Production of Belite Based Clinker from Ornamental Stone Processing Sludge and Calcium Carbonate Sludge with Lower CO2 Emissions

Ribeiro, Francisco Roger Carneiro; Modolo, Regina Célia Espinosa; Kulakowski, Marlova Piva; Brehm, Feliciane Andrade; Moraes, Carlos Alberto Mendes; Ferreira, Victor; Mesquita, Esequiel; Azevedo, Afonso Rangel Garcez de; Monteiro, Sérgio Neves

doi:10.3390/ma15072352

Cited by 7 publications

(1 citation statement)

References 54 publications

(61 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the development of low carbon binders able of replace ordinary Portland cement (OPC) is crucial to address the growing housing needs and decouple social development and well-being from climate change. Emergent binders with environmentally favorable profiles that are being intensely investigated include, among others, belite-rich Portland and belite ye'elimite-ferrite cements [7][8][9][10][11], magnesium-based cements [7], carbonation-hardening cements [7,12], calcined clay limestone cements [13][14][15][16], geopolymers, and alkali-activated materials [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the Synthesis of Alkali Activated Materials from Thermally Modified Clays

2022

Self Cite

View full text Add to dashboard Cite

The sustainability and economic competitiveness of alkali activation technology greatly depends on expanding the raw materials database with locally available resources. Therefore, a notable trend has been witnessed toward the exploitation of common clays as alternatives to well-established solid aluminosilicate precursors due to their availability and wide geographical distribution. However, common clays are complex and dedicated research is needed to tailor synthesis procedures and mix designs for different clay resources. This paper describes the outcomes of a study conducted to investigate the influence of several synthesis parameters (solid-to-liquid ratio, NaOH molarity, Si availability, and curing conditions) on the properties of alkali activated binders produced from different thermally modified clays. Optimal synthesis conditions for benchmark metakaolin systems have been identified and binders were produced with progressive dosages of metakaolin replacement by common local clays. Fundamental physical and mechanical properties such as apparent density, open porosity, water absorption, and compressive strength were examined at different curing ages, and X-ray diffraction (XRD) was used to provide complementary mineralogical insights. By combining the effects of the parameters studied, mortar specimens were produced with the developed binders, reaching compressive strength values exceeding 28.2 ± 0.1 MPa, a bulk density as low as 1.78 ± 0.0 g/cm3, and open porosity and water absorption values lower than 15% and 8%, respectively. These properties are comparable to those of conventional hydraulic products, which presents them as interesting candidates for construction. Ultimately, this work aims to contribute with valuable insights toward the valorization of a large group of unexploited clay precursors by demonstrating the feasibility of producing technologically competitive alkali activated materials with little or no use of the prime precursors, thus adding to the extant knowledge and contributing to future scientific and industrial developments in this field.

show abstract