Concreting is the most important step that determines the solidity and longevity of the project. From residential houses to modern high-rise buildings, concrete plays the role of an irreplaceable "backbone", this stage requires technique, careful preparation and strict compliance with standards. In this article, XHOME Saigon helps you understand what concrete is, the process and standards of professional concrete pouring according to construction techniques.
1. Understand concrete correctly before pouring
Before going into the technical details of pouring concrete, it is essential to have a solid understanding of the basic knowledge of this material.
1.1. What is concrete?
Concrete is a type of artificial stone, formed by mixing main ingredients including:
- Adhesive: Cement (most commonly Portland cement).
- Materials: Sand (fine aggregate), crushed stone or gravel (coarse aggregate).
- Water: Activates the hydration reaction of cement, helping the concrete to solidify.
- Additives (if any): Improve some properties of concrete (waterproofing, super plasticity, fast/slow setting…).
These ingredients are mixed in a certain ratio (concrete mix) to create fresh concrete mixture. After hardening, concrete has very good compressive strength.
1.2. The importance of pouring concrete properly
Proper concrete pouring technique directly affects the rough part of the house:
- Strength and bearing capacity: Ensure the project meets the design grade and can withstand the expected load.
- Durability and longevity: Helps concrete resist environmental impacts, limit cracking and damage, thereby prolonging the life of the project.
- Aesthetics: Concrete surface is flat, beautiful, no holes or cracks.
- Construction safety: Prevent unfortunate incidents due to poor concrete quality.
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2. Prepare carefully before pouring concrete
Preparation plays a key role, largely determining the success of the concrete pouring process. Poor preparation can lead to unpredictable consequences.
2.1. Construction site preparation
- Release and clean: Clear away obstacles, trash, and weeds. Make sure the surface is dry and free of standing water.
- Level and compact the foundation (if pouring floor or foundation): Create a stable foundation to prevent subsidence. Can spread a layer of gravel or sand.
- Check temporary drainage system: Ensure good drainage to avoid affecting newly poured concrete.
- Safe: Barrier the area, prepare signs and safe passageways.
2.2. Formwork installation
Formwork is a mold for casting and shaping fresh concrete. Technical requirements:
- Correct shape and size: According to the design of the structure.
- Stability and rigidity: Withstand the pressure of fresh concrete and construction loads.
- Airtight: Avoid loss of cement water, ensure smooth concrete surface.
- Easy to install: Convenient for construction and reuse.
- Cleanliness: Non-stick, grease-free. Can be coated with non-stick coating.
- Acceptance: Carefully check the core, size and strength before pouring concrete.
2.3. Arrangement and acceptance of steel reinforcement
Concrete is good in compression but poor in tension. Steel reinforcement is used to increase the tensile strength of concrete. structure reinforced concrete
- Quality and variety: True to design, stainless steel, no dirt.
- Exact layout: Correct position, quantity, diameter, distance according to drawing.
- Strong Link: The steel bars are securely tied or welded together.
- Concrete protection layer: Ensure the thickness of the concrete layer protecting the steel reinforcement by using the correct spacers.
- Acceptance: Check and accept the entire reinforcement system before pouring concrete.
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3. Expert standard concrete mixing and pouring techniques
Once the preparation work is complete, the concrete mixing and pouring stage will begin.
3.1. Concrete mixing method
- Manual mixing: Use shovel, hoe or small mixer. Applicable for small volume, small projects. Difficult to control uniform quality.
- Machine mixing at site: Using specialized concrete mixer ensures uniformity and higher productivity.
- Fresh concrete (commercial concrete): Premixed at industrial mixing stations according to standard mix proportions, transported by specialized tank trucks. This is the optimal solution for large projects requiring high quality, uniformity and fast progress. XHOME Saigon recommends this method to ensure the best quality.
3.2. Concrete pouring method
The choice of pouring method depends on location, scale and construction conditions.
- Pour directly from the tanker chute: Applicable to low, accessible locations (foundation, ground floor).
- Using wheelbarrow, crane + dump truck: For more complex positions, moderate volume.
- Concrete pumping (boom pump or stationary pump): Effective solution for pouring concrete in high, remote, and hard-to-reach locations (columns, beams, high-rise floors). Ensures continuity and fast pouring speed.
- Note when pouring:
- Pour concrete continuously, avoiding unwanted joints.
- The free fall height of concrete should not exceed 1.5m to avoid segregation.
- Pour in layers, the thickness of each layer depends on the type of structure and compaction method.
3.3. Equipment and tools to support concrete pouring
- Concrete mixer (if mixing on site).
- Transport vehicles (tank trucks, wheelbarrows).
- Concrete pump.
- Concrete vibrating machine (ramming machine, plate vibrating machine, ruler vibrating machine).
- Shovel, trowel, level.
- Labor protection equipment.
4. Compacting and finishing concrete surfaces – Enhances durability and aesthetics
This is an indispensable step to ensure concrete quality.
4.1. Importance of concrete compaction
- Remove air bubbles: Helps concrete become denser and reduces voids.
- Increase intensity: Dense concrete will have higher tensile strength.
- Increased durability: Reduce water permeability, increase corrosion resistance.
- Good links: Helps concrete adhere better to steel bars and old concrete layers (if any).
4.2. Types of compactors and compaction techniques
- Dam: Most commonly, insert the awl into the concrete block. Used for columns, beams, foundations, walls.
- Table top dresser (face dresser): Used for floor, roof and road surfaces.
- Dress size: Combine leveling and lightly compacting the surface.
- Compaction technique:
- Tamp thoroughly and evenly, without missing any spots.
- Tamp just enough, until the surface has a layer of cement and no more air bubbles.
- Avoid compacting for too long to avoid stratification.
- The rammer movement must ensure that the affected areas of the rammer positions overlap.
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4.3. Concrete surface finishing
After compacting, smooth the surface with a ruler. Depending on the requirements, the surface can be smoothed with a trowel or a floor trowel to create a flat, smooth and aesthetic surface. Do not smooth the surface too early when the concrete still has a lot of water on the surface.
5. Proper Concrete Curing – The “Secret” to Optimal Concrete Strength
Concrete needs time and proper conditions to develop strength. Curing is the process of controlling the temperature and humidity of the concrete after it is poured.
5.1. Why is maintenance important?
- Ensuring cement hydration process: Helps cement react completely with water, creating products that increase strength.
- Prevent shrinkage cracking: Keeping the concrete moist prevents it from losing water too quickly, minimizing surface cracking.
- Achieve design strength: Well cured concrete will reach and possibly exceed its design strength.
5.2. Effective concrete maintenance methods
- Keep the formwork intact: Formwork helps keep concrete naturally moist.
- Watering: Spray water evenly onto the concrete surface, keeping the surface moist.
- Surface coating: Use damp sacks, plastic tarps, straw, etc. to cover, keep moist and avoid harsh sunlight.
- Soak in water: Apply to floor and roof structures by building water-proof edges.
- Use of curing compound: Spray a thin film on the surface to prevent water evaporation.
5.3. Concrete curing time
- The minimum curing time is usually 7 days. However, for best strength development, 28 days is recommended.
- The first few days after pouring concrete are the most important, special attention must be paid to keeping it constantly moist.
- Comply with TCVN 8828:2011 on natural moisture curing requirements for concrete.
6. Concrete quality control at construction site – Ensuring safety and sustainability
Quality control is a continuous process, from input materials to concrete hardening.
6.1. Input material inspection
- Cement: Correct type, within expiry date, properly stored.
- Aggregates (sand, stone): Clean, free of impurities, suitable size. Comply with TCVN 7570:2006.
- Water: Clean, not contaminated with alum, salt, or grease. Complies with TCVN 4506:1987.
6.2. Slump test of fresh concrete
- Purpose: Evaluate the workability (flowability, plasticity) of concrete mixtures.
- How to conduct: According to TCVN 3106:2022. Slump must be suitable for the type of structure and construction method.
6.3. Sampling and testing of compressive strength of concrete
- Purpose: Determine actual concrete grade, evaluate bearing capacity.
- How to conduct: Take samples at the site according to TCVN 3105:2022, cast samples and maintain them under standard conditions. Compress samples after 7 days and 28 days (or according to design requirements) according to TCVN 3118:2022.
- The results must meet design requirements and TCVN 5574:2012 standards.
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6.4. Compliance with technical standards
The concrete pouring and acceptance process must strictly comply with TCVN 4453:1995 (Monolithic concrete and reinforced concrete structures - Construction and acceptance regulations) and other relevant standards.
See more: What is MEP?
7. Common problems when pouring concrete and how to handle them effectively
During construction, some problems may occur. Timely recognition and handling are very important.
- Concrete Cracks:
- Reason: Shrinkage due to rapid water loss, temperature difference, premature loading, incorrect mix design.
- Remedy/Prevention: Proper maintenance, control of W/X ratio, use of additives, creation of expansion joints.
- Stratification and dewatering:
- Reason: The mixture is too thin (too much water), too compacted, or poured from a great height.
- Remedy/Prevention: Reasonable mix design, slump control, proper pouring, adequate compaction.
- Honeycomb:
- Reason: Not compacted properly, formwork not tight, concrete too dry.
- Remedy/Prevention: Tamp carefully, check the formwork, ensure appropriate slump. If there are holes, chisel out the weak part and patch it with high-grade cement mortar or specialized materials.
- Cold circuit:
- Reason: Too long a gap between concrete pours.
- Remedy/Prevention: Plan for continuous pouring. If a stop joint is required, the old layer surface must be treated (cleaned, roughened, and watered with cement) before pouring the new layer.
8. Labor safety during concrete pouring – top priority
Labor safety is an indispensable factor in every stage of construction. In addition, construction works will always have construction supervision
- Regulatory compliance: According to QCVN 18:2021/BXD and safety regulations of TCVN 4453:1995.
- Personal protective equipment (PPE): Helmets, gloves, boots, goggles, masks for workers.
- Equipment safety: Check machinery and equipment (mixers, pumps, scaffolding, formwork) before use.
- Work area safety: Barriers, signs, adequate lighting (if working at night), ensure safe passage.
- Safety training: Workers must be trained in safety measures when pouring concrete.
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9. Advanced concrete technology trends – Towards a sustainable future
The concrete industry is constantly evolving with many new technologies:
- Self-compacting concrete (SCC): Self-flowing, filling the mold without vibrating, suitable for complex structures, dense reinforcement.
- Fiber Reinforced Concrete (FRC): Enhance tensile, bending, crack and impact resistance thanks to fibers (steel, polymer, glass, etc.).
- Green and sustainable concrete: Using recycled materials (fly ash, blast furnace slag), reducing CO2 emissions, environmentally friendly.
These technologies are gradually being applied, promising to bring more efficient, sustainable and intelligent construction solutions.
See more: Building finished house
Conclusion
Pouring concrete is an art and science that requires meticulousness, professional knowledge and practical experience. From preparation, material selection, construction techniques, compaction, finishing to maintenance and quality control, each step contributes to the success of the entire structure. Compliance with technical standards and safety procedures is a prerequisite to creating works that are not only aesthetically beautiful but also durable over time.
At XHOME Saigon, we are proud to have a team of skilled engineers, architects and workers with in-depth knowledge of concrete technology. We are committed to providing optimal concrete pouring solutions, ensuring superior quality for all of our customers' projects.
You are having house plan, construction and need in-depth advice on concrete pouring solutions for your project? Contact XHOME Saigon immediately for dedicated and professional support!
- Hotline: Phone: 0899 199 786
- Email: info@xhomesg.com.vn
- Website: xhomesg.com.vn
- Address: 1st Floor, Orient Building, 331 Ben Van Don, Ward 1, District 4, HCMC
