Surkhi

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English: :Trass well known in India surkhi is used as substitute for sand for concrete and mortar, and has almost the same function as of sand but it also imparts some strength and hydraulicity. Surkhi is made by grinding to powder burnt bricks, brick-bats or burnt clay.When clay is especially burnt for making into surkhi, an addition of 10 to 20% of quick-lime will improve its quality.

español: :Puzolana, arcilla calcinada usada en India como mortero o hormigón.