Waterproof Cement Morocco — Concrete Sealing

What is waterproof cement?

Waterproof cement — also called watertight or impermeable cement — is a Portland cement (CPJ 45 or CPJ 55) with waterproofing admixtures that block the concrete capillaries and reduce its water absorption by 70 to 90%. This property is crucial for all structures in permanent or occasional contact with water: pools, basements, tanks, foundations, tunnels, pipes. Without waterproof cement, standard concrete lets water through by capillarity and permeability under pressure, causing infiltration, mold, rebar corrosion and structural degradation.

Waterproof cement retains all the mechanical properties of Portland cement (compressive strength 42.5-55 MPa, durability, workability) while adding waterproofing. Its water vapor permeability is retained: the concrete "breathes", avoiding internal condensation and disorder pathologies. The surcharge compared to standard cement is limited (10 to 20%) and largely offset by savings on complementary waterproofing works and structure durability.

How does waterproof cement work?

Waterproof cement works through two complementary mechanisms integrated into the concrete mass: (1) capillary action — waterproofing additives (silicates, sodium metasilicates) react with the free lime Ca(OH)₂ released by clinker hydration to form insoluble calcium silicate gels that block capillaries; (2) hydrophobic action — mass water-repellents (fatty acids, stearates, polymer resins) coat the pore walls and create a lotus effect that repels water by surface tension. Water beads on the surface without penetrating, even under low pressure.

For optimal waterproofing, waterproof cement must be combined with a careful concrete formulation: cement dosage ≥ 350 kg/m³, W/C (water/cement) ratio ≤ 0.5, careful compaction (vibration), prolonged curing 7 days minimum. For highly stressed structures (pools, pressurized tanks), a two-coat surface waterproofing render (waterproof micro-mortar) is systematically added. Waterproof cement guarantees mass waterproofing that remains effective even in case of concrete microcracking.

Waterproof cement vs standard cement

Price and application advice

Waterproof cement costs about 10 to 20% more than standard Portland cement, due to integrated waterproofing additives. At Dakhla Aménagement, waterproofed CPJ 45 starts at 1,700 DH/T in bulk, 90 DH per 50 kg bag and 1,780 DH/T in 1T big bag. Waterproofed CPJ 55 starts at 1,800 DH/T in bulk, 95 DH per bag and 1,880 DH/T in big bag. For small sites, you can also buy a liquid waterproofing admixture (80-150 DH/L, dosage 1-2 L/m³) to add to a standard Portland cement. Volume-degressive prices — free quote within 24h.

Application advice: (1) respect a cement dosage ≥ 350 kg/m³ (pools: 400 kg/m³); (2) maintain W/C ratio ≤ 0.5 — excess water ruins waterproofing; (3) carefully vibrate fresh concrete to eliminate air pockets; (4) cure 7 days minimum for complete hydration; (5) for pressurized structures (pools, tanks), also apply a two-coat surface waterproofing render; (6) check the absence of differential shrinkage (expansion joints). For complete technical support, contact our team.

Why choose Dakhla Aménagement (SDAD)?

• Local production in Dakhla — waterproof cement available on order
• Waterproofing admixtures certified compliant with NF EN 934-2
• Systematic quality control: capillary absorption tested in laboratory
• Project technical advice: dosage, W/C ratio, complementary renders, curing plan
• Three packaging options: bulk (≥30T), 50kg bags (1T pallet), 1T big bag
• Delivery across Southern Morocco (Dakhla, Laayoune, Boujdour, Tan-Tan) and Mauritania