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What factors affect the workability of a concrete mix?
1),water content 2),mix praportions 3),size of aggregates 4),shape of aggregate 5),surface texture 6),grading of aggregates 7),use of admixture
Maximum bulking in sand and in what moisture content?
The maximum bulking of sand is in 13% to 14% moisture content. It's likely to be 13.8% moisture content.
How long would approximately 3 deformed rebar rust and crack through concrete if the bars were forming stakes and come from ground into concrete?
It depends on the moisture content of the soil, the acidity of the soil as well as other factors. "But practically, the answer is forever."
Why is moisture content of soil important in construction?
water content is an important property to establish relationship between the how soil behaves and its properties.consistency largely depends upon water content.also it helps in phase relationship.
What is the range of specific gravity of fine aggregate?
The specific gravity of fine aggregate typically ranges from 2.60 to 2.80. This range can vary depending on the mineral composition and moisture content of the aggregate. Specific gravity is an important property that influences the weight, volume, and overall performance of concrete mixtures.
How the moisture content of the aggregates obtainable at site affect the water content ratio specified?
Obviously, if the aggregates are in a surface wet condition, meaning the moisture content is greater than the absorption, that surface water increases the water-to-cement ratio and affects strength and durability.
How the moisture content of the aggregates obtainable at site affects the water content ratio specified?
Obviously, if the aggregates are in a surface wet condition, meaning the moisture content is greater than the absorption, that surface water increases the water-to-cement ratio and affects strength and durability.
Why is it important to minimize the alkali metal content of concrete?
It is important to minimize the alkali metal content of concrete because concrete contains trace amounts of alkali metals like sodium and other minerals and if moisture is present then the sodium reacts with the minerals in the concrete, forming a gel and the gel may absorb water and expand causing cracks in the concrete.
How do you calculate moisture content in existing concrete floors?
There are several test devised, pertaining to moisture content in concrete! Everything from vapor emissions to relative humidity. By Far the most reliable is ASTM 2170 that measures the relative humidity inside the concrete. Unusual question for a lay person, since most people don't even consider concrete is a giant sponge! Don't fall for ASTM 1869 as a test method --- Very cheap, but not worth much. If someone shows up with a surface moisture meter for testing --- Show him the Door!
What is the Is code of silt content?
The IS code for the determination of silt content in fine aggregates is IS: 2386 (Part 1) - 1963. This standard specifies the method for determining the silt content in the fine aggregate for concrete.
What factors affect the workability of a concrete mix?
1),water content 2),mix praportions 3),size of aggregates 4),shape of aggregate 5),surface texture 6),grading of aggregates 7),use of admixture
What is the cement content for M7.5 grade concrete?
For M7.5 concrete, the common mix ratio is 1:4:8. This means:1 part cement 4 parts fine aggregates (sand)8 parts coarse aggregates. These ratio is by volume.
What difficulties arise in the use of aggregates which absorb water How theyovercome (a) in the laboratory and (b) on the job?
When using aggregates that absorb water, several difficulties can arise. These difficulties include: Increased water demand: Aggregates that absorb water can increase the water demand in a concrete mix. This can lead to challenges in achieving the desired water-cement ratio and can affect the strength and durability of the concrete. Reduced workability: The absorption of water by aggregates can reduce the workability of the concrete, making it more difficult to place and finish. This can result in issues such as segregation, poor compaction, and difficulty in achieving the desired surface finish. To overcome these difficulties, the following approaches can be taken: (a) In the laboratory: Pre-wetting aggregates: One way to overcome the increased water demand and reduced workability is to pre-wet the aggregates before mixing them with cement and other ingredients. This ensures that the absorbed water in the aggregates is taken into account during the mix design process. It helps maintain the desired water-cement ratio and improves workability. Adjusting mix proportions: The mix proportions can be adjusted by considering the absorption characteristics of the aggregates. By accounting for the water absorption capacity of the aggregates, the required water content can be determined to achieve the desired consistency and workability. (b) On the job: Proper storage and handling: Aggregates should be stored in covered areas or protected from rainwater to prevent additional water absorption. Proper handling practices during transportation and on-site storage can help minimize the absorption of water by aggregates. Moisture control: On-site, measures can be taken to control moisture levels. For example, if the aggregates are excessively dry, they can be sprayed with water to ensure they have the right moisture content before mixing. Conversely, if the aggregates are already saturated, adjustments can be made to the mix design to compensate for the absorbed water. By implementing these strategies, the difficulties associated with the use of aggregates that absorb water can be mitigated, ensuring better concrete performance both in the laboratory and on the job.
What is weight of 5 gallon bucket of concrete?
A 5-gallon bucket of concrete typically weighs around 100-125 pounds (45-57 kg) depending on the mix and moisture content. It's important to factor in the weight of the bucket itself when calculating the total weight.
What has the author Gary Thompson written?
Gary. Thompson has written: 'Determining asphalt content for recycled asphalt pavement (RAP) materials' -- subject(s): Asphalt concrete, Asphalt concrete Pavements, Oregon, Recycling, Testing, Waste products as road materials 'Investigation of the Bailey method for the design and analysis of dense-graded HMAC using Oregon aggregates' -- subject(s): Additives, Aggregates (Building materials), Asphalt concrete Pavements, Design and construction
Can electrical current flow through concrete?
Yes, electrical current can flow through concrete as it is a good conductor of electricity. However, the resistance of the concrete will depend on its moisture content and composition. Generally, wet concrete will conduct electricity better than dry concrete.
Why you are doing initial moisture content critical moisture content and equilibrium moisture content test?
if we know initial moisture content of the object we can identify how much drying energy required for dry the same moist material. if it is a food material we have to reduce the moisture content upto certain level, otherwise it may be destroyed. if we know the initial moisture content of same food object, we can reduce its moisture content upto 10% of its initial moisture content.
