Every year, construction projects lose an estimated 8–12% of their cement deliveries to improper storage and handling. That’s not a rounding error. That’s entire truckloads of material turning to stone before it ever reaches a mixer. Proper cement storage and handling is one of the most overlooked ways to protect your materials investment and keep your project from bleeding schedule days. Cement loses up to 20% of its compressive strength after just three months of storage under poor conditions, according to IS 4082.
If you’ve ever opened a storage shed to find cement bags fused into solid blocks, you already know how quickly moisture destroys this material. You also know the frustration of watching budget dollars literally crumble. If you want to know how to store cement properly, this guide covers the methods, the safety rules, and the cost data — including a checklist you can post on site today.
Key Takeaways
- Cement loses approximately 20% of its 28-day compressive strength after 3 months of improper storage, and up to 40% after 12 months (IS 4082).
- Bulk cement storage in silos costs roughly 175/tonversus352/ton for bagged cement — a 50% saving that can exceed $50,000/year for small batch plants.
- The 10 non-negotiable storage rules — from 150–200mm ground elevation to FIFO rotation — are standard across OSHA, IS 4082, and ASTM guidelines.
- OSHA 29 CFR 1926.702 mandates specific requirements for bulk cement storage; failure to comply puts both workers and projects at risk.
- A simple field test (finger rub) can tell you if stored cement is still usable, but lab testing per ASTM C109 is required for structural applications.
Why Proper Cement Storage and Handling Matters
The Cost of Improper Cement Storage
Cement is one of the most moisture-sensitive materials on any construction site. Leave it exposed to humid air or rain, and the hydration reaction begins. Not in a mixer where you want it, but inside the bag or silo, where it destroys the material from the inside out. A single compromised delivery of 500 bags at 12eachmeans6,000 wasted in an instant. Scale that across a multi-month project with multiple deliveries, and losses climb well into five figures.
How Moisture Destroys Cement Quality
Cement consists of fine particles of calcium silicates, aluminates, and ferrites. When these particles encounter water, even humidity from the air, they begin to hydrate. This hydration forms calcium silicate hydrate gel, the same compound that gives concrete its strength. But when hydration happens in storage instead of in a mixer, it creates partial setting inside the bag. That means reduced binding capacity, weaker concrete, and potentially catastrophic structural failures.
Understanding how to prevent cement from hardening in storage starts with understanding the enemy: moisture in any form. Cement with more than 5% moisture content should not be used for construction, according to The Constructor. Even at lower moisture levels, the damage compounds over time: lumps form, particle surfaces become pre-hydrated, and the material’s ability to achieve design strength drops steadily.
For more on how properly stored cement for concrete mixing ensures your final product meets design specifications, see our concrete mixing guide.
Real-World Impact on Project Timelines and Budgets
Bad cement doesn’t just cost money in wasted material. It costs time. When a quality test flags a batch as compromised, the project stops. Replacement cement must be sourced, delivered, and tested before work can resume. On a tight schedule, that delay ripples downstream. Framing crews wait. Finishers get pushed back. The cost multiplies far beyond the price of the cement itself.
Bagged vs. Bulk Cement: Which Storage Method Fits Your Site?
Bagged Cement Storage — When and Why
Bagged cement (typically 50 kg or 94 lb bags) remains the standard for small to mid-sized projects, remote sites without silo infrastructure, and situations where multiple cement types are needed simultaneously. Bags are easier to transport to difficult locations, simpler to inventory by count, and allow precise batch measurement without specialized equipment.
The catch: bags are far more vulnerable to moisture ingress through seams and packaging. They require manual handling, which introduces ergonomic risks and potential for bag damage. And the per-ton cost is significantly higher than bulk.
Bulk Cement Storage in Silos — When and Why
Bulk cement storage in silos is the preferred method for large-scale operations, ready-mix plants, and any project with consistent, high-volume cement consumption. Silos protect cement from environmental exposure, enable pneumatic transfer directly to batching systems, and dramatically reduce handling labor and waste.
The key advantage is control. A well-maintained silo with proper aeration and moisture control keeps cement in near-factory condition for extended periods. The initial investment in silo infrastructure pays for itself through material savings and operational efficiency.
Cost Comparison: Bagged vs. Bulk Cement Storage
| Factor | Bagged Cement | Bulk Cement (Silo) |
|---|---|---|
| Approximate cost per ton | $352 | $175 |
| Moisture spoilage rate | 8–12% typical | <1% with proper silo |
| Handling labor | High (manual) | Low (pneumatic/automated) |
| Storage space efficiency | Low (stacked bags) | High (vertical silo) |
| Initial infrastructure cost | Minimal | Moderate to high |
| Best for | Small/remote projects | Large/recurring operations |
| Annual savings potential (small batch plant) | — | $50,000+ |
Sources: ReadyMixer; cost figures are approximate as of 2026 and vary by region.
10 Cement Storage Rules That Actually Prevent Spoilage
These 10 rules show up in every major standard, from IS 4082 to OSHA, because they actually work. Follow them consistently, and you’ll cut cement spoilage to a fraction of what most sites experience.
1. Choose a Dry, Enclosed Storage Area
You need a real room. Four walls, a solid roof, a floor that doesn’t sweat. An open-sided shelter might look like it’s doing the job until the first rainstorm blows sideways and you’re picking up soaked bags the next morning. In high-rainfall or humid regions, an enclosed storeroom isn’t a luxury. It’s the difference between usable cement and a very expensive pile of gravel. The storage area should be located away from areas prone to flooding, drainage runoff, or groundwater seepage.
2. Elevate Cement Off the Ground (Minimum 150–200mm)
Never place cement bags directly on the ground or on a bare concrete floor. Moisture wicks upward through capillary action, even through concrete that looks bone-dry. Stack bags on raised wooden platforms, pallets, or brick supports at least 150–200mm (6–8 inches) above floor level, as specified by IS 4082 and The Constructor. This gap also allows air circulation beneath the stack, further reducing moisture risk.
3. Stack Bags Correctly (Max 10 Bags High, Cross-Stacking)
Stack cement bags no higher than 10 bags per pile. Higher stacks crush the bags beneath them, damage packaging, and create pressure points where moisture can penetrate. Use a cross-stacking pattern, alternating the direction of each layer, to create a stable, interlocking stack that resists tipping. Leave at least 300mm (12 inches) of clearance between stacks and between stacks and walls to allow ventilation and inspection access.
4. Maintain Proper Ventilation
Airflow prevents moisture buildup inside the storage area. Install vents near the floor and ceiling to create cross-ventilation. In humid climates, consider mechanical ventilation or dehumidification. Avoid sealing the storage room completely. Stagnant, humid air is worse than fresh air with moderate humidity.
5. Keep Cement Away from Water Sources and Chemicals
Cement should never be stored near water pipes, drainage channels, or chemicals. A burst pipe or a chemical spill can destroy an entire stock in minutes. Keep at least 10 meters of separation between cement storage on your construction site and any water source or reactive material. If water supply lines must pass through the storage area, ensure they are insulated and regularly inspected.
6. Separate Different Cement Types and Grades
Different cement types, Ordinary Portland Cement, Rapid Hardening Cement, Sulphate Resistant Cement, and others, must be stored in clearly separated areas. Mixing types during batching can produce concrete with unpredictable properties. Label each storage zone and train all personnel on identification protocols. For more on cement classification, see our guide to different types of cement and their grades.
7. Cover Stacks with Waterproof Tarpaulin
Even with a solid roof overhead, condensation drips and roof leaks find their way to your cement. That’s why waterproof tarpaulin over every stack is non-negotiable. It provides a second line of defense against roof leaks, condensation drips, and airborne moisture. Ensure the tarpaulin extends fully over the stack without gaps, and secure it against wind if the storage area has open entry points.
8. Follow FIFO (First-In, First-Out) Rotation
Date every delivery when it arrives. New stock goes behind old stock. Issue from the front. That’s FIFO, and it prevents old cement from aging out while new stuff gets used first. The oldest cement in your storage area should be the first cement used. This prevents aging stock from sitting unused until it’s no longer viable.
9. Label and Date All Cement Deliveries
Every delivery of cement should be labeled with the date of manufacture, the type and grade, and the supplier. This information is essential for FIFO rotation, quality tracking, and compliance documentation. Don’t rely on memory or informal systems. Use written labels and a delivery log.
10. Limit Storage Duration (Target: Within 90 Days)
The recommended maximum storage duration for cement is 90 days from the date of manufacture, according to IS 4082 and Cement Sector guidelines. Beyond 90 days, strength loss accelerates and the risk of quality compromise increases significantly. Plan your deliveries to match consumption rates, and never stockpile more cement than you can use within this window.
Following these cement storage and handling best practices consistently will cut the vast majority of spoilage on your construction site.
Bulk Cement Storage and Handling in Silos: Best Practices
Selecting the Right Silo Type (Vertical, Horizontal, Mobile)
Vertical silos are the most common choice for permanent or semi-permanent installations. They offer the highest storage capacity per footprint and work well with pneumatic filling systems. Horizontal silos suit locations with height restrictions, while mobile silos (often trailer-mounted) provide flexibility for projects that relocate or require cement at multiple points on a large site. Choose based on your site layout, cement consumption rate, and how long the silo needs to remain in place. For detailed guidance on selecting the right cement silo for your operation, see our complete silo buying guide.
Silo Moisture and Condensation Control
Moisture is the enemy inside a silo just as much as outside one. Condensation forms when warm, humid air meets cooler silo walls, particularly during temperature swings between day and night. To combat this, maintain the silo’s breather filters in clean condition, ensure all gaskets and seals are intact, and consider installing a desiccant-type vent dryer on the silo’s air intake. SRMPR Cements implemented a warehouse standardization protocol that included controlled-environment storage, raised platforms, and product isolation, resulting in measurable improvements in cement consistency and reduced customer complaints about lumps.
Knowing how to prevent cement from hardening in storage is critical for silo operators, and it starts with moisture control at every entry point.
Silo Loading and Unloading Procedures
Always load cement into a silo through the designated pneumatic fill pipe. Never open the top hatch and pour. The pneumatic system filters the air and prevents moisture ingress. During unloading, operate the aeration pads or fluidization system to ensure even flow and prevent ratholing (where cement channels around a central core of stagnant material). Never leave a silo partially filled for extended periods. More exposed surface area means more condensation, and more spoiled cement.
Preventing Cement Clumping and Blockages in Silos
The problem: A 2023 investigation by Darko Tech documented a recurring issue at a concrete plant: hard lumps forming inside a cement storage silo, restricting flow and contaminating batches.
The root cause: High cement discharge temperatures (up to 110°C) combined with very fine powder content that compacted under pressure in the silo cone. When the cement cooled, residual moisture in the air condensed on the compacted material, triggering localized hydration and lump formation.
The fix: Reducing discharge temperatures at the cement plant, installing vibration pads on the silo cone, and implementing a regular aeration cycle even when the silo wasn’t being actively discharged.
This case is a reminder: skip silo maintenance, and you’ll be the one chipping out the lumps.
How Long Can Cement Last in Storage?
How Long Can Cement Be Stored?
Cement can be stored for up to 3 months under ideal conditions with minimal strength loss. However, the recommended maximum storage duration is 90 days from manufacture. After 3 months, cement loses approximately 20% of its compressive strength; after 12 months, strength loss reaches 40%.
But “ideal conditions” exist in lab manuals, not on actual job sites. Real-world storage often involves some exposure to humidity, temperature fluctuations, and handling stress, all of which accelerate degradation. The 90-day rule is a practical guideline: plan to use cement within 3 months of manufacture, and test any cement that has been stored longer before using it in structural applications.
Cement Strength Loss Over Time
Cement strength deteriorates predictably over time. The following table shows estimated strength loss at key storage intervals, based on IS 4082 data.
| Storage Duration | Estimated Strength Loss | Usability |
|---|---|---|
| Fresh (0 months) | 0% | Full strength |
| 3 months | ~20% | Reduced; test before use |
| 6 months | ~30% | Significant loss; retest mandatory |
| 12 months | ~40% | Not recommended for structural use |
| 5 years | 50%+ | Unusable for construction |
Source: IS 4082 / The Constructor
How to Test If Stored Cement Is Still Usable
Field test — the finger rub test: Take a small sample of cement and rub it between your fingers. If it feels smooth like flour and has no grit or lumps, the cement is likely in usable condition. If you feel lumps that don’t break apart with light finger pressure, the cement has begun to hydrate and is compromised. Lumps that crumble easily when squeezed may still be usable after sifting, but proceed with caution.
Lab test — compressive strength test per ASTM C109: For any structural application, laboratory testing is non-negotiable. ASTM cement and concrete testing standards outline the standard test method for compressive strength of hydraulic cement mortar. A lab will prepare mortar cubes from the stored cement, cure them, and test their compressive strength against the cement’s rated strength. If the result falls below the specified minimum, the cement must be rejected for structural use.
Reconditioning Aged Cement (Vibratory Grinding)
Cement that has formed small, friable lumps can sometimes be reconditioned by passing it through a vibratory sieve or grinding mill. This breaks down the lumps and restores the powder form, but it does not reverse the chemical hydration that has already occurred. Reconditioned cement will have lower strength than fresh cement of the same age. Use reconditioned cement only for non-structural applications, and always retest before use.
Safe Cement Handling Procedures
Lifting and Moving Cement Bags Safely (Ergonomics)
A standard 50 kg (94 lb) cement bag is well above the safe lifting limit for a single person under most occupational health guidelines. Use two-person lifts for any bag over 25 kg. Back straight, knees bent, bag close to your body. Your lower back will thank you at the end of the shift. Avoid twisting while carrying a load. Pivot with your feet instead. For repetitive bag handling, use mechanical aids like bag lifters, conveyor belts, or vacuum lifters to reduce strain injuries.
Transporting Cement on Site (Vehicles, Forklifts, Hand Trucks)
For moving more than a few bags, use appropriate equipment. Forklifts with flat pallets are the most efficient method for bulk movement. Hand trucks and dollies work well for smaller quantities. Ensure all transport routes are clear, level, and free of standing water. Never drag cement bags. Dragging damages the packaging and creates tears that allow moisture ingress.
Loading and Unloading Bulk Cement Safely
Bulk cement transfer via pneumatic tanker is the standard method for silo filling. Before starting a transfer, verify that the silo is not overfilled, all valves are correctly positioned, and the pressure relief system is functional. Monitor the fill level throughout the process. Overfilling can damage the silo’s filter system and create dangerous pressure buildup. Personnel should stay clear of the fill line and wear appropriate PPE during transfer.
Preventing Bag Damage and Spillage
Bag damage is a double problem: you lose material, and the torn bag exposes remaining cement to moisture. Stack bags carefully, never throw or drop them. When cutting bags for use, use a clean blade and pour. Don’t rip the bag open. Collect all spilled cement promptly; it cannot be recovered for structural use once it has contacted the ground.
Cement Handling Safety and PPE Requirements
Health Hazards of Cement Dust (Dermatitis, Respiratory Issues, Chemical Burns)
Cement does more than bruise your shins. It’s a chemical hazard. Wet cement is highly alkaline (pH 12–13) and can cause severe chemical burns with prolonged skin contact. Dry cement dust irritates the respiratory tract, and chronic exposure can lead to occupational asthma and silicosis. Cement dermatitis is one of the most commonly reported occupational skin conditions in construction, according to the HSE guidance on cement health risks and safety. The dust also contains trace amounts of hexavalent chromium, a known skin sensitizer and carcinogen.
Required PPE for Cement Handling (Gloves, Masks, Goggles, Protective Clothing)
No exceptions. Every worker handling cement, bagged or bulk, needs the following:
- Waterproof gloves (nitrile or butyl rubber, not cotton)
- Safety goggles or a full face shield for bulk transfer operations
- N95 respirator or P100 mask when dust is present
- Long-sleeved shirt and full-length trousers (no exposed skin)
- Waterproof boots with no gaps where cement can enter
Workers must wash hands and face after handling cement and before eating, drinking, or smoking. Contaminated clothing should be washed separately from other laundry.
OSHA Regulations for Cement Storage and Handling (29 CFR 1926.702)
OSHA 29 CFR 1926.702 specifically addresses bulk cement storage requirements on construction sites. Key provisions include:
- Bulk cement storage facilities must be designed to prevent moisture contamination
- Transfer systems must be enclosed or have dust collection systems
- Employers must provide appropriate PPE and training to all workers handling cement
Non-compliance can result in citations, fines, and work stoppages. An OSHA citation for cement storage violations can run $15,625 per instance as of 2025, and that’s before you factor in project delays.
For comprehensive construction site safety protocols beyond cement handling, see our complete safety guide.
First Aid for Cement Exposure (Skin Contact, Eye Contact, Inhalation)
- Skin contact: Remove contaminated clothing immediately. Wash the affected area with copious clean water for at least 15 minutes. If burns or irritation develop, seek medical attention. Do not apply salves or ointments without medical advice.
- Eye contact: Flush eyes with clean water for at least 15 minutes, holding eyelids open. Seek immediate medical attention. Cement in the eyes can cause permanent damage.
- Inhalation: Move the person to fresh air. If breathing is difficult, administer oxygen if trained to do so and seek medical attention. Do not let the person return to the contaminated area until the dust has settled and appropriate controls are in place.
Cement Storage and Handling in Challenging Conditions
Cold Weather and Winter Storage
Condensation, not the cold, is the real threat in freezing temperatures. When cold cement bags are moved into a warmer area, moisture condenses on the bag surfaces and can penetrate the packaging. Store cement in a temperature-stable area whenever possible. If cement must be stored in cold conditions, ensure the storage area is dry and well-sealed, and allow bags to acclimatize gradually before opening. Never use cement that has visible frost or ice crystals.
Hot and Humid Climate Storage
In tropical and subtropical regions, humidity is a 24/7 problem. If you’re working in the Gulf Coast or Southeast Asia, you already know this. Cement storage areas should be air-conditioned or dehumidified if possible. At minimum, use moisture barrier sheeting on all surfaces: floors, walls, and over the top of stacks. Increase the frequency of stock inspections. In hot, humid climates, cement can begin degrading noticeably within weeks rather than months. Consider more frequent, smaller deliveries rather than large stockpiles.
Temporary and Outdoor Storage (When No Enclosed Space Is Available)
Sometimes, no enclosed storage is available, particularly on remote or early-phase construction sites. In these situations, raise the cement on platforms at least 300mm above ground level (higher than the standard 150–200mm), cover stacks with overlapping waterproof tarpaulin on all sides, and secure the tarpaulin against wind. Create a slight slope on the tarpaulin so water runs off rather than pooling. Limit outdoor storage to 30 days maximum. The risk of spoilage increases dramatically in exposed conditions.
What OSHA, ASTM, and IS 4082 Actually Require for Cement Storage
OSHA 29 CFR 1926.702 — Bulk Cement Storage
This regulation establishes requirements for bulk cement storage on construction sites in the United States. Key provisions cover the design and maintenance of storage facilities, dust control during transfer operations, and worker safety requirements. Read the full text of OSHA 29 CFR 1926.702 bulk cement storage requirements. All construction sites using bulk cement must comply with these standards, and failure to do so can result in OSHA citations and penalties.
ASTM C511 — Storage of Cement Samples
ASTM C511 specifies the requirements for containers used to store cement samples prior to testing. While this standard is primarily aimed at laboratory and quality-control settings, its principles apply to field storage as well: containers must be airtight and moisture-proof, samples must be clearly labeled, and storage conditions must be documented. Following ASTM C511 ensures that test results accurately reflect the cement’s condition at the time of sampling, not artifacts of poor sample storage.
IS 4082 — Stacking and Storage of Construction Materials (India)
IS 4082 provides comprehensive guidelines for the stacking and storage of construction materials, including detailed specifications for cement. It covers ground clearance (minimum 150mm), stacking height (maximum 10 bags), clearance from walls (minimum 300mm), ventilation requirements, and the 90-day storage duration guideline. While this is an Indian standard, its provisions are widely referenced in international construction practice and align closely with OSHA and HSE recommendations.
HSE Guidelines for Cement Handling (UK)
The UK Health and Safety Executive (HSE) publishes guidance on cement health and safety under the Construction (Design and Management) Regulations. The HSE focuses heavily on the health hazards of cement, particularly dermatitis, chemical burns from wet cement, and respiratory risks from dust. Employers in the UK are required to perform COSHH (Control of Substances Hazardous to Health) risk assessments for cement handling and to provide appropriate PPE, training, and welfare facilities (including washing stations).
Dust, Spills, and Waste: The Environmental Side of Cement Storage
Dust Control and Air Quality Management
Cement dust is a significant environmental and health concern. During loading, unloading, and transfer operations, implement dust suppression measures: enclosed transfer lines, filter systems on silo vents, and water mist systems in bag-handling areas. Monitor airborne particulate levels, particularly near site boundaries, to ensure compliance with local air quality regulations.
Spill Prevention and Cleanup
Preventing spills is far easier and cheaper than cleaning them up. Store cement on impervious surfaces that can be easily cleaned. Keep spill kits (containing absorbent material, shovels, and disposal bags) near storage areas. Any spilled cement should be collected promptly and disposed of according to local environmental regulations. Never wash cement into storm drains or waterways. The alkaline runoff can harm aquatic ecosystems.
Sustainable Cement Storage Practices
Reducing cement waste through proper storage is itself a sustainability practice. Every ton of cement that doesn’t spoil is a ton that doesn’t need to be manufactured. Cement production accounts for approximately 8% of global CO₂ emissions. By extending cement’s usable life through proper storage and handling, you reduce both material waste and the embodied carbon footprint of your project. Bulk silo storage, with its lower spoilage rates and reduced packaging waste, is the more sustainable choice wherever project scale permits.
For storage best practices for other construction materials to reduce waste across your entire materials inventory, see our building materials storage guide.
Cement Storage and Handling Checklist
Use this checklist on every project to ensure your cement storage and handling practices meet the standard. For a downloadable PDF version you can print and post on site,
Pre-Delivery
- Storage area is dry, enclosed, and weatherproof
- Raised platforms or pallets in place (minimum 150–200mm elevation)
- Storage zones separated for different cement types and grades
- FIFO rotation system established and documented
During Storage
- Bags stacked no higher than 10 per pile with cross-stacking pattern
- Minimum 300mm clearance between stacks and from walls
- All stacks covered with waterproof tarpaulin
- All deliveries labeled with manufacture date, type, and supplier
- Storage area inspected weekly for leaks, moisture, and pest damage
- No cement stored beyond 90 days without quality testing
Pre-Use Inspection
- Finger rub test performed — no lumps or grit
- Packaging intact — no tears, water stains, or hardened areas
- Storage duration confirmed — within 90-day window
- For structural use: ASTM C109 lab test results on file
Handling
- Workers wearing required PPE (gloves, goggles, mask, boots, long sleeves)
- Two-person lifts for bags over 25 kg
- Mechanical aids available for repetitive or heavy lifting
- Spill kits positioned near storage and handling areas
- Washing facilities accessible for all workers handling cement
Frequently Asked Questions About Cement Storage and Handling
How long can cement be stored before it goes bad?
Cement should be used within 90 days of manufacture. Under ideal storage conditions, it retains most of its strength for up to 3 months, but loses approximately 20% of compressive strength by month 3 and 40% by month 12. Always test cement that has exceeded 90 days in storage before using it in structural applications.
How should cement bags be stored on a construction site?
Store cement bags in a dry, enclosed shed on raised platforms at least 150–200mm above floor level. Stack no more than 10 bags high in a cross-stacking pattern with 300mm clearance from walls. Cover stacks with waterproof tarpaulin and follow FIFO rotation to use older stock first.
What are the OSHA requirements for cement storage and handling?
OSHA 29 CFR 1926.702 requires that bulk cement storage facilities be designed to prevent moisture contamination, transfer systems be enclosed or equipped with dust collection, and employers provide appropriate PPE and training to all workers handling cement.
How do you prevent cement from hardening in storage?
Prevent cement from hardening by storing it in a dry, enclosed area away from moisture. Elevate bags off the ground, cover with waterproof tarpaulin, maintain ventilation, and follow FIFO rotation. For silos, maintain breather filters, ensure gaskets are intact, and use desiccant-type vent dryers.
Can old cement still be used?
Cement stored beyond 90 days can sometimes be used after testing. Perform a finger rub field test: if the cement feels smooth with no hard lumps, it may be usable. For structural applications, ASTM C109 lab testing is required. Cement with more than 40% strength loss (typically 12+ months old) should not be used structurally.
Conclusion
The rules for cement storage are simple. Following them every single day, that’s the hard part.
The ten best practices outlined here, from dry, enclosed storage and 150–200mm ground elevation to FIFO rotation and the 90-day usage window, are proven, standards-backed methods that work. Bulk silo storage cuts your per-ton cost by 50% and reduces spoilage to under 1%. OSHA, ASTM, and IS 4082 compliance isn’t just about avoiding citations. It’s about protecting your workers from chemical burns, respiratory damage, and the long-term health consequences of cement dust exposure.
