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Concrete sealers are applied to concrete to protect it from surface damage, corrosion, and staining. They either block the pores in the concrete to reduce absorption of water and salts or form an impermeable layer which prevents such materials from passing.
Later construction often used concrete to fill the cutoff trench. [ 3 ] To make puddle, clay or heavy loam is chopped with a spade and mixed into a plastic state with water and sometimes coarse sand or grit to discourage excavation by moles or water voles .
Pond liners need to be protected from sharp objects (for example, stones) below the liner and from being punctured by any objects in the water body. Protection can be provided with layers of sand, geotextiles (particularly needle-punched nonwovens) and other materials. Pond liners are manufactured in rolls or accordion-folded on pallets.
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Hydrophobic systems use concrete sealers or even fatty acids to block pores within the concrete, preventing water passage. Sometimes the same materials used to keep water out of buildings are used to keep water in, such as a pool or pond liners .
Underwater use of hydrophobic concrete is a major application in marine facilities. Is often used to hold water to create pools and ponds. NASA used hydrophobic concrete to build the swimming pool used to train astronauts for walking on the Moon. Hydrophobic concrete is also used in applications that are exposed to rain or rain puddling, such ...