Name: concrete pavement joint types and functions
Uploaded: 2025-06-13T10:43:57.000Z
Duration: 1 min 28 s
Channel: JoVE

콘크리트 슬래브를 사용하여 시공하기 위해 기존 일반 콘크리트 포장의 확장이 제안되어 포장 균열을 최소화합니다.
포장 엔지니어는 포장 균열을 제어하기 위해 시공, 확장, 격리 및 수축 접합을 제공하기로 결정합니다.
시공 조인트는 새 슬래브에서 가능한 모든 움직임을 허용하기 위해 새 슬래브와 기존 슬래브 사이에 제공되는 틈입니다. 콘크리트에 박힌 은못 막대는 인접한 슬래브를 함께 묶습니다.
팽창 이음매는 콘크리트의 열팽창을 허용하기 위해 인접한 슬래브 사이에 제공되는 틈입니다.
그 건축에는 포장의 가로 방향으로 다웰 바를 일렬로 배치하고 바 위에 콘크리트를 붓는 것이 포함됩니다.
남은 틈새는 압축성 필러와 실란트로 채워집니다.
격리 조인트는 포장이 맨홀을 만나는 곳에 제공됩니다. 압축성 물질로 채워진 맨홀 주위의 반 인치 너비의 조인트가 격리 조인트를 형성합니다.
마지막으로, 수축 조인트는 교통 흐름 방향에 수직으로 향하는 최근에 경화된 콘크리트 포장에 홈을 톱질하여 제공됩니다.
이는 콘크리트가 수축하는 동안 균열 형성을 국소화하고 제어하는 데 도움이 됩니다.

설계 사례: 콘크리트 포장의 조인트

콘크리트 포장 조인트는 포장의 균열이 발생하는 위치와 방법을 제어하여 포장의 구조적 무결성과 수명을 유지하는 데 필수적입니다. 이러한 조인트는 수축 또는 제어 조인트, 건설 조인트, 격리 조인트 및 팽창 조인트와 같은 기능에 따라 분류할 수 있습니다.


 수축 조인트는 일반적으로 콘크리트가 굳은 직후에 홈을 톱질하여 형성됩니다. 이렇게 하면 약화된 수직 평면이 생성되어 콘크리트 슬래브 전체에 무작위로 균열이 생기지 않고 이 미리 정해진 위치에 균열이 생기도록 의도적으로 촉진합니다.


 격리 조인트는 콘크리트 포장이 다른 표면이나 도로 교차로 또는 맨홀과 같은 공공 시설 고정물과 만나는 곳에 사용됩니다. 이러한 조인트에는 조인트의 전체 깊이를 채우는 압축성 재료가 포함되어 있어 인접한 구조물이나 표면이 포장과 독립적으로 움직일 수 있습니다.


 건설 조인트는 신선한 콘크리트가 굳은 콘크리트와 만나는 곳에서 발생하며, 종종 하루 포장이 끝날 때 볼 수 있습니다. 이러한 조인트는 포장의 다른 섹션 간의 전환을 관리하고 섹션 사이에 다웰 막대 또는 타이 바를 내장합니다.


 팽창 조인트는 콘크리트 슬래브의 잠재적인 팽창을 수용하기 위해 사용됩니다. 이러한 조인트는 조인트 박리 또는 구조적 폭발로 이어질 수 있는 높은 압축력의 발생을 방지하는 데 중요합니다. 일반적으로 조인트 방향으로 주로 이동을 용이하게 하는 다웰 또는 타이 바와 같은 하중 전달 장치가 포함됩니다. 일반적으로 조인트는 필러 재료와 실런트를 사용하여 채워집니다.

콘크리트 슬래브를 사용하여 시공하기 위해 기존 일반 콘크리트 포장의 확장이 제안되어 포장 균열을 최소화합니다.
포장 도로 ...

design-example-joints-in-concrete-pavements

Education

교육

JoVE Core

Civil Engineering

토목공학

Unit 1

제1단원

Design Examples

설계 예시

KEY TERMS AND CONCEPTS

핵심 용어 및 개념

Design Example: Joints in Concrete Pavements

concrete pavement joint types and functions

Concrete pavement joints guide where slabs crack and help protect the pavement over time. They support the structural integrity and long life of the concrete by controlling movement and cracking.

Contraction joints, also called control joints, are made by sawing a groove into the concrete soon after it hardens. This groove creates a weakened vertical plane. It encourages cracking at a planned location instead of letting cracks form randomly across the slab.

Isolation joints are used where the pavement meets another surface or a fixed object. Common examples include a roadway intersection or a utility fixture such as a manhole. These joints use compressible material that fills the full depth of the joint, so the pavement and nearby structure can move independently.

Construction joints appear where fresh concrete meets hardened concrete, often at the end of a paving day. They handle the transition between sections of pavement. Dowel bars or tie bars are embedded between the sections to help connect them.

Expansion joints allow concrete slabs to expand without building up too much compressive force. That helps prevent joint spalling and structural blowups. These joints usually include load transfer devices such as dowels or tie bars, which support movement mainly along the joint direction. In general, joints are finished with filler materials and sealants.

Concrete Pavement Joint Types and Functions

design example: dimensioning of concrete masonry construction

design-example-dimensioning-of-concrete-masonry-construction

Sizing a Storeroom with Masonry Blocks

Sizing a storeroom with concrete masonry blocks starts with matching the wall plan to the actual block size and mortar joints. The site has concrete masonry units with a nominal size of 8 by 8 by 16 inches. The storeroom is planned with external dimensions of 12 feet long and 8 feet wide. The wall layout uses nine blocks along the length and six blocks along the width. Each block is actually 7 and 5/8 inches high and wide, and 15 and 5/8 inches long. A 3/8 inch mortar joint is included, so the...

design example: joints in concrete pavements

Concrete pavement joints guide where slabs crack and help protect the pavement over time. They support the structural integrity and long life of the concrete by controlling movement and cracking. Contraction joints, also called control joints, are made by sawing a groove into the concrete soon after it hardens. This groove creates a weakened vertical plane. It encourages cracking at a planned location instead of letting cracks form randomly across the slab. Isolation joints are used where the...

design example: aggregate gradation

Choosing Well-Graded Sand for Concrete

Well-graded sand is important in concrete because aggregate choice affects strength, mix proportions, and cost. In concrete, sand is the common fine aggregate. When more than one sand source is available, its gradation often guides the selection. Gradation means the particle-size distribution of the sand. Engineers measure it with sieve analysis, which uses standard sieve sizes from 150 μm to 10 mm, from ASTM No. 100 to the 3/8 in. sieve. This test shows how much sand stays on each sieve and...

design example: managing concrete workability

design-example-managing-concrete-workability

Concrete Slump Test in Hot Weather

Concrete slump testing helps track workability during a raft foundation pour in hot weather. Workability means fresh concrete is easy to place, compact, and finish. In this example, the concrete had to be prepared for a large foundation, so keeping it workable was important for quality and durability. The first slump test showed low workability. The mix was losing water quickly, and the high temperature made the coarse aggregates hotter as well. To reduce that effect, the site engineer cooled...

design example: distributing reinforcements in concrete sections

design-example-distributing-reinforcements-in-concrete-sections

Sizing Steel Bars for a Concrete Beam

Sizing steel bars for a concrete beam helps meet a required reinforcement area. In reinforced concrete design, the steel must be arranged so the beam stays strong and uses material efficiently. This example uses a beam that needs a total steel cross-section of 4 square inches. The available bars in the example have a nominal diameter of 1.693 inches. Each bar provides a cross-sectional area of 2.25 square inches. When the engineer divides the required area by the area of one bar, the result is...

design example: sustainability in concrete building

design-example-sustainability-in-concrete-building

Green Features in a Concrete Building

A sustainable concrete building can use several green design features to save energy, water, and materials. Concrete is a flexible material for these choices, so it supports eco-friendly construction in commercial buildings. One strategy is to place a concrete parking area under the building. Open areas can use pervious concrete paver blocks, which let rainwater pass through and collect in an underground cistern. That stored water can then be reused for gardening, which improves water...

key terms and concepts

Learn how contraction, isolation, construction, and expansion joints control cracking, movement, and support in concrete pavements.

Concrete Pavement Joint Types and Functions | 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.

Concrete Pavement Joint Types and Functions

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