Polypropylene fiber can improve the function of concrete cracking, what are the reasons?

Polypropylene fiber can improve the function of concrete cracking, it is why? You want to know the reason it? Want, then come onlookers it!

The primary reason for the seizure of three concrete cracks: Cracks external load direct result of stress, the stress that is the primary cause of cracks in the customary accounting; under the effect of external load, stress causes cracks program times: the cracks resulting from the deformation, such as temperature, shortening and swell, causing differential settlement cracks and other factors. Cracks generally consists of one or several elements together during effect constitute, and elements of the three episodes of the crack, especially crack causing the most deformation changes, accounting for more than 80%.

To travel to prevent cracking of concrete, steel may be appropriate to increase the allocation plan, but this approach only to resist external load stress causes cracks as useful, while about a third crack, especially the plastic to shorten the crack alone is reinforced with a plan effective difficult, because the steel is difficult to fine spread, while polypropylene fibers can compensate deficient in this regard. When properly incorporated polypropylene fibers in concrete after, because polypropylene fibers and cement-based aggregates have a strong binding force, capable of active and easily mixed with concrete data, spread evenly and fine.

Polypropylene fiber in control of concrete cracks in the plastic shortening the primary effect of: retarding the onset of plastic shortening and bundling crack crack open. Plastic concrete cracking concrete to harden before the first attack, especially within 4-5 hours after the pouring of concrete, this time because of moisture transpiration and handling, interior concrete tensile strain talent shortens attack less than a plastic strain and therefore cause Plastic Cracks in concrete attack.

And after the incorporation of polypropylene fibers, polypropylene fibers as evenly spread, played a similar screen effect, slowing the cracks because of the rapid onset of coarse aggregate loss, delay the first cracks in the plastic shortening presented moment.

When the cracks showing the presence of polypropylene fibers also makes crack open the top were tied, cracks can bypass the fiber or the fiber pull-off to continue the open, which needs to spend immeasurable energy to defeat the fiber bundle to crack open effect, the greater the fiber volume content, the stronger the effect of such bundling. In general cracks in the concrete top not been such bundling effect, can freely open, which makes general concrete cracks than participate fiber concrete cracks wider, longer. Plastic shorten concrete crack area, the maximum crack fracture width and water loss rate increases were followed by the fiber volume content significantly decreased, indicating polypropylene fiber function usefully traveled cracking concrete.

In addition, the effect of polypropylene fibers and refined crack crack resistance, and significantly improved the cement's plan to make cement microcracks natively cut, crack width is reduced, it must make the impermeability of the hardened cement and patience a considerable degree of travel.

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