Isolation of pervious concrete in the hydraulic structures of the Kaunas hydroelectric plant (Lithuanian SSR) by using polymer materials

Conclusions

• 1. To waterproof pervious construction joints and cracks having a separation of up to 0.5 mm, it is recommended to use strengthened glass fiber, as follows: one layer for heads of up to 15 m, two layers for heads between 15 and 30 m, and three layers for heads of over 30 m.

• 2. The waterproofing coating should be subjected to temporary back pressure produced by a pneumatic rubber cylinder or by a compression device transmitting the back pressure through a soft porous rubber packing. It is convenient to apply the waterproofing coating in 1000–1200-mm-wide strips with overlaps of not less than 100 mm.

• 3. For waterproofing wet concrete surfaces it is recommended to use a mastic epoxy coating applied without the pressure transmitted by a compression device, after removing the concentrated infiltration spots, by using strengthened waterproofing coatings.