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What is the effect of age of concrete upon the water-cement ratio and strength curve?
The age of concrete significantly affects its water-cement ratio and strength. As concrete matures, its strength generally increases due to the ongoing hydration of cement particles, which leads to a denser microstructure. Initially, higher water-cement ratios may lower strength but are essential for workability; as concrete cures, the effective water-cement ratio decreases, contributing to strength gain over time. Ultimately, strength curves show that concrete continues to gain strength well beyond the initial setting period, often achieving substantial increases up to several months or years, depending on conditions.
Does the amount of water in a gravel based concrete depends on how fast it will harden?
yes, because after casting, concrete will get its 90% strength within 28 days and proper hydration require the proper amount of water for atleast 28 days.
What is tensile strength of concrete?
The tensile strength of concrete is 10% of it's compressive strength.
What is the purpose of adding a curing compound to the concrete?
Curing is necessary for freshly cast concrete in order to maintain the moisture as the chemical constituents in cement react with water and heat evolves continuously until the setting process completes. The heat evolved during the setting of concrete is called heat of hydration, and this heat causes the water to evaporate. Proper and complete setting process is the most important phenomenon that imparts the desired strength to the concrete. If the freshly cast concrete is not cured, it develops cracks and also the chemical reactions will cease resulting in bad concrete.
How does the moisture affect the strength values of concrete?
the moisture of concrete is main strength for reinforced concrete structure
Meaning of hydration in concrete?
Hydration in concrete refers to the chemical reaction between water and cement which causes the mixture to harden and gain strength. This process is crucial for the development of the concrete's properties and durability. Proper hydration is necessary to ensure the concrete reaches its desired strength and durability.
What is hydration of concrete?
Hydration of concrete is a chemical reaction that occurs between cement and water, resulting in the formation of bonds between cement particles and aggregates. This process is essential for the concrete to harden and develop its strength and durability over time. Proper hydration is crucial for achieving desired concrete properties and ensuring long-term performance.
What are the problems associated with heat of hydration?
Some problems associated with heat of hydration include potential cracking and reduced strength of concrete due to rapid heat generation during the hydration process. Excessive heat can also lead to thermal gradients within the concrete, which can cause internal stresses and weaken the structure. Controlling the heat of hydration is important to ensure the durability and performance of the concrete.
What is the effect of age of concrete upon the water-cement ratio and strength curve?
The age of concrete significantly affects its water-cement ratio and strength. As concrete matures, its strength generally increases due to the ongoing hydration of cement particles, which leads to a denser microstructure. Initially, higher water-cement ratios may lower strength but are essential for workability; as concrete cures, the effective water-cement ratio decreases, contributing to strength gain over time. Ultimately, strength curves show that concrete continues to gain strength well beyond the initial setting period, often achieving substantial increases up to several months or years, depending on conditions.
What effect has the quantity of mixing water have upon the quality of concrete?
the strength of concrete is effected by water /cement ratio as the water/cement ratio increases the strength of the concrete decreases
Does concrete have crystals?
Yes, concrete does contain crystals. During the hydration process of cement in concrete, crystalline structures form as the cement particles react with water to create a solid matrix. These crystals contribute to the strength and durability of concrete.
How long does concrete need to cure in order to achieve maximum strength and durability?
Concrete typically needs to cure for at least 28 days to achieve maximum strength and durability. During this time, the concrete undergoes a chemical process called hydration, which strengthens the material and improves its durability.
What is curing of concrete?
The curing of concrete is a reaction between the type of cement in the concrete and the water. This reaction between cement and water is known as hydration. When the concrete sets and gains strength through this process it is known as curing. Test cylinders of concrete for construction projects are placed in a curing room where they are continuous misted with water at 23 +-2 degrees Celsius for 7 and 28 days before testing. This provides adequate curing.
What can effect the strength of concrete?
The water/concrete ratio, not mixing it well enough, quality of raw materials, the age of the concrete, and the temperature and humidity of the area surrounding the concrete.
What is the strength of steel reinforced concrete?
The reinforcment will have little or no effect on compressive strength. It will however impact tensile strength. It depends on the concrete mix design and amount of reinforcment, what the tensile strength impacts will be. The question needs to be a lot more detailed to provide a specific answer.
Concrete cure time?
In anarid region, concrete placed as a road slab or roof slab gets dried up in a very short time, say within 2 hours.This condition should be maintained for 24 hours or at least till the final setting time of cement at which duration the concrete will haveassumed the finalvolume.Normally curing is done for 28days at 90% of strength gain is achievedUntil maximum design strength is achieved (should be 28 days): Concrete does not gain strength by "Drying out". It gains it through a process known as hydration. The road slabs used as an example in the first post will still undergo hydration once water makes contact with the concrete. (rain). k.k
Does the amount of water in a gravel based concrete depends on how fast it will harden?
yes, because after casting, concrete will get its 90% strength within 28 days and proper hydration require the proper amount of water for atleast 28 days.
