Improving the Performance of Mortars Made from Recycled Aggregates by the Addition of Zeolitised Cineritic Tuff

Martín Sánchez, Domingo Alfonso and Costafreda Mustelier, Jorge Luis and Costafreda Velázquez, Jorge Luis and Presa Madrigal, Leticia (2022). Improving the Performance of Mortars Made from Recycled Aggregates by the Addition of Zeolitised Cineritic Tuff. "Crystals", v. 12 (n. 1); p. 77. ISSN 2073-4352. https://doi.org/10.3390/cryst12010077.

Description

Title: Improving the Performance of Mortars Made from Recycled Aggregates by the Addition of Zeolitised Cineritic Tuff
Author/s:
  • Martín Sánchez, Domingo Alfonso
  • Costafreda Mustelier, Jorge Luis
  • Costafreda Velázquez, Jorge Luis
  • Presa Madrigal, Leticia
Item Type: Article
Título de Revista/Publicación: Crystals
Date: 6 January 2022
ISSN: 2073-4352
Volume: 12
Subjects:
Freetext Keywords: Construction and demolition waste; zeolitised cinerite tuff; cement; mechanical strength
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Ingeniería Geológica y Minera
Creative Commons Licenses: None

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Abstract

Metropolitan construction and demolition waste (CDW) is currently an important source of recycled materials that, despite having completed their useful life cycle, can be reincorporated into the circular economy process (CEP); however, the recycling process is very selective, and waste material is not always fully satisfactory due to the intrinsic nature of the waste. This work aims to demonstrate and establish how to increase the effectiveness of the construction and demolition waste in more resistant mortars, by mixing it with zeolitised cinerite tuff (ZCT) at varying normalised proportions. To attain the objectives of this research, a series of tests were done: First, a chemical, physical and mineralogical characterisation of the CDW and the ZCT through XRF, XRD, SEM and granulometric methods. Second, a technological test was made to determine the mechanical strength at 7, 28 and 90 days of specimens made with Portland cement (PC) and mixtures of PC/CDW, PC/ZCT, and PC/CDW-ZCT. The results obtained through the characterisation methods showed that the sample of construction and demolition waste consisted of the main phase made of portlandite and tobermorite, and by a secondary phase consisting of quartz, ettringite and calcite; whereas the ZCT has a main phase of mordenite and a secondary phase of smectite (montmorillonite), amorphous materials consisting of devitrified volcanic glass, quartz and plagioclase. Mechanical strength tests established that specimens made with PC/CDW mixtures have very discreet compressive strength values up to 44 MPa at 90 days, whereas specimens made with PC/ZCT mixtures achieved a remarkably high mechanical strength consisting of 68.5 MPa. However, the most interesting conclusion in this research is the good result obtained in mechanical strength of the specimens made up of mixtures of PC/CDW-ZCT, which increased from 52.5 to 62 MPa at 90 days of curing; this fact establishes the positive influence of ZCT on waste in the mortar mixtures, which permits the authors to establish that the objective of the work has been fulfilled. Finally, it can be argued that the results obtained in this research could contribute to more effective use of construction and demolition waste in metropolitan areas.

More information

Item ID: 69430
DC Identifier: https://oa.upm.es/69430/
OAI Identifier: oai:oa.upm.es:69430
DOI: 10.3390/cryst12010077
Official URL: https://www.mdpi.com/2073-4352/12/1/77
Deposited by: Jorge Luis Costafreda Mustelier
Deposited on: 13 Jan 2022 08:14
Last Modified: 13 Jan 2022 08:14
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