About Fosroc Concure LP90M Standard

Fosroc Concure LP90M Standard is a ready-to-use, resin-based curing compound formulated for the modern Indian pavement and infrastructure sector, where consistent, code-compliant concrete curing is non-negotiable. It is supplied as an aluminised polymeric resin solution that is sprayed onto freshly finished concrete and dries to a continuous silver-coloured film. That film acts as a temporary membrane: instead of allowing the mix water to evaporate into the hot, dry air typical of an Indian summer, it traps the moisture at the surface so the cement can complete its hydration reaction. The result is concrete that gains its design strength more reliably and develops a denser, less permeable surface skin.

Traditional curing methods such as ponding, wet hessian or continuous water spraying are difficult to police on long linear works like highways and runways. Water is scarce on many sites, ponding is impossible on graded or sloping surfaces, and hessian dries out within hours in 40-plus degree heat. A membrane-forming compound like Concure LP90M Standard solves these practical problems in one spray pass, which is why it is specified on Pavement Quality Concrete (PQC) road projects, bridge works and airport runways where curing quality directly affects pavement life.

The aluminium flake content is the distinguishing feature of this grade. Beyond sealing in moisture, the flakes make the membrane light-reflective, bouncing solar radiation off the slab and reducing the surface temperature gain during the critical early-age period. Lower peak temperatures mean lower thermal gradients through the slab and a reduced risk of early thermal and plastic-shrinkage cracking. For Space Arc Engineering clients executing infrastructure contracts in Delhi NCR and across India, this makes Concure LP90M Standard a dependable, specification-friendly choice that aligns with both Indian highway authority practice and international ASTM curing standards.

The technical insight

The performance of Concure LP90M Standard hinges on water-retention efficiency, the property measured by ASTM C-156 and governed by the compliance standards ASTM C-309 and ASTM C-1315. A continuous, pinhole-free film is what delivers that retention, so the low specific gravity of 0.81 to 0.83 and the relatively volatile solvent carrier are deliberate: they let the resin flow out and form an unbroken membrane quickly before the carrier flashes off. The aluminium flakes orient roughly parallel to the surface as the film dries, creating an overlapping, mirror-like layer that both reflects infra-red radiation (reducing solar gain) and lengthens the diffusion path for any escaping water vapour. Timing is the critical variable on site: applied too early on bleeding concrete the compound floats and disperses; applied too late, after the surface has dried, the water it should have retained is already gone. The correct window is the moment the surface water sheen disappears but the concrete is still plastic. Coverage discipline matters equally, because the rated 3.5 to 5.0 m2 per litre assumes a uniform single coat; over-spreading thins the film below the threshold needed for ASTM-grade water retention.

Where it is used

• Curing of Pavement Quality Concrete (PQC) for national highways and expressways
• Concrete bridge decks and approach slabs
• Airport runways, taxiways and aprons
• Rigid concrete roads, service roads and industrial pavements
• Large-area ground slabs and hardstandings where ponding is impractical
• Concrete surfaces exposed to direct sun where solar heat gain must be limited

Key advantages

• Forms a continuous film barrier that retains mix water and ensures more complete cement hydration
• Aluminium flake content reflects solar radiation and reduces early-age surface temperature gain
• Single low-pressure spray application removes the labour and water demand of ponding or hessian curing
• Improves durability by reducing surface permeability and producing a harder, more dust-free finish
• Minimises plastic-shrinkage and early thermal cracking on large concrete pours
• Complies with internationally recognised ASTM C-309 and ASTM C-1315 curing-compound standards
• Silver film gives a clear visual check of coverage, so missed areas are easy to spot and re-coat
• Well suited to long linear and sloping works where water curing cannot be applied uniformly

Limitations & considerations

• Solvent-based and flammable; requires care with ignition sources, ventilation and appropriate PPE during spraying
• The dried film can impair adhesion of subsequent toppings, screeds, coatings or bonded overlays unless mechanically removed first
• Not intended where a permanent decorative or trafficable wearing finish is required from the membrane itself
• Application timing is critical: too early it disperses in bleed water, too late the moisture is already lost
• Coverage must be controlled, as over-spreading thins the film below the rate needed for effective water retention
• The aluminised silver appearance is not suited where a clear or colour-matched curing finish is specified
• Performance depends on a uniform, pinhole-free coat, so spray equipment and operator skill affect results

Selection & best practice

Specifications

Industry use cases

How we position Fosroc Concure LP90M Standard

Within the Fosroc curing range, Concure LP90M Standard sits as the aluminised, resin-based grade aimed at large pavement and infrastructure works, where its reflective film and ASTM C-309 / C-1315 compliance suit PQC roads, bridges and runways. It is a step up in solar-reflectance from non-aluminised wax or resin compounds such as Concure LP90 (clear/standard resin), Concure WB (water-based, lower-VOC), and Concure 1315 (white pigmented), each of which may be preferred where solvent content, colour or a water-based formulation is the deciding factor. Against competitor products it is broadly comparable to Sika Antisol membrane curing compounds, MBS (MB Solutions) and STP curing membranes, and Dr. Fixit Pidicure-type compounds; the right choice usually comes down to required ASTM compliance, aluminised versus white versus clear finish, VOC/solvent restrictions on the project, and whether a follow-on bonded finish is planned (which favours a removable or compatible system). As an authorised Fosroc distributor, Space Arc Engineering positions Concure LP90M Standard as the dependable specification-grade option for hot-climate, large-area pavement curing, and can advise on the most suitable Fosroc grade or alternative for a given project rather than defaulting to a single product.

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