Mapegrout Thixotropic

Controlled-shrinkage fibre-reinforced grout for the repair of concrete.

Use Mapegrout Thixotropic for all concrete repairs such as: reconstruction of concrete cover, repairs of corners, beams, columns and balconies damaged by rusted reinforcing rods.

Where to use:

Surface repair of deteriorated concrete structures on both vertical and horizontal surfaces.

Application examples:

• Repairing deteriorated areas of concrete, corners of pillars and beams, edges of balconies damaged by the oxidation of reinforcing steel.

• Reconstruction of reinforcing rod covers in reinforced concrete structures.

• Smoothing surface defects, such as gravel nests, new casting joints, holes created by formwork spacers, exposed rods, etc.

• Filling of rigid joints.

• Repair of surfaces subjected to heavy abrasion (canals, industrial floors, ramps, etc.). Smoothing of diaphragm walls and tunnels.

• Repairing viaducts for highways, roads and railways.

Technical information:

Mapegrout Thixotropic is a ready-mixed powdered mortar composed of high-strength cements, selected aggregates, special additives and synthetic fibres prepared according to a formula developed in the MAPEI Research & Development laboratories. When mixed with water, Mapegrout Thixotropic becomes an easily workable mortar with high thixotropic properties that can be applied on vertical surfaces without sagging even in great thicknesses and with no need for formwork. If Mapegrout Thixotropic is prepared by only adding water, it must be cured under damp conditions in order to guarantee that the product expansive properties develop completely and correctly. Unfortunately, it is not easy to guarantee that these conditions are created on site. However, to guarantee that the expansive properties of Mapegrout Thixotropic are carried out in the open air, 0.25% of Mapecure SRA, a special additive which has the property of reducing both plastic and hydraulic shrinkage, may be used to great advantage when added to the mix. Mapecure SRA has a very important role to play, in guaranteeing better curing of mortar. Also, when mixed with Mapegrout Thixotropic, it may be considered a technologically advanced system, in that the additive has the capacity of slowing down evaporation of the water and of promoting the development of hydration reactions. Basically, Mapecure SRA behaves like an internal curing agent and, thanks to its interaction with some of the main components which make up the cement, it helps to reduce shrinkage by between 20% and 50% compared with the standard values of the product without the additive. This will obviously lead to a reduced risk of cracking. Once hardened, Mapegrout Thixotropic has the following properties: · very high flexural and compressive strength; · modulus of elasticity, coefficient of thermal expansion and permeability to water vapour similar to those of high quality concrete; · waterproof; · high adhesion to old concrete, provided it has been soaked with water beforehand, and also to reinforcing rods, especially if they have been treated with Mapefer or Mapefer 1K; · high resistance to abrasion.