SikaTop®-121
SikaTop®-121 is a two-component cement based, polymer modified, trowelable adhesive and filling compound for the protection and repair of concrete surfaces.
- Pre-batched product
- User friendly
- Good mechanical strengths
- Excellent adhesion
- High resistance to chloride salts
Usage
- Thin layer render
- Levelling of surfaces
- Protective coating for bridges parapets, retaining walls, etc.
- Filling compound to level off irregularities and to fill blowholes and fine honeycombing
- Rendering for reservoirs, ponds. etc
Advantages
- Pre-batched product
- User friendly
- Good mechanical strengths
- Excellent adhesion
- High resistance to chloride salts
Packaging
25 kg set (A+B)
Colour
Component A: White liquid
Component B: Grey powder
Product Details
Chemical Base
Cement, selected aggregates and additives
Shelf Life
12 months
Storage Conditions
Store in a dry area in original sealed packaging. Protect from direct sunlight.
Density
Fresh density of mortar ~ 2.0 kg/l at +25 °C
System Structure
Repair Mortar | |
SikaTop®-122 | Concrete Repair Mortar |
Pore sealer and levelling mortar | |
SikaTop®-121 | Normal Use |
Compressive Strength
~ 25–30 MPa after 28 days
Tensile Strength in Flexure
~ 5–7 MPa after 28 days
Tensile Adhesion Strength
> 2 MPa after 28 days
Application
Mixing Ratio
Parts by weight A : B = 1 : 4–5, depending on required consistency
Layer Thickness
Minimum 2 mm/ maximum 5 mm
Ambient Air Temperature
+5 °C minimum; +35 °C maximum
Substrate Temperature
+5 °C minimum; +35 °C maximum
Pot Life
~ 45 minutes at 30 °C
Consumption
This depends on the substrate roughness and thickness of layer applied. As a guide, ~ 20 kg of fresh mortar per cm thick per m2
Yield
25 kg set yields approximately 12.5 litres of mortar
MIXING
SikaTop®-121 can be mixed with a low speed (< 250 rpm) hand drill mixer.
Shake Component A (liquid) and pour it into a suitable mixing vessel. While mixing add Component B (powder) into the mix. Mix the two components together for a minimum 3 minutes.
DO NOT ADD WATER.
APPLICATION
SikaTop®-121 can be applied manually using traditional techniques. Thoroughly pre-wet the prepared substrate a recommended 2 hours before application. Keep the surface wet and do not allow to dry. Before application remove excess water e.g. with a clean sponge. The surface shall appear a dark matt appearance without glistening and surface pores and pits shall not contain water.
Apply first a scratch coat by firmly scrapping the repair mortar over the substrate surface to form a thin layer and fill any pores or pits in the surface. Ensure the whole surface to be repaired is covered by the scratch coat. Build up layers from bottom to top by pressing mortar well into the repair area.
The surface can be finished according to the requirements using a float while wet or with a relevant rough-cast tool as soon as the mortar has started to stiffen.
CURING TREATMENT
Protect the fresh mortar immediately from premature drying using an appropriate curing method e.g. curing compound, moist geotextile membrane, polythene sheet, etc.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened material can only be mechanically removed.