Waterproof concrete Burial Chambers

What’s the difference between waterproof concrete and conventional concrete?

Ordinary concrete contains fine pores which allow moisture to penetrate the surface and pass through. The size and volume of these pores is dictated by the water/cement ratio; the higher the ratio, the more porous the concrete. For welters® waterproof chambers the concrete pores are filled to create high density ensuring a watertight concrete.

Special concrete admixtures make the concrete watertight. One waterproofing admixture reduces the water/cement ratio, increasing the density of the mix and minimising the size of the pores. The second waterproofing admixture fills the remaining pores ensuring a completely watertight finish.

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