VSM / Application / Concrete and ferroconcrete structures and products

Concrete and ferroconcrete structures and products

Floor slabs, wall panels, cross-bars, staircases, supports, piles, pipes, trays, rings, refuse collectors, monolithic frames, envelop structures, etc.

One of the most common defects in ferroconcrete structures and items are cracks and faulty surfacing. Besides, cracks often cause destruction of products and structures due to lower concrete strength.

Prevention of cracking at early stages ensures maximum possible strength, durability, and flawless appearance of the product.

There are different ways to impart strength and prevent shrinkage cracking: steel reinforcement, steam curing, careful selection of components, application of various additives to reduce water content and increase plasticity, as well as some others. None of the abovementioned ways are capable of 100% cracking prevention.

Steel reinforcement comes to life once the cracks have occurred – it keeps the structure from further destruction; additives affect only one property of the concrete mixture (segregation, freezing temperature, time of hardening, increased strength, increased plasticity, etc.), while their combined application leads to significant increase in cost of concrete. The basic solution is in close adherence to the production technology, operating practices, formulation, quality control of the raw materials, their storage conditions, etc. Nevertheless, it is quite possible that chemical activity and grain size of the supplied binding material and aggregates will not correspond to declared, and the production process stability cannot be 100% guaranteed. That is where VSM offers an efficient solution.

Advantages of application of VSN in ferroconcrete products and structures:

  • shrinkage cracking is eliminated;
  • increased compression and tensile strength;
  • significantly increased resistance to impact and vibration load;
  • increased wearability;
  • increased fire-resistance (fiber burns down at high temperature, forms almost no ashes, while forming minute vessels, thus letting the steam out and reducing the possibility of explosive chipping-off);
  • improved freeze-thaw resistance and water tightness.

Economic efficiency:

  • reduced number of defects losses during demolding;
  • less steel reinforcement required;
  • increased turn round of molds and higher labour efficiency;
  • possible concrete mix saving;
  • a substitute for more expensive additives.

Recommendations for application of VSM:

Recommended fiber length: 12 and 18 mm. Fiber length depends on the thickness of concrete lining and fractional content.

Content of VSM in the mixture depends on the goals to be achieved. Approximate recommended content is as follows:

  • 0.6 kg of VSM per 1 m3 of concrete mixture is to be added to prevent shrinkage cracking;
  • 0.9 kg of VSM per 1 m3 of concrete mixture is to be added to make floors more durable and eliminate cracking.

Fiber length and optimal dosage for a certain type of concrete and its application can be defined individually through comparative testing.

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