SikaTop®-121

Fiber reinforced polymer modified repair mortar

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
Product Data Sheet Show all documents

Overview

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®-121Normal 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.

 

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