Podcast
Questions and Answers
Which test is used for concrete that is too fluid to be measured using the standard slump test?
Which test is used for concrete that is too fluid to be measured using the standard slump test?
What is the purpose of the concrete slump test?
What is the purpose of the concrete slump test?
What is the shape of the metal mould used in the slump test?
What is the shape of the metal mould used in the slump test?
What is the diameter of the top of the slump cone?
What is the diameter of the top of the slump cone?
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How many times is each layer of fresh concrete tamped during the slump test?
How many times is each layer of fresh concrete tamped during the slump test?
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What is the height of the slump cone used in the test?
What is the height of the slump cone used in the test?
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What is the purpose of the flow table test?
What is the purpose of the flow table test?
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What is the diameter of the bottom of the slump cone?
What is the diameter of the bottom of the slump cone?
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What is the tool used in the slump test made of?
What is the tool used in the slump test made of?
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How is the concrete struck off at the end of the slump test?
How is the concrete struck off at the end of the slump test?
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Which of the following is NOT a term used to describe the profile of slumped concrete?
Which of the following is NOT a term used to describe the profile of slumped concrete?
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What does a collapse slump indicate about the concrete mix?
What does a collapse slump indicate about the concrete mix?
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What is the range of slump for very dry mixes typically used in constructing pavements or roads?
What is the range of slump for very dry mixes typically used in constructing pavements or roads?
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What is the range of slump for low workability mixes typically used for foundations with light reinforcement?
What is the range of slump for low workability mixes typically used for foundations with light reinforcement?
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What is the range of slump for medium workability mixes typically used for normal reinforced concrete placed with vibration?
What is the range of slump for medium workability mixes typically used for normal reinforced concrete placed with vibration?
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What is the range of slump for high workability concrete typically used where reinforcing has tight spacing?
What is the range of slump for high workability concrete typically used where reinforcing has tight spacing?
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What is the range of slump where the slump test fails to determine the difference in workability in stiff mixes?
What is the range of slump where the slump test fails to determine the difference in workability in stiff mixes?
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What is the limitation of the slump test in determining workability for wet mixes?
What is the limitation of the slump test in determining workability for wet mixes?
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What is the maximum size of aggregates that the slump test is suitable for?
What is the maximum size of aggregates that the slump test is suitable for?
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What is the height of the slump cone specified in the United Kingdom standards?
What is the height of the slump cone specified in the United Kingdom standards?
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Which standard replaced the British slump test (BS 1881–102)?
Which standard replaced the British slump test (BS 1881–102)?
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How many times should the mixture be tamped down for each layer in the slump test?
How many times should the mixture be tamped down for each layer in the slump test?
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Which test uses a flow table and measures the diameter of the sample?
Which test uses a flow table and measures the diameter of the sample?
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Which test evaluates consistency using a Vebe consistometer?
Which test evaluates consistency using a Vebe consistometer?
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Which automated device can measure and display slump in concrete?
Which automated device can measure and display slump in concrete?
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Which standard code revised in 2013 allows water additions during transit for trucks equipped with automated slump monitoring and measurement systems?
Which standard code revised in 2013 allows water additions during transit for trucks equipped with automated slump monitoring and measurement systems?
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Which test uses an automated slump meter that can add water to the concrete mix in the delivery truck while in transit?
Which test uses an automated slump meter that can add water to the concrete mix in the delivery truck while in transit?
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Which test evaluates slump using a British compacting factor test?
Which test evaluates slump using a British compacting factor test?
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Which test measures the flow of freshly mixed hydraulic cement concrete?
Which test measures the flow of freshly mixed hydraulic cement concrete?
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Which test uses sensors and controls to measure and display slump?
Which test uses sensors and controls to measure and display slump?
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Study Notes
Concrete Testing Methods
- Test for Fluid Concrete: The flow table test is used for concrete too fluid for the standard slump test.
- Purpose of Slump Test: Assesses the workability and consistency of fresh concrete mixes.
Slump Test Equipment
- Mould Shape: The metal mould for the slump test is shaped like a frustum of a cone.
- Top Diameter of Slump Cone: Measures 100 mm at the top.
- Bottom Diameter of Slump Cone: Measures 200 mm at the bottom.
- Height of Slump Cone: Stands at 300 mm.
Conducting the Slump Test
- Tamping Layers: Each layer of fresh concrete is tamped down 25 times during the slump test.
- Concrete Striking Off: The excess concrete is struck off with a straightedge at the top of the cone.
Understanding Slump Results
- Collapse Slump Indicator: Indicates a mix that is too wet and often unsuitable for structural use.
- Slump Range for Very Dry Mixes: Typically ranges from 0 to 25 mm.
- Slump Range for Low Workability Mixes: Generally between 25 to 50 mm, used for lightly reinforced foundations.
- Slump Range for Medium Workability Mixes: Ranges from 50 to 100 mm, suitable for normal reinforced concrete.
- Slump Range for High Workability: Can exceed 100 mm, used for congested reinforcement areas.
- Failure of Slump Test: Occurs when the slump is above 175 mm, making it difficult to assess differences in workability due to the mix's fluidity.
Limitations of the Slump Test
- Not Suitable for Wet Mixes: Performance is limited in measuring workability for very fluid or wet concrete mixes.
- Maximum Aggregate Size: The slump test is suitable for aggregates no larger than 40 mm.
Standards and Codes
- UK Slump Cone Height: Specified at 300 mm in British standards.
- Replaced Standard: The British slump test (BS 1881–102) was replaced by newer standards that focus on more flexible testing methods.
Additional Testing Methods
- Flow Table Test: Specifically measures the diameter of the concrete sample.
- Vebe Consistometer: Used to evaluate consistency.
- Automated Devices: Advanced equipment can measure, display, and even adjust the slump in transit.
- Standard Code Revision (2013): Relevant to water additions during concrete transport using automated systems.
- British Compaction Factor Test: Another test evaluating concrete consistency.
- Freshly Mixed Concrete Flow Test: Measures flow performance of hydraulic cement concrete.
- Automated Slump Meters: Incorporate sensors to continuously measure and display slump.
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Description
Test your knowledge on the concrete slump test, a crucial measure of the consistency and workability of fresh concrete. Learn about its significance in ensuring uniformity and identifying improperly mixed batches.
