Mapegrout Hi Flow

Shrinkage-compensated, fibre-reinforced mortar for concrete repair.

Available in a 25kg unit.

Technical Description

Mapegrout Hi-Flow is a ready-mixed mortar in powder form composed of highly resistant cements, selected aggregates, special admixtures and synthetic fibres prepared according to a formula developed in the MAPEI Research & Development Laboratories.

Mapegrout Hi-Flow when mixed with water, becomes a highly fluid mortar, suitable for pouring into formwork without separation of the aggregates even when forming great thicknesses.

If Mapegrout Hi-Flow 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 easy to ensure these conditions on site.

To guarantee the expansive properties of Mapegrout Hi-Flow in the open air, 0.25% of Mapecure SRA, a special admixture 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 mortar curing. When Mapecure SRA is mixed with Mapegrout Hi-Flow, it is considered a technologically advanced system, as the admixture has the capacity of slowing
down the evaporation of the water from the mortar and of promoting the development of hydration reactions.

Mapecure SRA acts like an internal curing agent and, due 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 admix. This reduces the risk of cracking.

The product can be used also without using Mapecure SRA when environmental conditions permit an optimal curing.

Mapegrout Hi-Flow, once cured, has the following qualities:
· high flexural and compressive strength;
· the modulus of elasticity and coefficients of thermal expansion and permeability to water vapour are similar to those of
high quality concrete;
· waterproof;
· very high adhesion to old concrete, when it has been saturated with water beforehand and to reinforcing rods especially
if they have been treated with Mapefer or Mapefer 1K;
· high resistance to wear from abrasion.

Mapegrout Hi-Flow 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 R4.

Mapegrout Hi-Flow is recommended for thicknesses up to 40 mm thick. For greater thicknesses, it is recommended to add suitable graded aggregates from 30 to 50% by weight of the product, only after consulting our Technical Services Department.
If higher flexural and impact resistance are required, Mapegrout Hi-Flow TI 20 should be used, castable, shrinkagecompensated, fibre-reinforced, high-ductility cementitious mortar with stiff steel fibres.

Areas of Use

To repair structures where particular thicknesses and the state of deterioration require the use of high flow mortars.

Mapegrout Hi-Flow is suitable to repair bridge structure where a flowable repair concrete is required and complies with the HE standard for repairing such structures.

Some application examples
· Structural reinstatement of reinforced concrete beams and pillars.
· Restoring the lower flanges of pre-stressed concrete beams of viaducts.
· Reinstatement of floor beams and slabs after scarification of deteriorated areas.
· Restoring concrete floors (industrial, road and airport).
· Grouting rigid joints between concrete elements.