Abstract

MEJIA-BARRERA, Carlos Alberto; SIERRA-ARANGO, Luis Javier; ARBOLEDA-LOPEZ, Sergio Andrés  and  ZULUAGA-DE LOS RIOS, Ubany de Jesús. Technical Evaluation of the Cementing Potential of Clays Obtained from Construction and Demolition Waste. TecnoL. [online]. 2021, vol.24, n.52, pp.84-109.  Epub Feb 21, 2022. ISSN 0123-7799.  https://doi.org/10.22430/22565337.2038.

This paper aims to technically evaluate the cementing potential of clays obtained from Construction and Demolition Waste (CDW), as well as from ceramic brick, ceramic tile, and sanitary ware waste in terms of metakaolin, by partially replacing Portland cement with each of the materials recovered from CDW. First, CDWs were collected and subjected to primary and secondary crushing to reduce their size. Then, they were finely milled until a powder with a granulometry similar to that of Portland cement was obtained. When preparing the cementitious matrix, the cement was gradually replaced with the clays derived from CDW and metakaolin until mixtures with a better compression strength performance were obtained in accordance with Colombian Technical Standard 220 (abbreviated NTC 220 in Spanish). Afterward, standardized sand was added to the mixture to make concrete cylinders. Finally, the partial substitutions of Portland cement by clays as cementitious material were subjected to petrography tests and X-ray fluorescence and diffraction. During these tests, similar chemical substances, such as portlandite and calcite, were observed. These substances could become a potential cementing agent in ceramic tile and sanitary ware clays from CDW once the cementing phases of the materials used are identified. The results suggest that clays from CDW can be employed as fillers to improve the mechanical properties of concrete or as aggregates in mortars or plasters.

Keywords : Environment; nonrenewable resources; cements; waste recycling; excessive exploitation; construction and demolition waste.

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