Quickrep S45 Shrinkage compensated, polymer fibre reinforced, thixotropic repair mortar
Quickrep S45, is a cementitious pre-bagged ready-to- use structural repair mortar in powder form. When mixed with the correct amount of water, it produces a thixotropic, high strength repair mortar, reinforced with acrylic polymer fibres. It possess excellent bond characteristics to steel reinforcement and to concrete. Quickrep S45 mortar is shrinkage compensated.
- Repairs in marine environments
- Repairs in industrial areas, especially those containing mineral oils, lubricants
- Protection of concrete subject to attack from water containing chlorides and sulphates etc
- Repairs to reinforced or pre-stressed beams or columns
- Repair of structural members subjected to repetitive loading
- All types of structural repair which can be applied by trowel or wet spray
Features and benefits :
- Extremely low permeability - gives excellent resistance to attack by aggressive elements
- Low rebound - when spray applied rebound is minimal, with subsequent saving in material cost
- Can be spray applied - rapid application of large quantities
- No primer required - allows rapid application at reduced cost
- Shrinkage compensation - reduces the risk of cracking due to shrinkage and ensures full contact with host concrete and load transfer in structural repair situations
How to use :
Preparation of substrate:
It is essential that the substrate to be repaired is sound, clean and free of all contamination. The damaged areas of concrete to be removed should be clearly identified. The perimeter of the area should be saw cut to a depth of 10 mm and the edges cut as neatly as possible keeping the sides square. Feather-edging is not permitted and a minimum thickness of 10 mm must be maintained over the whole repair area. The substrate should be prepared to provide a rough surface having at least a 5 mm amplitude at 20 mm frequency. If unsound or contaminated concrete is found to extend beyond the premarked area, consult the engineer in charge. Subject to his approval cut out as necessary back to clean sound concrete. If reinforcement is corroded ensure that the back of the steel has been exposed. Reinforcement should have all rust removed by the use of power tools, abrasive blasting (wet or dry) or wire brushing. Reinforcing steel should be exposed and cleaned around its whole circumference. Steel should be prepared to Swedish Standard SIS 05-900:1967-SA 2½ or BS 4232 Ref. 24 second quality. Severely corroded reinforcement may require replacement and the engineer must be consulted.
Thoroughly saturate the surface of the concrete to provide a saturated surface dry condition. Poor quality concrete may require soaking for a significant length of time. Any surface water should be removed using an oil free compressed airjet.
Quiclrep S45 must be mixed mechanically. The following mixing equipment is suitable, heavy duty slow speed drill with spiral mixing paddle, forced action mixer, such as Creteangle, Mixal, and Pan Mixers.
Add 3.5 litres of water into the mixer. Start the mixer and add the Quickrep S45 powder rapidly and continuously. Mix for 3 minutes after all the powder has been added until mortar is homogeneous and lump free. Add water, if necessary, within the limits given, until the required consistency is achieved. Mix for a further 1-2 minutes. The amount of water required will be affected by ambient temperature and relative humidity. Quickrep S45 can be used when the ambient temperature is between 5 and 50°C. If ambient temperature is >30°C, use chilled water and condition the bagged product in an air-conditioned store prior to use. Maximum mixed temperature should be no more than 35°C.
After mixing, Quickrep S45 can be sprayed or trowel applied. When applying by hand Quickrep S45 must be forced tightly into the substrate to ensure intimate contact with the pre-wetted substrate. Levelling and initial finishing should be carried using a wooden or plastic float. Final finishing should be carried out using a steel float. When the material has stiffened to the point where finger pressure lightly marks the surface, a final firm trowelling should be given using the steel float.
Good curing is essential. Particular care is required in hot and/or windy conditions.
One 25kg bag of Quickrep S45 with 4 litres of added water will yield approximately 12.6 litres of mortar which will cover 1m² at 12.6 mm average thickness.