Name: water tests for concrete performance
Uploaded: 2024-11-07T14:48:25.000Z
Duration: 1 min 14 s
Channel: JoVE

K12 Standards

ohios-learning-standards-and-model-curriculum

Ohio’s Learning Standards and Model Curriculum

9-12

Physical Geology

Earth's Resources

Water

Testing Water Quality

コンクリートの準備に利用できる水質が不確かな場合、その適合性は、セメントの硬化時間や試験水で作られたモルタルキューブの圧縮強度を、脱イオン水または蒸留水で作られたものと比較することによって決定されます。
設定時間と圧縮強度について得られた値が規格に記載されている許容範囲内にある場合、試験水を使用してコンクリートを調製できます。
汽水がコンクリートを混合するための唯一の利用可能な選択肢である場合、その中に存在する塩化物、硫酸塩、およびアルカリの濃度が基準で規定された許容範囲内にあることを確認することは、コンクリートの品質を維持する上で重要です。
コンクリートの混合に海水を使用する場合、海水と淡水で調製したコンクリートの圧縮強度をテストし、その結果を比較して、長期安定性が15%以上低下しないことを確認します。
硬化に使用される水がコンクリート表面に汚れを引き起こす可能性は、コンクリート表面の濡れと蒸発をシミュレートする性能試験を実施することで判断できます。

水質検査

コンクリートの準備に使用する水の品質が不確かな場合は、脱イオン水または蒸留水を基準として比較することで、セメントの凝結時間とモルタルの圧縮強度への影響を評価します。米国材料試験協会 (ASTM) C1602 では、凝結時間が基準値から 90 分以内に収まることが求められ、英国規格 (BS) 3146:1980 では初期凝結に 30 分の変動が認められていますが、英国規格 (BS)・欧州統一規格 (EN) 1008 では、初期凝結時間は 1 時間以上、最終凝結時間は 12 時間未満で、蒸留水の結果との変動は 25 %以内である必要があります。試験水で作られたモルタル キューブは、蒸留水で作られたものの 90 %以上の圧縮強度を達成する必要があります。


 塩化物、硫酸塩、全固形物、アルカリなどの不純物の検査は、コンクリートの品質を保証するために、濃度が規定の制限を超えてはならないため、非常に重要です。海水を使用する場合、コンクリートの長期圧縮強度は、淡水で製造されたコンクリートの強度より 15 %以上低くてはなりません。さらに、自然な湿潤と乾燥をシミュレートする性能試験を実施して、潜在的な汚れの有無を確認します。これは、コンクリートの外観を損なうことなく、水が硬化に適しているかどうかを確認するために必要な手順です。

コンクリートの準備に利用できる水質が不確かな場合、その適合性は、セメントの硬化時間と...

Education

JoVE Core

Civil Engineering

土木工学

Unit 1

ユニット1

Aggregates and Water

骨材および水

KEY TERMS AND CONCEPTS

主要用語と概念

water tests for concrete performance

Water tests for concrete performance help determine whether an uncertain water source is safe to use in cement and mortar. The main checks compare the water against de-ionized or distilled water benchmarks. Engineers look at both setting time and the compressive strength of mortar made with the test water.

Standards set clear limits for these results. ASTM C1602 requires setting times to stay within 90 minutes of the control. BS 3146:1980 allows a 30-minute change in initial setting, while BS EN 1008 requires the initial setting time to be at least 1 hour and the final setting time to be less than 12 hours. BS EN 1008 also allows only a 25 percent variation from the results with distilled water.

Mortar cubes made with the test water must also be strong enough. They need to reach at least 90 percent of the compressive strength of cubes made with distilled water. The water is also checked for impurities such as chlorides, sulfates, total solids, and alkalis. These levels must stay below set limits to protect concrete quality.

Seawater can be used in some cases, but it needs extra checking. Its long-term compressive strength must not be more than 15 percent lower than concrete made with freshwater. Performance tests that copy natural wetting and drying are also used to look for staining. This step helps confirm that the water is suitable for curing without harming the concrete’s appearance.

Water Tests for Concrete Performance

unsoundness of aggregate due to volume change

unsoundness-of-aggregate-due-to-volume-change

Aggregate Durability in Freeze-Thaw Cycles

Aggregate durability can decline when volume changes damage the particles. Freezing and thawing, thermal change, and wetting and drying all place stress on aggregates. When unsound aggregates break down under these conditions, they can contribute to scaling, pop-outs, and cracking in concrete. Some aggregates are more vulnerable than others. Porous flints, cherts, and aggregates that contain clay minerals are especially prone to this kind of damage. Their internal structure can make them...

deleterious substances in aggregate

Testing Aggregate Impurities in Concrete

Aggregate impurities can lower the quality and durability of concrete. Organic matter, such as loam in sand, can interfere with cement hydration and weaken the bond between the aggregate and the cement paste. Organic impurities are often checked with a colorimetric test. In this test, the darkness of the solution after agitation shows the level of organic content. Clay and fine material can also coat aggregate particles and reduce the bond with the cement paste. The amount of clay and silt in...

sieve analysis and grading curves

Aggregate Size Testing with Sieve Grading

Aggregate size testing with sieve grading measures the particle size distribution of aggregate materials. It starts with a dried sample of aggregate that is weighed first. The sample is then sorted through a stack of square-opening sieves arranged from largest opening on top to smallest opening below. The sieve stack is shaken or vibrated so the particles move through the openings by size. After a set time, the material left on each sieve is weighed. That weight is then written as a percentage...

fineness modulus

Fineness Modulus from Sieve Analysis

Fineness modulus is a numerical index used to describe how coarse or fine aggregate particles are. For sand, it is found from sieve analysis using a standard set of ASTM sieves. The result helps show whether the sample is finer or more coarse. To calculate fineness modulus, first record the weight of aggregate retained on each sieve and in the pan at the bottom. Then find the cumulative weight retained on each sieve. Next, express each cumulative weight as a percentage of the total sample...

types of aggregate grading

Aggregate Grading for Strong Concrete Mixes

Aggregate grading describes the particle size distribution in a sample of aggregate. It is important for making a concrete mix that has enough strength, reasonable workability, and minimal segregation. The right grading also helps concrete stay economical. There are four main types of aggregate gradation: well-graded, uniformly graded, gap-graded, and open-graded. Each type has a different pattern on a gradation curve, which shows how particle sizes are spread across sieve sizes. These...

maximum size of aggregate

How Aggregate Size Affects Concrete Mix

Aggregate size affects how concrete is mixed, placed, and strengthened. The maximum size of aggregate is defined by the sieve aperture that retains 15 percent or more of the particles in the sample. This size choice helps determine the concrete’s water demand, workability, and final strength. Larger aggregate particles reduce the surface area that must be covered by cement paste. As a result, they can lower the water needed in the mix. When the desired workability and richness are kept, this...

quality of water

Water Standards for Concrete Mixing

Water standards for concrete mixing help control strength and durability. Potable water is usually preferred. Even so, it should not contain too much sodium or potassium, because these salts can weaken concrete integrity. Water quality is judged by impurities such as dissolved solids, chlorides, and sulfates. The pH value is ideally between 6 and 8. Slightly acidic natural water may still be acceptable if it does not contain harmful organic matter or algae. Limits for these impurities depend...

testing water quality

Water tests for concrete performance help determine whether an uncertain water source is safe to use in cement and mortar. The main checks compare the water against de-ionized or distilled water benchmarks. Engineers look at both setting time and the compressive strength of mortar made with the test water. Standards set clear limits for these results. ASTM C1602 requires setting times to stay within 90 minutes of the control. BS 3146:1980 allows a 30-minute change in initial setting, while BS...

aggregates classification

Aggregate Types by Size, Weight, and Source

Aggregate types are grouped by size, petrographic characteristics, weight, and source. These categories help describe how different aggregates are identified and used in concrete. Size is one of the most common ways to classify them. Based on particle size, aggregates are either coarse or fine. Coarse aggregates are particles that do not pass through ASTM sieve No. 4. Fine aggregates are the particles that do pass through that sieve. Petrographic classification looks at shared mineral features.

shape and texture of coarse aggregate

How Aggregate Form Changes Concrete

Aggregate form affects how concrete mixes, packs, and bonds. Coarse aggregate is classified by the sharpness or roundness of its edges and corners. The main shapes are rounded, angular, elongated, and flaky. These shapes help show how the particles will behave in concrete. Rounded aggregates are fully shaped by attrition, which means they have been worn down by rubbing and impact. River gravel and seashore gravel are common examples. Angular aggregates, such as crushed rock, have clear edges...

bonding and strength of aggregate

How Aggregate Shape Affects Concrete Bond

Aggregate shape and surface texture affect how well concrete holds together. Rough, angular aggregates usually bond more strongly with the cement matrix than smooth, rounded ones. This stronger adhesion can help produce high-strength concrete. Angular aggregates also have a larger surface area. That gives the cement paste more area to grip, which improves the bond. Bond quality is hard to measure directly, and there is no single test that is accepted everywhere. A broken concrete sample can...

toughness and hardness of aggregate

Testing Aggregate Impact and Abrasion

Aggregate toughness and hardness are important for concrete used on pavement surfaces and industrial floors that must carry heavy loads. Toughness means an aggregate can resist failure from impact. Hardness means it can resist wear.

specific gravity of aggregate

Aggregate Pore Effects on Specific Gravity

Aggregate specific gravity depends on the pores inside the material. These pores may be permeable or impermeable, so the same aggregate can be described in more than one way. For this reason, specific gravity is grouped into bulk or gross specific gravity, apparent specific gravity, and absolute specific gravity. Bulk or gross specific gravity uses the mass of aggregate in the saturated surface-dry state. It is compared with the total volume of the aggregate, including both the solids and the...

bulk density of aggregate

How Aggregate Size Affects Bulk Density

Bulk density describes the mass of aggregate that fills a unit volume, including the empty spaces between particles. Those void spaces remain because aggregate particles cannot be packed so tightly that every gap disappears. In practice, bulk refers to the total volume of both the particles and the spaces around them. This measurement matters when aggregates are batched by volume. It also helps convert materials measured by mass into a volume-based quantity. Natural mineral aggregates such as...

porosity and absorption of aggregate

Aggregate Pore States and Water Uptake

Aggregate contains pores of different sizes, and those pores may be sealed inside the particle or open to the surface. Open pores let water enter the aggregate. Because aggregate makes up about three-quarters of concrete by volume, its porosity strongly affects the porosity of the finished concrete. Aggregate can also be described by its moisture state. When water fills every pore, the material is saturated and surface-dry. If it sits in dry air, some water evaporates and the aggregate becomes...

moisture content and bulking of aggregate

moisture-content-and-bulking-of-aggregate

How Aggregate Moisture Affects Concrete Mixes

Aggregate moisture affects concrete mixing by changing how much water must be added to the batch. Moisture content is the water coating the outside of aggregate that is in a saturated and surface-dry state. The total water in moist aggregate includes both moisture content and water absorption. When aggregates sit in stockpiles or are exposed to rain, they can take in moisture. That extra water must be counted during concrete batching so the water-to-cement ratio stays correct. The moisture...

key terms and concepts

Learn how concrete water is tested for setting time, strength, impurities, seawater limits, and staining risk using ASTM and BS standards.

Water Tests for Concrete Performance | JoVE K12

JoVE Core Civil Engineering provides a foundational exploration of essential construction materials in civil engineering, focusing on bricks, stones, steel, wood, and concrete through easy-to-understand animated videos. This collection covers the properties, manufacturing processes, and practical applications of these materials. Additionally, the accompanied science-in-action videos demonstrate the research experiments performed in laboratories.

civil engineering

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Biofuels: Producing Ethanol from Cellulosic Material

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Quarrying of Stone

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The universe is composed of matter in different forms, and all forms of matter contain energy.&#160; The different forms of energy on Earth originate from ...

Energy resources
• Renewable and nonrenewable energy sources and efficiency
• Alternate energy sources and efficiency
• Resource availability
• Mining and resource extraction

Content elaboration: This unit builds upon a variety of topics studied in previous courses. In elementary school, renewable/nonrenewable energy, soils, the atmosphere and water are introduced. In middle school, Earth's spheres, Earth's resources and energy resources are explored. At the high school level, water, air, chemistry and energy topics are studied. In this course, the Earth Resources topic should be looked at through the lens of geology when referring to renewable/non-renewable resources, air, water, soil, and energy. In this course, renewable and nonrenewable energy resources topics investigate the effectiveness and efficiency for differing types of energy resources at a local, state, national and global level. Feasibility, availability and environmental cost are included in the extraction, storage, use and disposal of both abiotic and biotic resources. Modeling (3-D or virtual), simulations and real-world data are used to investigate energy resources and exploration. The emphasis is on current, actual data, contemporary science and technological advances in the field of energy resources. Relating Earth's resources (e.g., energy, air, water, soil) to a global scale and using technology to collect global resource data for comparative classroom study is recommended. In addition, it is important to connect industry and the scientific community to the classroom to increase the depth of understanding. Critical thinking and problem-solving skills are important in evaluating resource use and conservation. Smaller scale investigations, such as a field study to monitor stream quality, construction mud issues, storm water management, nonpoint source contamination problems (e.g., road-salt runoff, agricultural runoff, parking lot runoff) or thermal water contamination, can be useful in developing a deeper understanding of Earth's resources. Earth systems are used to illustrate the interconnectedness of each of Earth's spheres (hydrosphere, lithosphere, atmosphere and biosphere) and the relationship between each type of Earth's resources.

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Climate Change

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Global Climate Change

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Glovebox and Impurity Sensors

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Air
• Primary and secondary contaminants
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Content elaboration: This unit builds upon a variety of topics studied in previous courses. In elementary school, renewable/nonrenewable energy, soils, the atmosphere and water are introduced. In middle school, Earth's spheres, Earth's resources and energy resources are explored. At the high school level, water, air, chemistry and energy topics are studied. In this course, the Earth Resources topic should be looked at through the lens of geology when referring to renewable/non-renewable resources, air, water, soil, and energy. In this course, renewable and nonrenewable energy resources topics investigate the effectiveness and efficiency for differing types of energy resources at a local, state, national and global level. Feasibility, availability and environmental cost are included in the extraction, storage, use and disposal of both abiotic and biotic resources. Modeling (3-D or virtual), simulations and real-world data are used to investigate energy resources and exploration. The emphasis is on current, actual data, contemporary science and technological advances in the field of energy resources. Relating Earth's resources (e.g., energy, air, water, soil) to a global scale and using technology to collect global resource data for comparative classroom study is recommended. In addition, it is important to connect industry and the scientific community to the classroom to increase the depth of understanding. Critical thinking and problem-solving skills are important in evaluating resource use and conservation. Smaller scale investigations, such as a field study to monitor stream quality, construction mud issues, storm water management, nonpoint source contamination problems (e.g., road-salt runoff, agricultural runoff, parking lot runoff) or thermal water contamination, can be useful in developing a deeper understanding of Earth's resources. Earth systems are used to illustrate the interconnectedness of each of Earth's spheres (hydrosphere, lithosphere, atmosphere and biosphere) and the relationship between each type of Earth's resources.

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Turbidity and Total Solids in Surface Water

Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University
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Dissolved Oxygen in Surface Water

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Nutrients in Aquatic Ecosystems

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Water Quality Analysis via Indicator Organisms

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Demonstrating Author: Luisa Ikner
Water quality analysis monitors ...

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Isolation of Fecal Bacteria from Water Samples by Filtration

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Quality of Water

Water added to concrete aids in the hydration of cement, contributing to the strength and durability of concrete.
Generally, potable water, if available, ...

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Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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Source: Laboratory of Dr. Zhongqi He - United States Department of Agriculture
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Water
• Potable water and water quality
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Soil Nutrient Analysis: Nitrogen, Phosphorus, and Potassium

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Soil and sediment

Water Tests for Concrete Performance

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