PC-Conrend® MC 2, Construction Chemicals

PC-Conrend® MC 2

Dual shrinkage compensated, flowable micro concrete for concrete repairs

PACKAGING

PC-Conrend®MC 2 is available in 25kg bags.

PC-Conrend®MC2 micro concrete pourable mortar is a superior quality, high-strength formulation designed for structural concrete repairs, as well as general-purpose repairs. It is highly flowable and can be applied in thicknesses ranging from 25mm to 200mm.PC-Conrend®MC 2 is an excellent choice for achieving a robust, long-lasting structural repair that blends seamlessly with the host concrete.

FEATURES

When considering repair needs, it’s worth exploring factory-made pourable mortar, which offers several advantages:

No vibration required
Pumpable with ease
Easy to mix and apply
Exhibits exceptional flow characteristics
Rapid strength development
High ultimate strength
Resistant to impact
Non-corrosive
Non-toxic
Dual-stage expansion creates dense and nonshrink concrete
Iron and chloride-free
Provides good bonding with existing concrete
Consistency can be controlled by regulating water within the recommended limit.

USES

PC-Conrend®MC 2 is a superior material for both horizontal and verticalstructural repairs where the thickness of the repair is more than 25mm and the usage of pourable mortar is preferred over hand or machine applied repair systems. This material is commonly used for the following applications:

Comprehensive repairs of structural elements such as beams and columns
Repair of structural members that are subjected to repetitive loading
Jacketing of beams, columns, and other structural elements to enhance their strength.

SURFACE PREPARATION

When repairing concrete, it’s crucial to ensure that any loose concrete or mortar, dust, grease, oil, or other contaminants are entirely removed. For optimal bonding, it’s recommended that damaged or contaminated concrete be extracted to reveal an aggregate-exposed surface. Nonimpact or vibrating cleaning methods, such as grit or high-pressure water blasting, are the most effective. To create a vertical edge, cut the repair’s edges to a minimum depth of 20 mm. It’s essential to clean all exposed reinforcement to a minimum level of Sa 2, following ISO 8501-1 / ISO 2944-4 standards, and clear the reinforcing bar’s back. In the case of corroded reinforcing bars, remove the concrete at least 20mm behind the bars and apply PC-Conrend®ZRP to both old and new surfaces for corrosion protection. Use grit blasting to remove corrosion products around the reinforcing bars. If grit blasting results in a reduction of the original diameter of the reinforcing bar by more than 20%, seek guidance from the project’s structural engineer. Replace the affected portion of the reinforcing bar as necessary.

MIXING

To achieve the best results when mixing PCConrend®MC 2, it’s important to use only full bags and a forced action pan mixer or a low-speed mixer with a helical paddle. Mix for three minutes until the texture is consistent, lump-free, and flowable. Use
only clean water at a recommended ratio of 3.25 to 3.75 liters per 25kg bag. Let the mortar stabilize for 2-3 minutes before mixing briefly and pouring into formwork. If the temperature exceeds 40°C, use chilled water.

MORTAR PLACING

To ensure optimal curing, maintain minimum temperatures during application and for 24 hours after. Pre-soak the prepared substrate, remove water from the formwork before installation, and pour or pump PC-Conrend®MC 2 until the void is filled.
Avoid vibration to prevent segregation. Remove formwork after 1-3 days and apply a curing compound. For subsequent coats, use clear Polythene for three days. For repairs exceeding 80- 100mm, extend with up to 25kg of high-density aggregates. Consult a local PC-WC representative for further advice. It is recommended to apply subsequent coatings of anti-carbonation
barriers or silane impregnations in accordance with the corresponding
data sheets.