in Flexure

1.5 X 106 psi (10,342 MPa) (7 days)

(ASTM D-790)

73 °F (23 °C)
50 % R.H.

Tensile Strength

3,300 psi (22.7 MPa) (7 days)

(ASTM D-638)

73 °F (23 °C)
50 % R.H.

Tensile Adhesion Strength

Hardened Concrete to Hardened Concrete:

2 days (dry cure)4,000 psi (27.5 MPa)
2 days (moist cure)3,800 psi (26.2 MPa)
14 days (moist cure)3,800 psi (26.2 MPa)

    

Hardened Concrete to Steel:

2 days (dry cure)2,900 psi (20.0 MPa)

   

Tensile Bond Strength (Pull-off Method, Dyna):

2 days

420 psi (2.9 MPa

Shear Strength

4,600 psi (31.7 MPa) (7 days)

(ASTM D-732)

73 °F (23 °C)
50 % R.H.

Heat deflection temperature

(Fiber Stress Loading = 264 psi)135 °F (57 °C) (7 days)

(ASTM D-648)

Water Absorption

0.07 % (24 hours)

(ASTM D-570)

Application

Application Information

Mixing Ratio

Component ‘A’ : Component ‘B’ = 1:1 by volume

Pot Life

Approximately 60 minutes at 73 °F (500 gram mass)

Cure Time

Tack-Free Time: 1.5–2.5 hours at 30 mils. thick
Consumption

Coverage

1 gal. yields 231 cu. in. (3,785 cm3) of epoxy paste adhesive. 1 gal. (3.8 L) mixed with 1 gal. (3.8 L) by loose volume of oven-dried aggregate yields approximately 346 cu. in. (5,670 cm3) of epoxy mortar.
Application steps

SUBSTRATE PREPARATION

Surface must be clean and sound. It may be dry or damp, but free of standing water. Remove dust, laitance, grease, curing compounds, impregnations, waxes, and any other contaminants.

Preparation Work: Concrete - Should be cleaned and prepared to achieve a laitance and contaminant free, open textured surface by blast cleaning or equivalent mechanical means.

Steel - Should be cleaned and prepared thoroughly by blast cleaning or other equivalent mechanical means.

MIXING

Pre-mix each component. Proportion 1 part Component ‘B’ to 1 part Component ‘A’ by volume into a clean pail or appropriately sized mixing container. Mix thoroughly for 3 minutes with Sika paddle on low-speed (400–600 rpm) drill until uniform in color. Mix only that quantity which can be used within its pot life. Prior to mixing, material should be conditioned to 65–85 °F (18–29 °C). To prepare an epoxy mortar, slowly add up to 1 part, by loose volume of an oven dried aggregate, to 1 part of the mixed Sikadur®-31 Hi-Mod Gel, and mix until uniform in consistency.

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