Name: concrete surface finishing steps
Uploaded: 2024-11-07T14:48:35.000Z
Duration: 1 min 18 s
Channel: JoVE

배치된 콘크리트를 통합한 후 여분의 재료를 표면에서 제거하고 스크리드를 사용하여 거푸집 공사 상단으로 플러시합니다.
그 후, 불 플로트 또는 다비를 사용하여 콘크리트 표면의 높은 지점을 낮추고, 낮은 지점을 채우고, 블리드 물이 표면으로 올라오기 전에 큰 골재를 콘크리트에 묻습니다.
표면의 블리드 워터로 인한 광택이 증발 시 사라지면 최종 마감 준비가 된 것입니다. 이것은 콘크리트의 가장자리를 둥글게 만드는 것과 관련된 가장자리로 시작됩니다.
그 다음에는 접합이 이어지며, 여기서 제어, 격리 및 건설 접합이 구조에 전략적으로 배치됩니다.
다음으로, 휴대용 플로트 또는 파워 플로트를 사용하여 테두리 및 접합으로 인한 표면 결함을 제거하고, 골재를 콘크리트 내부에 약간 삽입하고, 과도한 물을 제거하여 표면을 열린 상태로 유지합니다.
마지막으로, 완성 된 표면은 흙손으로 질감을 만들어 단단하고 매끄러운 표면을 만들거나, 빗자루로 거칠고 미끄럼 방지를하거나, 상단의 여분의 시멘트 페이스트를 씻어 노출 된 모양을 만들거나, 칸막이 스트립을 삽입하여 패턴화 할 수 있습니다.

콘크리트 마무리

콘크리트 마감은 콘크리트를 놓고 굳힌 직후에 시작됩니다. 첫 번째 단계인 스크리딩은 콘크리트 표면을 평평하게 하는 것으로, 과도한 재료를 제거하여 거푸집의 윗부분과 평평하게 합니다. 그 후, 불 플로트 또는 다비를 사용하여 표면을 더욱 매끄럽게 하고, 높은 지점을 효과적으로 낮추고, 낮은 부분을 채우고, 더 큰 골재 입자가 콘크리트에 묻히도록 합니다. 이러한 준비는 블리드 워터가 나타나기 전에 중요합니다. 블리드 워터가 있으면 스케일링과 먼지가 발생할 수 있기 때문입니다.


 표면에서 물이 새지 않으면 콘크리트는 최종 마감을 위한 준비가 됩니다. 여기에는 쪼개짐을 방지하기 위해 슬래브의 가장자리를 둥글게 다듬는 에징, 콘크리트의 자연스러운 움직임을 관리하고 보기 흉한 균열을 방지하기 위해 제어, 격리 및 시공 조인트를 만드는 조인트, 그리고 플로팅이 포함됩니다. 후자는 이전 단계에서 남은 모든 불완전성을 매끄럽게 하고, 표면 아래에 골재를 약간 묻고, 최종 마감을 위해 표면에 모르타르를 압축하면서 과도한 수분이 빠져나갈 수 있도록 합니다.


 콘크리트의 최종적인 모양과 질감은 표면을 매끄럽고 단단하게 하는 흙손질, 표면을 거칠게 하는 브러밍과 같은 다양한 기술을 통해 달성됩니다. 또한, 패턴이나 노출된 골재 마감을 적용하여 장식 효과를 낼 수 있습니다.

배치된 콘크리트를 통합한 후 여분의 재료를 표면에서 제거하고 스크리드를 사용하여 거푸집 공사 상단으로 플러시합니다.
그후에...

Education

교육

JoVE Core

Civil Engineering

토목공학

Unit 1

제1단원

Mixing, Placing and Curing Concrete 

콘크리트의 배합, 타설 및 양생

KEY TERMS AND CONCEPTS

주요 용어 및 개념

Finishing Concrete

concrete surface finishing steps

Concrete surface finishing begins right after the concrete has been placed and consolidated. The first step is screeding, which levels the surface by removing extra material until it is even with the top of the formwork. A screed is a straight edge used for this leveling step.

After screeding, a bull float or darby is used to smooth the surface further. These tools help lower high spots, fill low areas, and push larger aggregate particles deeper into the concrete. This preparation should happen before bleed water appears. Bleed water is the water that rises to the top of fresh concrete, and if it is handled too soon, it can lead to scaling and dusting.

When the surface is free of bleed water, the slab is ready for final finishing. Edging rounds the slab edges so they are less likely to chip. Jointing creates control, isolation, and construction joints. These joints help manage the concrete’s natural movement and reduce unsightly cracking.

Floating is another finishing step that smooths small imperfections left by earlier work. It also slightly embeds the aggregate below the surface and compacts the mortar at the top. This still allows excess moisture to escape before the final surface treatment is applied.

The last stage shapes the concrete’s final look and texture. Troweling smooths and hardens the surface, while brooming makes it rougher. Patterns or exposed aggregate finishes can also be added for decoration.

Concrete Surface Finishing Steps

mixing concrete

Concrete Mixer Types and Capacity

Concrete mixing creates a uniform blend of cement, aggregates, and paste. The goal is to coat the aggregates evenly with cement paste. Mixers used for this job are usually grouped into two main types: batch mixers and continuous mixers. Batch mixers handle one load at a time. They mix the materials thoroughly, discharge the batch, and then receive the next one. Continuous mixers work differently. They take in a steady flow of ingredients, mix them at a constant rate, and discharge the concrete...

mixing time

Concrete Mixer Charging and Timing

Concrete mixer charging and timing are key to making a uniform concrete mix with the needed strength. Mixing begins only after all ingredients are inside the mixer. The usual charging order starts with 10% of the water, then the solid materials are added steadily, followed by 80% of the water. The last portion of water is added later, within the first quarter of the total mixing period. The minimum mixing time depends on mixer capacity. Mixers with up to 1 cubic yard of capacity need at least...

ready mixed concrete

How Ready-Mixed Concrete Is Delivered

Ready-mixed concrete is prepared at a centralized plant and then delivered by truck to a construction site. It arrives ready for placement, which makes it different from concrete mixed entirely on site. Ready-mixed concrete includes three main forms: central-mixed, truck-mixed, and shrink-mixed. Central-mixed concrete is fully mixed at the plant and carried to the site in agitator trucks. These trucks rotate at 2 to 6 rpm, which helps keep the concrete in motion during transport. Truck-mixed...

pumped concrete

Concrete Pumping for Hard-to-Reach Sites

Concrete pumping moves large amounts of concrete through pipes to places that are hard to reach. It is used for sites such as deep foundation pits and other inaccessible locations. The system includes a hopper, a pump, and pipelines that carry the concrete to the placement point. Direct-acting pumps use a piston to move the concrete. Concrete enters the pump through the inlet valve by gravity and by suction created as the piston moves. The forward movement of the piston then pushes the...

placing concrete

Concrete Placement Methods and Compaction

Concrete placement methods focus on keeping the mix in a uniform shape and position. The concrete is placed as close as possible to its final location to reduce segregation, which is the separation of ingredients. It is then fully compacted to remove trapped air. The next layer is added while the layer below is still plastic, or soft enough to shape. The rate of placing and compacting concrete is kept equal. Concrete is laid in uniform layers, and hand shoveling is avoided. Moving concrete...

vibrating concrete

Concrete Compaction with Vibrators

Concrete compaction with vibrators helps newly poured concrete settle inside formwork and around reinforcement bars. The goal is to remove trapped air pockets and create a dense concrete mass. Mechanical vibration is a key part of that process. One common method uses an internal vibrator, also called a poker vibrator or immersion vibrator. It is quickly inserted through the full depth of the fresh concrete and slightly into the layer below, which is still in a plastic state. The vibrator is...

shotcrete

Shotcrete for Vertical and Overhead Surfaces

Shotcrete is a concrete spraying method used on vertical and overhead surfaces. It uses mortar or small aggregate concrete with a high cement content. The material is sprayed at high velocity, and the impact helps compact it so it can cling without sagging. Builders place shotcrete in layers until it reaches about 4 inches thick. The quality depends strongly on the operator’s skill in managing the nozzle. Careful nozzle control helps the material land evenly and build up properly. Shotcrete...

preplaced aggregate concrete

Concrete Placement for Tight Spaces

Preplaced aggregate concrete is used when a construction site is hard to reach. The process starts by wetting gap-graded coarse aggregates. This helps remove dirt from the stones. The aggregates are then placed in the form and compacted. Next, a mortar mix is pumped under pressure through slotted pipes to fill the spaces between the aggregates. The mortar usually contains Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan reduces bleeding and segregation and...

finishing concrete

Concrete surface finishing begins right after the concrete has been placed and consolidated. The first step is screeding, which levels the surface by removing extra material until it is even with the top of the formwork. A screed is a straight edge used for this leveling step. After screeding, a bull float or darby is used to smooth the surface further. These tools help lower high spots, fill low areas, and push larger aggregate particles deeper into the concrete. This preparation should...

curing of concrete

How Curing Improves Concrete Strength

Curing helps concrete gain strength after it has set. It keeps the concrete moist and at the right temperature so cement hydration can continue. Hydration is the process where cement reacts with water in the water-filled capillary pores and forms the products that fill spaces in the paste. Dry air can interrupt this process by pulling water from the concrete surface. Concrete with a water-cement ratio below 0.5 can also lose water through self-desiccation, which means internal water is used up...

curing methods

Concrete Curing for Moisture Retention

Concrete curing for moisture retention helps fresh concrete keep the water it needs as it hardens. For members with a small surface-to-volume ratio, the forms are often oiled and moistened before the concrete is placed. These forms may stay in place for a long time to reduce moisture loss. If the form material can be wetted, it can also be kept damp. When forms are removed early, the concrete member is moistened and then covered with polythene sheets. Large horizontal concrete surfaces in dry...

accelerated curing of concrete

How Concrete Gains Strength Faster

Concrete can gain strength faster when heat and extra moisture speed up cement hydration. This faster hydration helps the concrete build early strength sooner than normal curing. The process is used when quicker hardening is needed after casting. One common method is steam curing. Concrete products may move through a chamber on a conveyor belt, or they may be encased in plastic so steam at atmospheric pressure can circulate around them. Steam curing starts with moist curing for about 3 to 5...

key terms and concepts

Learn the steps of concrete surface finishing, from screeding and floating to edging, jointing, troweling, and brooming for different final textures.

Concrete Surface Finishing Steps | JoVE K12

JoVE Core Civil Engineering offers a foundational exploration of essential construction materials such as bricks, stones, steel, wood, and concrete, along with fluid mechanics topics like flow over immersed bodies, open channel flow, and dimensional modeling. It also covers key surveying concepts, including leveling, traverse adjustments, curve design, topographic mapping, and geospatial technologies (GPS & GIS). Science-in-action videos showcase laboratory research on materials, fluids, and surveying practices in real-world engineering systems.

civil engineering

Concrete Surface Finishing Steps

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