High strength free flowing micro concrete
Polycrete MC is a high strength, shrinkage compensated, free flowing micro-concrete. The material is a blend of portland cement, graded aggregates, special fillers and additives. when mixed with clean water, a free flowing product is produced ideally suited to repair large volume of concrete repairs at thicknesses from 10mm to 250mm.
Properties
- Rapid strength development and high ultimate strength
- Shrinkage compensated
- Minimal drying shrinkage
- Low alkali content minimizes the danger of alkali silica reaction
- Self-compacting /no honeycombing as air is displaced without need for vibration
Recommended use
Polycrete FC is a single component polymer modified fairing coat designed to fill pores, blowholes, minor honeycombs on a concrete surface which can be used for the following fields:
- pile head re-profiling and general void filling
- large volume or area repairs where the use of hand or trowel applied mortars is impractical
- it can be applied for large volume repairs in excess of 10 mm. the product can be applied in sections generally up to 250 mm
- in repair areas with restricted access or high concentration of reinforcement
- due to the plastic nature of the product, it can be used as grout and poured under a head of pressure
Step by Step
Surface Preparation
Concrete substrate to be repaired should be sound, clean, and uncontaminated. The formwork should be rigid and tight to prevent loss of grout and have properly sealed faces to ensure that no water is absorbed from the repair material. Saw cut the extremities of the repair locations to a depth of at least 10 mm to avoid feather edging and to provide a square edge. Clean any corroded rebar by grit blasting or vigorous wire brushing. Any rebar that has lost more than 25% of its original diameter should be cut out and replaced. Prime reinforcement with Polyzinc*, zinc rich primer.
Priming
Not required, pre-wet substrate and remove any contaminats and standing water before placing the grout.
Mixing
One bag (25kg) of Polycrete MC requires 2.75 - 3.25L of clean potable water. In hot climates, the use of cold water (< 25°C) is recommended. Mix in a suitable size drum using an approved grout paddle at a slow speed (300/400 rpm) with a heavy-duty drill. Pour required amount of water in the mixing vessel followed by Polycrete MC. Mix for 3 minutes to get a homogeneous and consistent mix.
Application
The mixed material should be placed within 30 minutes. It can be poured or pumped in to the repair area to fill the cavity at the required level. No vibration is required. After concrete has initially set, the surface may be finished to the desired texture.
Curing
Due to the presence of rapid drying polymers, the repaired area shall be cured in accordance with good concrete curing practice. curing shall be done by non degradable type of curing compound or wet hessian cloth. When cured with wet hessian cloth, the area shall be covered immediately with a high density poly ethylene sheet which shall be taped to all edges.
Yield
12.17L/25 kg @ 0.12 w/p ratio
Mixing Proportion
Polycrete MC shall be mixed with 2.75 - 3.25L water at a w/p ratio of 0.12
Colour and Quantity
Grey in 25kg bag
Disclaimer
The information in this document is given to the best of Polybit's knowledge, based on laboratory testing and practical experience. Polybit's products are considered as semi-finished goods and as such, products are often used under conditions beyond Polybit's control. Polybit cannot guarantee anything but the quality of the product itself.
