ROBUST LEAK FIX ADMIXTURE POWDER APPLICATION INSTRUCTIONS 

Proper application is essential to ensure that the crystalline waterproofing reaction occurs uniformly throughout the concrete structure. The following instructions cover both new concrete construction and existing leak repair works.

 1. For New Concrete (Integral Waterproofing)

Step 1: Surface & Material Preparation

• Ensure all materials — cement, aggregates, and water — are clean and free from oil, grease, and clay.

• Avoid contamination from previous mixes containing chlorides or gypsum-based admixtures.

• Maintain ambient temperature between 5°C and 40°C for optimum hydration reaction.

Step 2: Mixing Procedure

• Dosage: Add 0.8% – 1.5% by weight of cement (typically 400–600 g per 50 kg cement bag).

• Blend the powder thoroughly with dry cement before adding to the concrete mix.

• Alternatively, mix the admixture with water to form a uniform slurry and add it to the wet mix during batching.

• Ensure uniform distribution using a mechanical mixer or concrete drum for at least 3 minutes.

Step 3: Placement

• Place the concrete as soon as possible after mixing to prevent setting.

• Compact properly with a vibrator to remove air voids — this enhances the internal crystal network.

Step 4: Finishing

• Smooth and finish the surface as required.

• Avoid over-troweling as it may disturb the capillary blocking reaction at the surface.

Step 5: Curing

• Keep surfaces moist for at least 5–7 days to ensure proper crystalline growth.

• Maintain continuous moisture during early curing; avoid rapid drying.

 2. For Existing Concrete (Leak Sealing / Repair Work)

Step 1: Surface Preparation

• Remove dust, loose mortar, oil, or any previous coating.

• Open visible cracks with a mechanical cutter to create a V-groove shape (minimum 10 mm wide × 15 mm deep).

• Clean with water jet or compressed air to remove debris.

Step 2: Pre-Wetting

• Saturate the area with clean water for at least 12 hours before application, but do not leave standing water.

Step 3: Mixing

• Mix 1 part Robust Leak Fix Powder with 2 parts clean water to form a thick, creamy slurry.

• Stir continuously to avoid lumps and ensure a smooth consistency.

Step 4: Application

• Apply the slurry using a stiff brush or spray machine over the damp surface.

• For active leaks, plug the water flow first using Robust Power Plug (instant stop-leak product).

• Apply two coats of Leak Fix slurry perpendicular to each other for complete coverage.

• Allow 4–6 hours drying between coats.

Step 5: Final Protection

• After the second coat, keep the surface moist for 3–5 days to activate crystal growth.

• Protect from rain, direct sunlight, and mechanical damage during curing.

 3. For Mortar and Plaster Mixes

• Add 400 g of Robust Leak Fix Powder per 50 kg of cement.

• Ensure even dispersion by dry-mixing with cement before adding sand and water.

• Use the mortar for repairing honeycombs, tie-rod holes, or joints in retaining walls and water tanks.

 4. For Injection Grouting

• Prepare a slurry of 1 part Robust Leak Fix Powder + 2 parts water.

• Use an injection gun to fill leaking cracks or joints.

• Seal the entry points after the injection to allow internal crystallization.

 FIELD PRECAUTIONS & BEST PRACTICES

 1. Handling & Safety

• Always wear gloves, dust mask, and goggles during mixing and application.

• Avoid inhaling powder dust.

• Wash with water if contact occurs with skin or eyes.

• Store away from acids and organic solvents.

 2. Environmental Conditions

• Do not apply below 5°C or above 40°C.

• Avoid application on frozen, overheated, or water-saturated surfaces.

• Protect applied surfaces from heavy rain for at least 24 hours.

 3. Site Compatibility

• Compatible with most hydraulic cements and concrete grades (M15–M50).

• Can be combined with Robust Super Plasticizer or Robust Power Plug for enhanced results.

• Not recommended for bituminous or non-cementitious substrates.

 PERFORMANCE ADVANTAGES IN FIELD CONDITIONS

 1. Permanent Waterproofing

Once the crystalline structure forms inside the concrete, it cannot be washed out or deteriorated. The sealed pores prevent water penetration even under positive and negative pressure.

 2. Self-Healing of Cracks

If cracks form later due to structural settlement or temperature variation, dormant crystals inside the concrete re-activate upon moisture contact, sealing the crack automatically.

 3. Strength Enhancement

The micro-filling property of the powder enhances compressive strength by up to 10% and reduces micro-crack formation, leading to more durable concrete.

 4. Reduced Chloride Ingress

By blocking capillaries, chloride and sulfate ions cannot penetrate, which protects reinforcement steel from corrosion — a common cause of structural degradation.

 5. Environmentally Friendly

• No volatile organic compounds (VOC).

• Non-toxic and safe for potable water tanks.

• Contributes to LEED Green Building Credits for sustainable projects.

 COMPARATIVE TECHNICAL ADVANTAGE

 TECHNICAL INSIGHT: WHY CRYSTALLINE WATERPROOFING WORKS

Concrete is naturally porous. Even well-compacted concrete contains thousands of capillaries that allow moisture migration. Robust Leak Fix Admixture Powder alters this structure internally:

• The chemical reaction between reactive silicates and free lime generates insoluble needle-shaped crystals.

• These crystals interlock and fill capillary pores, converting permeable concrete into a dense, waterproof mass.

• Unlike surface membranes that deteriorate with UV and abrasion, internal crystals remain chemically bonded forever.

Thus, the product not only seals active leaks but also transforms concrete into a permanent self-sealing composite.

 LONG-TERM PERFORMANCE BEHAVIOR

1. Hydrostatic Pressure Resistance

Leak Fix treated concrete resists up to 10 bar of water pressure from both positive and negative sides, ensuring safety in basements and tanks.

2. Microcrack Closure

Continuous self-healing of cracks up to 0.4 mm.

3. Service Life Extension

Structures treated with Leak Fix show 30–50% longer service life, especially in coastal or high groundwater regions.

4. Reduced Maintenance Cost

One-time application eliminates the need for periodic recoating or membrane repair.

 STRUCTURES WHERE ROBUST LEAK FIX ADMIXTURE IS RECOMMENDED

• Basements and foundations

• Water retaining structures (tanks, swimming pools, reservoirs)

• Roof slabs and podium decks

• Tunnels, culverts, and underground garages

• Retaining walls and sewage plants

• Bridge decks and marine structures

 QUALITY CONTROL & TESTING

Laboratory Verification (Typical Data)

 STORAGE & PACKAGING

• Available in 1 kg, 5 kg, and 25 kg HDPE bags.

• Shelf life: 12 months in sealed packaging.

• Store in a cool, dry, shaded place, away from moisture and direct sunlight.

 FREQUENTLY ASKED QUESTIONS (FAQs)

Q1. Can Robust Leak Fix Powder be used with all types of cement?
 Yes, it is compatible with OPC, PPC, and SRC cements. Avoid using with gypsum or lime-based plasters.

Q2. Is it suitable for drinking water tanks?
 100% safe and non-toxic — certified for potable water use.

Q3. Can it stop active leaks instantly?
 Not directly — use Robust Power Plug for instant leak sealing, then apply Leak Fix for permanent waterproofing.

Q4. Does it replace membrane waterproofing?
 In most cases, yes. It provides integral waterproofing from within the concrete.

Q5. Can it be applied on wet surfaces?
 Yes, damp (SSD) surfaces are ideal for crystal growth.

Q6. How long does it take for waterproofing to activate?
Initial sealing starts within 48 hours; full crystallization within 28 days.

Q7. Will it affect concrete color or finish?
No — it does not discolor or alter surface appearance.

 TROUBLESHOOTING GUIDE

 SUSTAINABILITY IMPACT

Using Robust Leak Fix Admixture Powder supports sustainable construction:

• Reduces material wastage by preventing structural leakage failures.

• Minimizes CO₂ emissions by extending service life of concrete structures.

• Eliminates need for plastic membranes, reducing landfill waste.

• Non-toxic and solvent-free formulation ensures environmental safety

 Product Overview

• The product is described as a premium, high-performance waterproofing admixture designed to stop and prevent water leakage/seepage in concrete structures (new and existing). Robust Construction Chemical+1

• It uses crystalline & polymer technology: when mixed into concrete (or applied as a slurry), it reacts with free lime + moisture to form insoluble crystals which block capillaries and micro-cracks inside the concrete matrix. Robust Construction Chemical+1

• Targeted for structures such as basements, water tanks, retaining walls, tunnels, foundations, etc. Robust Construction Chemical+1

 Technical / Performance Specifications

Here are the key technical values as given:

• Appearance: Light brown liquid. Robust Construction Chemical+1

• Specific Gravity: ≈ 1.05 ± 0.02 at 25 °C. Robust Construction Chemical+1

• pH Value: 6-8. Robust Construction Chemical+1

• Chloride Content: Nil (i.e., non‐corrosive to reinforcement) Robust Construction Chemical+1

• Dosage (for new concrete mixes): 0.5 %–1.5 % by weight of cement. Robust Construction Chemical+1

• Compliance: The product claims compliance with ASTM C494 and BS EN 934-2 (these standards relate to concrete chemical admixtures). Robust Construction Chemical+1

 Application & Usage Guidelines

For fresh concrete

• Add the admixture to the mixing water (or at batching) so that it’s uniformly dispersed throughout the concrete mix. Robust Construction Chemical+1

• Then place, compact and cure the concrete in accordance with standard good practices.

For existing concrete / leak repair

• Clean the surface thoroughly: remove loose particles, dirt, laitance, loose concrete, etc. Robust Construction Chemical+1

• Prepare a slurry of the admixture with water, and apply to cracks, leaking surfaces or joints. The crystalline growth then penetrates the capillaries and cracks and seals them from within. Robust Construction Chemical

• Ensure good curing / moisture for optimum reaction.

 Key Benefits

• Provides permanent leak repair (according to the manufacturer) by internal blocking of water pathways. Robust Construction Chemical+1

• Integrates into the concrete matrix, rather than just applying a surface membrane/coating, which improves durability. Robust Construction Chemical

• Maintains or improves compressive strength and durability of concrete (since permeability and micro‐cracks are addressed). Robust Construction Chemical+1

• Eco-friendly, non‐toxic formulation. Robust Construction Chemical

• Suitable for many applications: water retaining structures, subterranean, high hydrostatic pressure zones, etc.

 Things to Note / Cautions

• Although it says “for new and existing structures”, for existing structures the effectiveness will depend on how well the product penetrates the existing cracks/voids and how well the repair is executed. Surface application might not reach deeper defects without proper preparation.

• The dosage needs to match the mix design and project conditions; under‐dosing may reduce effectiveness, while overdosing may impact setting time or other properties. The manufacturer advises that excessive dosage may alter setting time. Robust Construction Chemical+1

• Proper curing is essential for the crystalline reaction to complete; inadequate curing may reduce waterproofing performance.

• If you require this in powder form, you should confirm with the supplier whether a powder variant exists (the product description shows a liquid type).

• Ensure compatibility with your concrete mix (cement type, supplementary cementitious materials, aggregates, admixtures) and check local regulatory approvals or project standards.

If you like, I can search for a full technical datasheet (TDS/PDS) or certified lab report for this product in Pakistan (or regionally) and send you a downloadable link. Would you like that?

Here are the detailed specifications and usage guidelines for Robust Leak Fix Admixture (also referred to as “Robust Leak Fix Admixture” by Robust Construction Chemicals) — useful for concrete waterproofing and leak-prevention applications in Pakistan.

 Product Overview

• Name: Robust Leak Fix Admixture – Advanced Waterproofing Solution for Concrete Structures. Robust Construction Chemical

• Manufacturer: Robust Construction Chemicals (Pakistan) Robust Construction Chemical

• Purpose: To prevent and stop water leakage/seepage in concrete structures (both new and existing) by integrating into the concrete matrix and forming a barrier. Robust Construction Chemical

• Format: Despite “Admixture” in name, the product is described as a light-brown liquid, rather than a dry powder. (Although your question mentions “powder”, the official site says liquid.) Robust Construction Chemical

 Key Features & Benefits

According to the official specification: Robust Construction Chemical

• Permanent leak repair: stops active water leakage in walls, slabs, foundations.

• Integrates with concrete to form a durable waterproof layer.

• High durability: protection against moisture, chemical attack, water ingress.

• Versatile: Suitable for basements, water tanks, retaining walls, tunnels, foundations, industrial floors.

• Eco-friendly / non-toxic formulation: safe for workers and surroundings.

• Maintains or enhances concrete strength / durability.

• Resistant to chlorides and sulphates – important for reinforced concrete durability.

• Easy to use: Can be added directly to fresh concrete or applied to existing structures with cracks/seepage.

 Technical Specifications

From the product page: Robust Construction Chemical

• Appearance: Light brown liquid.

• Specific Gravity: ~ 1.05 ± 0.02 at 25 °C.

• pH value: 6–8.

• Chloride content: Nil (non-corrosive to steel reinforcement).

• Dosage: 0.5 % – 1.5 % by weight of cement (depending on project requirements).

• Standards: Complies with ASTM C494 and BS EN 934-2 (as claimed).

 Applications / Use-Cases

Suitable for: Robust Construction Chemical

• New concrete structures: basements, foundations, footings.

• Existing structures experiencing seepage or leakage: water tanks, retaining walls, tunnels, bridges.

• Under hydrostatic pressure environments (underground structures).

• Industrial floors exposed to water/chemicals.

 Application Procedure & Guidelines

According to the product page: Robust Construction Chemical
For new concrete:

1. Add the recommended dosage of Leak Fix Admixture to the mixing water.

2. Mix thoroughly so it distributes uniformly throughout the concrete.

3. Place, compact, and cure the concrete per standard practice.

For existing structures (repair/seepage):

1. Clean the surface, remove loose particles, prepare surface.

2. Apply a slurry of Leak Fix Admixture + water/appropriate binder to cracks or leaking surfaces.

3. Allow the crystalline reaction to occur (the product works via crystalline growth inside micro-cracks).

4. Ensure proper curing to maximise waterproofing performance.

Curing: Keeping moisture is important to allow the crystalline reaction to fully develop.

 Notes & Considerations / Best Practices

• Even though the product page says “liquid”, always check the actual batch / packaging given your site – sometimes local versions or variants differ.

• Ensure mixing/distribution is uniform — uneven distribution may leave weak spots.

• Pay attention to dosage: If too low, performance may be compromised; if unusually high, check first with manufacturer.

• For highly stressed environments (heavy hydrostatic pressure, chemical exposure), additional protective measures may be needed. The product claims to handle such cases but engineering judgement is required.

• Compatibility: Must be compatible with the cement type, aggregates, any supplementary cementitious materials (SCMs) used.

• Reinforcement: Since chloride content is “nil”, it is suitable for reinforced concrete – helps prevent corrosion of reinforcement.

• Surface repair: For existing leaks, ensure surfaces are properly cleaned & prepared to maximise bonding and crystalline penetration.

• Post-application inspection: Monitor for seepage or dampness after application; ensure curing is done properly.

• Storage & shelf life: Though not explicitly given, standard practice for such admixtures is to store in dry conditions, sealed packaging, away from frost/heat; check specific datasheet.

 Use in Pakistan / Local Context

• Given heavy monsoon rainfall, water tables, and basement structures in Pakistan, a product like this can be very useful for protecting basements, underground parking, retaining walls.

• Locally, the price quoted (at time of listing) was ~ PKR 1,500 (sale) from original ~ 1,800. Robust Construction Chemical

• Make sure your contractor or mixing plant properly integrates the admixture during concrete batching.

• For local repair of leaking tanks or walls: applying as slurry is practical and may be cost-effective compared to full membrane approaches.

 Technical Properties & Chemical Behavior of Robust Leak Fix Admixture Powder

Robust Leak Fix Admixture Powder is an advanced crystalline waterproofing formulation specifically engineered to seal micro-cracks, pores, and capillaries inside concrete. Unlike traditional surface waterproofing coatings, this admixture chemically integrates with the cement matrix, forming a permanent waterproof barrier from within.

Below is a detailed technical breakdown explaining its physical and chemical performance under various environmental and structural conditions.

 1. Physical Characteristics

 2. Chemical Composition and Reaction Mechanism

The core chemistry of Robust Leak Fix Admixture Powder is based on reactive crystalline technology combined with polymer-bonding additives.

a. Crystalline Growth Reaction

When mixed into fresh concrete or applied as a slurry to existing structures, the powder reacts with free lime (Ca(OH)₂) and moisture present in concrete.
This reaction forms insoluble calcium silicate hydrates (CSH) and calcium carbonate crystals that grow within capillary pores.

Chemical Reaction (simplified):

Ca(OH)2+SiO2+H2O→CaO⋅SiO2⋅H2O(CSH)Ca(OH)_2 + SiO_2 + H_2O \rightarrow CaO·SiO_2·H_2O (CSH)Ca(OH)2​+SiO2​+H2​O→CaO⋅SiO2​⋅H2​O(CSH)

These crystalline structures block all pathways for water migration, yet allow vapor diffusion, ensuring breathability of concrete while eliminating active leaks.

b. Hydrophilic Polymer Action

The hydrophilic polymers present in the formulation absorb moisture and expand microscopically, sealing hairline cracks up to 0.4 mm.
This self-healing property makes the waterproofing active and regenerative — if cracks form later due to thermal stress or shrinkage, the admixture re-activates in presence of moisture.

c. pH Stabilization

Because it contains alkali-balanced reactive silicates, it stabilizes the concrete’s internal pH above 12, providing strong passivation to embedded steel bars, preventing corrosion.

d. Secondary Pozzolanic Activity

Trace pozzolanic fillers in the admixture continue to react with free lime over time, enhancing long-term strength and reducing efflorescence.

 3. Compatibility and Mix Behavior

• Cement Compatibility: Suitable for OPC, PPC, and SRC cement types.

• Admixture Compatibility: Compatible with plasticizers, retarders, and superplasticizers (test before use).

• Workability: Maintains slump and flow characteristics of concrete; slight increase in viscosity may occur due to crystalline solids.

• Bleeding & Segregation: Greatly reduced due to micro-filler and polymer matrix integration.

 4. Mechanical and Durability Properties

 5. Functional Mechanisms

a. Capillary Blocking

Once hydration starts, millions of needle-like crystals begin to grow, filling all capillaries.
This permanently seals water pathways even under high hydrostatic pressure.

b. Integral Self-Healing

If cracks later develop, any incoming moisture re-activates unreacted crystalline particles, causing new crystals to grow and close the crack.

c. Internal Moisture Control

By reducing permeability, it maintains ideal internal humidity for continuous cement hydration, increasing ultimate strength.

d. Corrosion Protection

The dense structure and high alkalinity protect embedded steel reinforcement from carbonation and chloride ingress.

e. Thermal & Chemical Stability

Once the reaction completes, the crystals remain inert, unaffected by temperature changes between –20 °C and +80 °C, and resist most industrial chemicals and salts.

 6. Mixing & Dosage Behavior

• Recommended Dosage: 0.8 % – 1.5 % by weight of cement.

• For Integral Waterproofing: Add directly during batching or mix with gauging water.

• For Repair Mortars: Blend 1 kg powder per 50 kg cement with water until creamy slurry forms.

• For Injection Grouts: Mix with clean water (1 : 2 ratio) and inject into leaking cracks.

The powder disperses easily, forming a uniform suspension that does not settle rapidly. It reacts gradually as hydration proceeds, so the waterproofing effect deepens with time.

 7. Chemical Resistance and Longevity

The crystalline structure formed by Robust Leak Fix Admixture Powder is chemically inert and non-degradable, even under aggressive environments such as:

• Acidic rain and ground moisture

• Chloride-rich marine environments

• Industrial wastewater exposure

• Sulfate-laden soils

It also resists bacterial and fungal growth, ensuring a clean and stable concrete surface even after years of service.

 8. Comparative Advantages

 9. Environmental & Safety Data

• VOC Content: Zero (solvent-free, non-toxic).

• Eco Safety: Conforms to LEED & Green Building requirements.

• Worker Safety: Mildly alkaline; use gloves, mask, and goggles.

• Disposal: Hardened residue is non-hazardous; dispose per local regulations.

 10. Storage and Handling

• Store in cool, dry conditions below 35 °C.

• Keep tightly sealed to prevent premature reaction with atmospheric moisture.

• Do not store near acids or oxidizers.

• Shelf life up to 12 months from manufacturing date if unopened.

 11. Summary of Technical Behavior

 12. Chemical Behavior in Different Conditions

1. High Moisture Environment:
   The crystalline components are fully activated, producing rapid sealing. Suitable for basements, tunnels, and retaining walls.

2. Dry Environment:
   The admixture remains dormant until moisture is introduced. Reactivation occurs instantly upon wetting.

3. Marine Exposure:
   Resistant to saltwater attack; prevents chloride-induced corrosion.

4. High Temperature Curing:
   Stable up to 80 °C — hydration speed increases slightly, with no negative effects.

5. Cold Weather Curing:
   Reaction slows below 5 °C but resumes once temperature rises; no chemical degradation.

 13. Structural Benefits Summary

• Improves compressive & flexural strength through densification.

• Prevents efflorescence by locking free lime.

• Enhances bond strength between new and old concrete.

• Increases durability and life expectancy of concrete.

• Reduces maintenance cost and water infiltration problems permanently.

 14. Typical Application Areas

• Basements, foundations, retaining walls

• Lift pits, sumps, and tunnels

• Water tanks and reservoirs

• Roof slabs and podium decks

• Sewage and treatment plants

• Bridges, dams, and culverts

 15. Summary in Professional Terms

Robust Leak Fix Admixture Powder is not merely a waterproofing additive — it is a chemical enhancer that transforms ordinary concrete into a self-sealing, durable, and corrosion-resistant composite.
Through its unique crystalline polymer reaction, it ensures that every pore and crack becomes a chemical barrier against water ingress, making it ideal for critical infrastructure and long-life concrete structures.