MAPEGROUT T40 Medium strength (40 MPa), shrinkage compensated, fibre-reinforced, thixotropic mortar for repairing concrete
WHERE TO USE Repair of degraded vertical or horizontal concrete surfaces with mortar possessing medium mechanical performance characteristics. Some application examples • Repair of degraded concrete surfaces, corners of pillars and beams, balconies damaged by rusted reinforcing bars. • Repairs to diaphragms and tunnels. • Concrete linings for canals and hydraulic projects. • Reconstruction of concrete coverings of reinforcing bars. • Repair of surface irregularities including exposed aggregate, joints between new and old concrete, holes in formwork concrete, protruding steel, etc. • Filling of rigid joints.
TECHNICAL CHARACTERISTICS Mapegrout T40 is a premixed powdered mortar composed of cement, graded aggregates and special additives manufactured from a formula developed in the MAPEI Research Laboratories. When mixed with water Mapegrout T40 forms an easy to apply thixotropic mortar that can be applied without slumping even in substantial thicknesses on vertical surfaces without formwork. When fully cured, Mapegrout T40: • has moderate flexural and compressive strength; • has a modulus of elasticity, thermal expansion coefficient and permeability coefficient similar to that of medium quality concrete; • is waterproof; • has excellent adhesion to existing concrete surfaces provided they are saturated with water and reinforcing bars are first treated with Mapefer or Mapefer 1K. If Mapegrout T40 is prepared by only adding water, it must be cured under damp conditions in order to guarantee that the product’s expansive properties develop completely and correctly. However, it is not very easy to guarantee that these conditions are created on site. Therefore, to guarantee that the expansive properties of Mapegrout T40 take place when drying 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 by adding it to the mix. Mapecure SRA has a very important role to play, in guaranteeing better curing of mortar. Also, when mixed with Mapegrout T40, 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. 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. Mapegrout T40 meets the requirements defined by EN 1504-9 (“Products and systems for the protection and repair of concrete structures - Definitions, requirements, quality control and evaluation of conformity - General principles for the use of products and systems”) and the minimum requirements claimed by EN 1504-3 (“Structural and non structural repair”) for structural mortars of class R3. Mapegrout T40 meets the requirements of AS/NZS 4020:2005. (Eurofins| ams Report Reference No.1609354).