Sarooj

Sarooj is a traditional water-resistant mortar used in Iranian architecture,[1][2] used in the construction of bridges,[3] and ice pits or earth refrigerators (yakhchal).[4]

It is made of clay and limestone mixed in a six-to-four ratio to make a stiff mix, and kneaded for two days . A portion of furnace slags from baths are combined with cattail (Typha) fibers, egg, and straw, and fixed, then beaten with a wooden stick for even mixing. Egg whites can be used as a water reducer as needed.

References

Peter Jackson (1975). A Windtower House in Dubai. Art and Archaeology Research Papers. p. 8.
Bernhard Glaeser (5 September 2013). Learning From China?: Development and Environment in Third World Countries. Routledge. pp. 227–. ISBN 978-1-136-88103-9.
Changkuan Zhang; Hongwu Tang (28 July 2010). Advances in Water Resources & Hydraulic Engineering: Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS. Springer Science & Business Media. pp. 994–. ISBN 978-3-540-89465-0.
The Earth Refrigerators as Earth Architecture at IJESD.org

Old Materials and Techniques to Improve the Durability of Earth Buildings

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[Jackson1975-1] Peter Jackson (1975). A Windtower House in Dubai. Art and Archaeology Research Papers. p. 8.

[Glaeser2013-2] Bernhard Glaeser (5 September 2013). Learning From China?: Development and Environment in Third World Countries. Routledge. pp. 227–. ISBN 978-1-136-88103-9.

[ZhangTang2010-3] Changkuan Zhang; Hongwu Tang (28 July 2010). Advances in Water Resources & Hydraulic Engineering: Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS. Springer Science & Business Media. pp. 994–. ISBN 978-3-540-89465-0.

[4] The Earth Refrigerators as Earth Architecture at IJESD.org