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Concrete is made from cement and added gravel. Cement starts out as a powdered rock, which will remain a powder unless water is added to it. Water turns it unto a paste which will gradually harden into a solid material. The water undergoes a chemical reaction with the cement powder.
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Is wet concrete heavier then dry concrete?
Concrete is made of a mixture of cement, aggregate (small stones), fine aggregate (sand), water and other chemical additives. When mixed the wet concrete will remain so for Most people assume that set concrete has no water in it, this is not so, as the water content helps bond the aggregates and cement, this process is known as Hydration. Concrete with no water in it would crumble to dust. Adding more water to the mix will make a concrete that is easier to work, while less water will produce a stronger, more durable concrete. After initial setting of the concrete, a slow amount of water loss is expected due to the concrete drying, it can take anything up to a year for water to stop evaporating slowly out of the concrete. So for this reason the answer to your question is yes, dry, set concrete will weigh less than wet concrete, but for anything up to a year it will keep getting lighter, due to waterloss.
How water cement ratio and workability is related to compaction factor?
If you are talking about shrinkage, then quite a bit. To make concrete, cement and water react together. There is a specific amount of water required to hydrate the concrete. Any water extra must leave the concrete and while it makes the concrete more workable, hurts the concrete is several ways. The volume of the concrete will change by whatever excess water you have added. To get workability, it's always best to use a water reducing admixture.
What is stronger concrete or cement?
Concrete is stronger than cement.It is composed of aggregates (sand and gravel) and cement; and may be cast with reinforcing bar within it (reinforced concrete). Cement is only a part of concrete. Cement has no tensile strength while concrete has compressive and tensile strength.
What are the differences between the mass concrete and reinforced concrete?
Mass concrete is concrete cast without Rebars. They are good in compression and are mostly used for the construction of gravity structures such as Dams. While reinforced concrete have reinforcement bars in them, which increases the tensile strenght of the concrete.
What is the difference between lean concrete and mass concrete?
Mass concrete is concrete cast without Rebars. They are good in compression and are mostly used for the construction of gravity structures such as Dams. While reinforced concrete have reinforcement bars in them, which increases the tensile strenght of the concrete.
What is the basic formula to mix concrete?
Add water while mixing until desired consistency. Despite popular belief, there is no exact formula. It not like cake mix.
How do you prepare solution of hpmc k 100 m?
If you mean HPMC: Hydoroxypropylmethylcellulose then you need to: 1-heat 100ml of DW (deionized water) to 80-90c 2-weight HPMC grams you need to dissolve(1-5%) 3-added HPMC gradually to about 1/4 of water(25ml) while strong mixing is needed 4-then prepare 3/4 of left water with ice in it 5-then added ice water to solution while mixing and you will end in clear solution of HPMC
Why should acids and bases be handled carefully?
the process of dissolving an acid or a base in water is a highly exothermic one. care must be taken while mixing concentrated nitric acid or sulphuric acid with water. the acid must be added slowly to water with contant stirring.
What materials are used to make concrete?
Cement, sand, gravel and water are the most commonly used minimum ingredients to make concrete. However various types of admixtures can be added while making concrete to enhance its properties such as workability, setting time, strength, permiability, durability, chemical resistance, etc.
Is weather abstract?
If you are thinking of abstract versus concrete nouns, weather (the current condition of air and water) is abstract, while air and water (things that exist as physical entities) are concrete.
How do relative humidity and mixing ratio differ?
Relative humidity indicates how near the air is to saturation, while mixing ratio shows the actual quantity of water vapor in the air.
How can you prevent the formation of a precipitate while mixing potassium nitrate and sodium chloride?
Add more water and stir.
Is wet concrete heavier then dry concrete?
Concrete is made of a mixture of cement, aggregate (small stones), fine aggregate (sand), water and other chemical additives. When mixed the wet concrete will remain so for Most people assume that set concrete has no water in it, this is not so, as the water content helps bond the aggregates and cement, this process is known as Hydration. Concrete with no water in it would crumble to dust. Adding more water to the mix will make a concrete that is easier to work, while less water will produce a stronger, more durable concrete. After initial setting of the concrete, a slow amount of water loss is expected due to the concrete drying, it can take anything up to a year for water to stop evaporating slowly out of the concrete. So for this reason the answer to your question is yes, dry, set concrete will weigh less than wet concrete, but for anything up to a year it will keep getting lighter, due to waterloss.
Why does methanol show an exothermic reaction with water at room temperature while it gives an endothermic reaction with water in cold conditions?
Methanol does not react with water. Mixing them is exothermic.
What is the function of gypsum in cement?
Gypsum is a mineral that contains up to 88% CaSO4.2H2O. this compound Calcium Sulphate dihydrate is responsible for retarding the setting time of cement. the action of Calcium Sulphate dihydrate is such that it inhibits the speed at which Calcite (C3S) molecules bind with water to set thus creating a cement that is workable.
How does mixing hot water and liquid nitrogen make 'thunder' popping noises?
As liquid nitrogen is chilled and at a temperature of -196 degrees centigrade , when that liquid nitrogen is added up with hot water then the particles of iquid nitrogen get heated up and then turn into vapour while this procees is going the sound occurs
What is the relative density of concrete?
Concrete has a relative density of 2.4 (although see the note below). Calculation of a relative density requires comparison to a reference material. Most commonly this is water. Water has a density of 1000 kg/m3 while concrete has a density of 2400 kg/m3. As such concrete is 2.4 times denser than water and so it's reference density is 2.4.
