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Diatomaceous earth as a partial replacement for portland cement in mortars - a review
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Over the last years, the increase in CO2 emissions into the atmosphere, its impact on climate change, and issues related to the sustainability and environmental impacts generated by the participation of the construction industry in global warming, have led to countless researches, several of them looking to modernize cement production with alternative binders. The most known alternative binders used nowadays in the construction industry are slag obtained in blast furnaces, metakaolin and fly ashes obtained from burning coal in thermoelectric power stations. In the present paper, due to diatomaceous earth’s pozzolanic properties, is researched the possibility of the use of diatomaceous earth as an alternative binder. This work shows a review of studies about introduction of raw and calcined diatomaceous earth in cement mortars, and the feasibility of using this material as a binder in cement mortars.
The different studies present that the introduction of different percentages of diatomaceous earth in mortars influences the physical and mechanical characteristics of the manufactured mortars. The tests performed in mortars with introduction of calcined diatomaceous earth show that the mechanical strength improves when compared to mortars manufactured with raw diatomaceous earth. The results of the compressive and flexural strength in mortars with introduction of calcined diatomaceous earth present lower values during the first 28 days, when compared with mortars without diatomaceous earth, however, there is a significant increase in the values of mechanical resistance, surpassing the values of mechanical resistance of mortars without diatomaceous earth at the end of 90 days. The water absorption by immersion tests also reveal that the increased introduction of diatomaceous earth increases the water absorption of the mortars.
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Magalhães, Leandro; Gavilán, Ana; Ferreira, Débora; Merelles, Samira (2024). Diatomaceous earth as a partial replacement for portland cement in mortars - a review. In 10th Euro-American Congress on Construction Pathology, Rehabilitation Technology and Heritage Managementt Rehabend 2024. Gijon. ISBN 978-84-09-58990-6