1. What is Microcement? (Summary)
Microcement is an ultra-thin decorative cement-based coating made from Portland cement or modified cements, water-based resins/polymers, micro-additives (fillers, superplasticizers), and mineral pigments. Key advantages: minimal thickness (typically 2–4 mm finished), strong adhesion to various substrates (concrete, epoxy, tile, plaster), seamless industrial/minimalist appearance, and continuous application on floors and walls.
2. Composition / General Formula
- Powder component (Premix): Very fine white or grey cement, mica/silica powder, and mineral additives.
- Liquid component (Binder): Water-based resins (acrylic/SBR polymers or specialized products) enhancing adhesion, flexibility, and workability.
- Additives and pigments: Superplasticizers, sealers, mineral/engineered pigments.
Industrial production typically uses pre-measured premix formulations; ratios vary by manufacturer. Reputable brands (e.g., Mapei) provide technical datasheets with recommended ratios and consumption rates.
Key note: Industrial production requires strict control of particle size (D95), poly-dispersion distribution, and polymer additive ratios—hence, professional applications usually rely on standardized premixes from trusted manufacturers.
3. How to Produce It – (Industrial/Workshop Explanation)
For market production, industrial methods require quality control, chemical analysis, and specialized equipment. For limited or DIY projects, using ready-made premix packs is recommended.
General industrial production line:
- Sourcing raw materials (fine-grained cement, silica powder, micro-fillers, pigments, additives).
- Dry grinding/mixing to create a homogeneous premix (moisture control <0.5%).
- Storage in dry silos with moisture-controlled filtration.
- Packaging with technical datasheets and SDS.
- Mixing guidelines for installers (water/resin ratio, superplasticizer/polymer percentage).
Example: Some datasheets specify superplasticizer at ~1–2% of cement weight; water-to-powder ratio varies by product—always follow the manufacturer’s datasheet.
4. Substrate Preparation (Prerequisite)
- Substrate must be clean, dry, free of oil, dust, and stable (no settling or movement).
- Cracks, joints, and expansion joints must be identified and addressed—microcement is not a replacement for expansion joints; flexible transition profiles or control joints should be installed.
- On tiles or smooth surfaces: Mechanical roughening or bonding primers is essential.
- On fresh cement/screed floors: Substrate moisture must be within product limits (typically <4–5% for floors).
Note: Underfloor heating (UFH) considerations are addressed below.
5. Step-by-Step Installation (Standard Professional Method)
(Abridged practical version—figures are approximate; always follow the manufacturer’s datasheet.)
- Primer / Bonding Layer
- Apply specialized primer to enhance adhesion and reduce substrate absorption (spray, roller, or brush).
- Drying time: Typically several hours to 24 hours depending on the product.
- First Base Coat (Preparation/Base Coat 1)
- Mix microcement with water/resin as instructed; each layer thickness ≈ 0.5–1.0 mm.
- For large areas or sensitive floors, embed fiberglass/mesh between layers to reduce cracking.
- After drying (typically 4–24 hours), sand and fill imperfections.
- Second Base Coat (Base Coat 2)
- Apply a second layer for increased thickness and uniformity; light sanding after drying.
- Final Coat(s)
- Apply 1–2 final layers with meticulous work for desired texture and color. Between coats, use fine sandpaper (e.g., 120–240 grit) to remove particles and smooth the surface.
- Pre-sealer and Top Sealer
- Apply at least two layers of pre-sealer, followed by two layers of top sealer (typically water-based polyurethane or epoxy/polyurethane) for abrasion and water protection.
- For wet areas (bathrooms, pools), use waterproof/epoxy systems and add anti-slip additives if needed.
6. Required Tools and Materials
- Low-speed mixer (pan mixer or drill mixer)
- Stainless steel trowel (specialized for microcement)
- Float for final smoothing
- Fiberglass mesh or interlayer mesh
- Orbital/pad sander with various grits
- Primer, resin binder, sealer (water-based polyurethane or epoxy recommended for high-traffic floors)
- PPE: Respirator (for fine particles), goggles, resistant gloves, adequate ventilation.
7. Technical Tips and Execution Details (Experience-Based)
- Final thickness: Typically 2–4 mm; avoid overly thick layers to prevent cracking.
- Reinforcement mesh: For high-traffic floors, potentially cracked surfaces, or applications over tiles, embedding fiberglass mesh between base coats is highly effective.
- Movement/expansion joints: Do not cover structural expansion joints—use flexible profiles or transfer joints.
- Moisture and drying time: Damp substrates cause delamination and failure; measure moisture before starting.
- Environmental conditions: Application temperature typically +5°C to +35°C with controlled relative humidity; avoid direct wind or intense sunlight during sealer application.
- Compatibility with underfloor heating (UFH): Microcement is generally UFH-compatible but must use approved products. Fully cure the screed/heating system before application, and follow a gradual heating/cooling protocol post-installation.
8. Common Problems and Prevention (How to Avoid Errors)
- Cracking: Mainly due to substrate movement or poor preparation. Use mesh, apply thin layers, and properly address control joints.
- Delamination / Peeling: Often caused by poor substrate preparation or incorrect primer—ensure proper cleaning, roughening, and use of recommended primers.
- Color variation / Staining: Results from uneven pigment mixing, differential moisture between layers, or sealer penetration. Ensure uniform application and conduct color sampling beforehand.
- Bubbles / Pitting: Caused by overly wet mix or air entrapment—strictly follow mixing ratios and techniques.
9. Safety and Standards
- Due to fine particles and cement content, use particle masks (FFP2/FFP3), ensure proper ventilation, and avoid skin contact with wet mix.
- Always read and adhere to the manufacturer’s Technical Data Sheet (TDS) and Safety Data Sheet (SDS).
10. Quick Installation Checklist (Before/During/After)
Before: Stable substrate, appropriate moisture, tools ready, product datasheet reviewed.
During: Primer → 2 base coats (with mesh if needed) → 1–2 final coats → sanding → pre-sealer → top sealer.
After: Protect the surface until full cure (several days to weeks); avoid heavy washing until sealer is fully stable.
11. Technical Resources (Quick Reference)
- Introduction and principles of microcement — Topciment.
- Step-by-step microcement installation guide — Topciment (preparation/layering steps).
- Sample technical datasheets and mixing ratios — Mapei (micro-topping and additive products).
- Notes on UFH compatibility and installation conditions — Homebuilding analysis.
- Common problems and solutions (delamination, cracking) — Specialized repair/installation articles.
Final Word (Short, Motivational & National)
Microcement is a powerful tool for creating modern, unified, and functional spaces—provided that science, standards, and execution precision are respected. If Iranian technical teams employ localized formulations and rigorous quality control, we can produce a national product while delivering installations worthy of Iranian architecture—economical, sustainable, and beautiful.
