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Raw Material Arrangements-Water for Construction

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Raw Material Arrangements-Water for Construction

Water is one of the most important elements in construction but people still ignore quality aspect of this element. The water is required for preparation of mortar, mixing of cement concrete and for curing work etc during construction work.

Quality of Water

The water used for mixing and curing should be clean and free from injurious quantities of alkalis, acid, oils, salt, sugar, organic materials, vegetable growth and other substances that may be deleterious to bricks, stone, concrete or steel. Potable water is generally considered satisfactory for mixing. The pH value of water should be not less than 6. 

Effects of Bad Quality Water on Cement Concrete

It has been observed that certain common impurities in water affect the quality of mortar or concrete. Many times in spite of using best material i.e. cement, coarse sand, coarse aggregate etc. in cement concrete, required results are not achieved. Most of Engineers/Contractors think that there is something wrong in cement, but they do not consider quality of water being used. Some bad effects of water containing impurities are following.

  • Presence of salt in water such as Calcium Chloride, Iron Salts, inorganic salts and sodium etc. are so dangerous that they reduce initial strength of concrete and in some cases no strength can be achieved. There is rusting problem in steel provided in RCC.
  • Presence of acid, alkali, industrial waste, sanitary sewage and water with sugar also reduce the strength of concrete.
  • Presence of silt or suspended particle in water has adverse effect on strength of concrete.
  • Presence of oil such as linseed oil, vegetable oil or mineral oil in water above 2 % reduces the strength of concrete up to 25 %.   
  • Presence of algae/vegetable growth  in water used for mixing in cement concrete reduce of the strength of concrete considerably and also reduce the bond between cement paste and aggregate.

Treatment of Water

It is advisable that water should be tested in lab and if found unsatisfactory, it should be treated according to directions of laboratory. It is generally observed that ground water has some quantities of salt. In case of small work or in a situation where good water is not available, salty water must be treated with HCL @ 10 ml for 100 liters of water.

Quantity of Water

Water is an important component for mortar or concrete. The quantity and quality of water have much effect on the strength of mortar and cement concrete. It has been observed many times that in spite of using best raw materials, cement and tested water; concrete does not provide required results.  Engineers/contractors think that there is something wrong in cement, but they do not consider water cement ratio or quantity of water added in the mix.

When the water is mixed in mortar, it reacts with cement and forms a binding paste which fills small voids in the sand. This creates a close cohesion of sand particles and cement. In case of cement concrete the voids formed between sand and coarse aggregate gets filled with the paste forming a cohesive substance/concrete. The required quantity of water is used to prepare mortar or concrete, but in practice it is seen that more water is mixed to make the mix workable. This is a bad practice and additional water weakens the strength of cement paste. Extra water also weakens adhesive quality.

Main disadvantages of mixing too much water in mortar and concrete

  1. The water occupies space in sand and it evaporates to create voids. Moreover the water voids will be more and this will reduce the density, strength and durability of mortar or concrete.
  2. When more water is used in concrete excess water brings a mixture of excess cement paste with water floating on the surface. This material forms a thin layer of chalky material on the surface which reduces proper bonding with second layer of cement concrete in case of water tank and dams etc. This will affect the strength of concrete.          
  3. When more water is used, the cement slurry starts coming out from from cement concrete mix. The excess slurry formed by water and cement comes out through shuttering joints. This makes concrete of less cement and reduces the strength of concrete.
  4. When more water is used, proper compaction is not achieved and there is bleeding, large voids and more shrinkage, less durability and less strength.
  5. When more water is mixed in cement concrete, the problem of segregation of material is faced at the time of laying the mix. As a result Coarse Aggregate and cement paste separate from each other. 

Hence strict control should be kept on water cement ratio for preparing the mortar or concrete for qualitative finish/ strength.

Quantity of Water for One Bag Mix

  • Approximate 32 liters of water is required where the ratio 1:2:4 of cement concrete is used.
  • Approximate 30 liters of water is required where the ratio 1:1.5:3 of cement concrete is used. 

Water for Cement Concrete

  • Water for ordinary cement concrete mix should be equal to 5% by weight of aggregate and 30% by weight of cement.  
  • The actual quantity of water required to be added in the field depends on availability of aggregate and surface water present in the aggregate.
  • It should be calculated by slump test.
  • Generally for vibrated concrete the quantity of water is less by 20%.

Water Reducing Admixtures 

The water reducer admixture improves workability of concrete/mortar for the same water cement ratio. The determination of workability is an important factor in testing concrete admixture. Rapid loss of workability occurs during first few minutes after mixing concrete and gradual loss of workability takes place over a period from 15 to 60 minutes after mixing. Thus relative advantages of water reducing admixture decrease with time after mixing. These admixtures increase setting time by about 2 to 6 hours during which concrete can be vibrated. This is particularly important in hot weather conditions or where the nature of construction demands a time gap between the placements of successive layers of concrete.


  • It can reduce 10% of water consumption.
  • It can improve mixture of cement concrete for workability.
  • Compression strength improves by more than 15 %.
  • It can reduce initial stage of cement heat hydration by large margin.
  • It has no function of corrosion reinforcing bars.
  • It increases workability, density and strength without increasing the quantity of cement.

Hence in the area where there is less availability of water and the water is carried from long distances for construction work, the water reducing admixture is most beneficial for cement concrete work as it saves water up to 10%. It also increases the strength of cement concrete with the same quantity of cement.