Name: concrete wear tests and surface durability
Uploaded: 2024-11-07T14:48:31.000Z
Duration: 1 min 23 s
Channel: JoVE

K12 Standards

Alabama Course of Study Science

9-12

Earth and Space Science

Earth's Systems

9-12.ESS.2.4.b

Abrasion Resistance of Concrete

콘크리트 마모는 표면의 차량 마모 또는 물의 연마 물질로 인해 발생할 수 있으며, 이는 운하 라이닝을 침식합니다.
쇼트 블라스트 테스트는 콘크리트 샘플에서 4인치 떨어진 90psi의 0.25인치 노즐에서 각각 ASTM No. 20 크기와 동일한 2000개의 강철 샷을 블라스팅하여 수성 고체의 콘크리트 침식을 평가합니다.
회전 디스크 테스트에서 3개의 평판은 초당 0.2 사이클의 주파수로 원형 운동으로 회전하며, 각 플레이트는 초당 4.7 사이클로 축을 켭니다. 실리콘 카바이드는 판과 콘크리트 사이의 연마 물질 역할을합니다.
강철 공 마모 시험은 강철 공에 의해 콘크리트에서 분리되어 회전하는 머리에 힘을 가합니다. 이 시험은 순환수를 사용하여 마모 된 재료를 제거하는 것을 포함합니다.
드레싱 휠 테스트에는 샘플과 접촉하는 7개의 회전 휠로 구성된 3세트에 힘을 가하는 수정된 드릴 프레스가 포함되며, 구동 헤드는 30분 동안 초당 0.93사이클의 빈도로 회전합니다.
콘크리트 표면 마모의 양은 이러한 테스트에서 관찰된 마모 깊이에 의해 정량화됩니다.

콘크리트의 내마모성

내마모성은 다양한 마모 조건에서 내구성과 수명을 결정하는 콘크리트의 필수적인 특성입니다. 콘크리트 표면은 다양한 유형의 마모에 취약합니다. 예를 들어, 표면은 차량의 끊임없는 움직임으로 인해 마모되거나 콘크리트 운하 라이닝에서 볼 수 있듯이 물에 떠 있는 고형물에 의해 침식될 수 있습니다. 콘크리트의 내마모성을 측정하기 위해 특정 테스트가 수행됩니다.


 그러한 테스트 중 하나는 실리콘 카바이드를 연마 물질로 사용하여 3개의 판이 콘크리트에 대해 회전하는 회전 디스크 테스트입니다. 또 다른 테스트는 회전하는 강철 볼과 물을 사용하여 마모 과정을 시뮬레이션하는 강철 볼 마모 테스트입니다. 세 번째 테스트인 드레싱 휠 테스트는 회전하는 휠을 콘크리트에 대고 누르는 개조된 드릴 프레스를 사용합니다. 이러한 테스트는 표면의 마모 깊이를 측정하여 콘크리트의 내마모성을 평가합니다.


 이러한 테스트의 결과는 도로 및 유압 설비와 같은 일상적인 구조물에서 흔히 볼 수 있는 조건에서 콘크리트가 어떻게 견디는지 이해하는 데 중요합니다. 내마모성의 정도는 일반적으로 콘크리트의 물-시멘트 비율 및 압축 강도와 상관 관계가 있습니다. 더 나은 내마모성은 종종 강하고 내구성 있는 표면 층이 있는 콘크리트에서 발견됩니다. 최적의 내마모성을 위해서는 적절한 콘크리트 마감 및 경화 방법이 필수적입니다.

콘크리트 마모는 표면의 차량 마모 또는 물의 연마 물질로 인해 발생할 수 있으며, 이는 운하 라이닝을 침식합니다.
샷 블라스트 테스트는 ...

Education

교육

JoVE Core

Civil Engineering

토목공학

Unit 1

제1단원

Strength of Concrete

콘크리트 강도

KEY TERMS AND CONCEPTS

핵심 용어 및 개념

concrete wear tests and surface durability

Concrete wear tests show how well a surface can stand up to abrasion and long-term use. Abrasion is the wearing away of a material by rubbing, scraping, or contact with moving solids. This property matters because concrete surfaces can lose material under vehicle traffic or when solids carried in water brush against them.

The transcript describes three tests used to measure concrete abrasion resistance. In the revolving disc test, three plates rotate against the concrete, and silicon carbide acts as the abrasive material. The steel ball abrasion test uses rotating steel balls and water to mimic wear. The dressing wheel test uses a modified drill press that presses rotating wheels against the concrete surface.

These tests measure wear resistance by checking how deep the abrasion reaches into the concrete. The results help show how concrete may perform in roads and hydraulic installations, such as canal linings. Abrasion resistance is often linked with the water-to-cement ratio and compressive strength, and a strong, durable surface layer usually gives better resistance. Proper finishing and curing are important for achieving that kind of surface.

Concrete Wear Tests and Surface Durability

concrete-wear-tests-and-surface-durability

tensile strength considerations of concrete

tensile-strength-considerations-of-concrete

How Cracks Limit Concrete Strength

Concrete tensile strength is limited by tiny cracks inside the material. The cement paste itself can be much stronger in theory than it is in practice. In real concrete, the measured strength can be up to a thousand times lower than the theoretical value. These small cracks help explain that gap. When a load is applied, stress rises at the crack tips. This idea is described by Griffith's theory of brittle fracture. In brittle materials, cracks can grow quickly once the stress at their tips...

behavior of concrete under compressive load

behavior-of-concrete-under-compressive-load

Concrete Failure Patterns Under Compression

Concrete failure patterns under compression show how the material responds to different kinds of direct stress. These patterns help explain concrete’s structural integrity. Under uniaxial compression, where force acts in one direction, cracks often form parallel to the load. These parallel cracks come from local tensile stress, which is pulling stress that appears perpendicular to the compression direction. As uniaxial loading continues, angled cracks may also appear. These cracks are linked...

porosity in cement paste

How Cement Curing Changes Porosity

Cement curing changes porosity in the hardened paste. Porosity means the void spaces inside concrete. These spaces affect both strength and durability. When water and cement react, hydration forms a semi-solid paste that traps water in different ways. Some of that water becomes combined water. It makes up about 23% of the cement's dry mass. Other water stays as gel water, which fills very small voids called gel pores. Gel pores account for about 28% of the cement gel volume. The...

total voids in concrete

Concrete Voids and Strength

Concrete voids affect both strength and permeability. They include gel water, capillary pores, and entrapped air. In hydrated cement paste, gel water is held within the cement hydration products. Physically entrapped or adsorbed water also supports the hydration process. As cement hydrates, the space needed for the products from a cubic centimeter of cement is estimated to double. Capillary pores are the open spaces left inside the hydrated paste. Their size depends mainly on the...

pore size distribution

Concrete Porosity and Durability

Concrete porosity and durability depend strongly on pore size distribution in hardened cement paste. Capillary pores are much larger than gel pores, and in partially hydrated cement paste they form a connected network that lowers strength and raises permeability. Higher permeability makes concrete more vulnerable to freeze-thaw damage and chemical attack. The risk also depends on the water-to-cement ratio. A higher ratio can leave more space for capillary pores to remain open. As cement...

microcracking in concrete

How Concrete Cracks Before Failure

Concrete can develop tiny cracks before any outside load is applied. These microcracks usually form at the boundary between coarse aggregate and hydrated cement paste. They often result from small volume changes caused by stress-strain differences, heat, and moisture movement. At first, these microcracks stay stable. They usually do not grow much until the concrete reaches about 30 percent of its ultimate strength. As the load rises, the material can begin to change more quickly. When...

water cement ratio

Concrete Strength and Water Balance

Concrete strength depends on the balance between water and cement in the mix. This water-cement ratio is the weight of water compared with the weight of cement. It affects strength, durability, and how well concrete resists environmental stress. Abrams’ law shows that less water usually makes stronger concrete. Water is still needed for hydration, which is the chemical process that binds water and cement. It also helps the mix stay workable and compactable. Some water must be absorbed into the...

aggregate cement ratio

How Mix Ratio Changes Concrete Strength

The aggregate cement ratio changes how concrete performs. It is the weight of aggregate divided by the weight of cement in a concrete mix. This ratio affects strength, workability, and durability, so it is an important part of concrete design. A higher aggregate cement ratio makes the mix leaner. Lean mixes have less cement paste to coat and lubricate the aggregate, so they can be harder to work with. At the same time, they may increase strength because the concrete has less total porosity, or...

transition zone

Concrete Transition Zone and Its Porosity

The concrete transition zone is the thin region where aggregate meets cement paste. It has more pores than the surrounding material, so it is usually weaker at first. The bond around the aggregate comes mainly from Van der Waals forces, which are weak attraction forces between particles. When concrete is compacted, this zone often has a higher water-cement ratio near the aggregate. That extra water can form thin water films around the coarse aggregate. These films increase porosity and help...

relation between tensile strength and compressive strength of concrete

relation-between-tensile-strength-and-compressive-strength-of-concrete

Concrete Strength Testing: Tension vs. Compression

Concrete strength testing compares tensile strength and compressive strength. These two properties are related, but they do not rise at the same rate. Tensile strength usually grows more slowly than compressive strength, so the balance between them changes as concrete gets stronger. Several factors affect tensile strength measurements. The test method, specimen size and shape, aggregate texture, and moisture content can all change the result. Direct tension tests are difficult to perform...

fatigue strength of concrete

Concrete Fatigue Under Repeated Loads

Concrete fatigue describes how concrete can weaken or fail when loads are applied again and again, even when each load is below the material’s strength limit. This property matters because it affects the durability and service life of concrete structures. In materials science and engineering, fatigue is a key reason concrete may not last as long as expected under real use. Concrete can fail in two main ways through fatigue. Static fatigue, also called creep rupture, happens under a constant...

impact strength of concrete

Concrete Impact Resistance in Real Use

Concrete impact resistance matters when a material must handle repeated blows and sudden loads. It is important during pile driving, where concrete piles are driven into the ground. It also matters for machinery foundations that experience impulsive loads and for precast concrete parts that can be damaged during handling. Impact strength is measured by checking how well concrete absorbs energy from repeated impacts. A major sign of serious damage is when the concrete does not rebound after...

abrasion resistance of concrete

Concrete wear tests show how well a surface can stand up to abrasion and long-term use. Abrasion is the wearing away of a material by rubbing, scraping, or contact with moving solids. This property matters because concrete surfaces can lose material under vehicle traffic or when solids carried in water brush against them. The transcript describes three tests used to measure concrete abrasion resistance. In the revolving disc test, three plates rotate against the concrete, and silicon carbide...

reinforcements in concrete

Steel Bars in Concrete Structures

Steel bars in concrete structures help the material carry both compression and tension. Concrete is strong when it is squeezed, but it is weak when pulled. Rebar, or reinforcing steel bars, is placed inside the concrete to handle those tensile forces. Steel is a practical choice because it has a similar coefficient of thermal expansion to concrete. That means both materials expand and contract in a similar way as temperature changes. The steel used for reinforcement is usually made by a...

fiber reinforced concrete

Concrete Strength with Added Fibers

Fiber-reinforced concrete is concrete that includes added fibers to improve strength and durability. It uses hydraulic cement with fine or coarse aggregates, plus separated, non-continuous fibers mixed through the material. These fibers can come from steel, glass, and polymers, as well as natural sources such as sisal and cellulose or manufactured sources such as polypropylene and Kevlar. Steel fibers are often preferred because they are strong and tough. They help concrete resist cracking and...

prestressed concrete

How Concrete Is Preloaded for Strength

Prestressed concrete is a construction method that preloads concrete so it can handle more stress. High-strength steel strands are stretched before or after the concrete is loaded in service. The goal is to put the concrete into compression. That compression helps balance the tension the structure will face later. By reducing tension, prestressing helps limit cracks in the concrete. It can also let a structure carry greater loads or span longer distances than conventional reinforced concrete.

ferrocement

Ferrocement Mesh and Mortar Design

Ferrocement is a construction material made from dense layers of mesh or fine rods covered fully in cement mortar. It is a form of reinforced concrete, but it uses mesh instead of the larger steel bars found in standard reinforced concrete. This structure gives ferrocement its thin, flexible form. The material is built from wire meshes and a mortar made of cement and sand. The mortar is usually mixed in a 1:2 or 1:3 ratio. The water-to-cement ratio is kept between 0.40 and 0.45. This helps the...

non-destructive tests for concrete strength

non-destructive-tests-for-concrete-strength

Concrete Strength Checks Without Breaking It

Concrete strength can be checked without fully breaking the material. Two common methods are the rebound hammer test, also called the Schmidt hammer test, and the penetration resistance test, also called the Windsor Probe test. Both are used to estimate the strength of existing concrete. The rebound hammer test measures the hardness of the concrete surface and gives an indirect clue about strength. A spring-driven mass moves inside a tubular housing and strikes a plunger against the concrete.

key terms and concepts

Learn how concrete abrasion resistance is measured with revolving disc, steel ball, and dressing wheel tests, and why surface durability matters in roads and canal linings.

Concrete Wear Tests and Surface Durability | 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

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Concrete Wear Tests and Surface Durability

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Transcript

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