Sikacrete®-910 UHPC

Sikacrete®-910 UHPC conforms to:

CSA A23.1:19 Annex U.

Ontario Minisrty of Transport  DSM 9.25.50.

Approved list for PJCCI (Pont-Jacque Cartier and Champlain Bridges Inc.

Sikacrete®-910 UHPC is composed of Mortar (DC-101 CEM), carefully selected admixtures,(ADMX 201, ADMX 202 and/or ADMX 203) and either a micro steel fibre or a Synthetic fibre, along with the site addition of water/ice. Other additves may be reccomended in certain applications only on the specific advice and approval of your Sika representative.

Sika DC-101 CEM (Cementitious pre-blend): Pre-blend bags must be protected from moisture, freezing, and kept dry at all times. Unopened bags of Sika DC-101 CEM have a shelf life of 6 months.

ADMX 201,202 and 203 (Liquid Additives): Keep from freezing, if frozen will require thorough agitation before use. Shelf life when properly stored and not previously frozen, 1 year.

Steel and Synthetic Fibers: When stored in dry conditions, shelf life is 5 years.

Protect against all moisture and freezing conditions.

Tested in accordance with CSA A23.2-9C and Clause U4.1.5 Annex U

With 2.5% Steel Fibre

Flexural/Tensile strength-ASTM C 1609

> 15 Mpa (Peak Strength)

CSA A23.1 U4.1.2.2.5 Strain Hardening Factor 

1.29

Standard test method for length change of hardened hydraulic-cement mortar and concrete (CSA A23.2-21C)

Chloride Ion Permeability ASTM C1202

58 Coulombs

ASTM C666 - Standard Test Method for Resistance of Concrete to Rapid Freezing and Thawing: Procedure A

300 cycles - Durability factor 101%

Tested to CSA A-23.1 U4.1.8.3 Salt Scaling

0.06 Kg/m² 

Please refer to the Sikacrete®-910 UHPC Installation manual for detailed instructions on component dosages, mixing, placement and curing procedures. Fibre and admixture dosages may be adjusted to conform to specific project requirements or specifications.

All surfaces to be in contact with Sikacrete®-910 UHPC must be free of dust, oil, grease, rust or any other foreign substances that may interfere with the bond of the material. For concrete repair applications, remove all delaminated or unsound concrete providing a roughened surface equivalent to minimum CSP 7 and a minimum of 25 mm (1 inch) clearance behind any corroded reinforcing steel. The perimeter of the repair area should be saw-cut a minimum of 20 mm (3/4 inch). Clean the area to be repaired with potable water, leaving the concrete saturated but free of standing water (SSD).

Mixing Sikacrete®-910 UHPC requires a high shear mixer and qualified personnel on-site. The number of mixers should be adjusted to reduce the waiting time between batches, depending on the volume of material to be placed. Since a wheelbarrow or a buggy will be used to transport the fresh material to the pouring location, the mixer(s) must be raised high enough to ensure that it discharges properly. A platform can also be used next to the mixer to allow workers to batch properly and safely. The mixer(s) should be kept as clean as possible between batches in order to guarantee the performance of subsequent batches. Alternative methods of transporting the prepared SikaCrete-910 UHPC can be approved such as a vehicle mounted agitators and pumps. All alternatives should be discussed with your representative prior to commencing.

Prior to placing the Sikacrete®-910 UHPC should remain agitated on low speed in the mixers. Under no circumstances should additional water be added to the mix, this will result in lower performance.

Sikacrete®-910 UHPC has very specific mixing instructions regarding the sequencing, addition rates and mixing times.At application temperatures above  15 ⁰C both ice and pottable water is used for mixing. Contact your local Sika representative to obtain a copy of the Contractor Training Manual for complete instructions on mixing and approved mixers.

Sikacrete®-910 UHPC placement methods will vary depending on intended application. Normal consisitency is as viscous flowable mortar, that can be poured in place under head pressure or pumped. Slump may adjusted up or down by the use of ADMX-201 under guidance of your Sika Representative.

Contact your local Sika Representative to discuss your application and obtain a copy of the Contractor Training Manual and if required pumping guidelines.

Removal of formwork can be done after two days, but the contractor must maintain a continuous wet cure of the material until the Sikacrete®-910 UHPC has achieved a compressive strength of 100 MPa in accordance with clause U.7.3.2 of CSA A23.1-19 Annex U. The temperature of the Sikacrete®-910 UHPC should be maintained between 10 °C and 60 °C throughout the curing period. If the ambient temperature is too low, a heating system must be used to provide the necessary heated environment for the appropriate strength development of the material, the heating system should not be directly emitting carbon dioxide to the curing region. Refer to your local Sika Representative for more information.