The waterproofing of a Bridge Deck paved with Asphalt (Tarmac) is one of the most challenging waterproofing in civil engineering. It must prevent water ingress and offer mechanical resistance to long-term vehicular traffic.
💎Bridge Deck Waterproofing Using Bitumen Membrane
The system utilizes a single-ply membrane with the leak resistance. A membrane is made from extremely flexible SBS-modified bitumen and has a non-woven polyester reinforcement.
The upper side is self-protective with the ceramic granules; the overlap is ended up with a 10-cm polypropylene tissue. The lower side of the membrane is ended up with a polypropylene movie. The reinforcement is totally fertilized with SBS finishing. The homogeneity in between substance and impregnation-mixture offers the membrane it’s very high resistance versus the delamination.
- Increased resistance to breaking
- Exceptional adhesion on hydraulic concrete
- Easy to bond
- Concrete Surface:
The concrete deck will be complying with appropriate suitable requirements. The concrete surface should be at least 2 weeks old prior to beginning the waterproofing works. The surface should remain in excellent condition, suggesting that it needs to be tidy, smooth, and even, with no holes and spaces.
- Surface Preparation:
Before using the guide, examine the condition of the bridge deck surface:
Checking the areas of hydrocarbon
Checking if all dust, dirt, soil, clay, and cement sauce has actually been eliminated.
Thoroughly tidy the surface, e.g by atmospheric pressure
Verifying that the surface is well dry
Checking for the spaces, holes, cavities
- Membrane Installation
Apply the guide with rollers, brushes, or spaying tools. Normally it takes about 2 hours for the guide to dry.
Membranes are presented, lined up, and the rolled-up once again for about ½ of their length. The membrane is bonded totally on the surface by use of the high capability torches. Immediately the membrane is thoroughly pushed to the surface by the use of an iron roller to avoid the addition of air in between the membrane and the surface. Make sure the cross-directional overlaps are staggered. The width of the horizontal overlaps ought to be at least 12cm. The longitudinal overlaps ought to be 10cm.
Asphalt Wearing Course: Bridge Deck Waterproofing
Asphalt using course is put the straight on the waterproofing. The minimum density is 5cm after condensing. The temperature level of the asphalt might not surpass 180 Celcius degrees at putting. During condensing the temperature level not surpass 160 degrees. Only trucks and lorries included with the asphalt using course are allowed to bridge deck location. The professional needs to make sure not to harm the membrane.