Concrete Construction

Effect of water exceed in concrete

Excess Water in Concrete Mix

Concrete Mix with all proper quantity proportions. mixing all material with water is an essential component when making the best strength concrete. Water level proper and the moisture that water provides also gives concrete its strength during the curing process. The effects of too much mixing water result in the Segregation of the concrete mix under certain conditions resulting in variable quality throughout the concrete mass. with detailed Cracking methods with too much water, there will be lower tensile strength and gives lower compressive strength and a tendency towards high shrinkage and subsequent cracking systems.

While water is one of the most important ingredients in concrete, it can also be the most destructive in excessive amounts. as simple states, excess water bleeding up the sides of forms washes out cement paste and leaves an unsightly streaked surface. As one of the most common building materials used in construction, Sufficient water levels in mixing appropriate concrete drying solutions are necessary to ensure concrete strength and safe construction.

voids left as excess water evaporates invite water to seep through walls and floors and costly repairs, or in extreme cases, demolition and re-building at contractor’s expense will make sure gives best additional benefits for all structures. when doubting with mix, concrete requires proper compaction using correct equipment and techniques. Moisture Affects Concrete Strength and its Increased space between cement grains. slump concrete or special placement conditions exist consult Holcim Technical staff for advice about mix designs.

Higher water-to-cement ratios result in greater spacing between the aggregates in cement, which affects compaction. major problems facing while waterlevel increasing, bleeding of excess water brings too many fines to the surface of floors. Increased moisture levels reduce the concrete’s compressive strength and durability. damage to concrete structures due to excessive water in a concrete mix is very common facing issues for a construction sites.

Check: Mortar Mix Ratio

Effects of Excess Water in Concrete Mix

  • Drying shrinkage
  • Dusting and scaling
  • Increase in permeability
  • Loss of abrasive resistance
  • Strength Reduction
  • Reduced durability

As concrete’s surface area increases, it will get compressive strength best results, particularly with the addition of fine aggregates, so does the demand for water. The increased water leads to a higher water-to-cement ratio. Strength Reduction for Major properties. Compressive strength is one of major property of concrete and the excessive quantity of water reduces the compressive strength of concrete. When excess water creates greater spaces between aggregate materials, the voids fill with air after the moisture evaporates.

Read also: Design of RCC Slab Roof

Compressive Strength:

Compressive strength is at peak, when water to cement ratio is low. Beginning of the curve depends on the available means of compaction (that is either done with vibrators or manually hand compaction). If large size aggregates is used with low water to cement ratio and high contents of cement then it exhibit retrogression of the concrete strength. A conclusion can be made that if there is a low water to cement ratio in a fresh mix than after hardening, water/cement will not be able to lead higher strength of concrete.

Read: Types of Concrete Shrinkage 

pH levels: Relative humidity levels and pH in concrete are directly related. As humidity levels increase, so does the concrete’s pH and temperature. As pH levels in concrete increase, the more likely floor covering adhesive bonds will fail. While higher temperatures allow concrete to dry faster, it results in a less structured, more porous product.

Water containing bicarbonate ions and carbon dioxide cause a reaction known as carbonation in concrete. Chemical admixtures with properties The strength of concrete increase by decreasing the water cement ratio and vice versa the strength decrease by increasing the water-cement ratio. This often happens in the presence of salts and acid rain. As the acidic substances lower the concrete’s pH, the calcium carbonate within the aggregates dissolves and reduce the concrete’s strength. Eventually, the concrete will crumble into sand and rock. must take precaution while adding water, Some water containing a small amount of sugar would be suitable for drinking but not for mixing concrete and conversely water suitable for making concrete may not necessarily be fit for drinking.
Quora Question: What happens if more water is added to concrete?

Read: Concrete Crack Repair Methods

If the w/c ratio is high, a large amount of water is available per unit weight of cement in the concrete mix. So if a fixed volume of concrete is poured into a cube of form-work, there are a large number of water-filled voids in the cube. Adding more water to concrete starts bleeding, which means the cement present in concrete flows off or the mix of concrete gets segregated which makes it weak and affects strength, cement slurry gets washed off during placing of concrete.

So when the hydration reaction starts on the surface of the cement particle, the gel-like products of hydration get precipitated in the water – away from the surface of cement particles. Excessive impurities in mixing water not only may affect setting time and concrete strength, but also may cause efflorescence, staining, corrosion of reinforcement, volume instability, and reduced durability.

Source: Quora

Question Related Water Cement Ration Moisture.

Increase in the moisture content in concrete
A. reduces the strength
B. increases the strength
C. does not change the strength
D. all of the above

Answer: Option A

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