In the 1990s, to investigate the use of roads and bridges have been built situation showed cracks in concrete bridge decks, seepage cause steel corrosion is a key factor affecting the service life of bridge; concrete deck is mainly due to seepage concrete deck pavement produced during the construction and completion of the operation of the crack, crack, which in recent years more concrete deck pavement designed for waterproof concrete, the same intensity level and the slab.

Compares concrete bridge deck waterproofing

Achieve concrete waterproofing function is generally in two ways:

(1) Concrete cement concrete with an appropriate increase per unit volume than the minimum amount of cement, mixed with bulking agents or ultrafine active admixture, use air-entraining admixtures and other measures to improve its own solidity of concrete ways to achieve concrete waterproofing requirements;

(2) increasing the concrete pavement outside the waterproof layer, after the concrete has reached a predetermined strength coated with a waterproof, penetrate the concrete surface closed the gap function of film waterproof layer.

But through the practical application of both methods there are many problems, it does not make the bridge deck pavement leakages has been significantly improved, the former due to increased unit amount of cement concrete results in shrinkage and shrinkage of hardened concrete temperature increases, adding bulking agents or super fine active admixture for concrete pouring construction and maintenance have higher requirements, the surface area of ​​a large concrete in bridge construction, maintenance work itself is relatively weak link, along with the hardened concrete pavement, minor cracks may still appear from time to time even increase, some develop into crack cause Deck produce leakages in the future use operation; the latter due to the smaller waterproofing membrane thickness, the actual penetration depth shallower cracks in concrete waterproof closure principle to be verified, and the actual results poor.

Since the mid-1990s, China began its research on indoor test polymer fiber concrete has made abundant achievements, including good crack polypropylene fiber reinforced concrete, impact performance is especially suitable for use as a bridge deck pavement.

A sheet of polypropylene fibers were bundled, mixed concrete single Cambodian fiber was stirred, in concrete aggregate impact dispersion into a network while adhering more cement mortar, cement mortar adhesion with stirring mesh is the aggregate impact torn into single filament or multi filament fibers are uniformly dispersed in the concrete; early in the concrete to harden, polypropylene fibers due to low elastic modulus, elongation at break elongation at break greater than concrete, plays a bridging in concrete action, inhibit new pouring concrete settlement, dehydration shrinkage and thermal stress cracks, fractures, can block the capillary water evaporation channel, reducing the bleeding rate of concrete, improve the impermeability of concrete; in hardened concrete fibers remission concrete local stress concentration, reduce the production of early fatigue cracking of concrete, improve impact resistance, impermeability of concrete, improve the brittle fracture characteristics of concrete. As a new concrete bridge deck pavement waterproof overall method, polypropylene fiber reinforced concrete is rapidly design side, the construction side of the recognition. More theoretical research and laboratory test results of polypropylene fiber reinforced concrete to obtain a better application in a number of projects.

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