Properties of fresh and Hard Concrete , Concrete Engineering

Properties of fresh and Hard Concrete

Fresh  Concrete

Fresh concrete, a time period used to indicate lately mixed concrete in a plastic or plausible country. Typically serves construction projects requiring molding or shaping for specific forms or structures, consisting of constructing foundations, walls, columns, and beams.

The composition of sparkling concrete usually entails a mixture of cement, water, aggregates (such as sand and gravel), and once in a while extra substances like admixtures or additives. After blending, the construction web page receives the concrete, and it gets poured into formwork or molds to accumulate the favored form.

While in its fresh state, concrete remains malleable, permitting smooth molding or shaping as required. Properly dealing with the position, compaction, and curing of clean concrete is crucial to ensure the improvement of the preferred strength and durability through the years.

Fresh concrete commonly continues a plastic kingdom for a quick period, normally around 1-2 hours, before it initiates the setting and hardening process. Beyond this time-frame, the concrete ceases to be clean and is reclassified as hardened or cured concrete.

Properties of Fresh Concrete

Concrete is referred to as fresh when it has lately been combined and remains in a plastic, practicable state. Here are some of the homes of clean concrete:

  1. Workability: Workability describes the ease with which you’ll location, compact, and finish concrete. Fresh concrete need to have exact workability. this means that that it have to be easy to mix, transport, and vicinity with out segregation or bleeding.
  2. Consistency: Consistency refers to the degree of wetness or dryness of the concrete. Fresh concrete have to have a consistency this is appropriate for the specific software. It should be able to flow and fill the formwork without segregating.
  3. Setting time: The putting time of sparkling concrete is the time it takes for the concrete to harden and develop its preliminary strength. This time can vary relying on factors including temperature, blend layout, and admixtures. It is vital to screen the setting time to make certain that the concrete does now not set too speedy or too slowly.
  4. Temperature: The temperature of clean concrete can affect its homes, along with placing time and workability. Place and cure concrete within a temperature range suitable for the specific mix design.
  5. Air content material: Fresh concrete need to include a appropriate quantity of entrained air to ensure that it is durable and resistant to freeze-thaw cycles. Monitor the air content and adjust it as necessary.
  6. Bleeding: Bleeding is the separation of water from the mixture, ensuing in the accumulation of water on the floor. Design clean concrete to limit bleeding, as it could impact the floor end and basic satisfactory of the concrete.

Overall, fresh concrete should have the appropriate properties for the specific application and meet the required specifications and standards.

Hard Concrete

When the concrete mix has fully set, it is called hardened concrete.

Properties of Concrete 

Hardened concrete is a robust and sturdy fabric with a variety of houses that make it suitable for a extensive variety of production programs. Here are a number of the homes of hardened concrete:

  1. Compressive Strength: Hardened concrete has wonderful compressive power, which refers to its potential to resist crushing beneath a heavy load. The compressive strength of concrete usually will increase over time because the concrete healing procedures. And the chemical response among cement and water produces a stronger cloth.
  2. Tensile Strength:   Hardened concrete has a restrained ability to withstand being pulled apart or stretched. as it demonstrates incredibly low tensile energy. Howеvеr and it is quitе possiblе to incrеasе thе tеnsilе strеngth of concrеtе by using rеinforcеmеnt including stееl framеs and thеrеby rеducing thе risk of cracking or failurе.
  3. Durability: Curеd concrеtе is еxcеptionally durablе and can withstand a widе rangе of еnvironmеntal and strеss conditions. Howеvеr and factors including moisturе contеnt and frееzе thaw cyclеs and and chеmical composition can influеncе thе durability of concrеtе.
  4. Hardness: Cured concrete is a strong and flexible fabric. Its making it suitable for the load applications of foundations, bridges and roads.
  5. Abrasion resistance: Cured concrete has adequate abrasion resistance. Which means that it can withstand damage from pedestrian spectators, vehicle spectators and other road users.

Read More

Determine the bleeding test of Concrete 

Flow table test on fresh concrete to Measure the Workability

Determine the Unit Weight of Concrete Test

Tests on fresh and hard concrete List 

Concrete Temperature Measurements and Limits

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