Mapei Planigrout 300
Mapei Planigrout 300 is a three-component, super-fluid, solvent-free epoxy resin grout for the high-precision anchoring of structural elements into concrete and for the structural infill of confined cavities where dimensional stability and high mechanical strength are required. The product is supplied as Part A (liquid epoxy resin), Part B (amine hardener) and Part C (graded silica filler aggregate) in pre-measured kits, mixed on site by paddle mixer to a self-levelling pourable consistency. Planigrout 300 develops compressive strength of approximately 100 MPa at 28 days, modulus of elasticity around 7 GPa, and is dimensionally stable (negligible cure shrinkage) under ambient conditions. TRSC specifies Planigrout 300 for the bedding of steel column base plates, for the precision anchoring of post-installed structural reinforcement where injection adhesives are inappropriate (typically large bar diameter or oversize hole-to-bar annulus), for machine baseplate grouting on industrial repair scopes, and for the structural infill of bearing pad seats and bridge bearing plinths. The product is poured rather than injected, which makes it the engineering choice over injection adhesives for cavities with horizontal or vertical pour access where the design intent is full-section infill rather than annular bond.
Mapei Planigrout 300 occupies a specific specification slot in TRSC structural repair work: it is the high-strength, dimensionally-stable structural grout for poured infill applications where injection adhesives are not appropriate. The product is selected over Hilti HIT-RE 500 V4 injection epoxy on three job profiles: (1) large-diameter post-installed bar applications where the bar-to-hole annulus exceeds the injection adhesive's working range (typically over 8 mm annulus, or hole diameters exceeding 50 mm); (2) column base plate grouting on steel transfer columns where a 25-50 mm grout pad must transfer compression and shear from the column to the foundation; (3) bearing pad seat and bridge bearing plinth construction where the load transfer requires uniform contact and high compressive strength. The most common specification pitfalls TRSC encounters in the field are: (1) wrong grout selection — cementitious non-shrink grouts (typically 60 MPa class) are routinely substituted for Planigrout 300 by contractors looking to reduce material cost; the substitution fails on the dimensional-stability criterion and on the early-strength criterion when re-loading time is short; (2) inadequate venting — the pour cavity must include a vent path so the grout can displace air completely; trapped air pockets at the underside of column base plates are a common structural defect that is invisible until the column is later inspected; TRSC specifications require the contractor to detail vent locations and the pour sequence on the shop drawings; (3) cure-time confusion — Planigrout 300 reaches usable strength much faster than cementitious grout (50% of design strength at 24 hours at 23°C) but the contractor must hold the load off until full design strength is reached if the design called for full strength at re-loading; we specify a written re-load notification from the engineer rather than a calendar-based release. The product was used in the Q1 Tower Cyclone Albert Make Safe scope where the BMU davit base reinstatement required a high-strength, dimensionally-stable structural grout under tight programme constraints.
Specification questions about Mapei Planigrout 300
When does TRSC specify Planigrout 300 over an injection epoxy adhesive?
Is Planigrout 300 dimensionally stable on cure?
How is the pour vented to avoid trapped air pockets?
What standards govern Planigrout 300 specification?
- ReferenceMapei Mapei Planigrout 300 Datasheet