Sika MonoTop®-438 R
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
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
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.
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
Dmax: 5 mm maximum
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
Compressive Strength
| +5°C | +20°C | +30°C | |
| 4 hours | - | ~ 10 N/mm² | ~ 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
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.
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.
CLEANING OF TOOLS
Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.
