Product Data Sheet Safety Data Sheet Show all documents

Sika MonoTop®-438 R

Pourable / castable repair mortar

Sika MonoTop®-438 R is a one component, pre-bagged, pourable, self-compacting fast hardening repair mortar meeting the requirements of class R4
of EN 1504-3.

Class R4 of EN 1504-3
Self compacting micro-concrete
Very good flow properties
Application up to 500 mm thickness (see notes on ‘Layer Thickness’)
Rapid strength development
Early removal of formwork (within ~4 hours at +20°C)
Good adhesion
Low shrinkage
Finished surface can be painted after formwork is removed

Product Data Sheet Safety Data Sheet Show all documents

Usage

Suitable for restoration work by recasting (Principle 3, method 3.2 of EN 1504-9). Repair of spalling and damaged concrete in buildings, bridges, infrastructure and superstructure works.
Suitable for structural strengthening (principle 4, method 4.4 of EN 1504-9). Increasing the bearing capacity of the concrete structure by adding mortar
Suitable for preserving or restoring passivity (principle 7, method 7.1 and 7.2 of EN 1504-9). Increasing cover with additional mortar and replacing contaminated or carbonated concrete.
Rapid repair of concrete on buildings and civil engineering structures for areas including beams, balconies, columns, stairs, decks, walls, etc.

Advantages

Class R4 of EN 1504-3
Self compacting micro-concrete
Very good flow properties
Application up to 500 mm thickness (see notes on ‘Layer Thickness’)
Rapid strength development
Early removal of formwork (within ~4 hours at +20°C)
Good adhesion
Low shrinkage
Finished surface can be painted after formwork is removed

Packaging

25 kg bag

Colour

Grey powder

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

Identification and performance testing for concrete repair material according to AFNOR standard P 18-840. Reports of CEBTP, France 03/B114-6-494 and -499.

Product Information

Chemical Base

Cement blend, selected aggregate and additives.

Shelf Life

Six (6) months from date of production when stored as stated.

Storage Conditions

Store in undamaged and unopened, original sealed containers, in dry conditions at temperatures between +5°C and +30°C.

Density

Fresh mortar density: ~ 2.3 kg/l (wet)

Maximum Grain Size

D_max: 5 mm maximum

System information

System Structure

Sika MonoTop®-438 R is part of the Sika® MonoTop® repair range and system complying with the relevant parts of European Standard EN 1504 and comprising of:
Bonding primer and reinforcement corrosion protection:

Sika® MonoTop®-910 N: Normal use

Repair mortars:

Sika® MonoTop®-352 N: R3 light weight repair mortar
Sika® MonoTop®-723 N: R3 Pore sealer and levelling mortar
Sika MonoTop®-438 R: Pourable/castable repair mortar

Technical Information

Compressive Strength

	+5°C	+20°C	+30°C
4 hours	-	~ 10 N/mm^²	~ 20 N/mm²
1 day	~ 20 N/mm²	~ 25 N/mm²	~ 35 N/mm²
7 days	~ 35 N/mm²	~ 50 N/mm²	~ 50 N/mm²

~ 60 N/mm² after 28 days at 20°C

Flexural Strength

	+5°C	+20°C	+30°C
4 hours	-	~ 4 N/mm²	~ 4 N/mm²
1 day	~ 4 N/mm²	~ 5 N/mm²	~ 5 N/mm²
7 days	~ 5 N/mm²	~ 6 N/mm²	~ 6 N/mm²

~ 7 N/mm² after 28 days at 20°C

Shrinkage

~700 µm/m at 28 days (+20°C / 60% r.h.) (EN 12617-4)

Application

Application Information

Mixing Ratio

~ 3.25 litres of water for 25 kg powder

Layer Thickness

Minimum 15 mm, maximum 350 mm (500 mm when bulked out with 10 kg Sika Pea Metal per 25 kg bag of Sika MonoTop®-438 R)

Ambient Air Temperature

+5°C min. / +30°C max.

Substrate Temperature

+5°C min. / +30°C max.

Pot Life

+5°C	+20°C	+30°C
> 60 minutes	60 minutes	30 minutes

Only prepare the quantity of material that can be used within the stated pot-life!

Consumption

This depends on the substrate roughness and thickness of layer applied. As a guide, ~ 20kg of powder per cm thick per m²

1 bag yields approximately 12.3 litres of mortar.

Application steps

MIXING

Mix with a low speed (< 500rpm) hand drill mixer with helical paddle or using a forced pan action mixer. Pour potable water in the correct proportion into a suitable mixing container. While stirring, slowly add the powder to the water. Mix thoroughly at least for 3 minutes to achieve a uniform lump free consistency.

APPLICATION

Immediately after mixing pour into formwork ensuring continuous flow during the complete casting operation to avoid trapping air or creating ‘cold joints’.

Formwork Removal: As a guide, the formwork can be removed at the following times:

+5°C	+20°C	+30°C
~ 24 hours	~ 4 hours	~ 2 hours

Note: variable weather conditions may affect removal times.

CURING TREATMENT

Protect the fresh mortar from early dehydration using the relevant curing method. Cure for a minimum of 7 days to minimise cracking. Use a 90% efficient curing membrane or polythene sheeting taped down at the edges.