What If Concrete Is Too Wet?
In a specific ratio cement, sand, and stones are mixed for making dry concrete. After the mixing of water, it reacts with cement and forms a chemical reaction then forms a paste, which helps in binding the ingredients together.
With the passage of time the water starts evaporating out with the drying of concrete after it gains strength over a long period of time. This process is known as attaining the compressive strength of concrete. It takes nearly around 28 days for attaining complete strength.
A disaster can occur for intense structural projects such as footings and foundations that will require strong concrete. This is the reason why careful monitoring is to be done to the amount of water that is to be added and then mixed.
During the drying process if concrete gets more wet than required then it will lead to excess shrinkage. Due to which, the concrete gets prone to cracks which can be quite dangerous in due course of time for total rupture of structure.
There is a thumb rule present, with each inch of slump reduction of compressive strength of concrete occurring nearly around 500 psi. For heavy weight carrying need their occurs disasters. The ideal consistency can be known to be reached when it is not over ready if normal consistency is required.
Depending upon the grade of the concrete the quantity of different ingredients changes. Usually 10% of cement, 20% will be water, 30% of sand and 40% will be gravel. Each ingredient is very much essential for making proper concrete.
The consistency of mix and the type of ingredients used specify what will the concrete’s quality. Quikrete is a company that sells dry mixes. All the quality control and measuring are done by the company by us. The important thing you need to do is adding of water.
If the mix done at last has soup-like consistency, then dry mix is to be added for balancing things out. If the concrete brought by you from a plant is too wet required it is to be returned immediately. In that case losing a bit of time is much advantageous than putting too wet concrete to use.
In big projects there will surely be someone for inspecting the mix before it is to be poured. You should be cautious of the fact that masons and concrete companies will be adding extra water for making concrete to make the work easy for them. If you get to notice those things try to tell them to add extra dry mix for maintaining the consistency.
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Water when added to the powder starts chemically reacting and helps in forming a paste. Cement one of the ingredients, mixes and forms a bind with other ingredients finally after drying forms a strong concrete.
Curing is also very essential if you want your concrete to attain proper strength. Water is an extremely important ingredient, since without it a paste could not be formed. The concrete without water will remain dry and not result into a paste.
So, what is required is just right amount of water to help forming a standard consistent mix of concrete, not more than that neither less. If any ingredient remains dry then extra water can be added.
While if the concrete forms a soup like consistency, then it is not proper, the consistency should be like oatmeal a snowball can be formed with the concrete mix. The seeping of concrete through your hand signifies wet concrete. Extra water will lead to breaking, cracking, additional pores, and overall weakness.
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Cement is one of the active ingredients of concrete which helps in formation of bind and glues other ingredients together. Even though its portion is small but this is very essential. Without it concrete will remain a dry pile of stone and sand.
Water is the ingredient that helps in the activation of cement. Without concrete will be powdered material. While its quantity should be properly maintained, because excess water is not recommended neither less water is proper. Excess water will make concrete weak and less water makes it brittle.
Concrete being too wet, the excess water will evaporate that will lead the concrete to shrink and form crack. This forms the concrete weak and extremely porous.
- More grit is provided by sand. Binding is increased due to this ingredient.
- Stone gives strength to concrete, more usage of concrete PSI of concrete increases. Rounded aggregates give more strength.
Better interlocking property is given by angular aggregates.
- 1/2inch-1inch diameter aggregates are recommended to be used.
- Sand and gravels help in limiting shrinkage when concrete is being cured.
- With the variation of sand and gravel their occurs alteration of properties of your concrete.
When Concrete Gets Too Wet?
Concrete being too wet, concrete gets over porous and will lead to cracks. The excess water present will evaporate and result in escaping from the hardened concrete surface which leads to cracks and eventual breakage.
The strength of dried concrete reduces if your concrete is too wet. The compressive strength of concrete reduces up to 500 psi with the addition of extra inch in the slump. It is very much problem creating conditions for heavy load-bearing structures.
An essential concrete mix is required, it is not acceptable to get one batch different from the other batch. The dry ingredients and water should be properly measured and then mixed.
If by any mistake the water gets more than that required you should not throw the mix, it is recommended to add more dry mix unless you attain the required consistency.
But that is not always acceptable more often you need to start all over again by rejecting the initial mix. Concrete being porous absorbs water like sponge. Holding of excess water for a long time will lead to the formation of cracks and reduction in strength.
Concrete being too wet results them to be getting bigger pores. A good quality scaler is recommended for keeping the water out.
Highly wet concrete mix, badly proportioned and insufficiently mixed concrete generally undergoes bleeding. Bleeding results in the accumulation of water at the surface of concrete. Working up of the surface of concrete with floats and trowel, results in lowering of aggregate and cement and water to come up to the top surface.
“Laitance” is the word given to the cement paste formation at the surface. Owing to the fact the top surface will be having higher content of water and they get removed of aggregates, so therefore shrinkage cracks form.
If water cement ratio provided in your concrete is more than 0.7, the bleeding channels will be continuous in nature and remain unsegmented due to the development of gel. This bleeding channels will be responsible for the cause of permeability of concrete structure.
While the mixing water leads to come up, it may be blocked up by aggregates. The bleeding water leads to get accumulated below aggregates. This water accumulation leads to the formation of water voids and results in bond reduction between aggregates and pastes.
Bleeding rate increases with the passage of time up to near about one hour, then the rate starts to decrease but it not stops. It continues to occur until the final setting time of concrete occurs.
The bleeding is not totally harmful if the evaporation rate from the surface goes at par with the bleeding rate. After the role of water is done in workability, its removal from the concrete with the help of bleeding is perfect for the concrete.
After the concrete loses its plasticity, it is the delayed bleeding that causes harm to your concrete. The usage of proper material proportioning along with uniform mixing, usage of finely divided pozzolanic materials along with air entraining materials will help in reduction of the harmful bleeding.
Estimating the Water to Cement Ratio for Concrete
The strength of concrete is primarily dependent on cement paste strength. The paste strength increases with the increase in cement content while reducing with air and water content.
The lowering of water cement ratio can be used when the concrete is vibrated for achieving higher strength. Water cement ratio for getting the water required for chemical combination with cement and for occupation of gel pores if theoretically seen is about 0.38.
The higher water cement ratio can be used by us when you hand compact your concrete. If a graph is formed the relation between strength and water cement ratio will be hyperbolic in nature.
So, for getting the proper water cement ratio mixed design of concrete is to be done. Mixed design can be done in various methods such as American Concrete Institute Method of Mix Design, DOE Method of Concrete Mix Design, Indian Standard Concrete Mix Proportioning. Generally in India IS 10262:2009 is followed for getting the proper water cement ratio for your concrete.