Product Data Sheet Show all documents

SikaFlow®-915 RTA

(former MFlow 915 RTA)

High strength thixotropic epoxy bedding mortar for rubber expansion joints

SikaFlow®-915 RTA is a high performance, epoxy resin based bedding mortar for use with moulded rubber segmental expansion joints. Suitable for use in hot and tropical climatic conditions.

SikaFlow®-915 RTA provides excellent resistance to creep and high early and ultimate compressive strengths. SikaFlow®-915 RTA is resistant to oil, synthetic lubricants, water and most chemicals. 
  • No priming required
  • High tensile, flexural and compressive strength
  • Excellent adhesion to steel and concrete
  • Excellent fatigue resistance
  • High resistance to dynamic loads and chemical attack 
Product Data Sheet Show all documents

Usage

As a bedding mortar for segmental expansion joints where a low flow, high strength material is required to accommodate high road cambers.  

Advantages

SikaFlow®-915 RTA provides excellent resistance to creep and high early and ultimate compressive strengths. SikaFlow®-915 RTA is resistant to oil, synthetic lubricants, water and most chemicals. 
  • No priming required
  • High tensile, flexural and compressive strength
  • Excellent adhesion to steel and concrete
  • Excellent fatigue resistance
  • High resistance to dynamic loads and chemical attack 

Packaging

Supplied in 13.5 L units comprising of:

Base

2.78 kg

Reactor

0.93 kg

Aggregate

25 kg

Total Pack Weight28.71 kg

Product Details

Product Information

Composition

Epoxy resin and selected aggregate

Shelf life

12 months from production date

Storage conditions

Stored properly in air-conditioned enviroment in original, unopened, sealed and undamaged packaging in dry conditions at temperatures
between +5 °C and +30 °C. Protect from direct sunlight, heat and moisture.

Density

~2.1 kg/l (mixed, at 25°C)

(ASTM C905-79)

 
Technical Information

Resistance to impact

Superior to concrete

Compressive strength

Strength:

Curing:

≥ 20 N/mm2

12 hours at +25°C

≥ 50 N/mm2

24 hours at +25°C

≥ 65 N/mm212 hours at +40°C
≥ 80 N/mm224 hours at +40°C
≥ 90 N/mm214 days at +25°C

*Modified 50 mm cubes

Tensile strength

~14 N/mm2

(ASTM C307-83)

Chemical resistance

SikaFlow®-915 RTA resists non-oxidising mineral acids and salts, caustics, dilute oxidising acids and salts, plus some organic acids and solvents. For more specific information contact your Sika Technical Department. 

Application

Application Information

Layer thickness

Min. 30 mm

Max. 300 mm

Note: For above 100 mm thickness application, please contact Sika Technical Department for application recommendation.

Curing time

Cure time of the grout will depend upon the ambient and concrete surface temperature. Unless the ambient air temperature has been constant for several days the concrete temperature will generally be lower than air temperature. 

Application time

~55 min at 25°C
~30 min at 40°C

The following chart is a guide for the working time of the fresh epoxy bedding mortar mix at various ambient temperatures. The working time of a SikaFlow®-915 RTA mix begins when the hardener is added to the liquid.
Application steps

SURFACE PREPARATION

Quality of surface preparation has a direct effect on the performance and durability of the system.

Concrete surfaces should be sound, dimensionally stable, clean, free from laitance, paint, oil, grease, mould release agent and residual curing compound. Concrete should be clean and dry when SikaFlow®-915 RTA mortar is placed. 

The surface roughness should be prepared to minimum CSP 10 acording to ICRI.

New concrete should have a compressive strength of minimum 25 MPa; greater strength is preferred.

No primer application needed. 

 

MIXING

Do not split packs or alter the ratio of resin components.

Mix with a heavy-duty slow speed hand mixer. Add the contents of the reactor container to the base component in a suitable clean mixing vessel, ensuring complete transfer of both resin components.

Mix for one minute before slowly adding the aggregate and continue mixing until a soft-mortar consistency is achieved. Do not overmix. Avoid aeration while mixing until the material becomes uniformly blended in colour and viscosity. 

CLEANING OF EQUIPMENT

Clean tools and mixers with suitable thinner (Xylene / Acetone / MEK). Hardened / cured material can only be mechanically removed.

Documents