Frequently Asked Questions

How is Fosroc Durocrete applied to fresh concrete and what is the timing relative to concrete placement?

Fosroc Durocrete dry-shake application timing is critical — it must be applied to the concrete surface while the concrete is still in the plastic state and bleed water is rising to the surface, but not so early that the concrete is too soft to support the power trowelling that incorporates the dry shake into the surface. The sequence of operations for dry-shake floor construction is: place and spread the concrete to the specified level and initial screed to grade; allow bleed water to begin rising to the surface and the concrete to reach the correct stiffness for power floating (typically 1 to 3 hours after placement, depending on the concrete mix, ambient temperature, and section thickness); at the power floating stage, broadcast the first application of Durocrete over the concrete surface at half the specified coverage rate, allow the broadcast material to absorb the bleed water for 10 to 15 minutes, then float the surface with a power float to incorporate the dry shake into the concrete surface; apply the second half of the specified coverage rate of Durocrete, allow to absorb, and power float again; finish the floor surface with power trowelling to close the surface and achieve the specified floor finish (fine trowelled for smooth warehouse floors). In Indian summer conditions (high ambient temperature, fast concrete stiffening), the bleed water phase is shorter and the timing of dry shake application must be earlier — experienced floor contractors monitor the concrete stiffening closely to apply the Durocrete at the correct stage.

What is the difference between a dry-shake hardener floor and an epoxy-coated concrete floor for a warehouse and which is more appropriate?

Both dry-shake hardener floors and epoxy-coated floors are widely used in Indian industrial warehouses and factories, and they serve different performance requirements and budget profiles. A dry-shake Durocrete floor is a monolithic concrete floor with an enhanced surface hardness — the hard surface is part of the concrete slab, approximately 3 to 5 mm deep, and provides excellent abrasion resistance against forklift tyres, pallet impact, and general warehouse traffic. The surface is grey (or a selected oxide colour) with a concrete appearance, is not impermeable to liquid spills (small quantities of liquid can be absorbed into the concrete), and does not provide chemical resistance to oils, acids, or solvents. An epoxy floor coating system (Nitoflor Epoxy SL or similar) applied over a concrete substrate is a separate layer providing: a sealed, impermeable surface that resists liquid absorption and spill ingress; chemical resistance to the specific chemicals used in the facility; a smooth, easy-clean surface that can be wet-mopped regularly; and a decorative range of colours for bay marking, walkways, and safety zones. The choice between the two depends on the facility requirements: for general warehousing without chemical spill risk, a Durocrete dry-shake floor is cost-effective, durable, and requires minimal preparation for the main warehouse areas, while a thin epoxy seal coat may be used in inspection and office areas. For food and beverage, pharmaceutical, or chemical processing facilities where impervious, chemically resistant, and hygienic floor surfaces are required, an epoxy system is the appropriate specification.

Does Fosroc Durocrete eliminate the need for a separate concrete curing compound after trowelling?

After power trowelling and finishing the Durocrete dry-shake floor, the fresh concrete surface must still be cured effectively to achieve the specified concrete and surface layer strength and to prevent plastic shrinkage cracking. A Fosroc curing compound (such as Concure WB or a similar wax or resin-based curing membrane) should be applied to the finished Durocrete surface immediately after the final power trowelling pass. The curing compound forms a temporary membrane on the floor surface that retards the evaporation of mix water from the concrete, allowing the cement in the concrete body and the dry-shake surface layer to continue hydrating under the retained moisture. Without adequate curing, particularly in Indian hot and windy weather, the surface water evaporates too rapidly before the concrete achieves adequate early strength, leading to surface cracking (plastic shrinkage cracks) and reduced final strength of the dry-shake surface layer. The curing compound should remain effective for a minimum of 7 days — the critical initial curing period. Alternative curing by wet hessian and polythene sheeting is also effective but labour-intensive on large warehouse floor areas. For Durocrete floors that will subsequently receive an epoxy or polyurethane coating, the curing compound type must be compatible with the planned coating system — some solvent-free floor coating systems require removal of wax-based curing compounds by mechanical grinding before coating application.