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What is the significance of grading aggregate?
The grading of aggregate influences the mix proportions for a specified workability and water-cement ratio. Coarser the grading leaner will be mix which can be used. Very lean mix is not desirable since it does not contain enough finer material to make the concrete cohesive. The type of aggregate influences strongly the aggregate-cement ratio for the desired workability and stipulated water cement ratio. An important feature of a satisfactory aggregate is the uniformity of the grading which can be achieved by mixing different size fractions.
How the changing of workability when the concrete mixture containing high aggregate content?
Aggregate to cement ratio is an important thing which affects the workability....! If the aggregate/cement ratio is higher , the concrete will be Leaner. Less quantity of paste is available for lubrication, Hence workability decreases..!! On the other hand if the aggregate/cement ratio is lower, the concrete will be fatty. Higher quantity of paste is available for lubrication. Hence workability increases. ! Thus Higher aggregate content leads to lowering of workability....!
What is mean by good grading?
The word "grading" refers to the diversity in size of the aggregates. Aggregates that have "good grading" or are "well graded" have the same % of each size stone. The goal is to get the maximum aggregate packing density within a mix that still allows the cement to bond to the aggregates and cure properly, since its the aggregates that give concrete its high compressive strength.
What is the effect of the salt contamination of aggregate in concrete?
It would weaken the concrete, so keep out the salt.
What is workability?
Workability refers to the ease of which the soil can be physically controlled for the purpose of cultivation. For example, if tilling or digging the soil produces cloddy or plate like clumps, the workability is low. From what I already know, clay soils aren't the best in terms of workability because it clumps together and is difficult to break up, whilst sandy soils usually have a much better workability but tend to be poor for cultivation because of other reasons.
What is the significance of grading aggregate?
The grading of aggregate influences the mix proportions for a specified workability and water-cement ratio. Coarser the grading leaner will be mix which can be used. Very lean mix is not desirable since it does not contain enough finer material to make the concrete cohesive. The type of aggregate influences strongly the aggregate-cement ratio for the desired workability and stipulated water cement ratio. An important feature of a satisfactory aggregate is the uniformity of the grading which can be achieved by mixing different size fractions.
How the changing of workability when the concrete mixture containing high aggregate content?
Aggregate to cement ratio is an important thing which affects the workability....! If the aggregate/cement ratio is higher , the concrete will be Leaner. Less quantity of paste is available for lubrication, Hence workability decreases..!! On the other hand if the aggregate/cement ratio is lower, the concrete will be fatty. Higher quantity of paste is available for lubrication. Hence workability increases. ! Thus Higher aggregate content leads to lowering of workability....!
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 mean by nominal size of aggregate?
Nominal size is the size of the largest aggregate in a grading.
What meant by well graded aggregate?
Well-graded aggregate refers to a mixture of different particle sizes that provides a dense and compact structure in concrete or asphalt. This grading ensures that smaller particles fill the voids between larger particles, resulting in improved workability, reduced void content, and enhanced mechanical properties. A well-graded aggregate can lead to better strength, durability, and resistance to segregation in construction materials.
How to improve the workability of concrete?
To improve the workability of concrete, issue to be concerned of as below: - increase water/cement ratio - increase size of aggregate - use well-rounded and smooth aggregate instead of irregular shape - increase the mixing time - increase the mixing temperature - use non-porous and saturated aggregate - with addition of air-entraining mixtures
What is the workability of concrete?
The property of concrete which determines the amount of useful work (like- water content, mix proportion, size of aggregate used and use of admixtures) necessary to produce full compaction is called workability.
Factors affecting mix design?
Compressive Strength Workability Durability Maximum Size of Aggregate Water/Cement Ratio Quality Control
What is workability in morter?
Workability in mortar refers to its ease of mixing, handling, and application without compromising its strength and performance. It encompasses characteristics such as consistency, plasticity, and flow, allowing the mortar to be easily spread and shaped. High workability ensures good adhesion and bonding with masonry units, leading to more robust construction. Factors like water content, type of aggregate, and admixtures influence the workability of mortar.
In what sizes of particle the aggregate are deficient or oversupplied?
In fine aggregate, particles smaller than 75 microns can lead to deficiencies in properties like workability and affecting the water requirement, while an oversupply of particles smaller than 75 microns can lead to problems like excessive bleeding and segregation. In coarse aggregate, an oversupply of very fine particles (dust) can affect workability and may lead to a lower strength of the concrete due to reduced paste content.
Why is the slump not a direct measure of workability?
The slump test measures the consistency and flow of fresh concrete but does not directly quantify workability. Workability encompasses various factors, including the ease of mixing, placing, and finishing, which are influenced by aggregate shape, size, and moisture content. Additionally, different mixes with the same slump may exhibit varying workability due to differences in material properties and proportions. Therefore, while the slump provides useful information, it does not fully capture the overall workability of concrete.
What would be the effect upon unit weight if damp fine aggregate be used?
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