Use of Fluidized Bed Combustion Ash and Other Industrial Wastes as Raw Materials for the Manufacture of Calcium Sulphoaluminate Cements

Marroccoli, Milena; Montagnaro, Fabio; Pace, Maria Lucia; Telesca, Antonio; Valenti, Gian Lorenzo

doi:10.1007/978-3-642-02682-9_167

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…Compared to the OPC manufacturing process, CSA cements exhibit the following environmentally friendly features: (I) reduced limestone requirement (usually <35%), and therefore less kiln thermal input and CO2 generation; (II) lower synthesis temperatures (about 150 °C-200 °C) and more friable clinkers (lower grinding energy required); (III) larger clinker dilution with additions of sulfate sources; (IV) greater use of industrial wastes, especially as kiln feed components [33][34][35][36][37][38][39][40]. To further decrease CO2 emissions, CSA cements can be blended with various SCMs and/or mineral additions [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60].…”

Section: Introductionmentioning

confidence: 99%

Use of Potabilized Water Sludge in the Production of Low-Energy Blended Calcium Sulfoaluminate Cements

2021

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Ordinary Portland cement (OPC) manufacture determines about 8% of the global anthropogenic CO2 emissions. This has led to both the cement producers and the scientific community to develop new cementitious materials with a reduced carbon footprint. Calcium sulfoaluminate (CSA) cements are special hydraulic binders from non-Portland clinkers; they represent an important alternative to OPC due to their peculiar composition and significantly lower impact on the environment. CSA cements contain less limestone and require lower synthesis temperatures, which means a reduced kiln thermal energy demand and lower CO2 emissions. CSA cements can also be mixed with supplementary cementitious materials (SCMs) which further reduce the carbon footprint. This article was aimed at evaluating the possibility of using different amounts (20 and 35% by mass) of water potabilization sludges (WPSs) as SCM in CSA-blended cements. WPSs were treated thermally (TT) at 700° in order to obtain an industrial pozzolanic material. The hydration properties and the technical behavior of two different CSA-blended cements were investigated using differential thermal–thermogravimetric and X-ray diffraction analyses, mercury intrusion porosimetry, shrinkage/expansion and compressive strength measurements. The results showed that CSA binders containing 20% by mass of TTWPSs exhibited technological properties similar to those relating to plain CSA cement and were characterized by more pronounced eco-friendly features.

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Section: Introductionmentioning

confidence: 99%

Use of Potabilized Water Sludge in the Production of Low-Energy Blended Calcium Sulfoaluminate Cements

2021

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“…In 2019, the cement production all over the world was equal to around 4.10 billion tons and its contribution to the anthropogenic carbon dioxide emissions was estimated to be as high as 8% [1][2][3]. With a growing focus on energy efficiency and sustainable production [4], technological advancements in cement production have revealed methods to reduce CO 2 emissions in the following ways: (a) more efficient manufacturing processes; (b) targeted use of non-traditional fuels and raw materials (e.g., non-carbonated CaO sources instead of limestone); (c) carbon capture and storage technologies [5]; (d) increased utilization of blended Portland cements; (e) further use of special hydraulic binders (such as alkali-activated and magnesium-based cements as well as calcium sulfoaluminate (CSA), belite and belite-calcium sulfoaluminate (BCSA) binders) [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Chemical Activators on the Hydration Behavior and Technical Properties of Calcium Sulfoaluminate Cements Blended with Ground Granulated Blast Furnace Slags

Marroccoli

Telesca

2021

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The manufacture of Ordinary Portland cement (OPC) generates around 8% of the global CO2 emissions related to human activities. The last 20 years have seen considerable efforts in the research and development of methods to lower the carbon footprint associated with cement production. Specific focus has been on limiting the use of OPC and employing alternative binders, such as calcium sulfoaluminate (CSA) cements, namely special hydraulic binders obtained from non-Portland clinkers. CSA cements could be considered a valuable OPC alternative thanks to their distinctive composition and technical performance and the reduced environmental impact of their manufacturing process. To additionally reduce CO2 emissions, CSA cements can also be blended with supplementary cementitious materials. This paper investigates the influence of two separately added chemical activators (NaOH or Na2CO3) on the technical properties and hydration behavior of four CSA blended cements obtained by adding to a plain CSA cement two different ground granulated blast furnace slags. Differential thermal-thermogravimetric, X-ray diffraction and mercury intrusion porosimetry analyses were done, along with shrinkage/expansion and compressive strength measurements.

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“…To reduce its carbon footprint, the cement industry is exploring how to manufacture OPC with less impact on the environment through a switch to: (I) alternative fuels, (II) reduction in thermal energy demand, (III) use of non-carbonated CaO sources instead of L, (IV) decrease in clinker to cement ratio, (V) application of carbon capture and storage technologies to cement plants [6], and (VI) development of low-CO 2 non-Portland binders (e.g., alkali-activated, Mg-based cements, calcium sulfoaluminate (CSA) and belite-CSA (BCSA) binders) [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Study of Eco-Friendly Belite-Calcium Sulfoaluminate Cements Obtained from Special Wastes

2020

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Belite-calcium sulfoaluminate (BCSA) cements are special binders obtained from non-Portland clinkers; they have become increasingly more important due to their environmental impact during the manufacturing process compared to Portland cements, such as lower energy consumption and CO2 emissions. The aim of this paper was to assess the possible use of titanogypsum (T) and water potabilization sludge (W) to reduce the amount of natural raw materials (natural gypsum and clay, respectively) used in the production of BCSA cements. Three BCSA clinker generating raw mixes, containing T and/or W, and a reference mix based only on natural materials (limestone, clay, bauxite and natural gypsum) were heated in an electric furnace at temperatures ranging from 1200 to 1350 °C. Quantitative X-ray diffraction (XRD) analysis of the burnt products showed high conversion of reactants towards the main hydraulically active BCSA clinkers components of C2S and C4A3$, particularly at temperatures of 1300 and 1350 °C. Isothermal calorimetric measurements, differential thermal–thermogravimetric and XRD analyses as well as porosimetric measurements showed that all BCSA cements, from mixing the clinkers (at optimum temperatures) with commercial anhydrite, exhibited similar hydration behavior.

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Use of Fluidized Bed Combustion Ash and Other Industrial Wastes as Raw Materials for the Manufacture of Calcium Sulphoaluminate Cements

Cited by 10 publications

References 8 publications

Use of Potabilized Water Sludge in the Production of Low-Energy Blended Calcium Sulfoaluminate Cements

Use of Potabilized Water Sludge in the Production of Low-Energy Blended Calcium Sulfoaluminate Cements

The Influence of Chemical Activators on the Hydration Behavior and Technical Properties of Calcium Sulfoaluminate Cements Blended with Ground Granulated Blast Furnace Slags

Study of Eco-Friendly Belite-Calcium Sulfoaluminate Cements Obtained from Special Wastes

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