scholarly journals Nano CaCO3 particles in cement mortars towards developing a circular economy in the cement industry

2020 ◽  
Vol 26 ◽  
pp. 155-165 ◽  
Author(s):  
Isabella Cosentino ◽  
Freddy Liendo ◽  
Mara Arduino ◽  
Luciana Restuccia ◽  
Samir Bensaid ◽  
...  
Keyword(s):  
Circular Economy ◽  
Cement Industry ◽  
Cement Mortars

Non-Destructive Tests as Durability Indicators in Cement Mortars with Pozzolanic Substitutions

2017 ◽  
Vol 902 ◽  
pp. 9-13
Author(s):  
Rosalía Ruiz Ruiz ◽  
Elia Mercedes Alonso Guzmán ◽  
Wilfrido Martínez Molina ◽  
Hugo Luis Chávez García ◽  
Judith Alejandra Velázquez Perez
Keyword(s):  
Mechanical Characteristics ◽  
Ultrasonic Pulse Velocity ◽  
Good Alternative ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Cement Industry ◽  
Capillary Absorption ◽  
Pozzolanic Material ◽  
Cement Mortars ◽  
Non Destructive

Cement industry is responsible of 5-7% of CO2 emissions to the atmosphere. This is preoccupant because this is one of the greenhouse effect gases which cause global warming. Pozzolanic material incorporation in cement mortars elaboration represents a good alternative to partially substitute cement, since its chemical composition could contribute to improvement of its durability and mechanical characteristics. In this research, mortars with pozzolanic substitutions are evaluated through non-destructive tests as: capillary absorption, electrical resistivity, and ultrasonic pulse velocity to the age of 1000 days. The results suggested that the incorporation of pozzolanic material as partial substitutes of Portland cement increases the mortars properties mainly in substitutions of CBC 20%, PN 10, and 30%.

scholarly journals Blast Furnace Slag Disposal Problems in the Context of the Transition to a Circular Economy

2021 ◽  
pp. 129-145
Author(s):  
V. Lepa ◽  
◽  
O. Prohnymak ◽  
Keyword(s):  
Blast Furnace ◽  
Circular Economy ◽  
Blast Furnace Slag ◽  
Metallurgical Industry ◽  
Industrial Sector ◽  
Cement Industry ◽  
Raw Material ◽  
The Creation ◽  
Slag Processing ◽  
Furnace Slag

The problem of the accumulation of waste from the metallurgical industry in Ukraine, in particular, blast furnace slag, has an economic and environmental component. Therefore, the main problems, first of all, include the absence of a criterion for the greening of the industrial sector among the priorities of Ukraine's economic policy. The article examines the situation in the slag industry of Ukraine, summarizes the existing experience of using metallurgical slags as technogenic raw materials. The problems of introducing a circular economy in the territory of intensive development of the metallurgical industry are considered primarily in the context of creating a flexible infrastructure for processing metallurgical waste, because the problem of waste is at the center of attention of the entire circular economy. But such an infrastructure cannot be created without overcoming the technological, economic, and institutional problems of utilizing blast-furnace slags in Ukraine, which hinder the creation of a slag processing industry on the principles of a circular economy. Based on the assessment of macroeconomic and environmental effects from the introduction of elements of a circular economy in the domestic metallurgical industry, the resource value of blast furnace slags as a technogenic raw material for the construction industry, in particular the cement industry, as well as road construction and other areas of use, has been proved. The ways of solving the economic and institutional problems of slag processing at the macro-, meso- and microeconomic levels are given, proposals are made to improve the legal framework for the development of the circular economy, the participation of the state, local authorities and business in the creation of a domestic industry for the processing of blast-furnace slag.

The Circular Economy-Oriented Practice in the Cement Industry

2016 ◽  
pp. 123-142
Author(s):  
Jianguo Qi ◽  
Jingxing Zhao ◽  
Wenjun Li ◽  
Xushu Peng ◽  
Bin Wu ◽  
...  
Keyword(s):  
Circular Economy ◽  
Cement Industry

scholarly journals Effects of Red Mud Addition in the Microstructure, Durability and Mechanical Performance of Cement Mortars

2019 ◽  
Vol 9 (5) ◽  
pp. 984 ◽  
Author(s):  
José Ortega ◽  
Marta Cabeza ◽  
Antonio Tenza-Abril ◽  
Teresa Real-Herraiz ◽  
Miguel Climent ◽  
...  
Keyword(s):  
Portland Cement ◽  
Red Mud ◽  
Mechanical Performance ◽  
Network Evolution ◽  
Cement Industry ◽  
Pozzolanic Activity ◽  
Great Effort ◽  
Chloride Ingress ◽  
Cement Mortars ◽  
Cement Based Materials

Recently, there has been a great effort to incorporate industrial waste into cement-based materials to reach a more sustainable cement industry. In this regard, the Bayer process of obtaining alumina from bauxite generates huge amounts of waste called red mud. Few research articles have pointed out the possibility that red mud has pozzolanic activity. In view of that, the objective of this research is to analyse the short-term effects in the pore structure, mechanical performance and durability of mortars which incorporate up to 20% of red mud as a clinker replacement. As a reference, ordinary Portland cement and fly ash Portland cement mortars were also studied. The microstructure was characterised through mercury intrusion porosimetry and non-destructive impedance spectroscopy, which has not previously been used for studying the pore network evolution of red mud cement-based materials. The possible pozzolanic activity of red mud has been checked using differential scanning calorimetry. The non-steady state chloride migration coefficient and the mechanical properties were studied too. According to the results obtained, the addition of red mud entailed a greater microstructure refinement of the mortar, did not worsen the resistance against chloride ingress and reduced the compressive strength compared to control binders.

scholarly journals Properties of Green Mortar Containing Granite Sawmill

2021 ◽  
Vol 11 (5) ◽  
pp. 2136
Author(s):  
Santiago Yagüe ◽  
Víctor Rosales-Prieto ◽  
Alberto Sánchez-Lite ◽  
Cristina González-Gaya
Keyword(s):  
Second Life ◽  
Circular Economy ◽  
Cement Industry ◽  
Mechanical Resistance ◽  
The European Union ◽  
Paper Properties ◽  
Ornamental Stone ◽  
Compression Creep ◽  
Different Types ◽  
Stone Industry

The cement industry is one of the world’s largest CO2 emitters. The need to minimize these emissions, and assimilate by substitution and different types of waste, are challenges faced in the European Union. The use of granite sawmill from the ornamental stone industry allows for the manufacturing of pozzolanic cements, in which 10% and 20% of ordinary Portland cement (OPC) has been replaced by waste. In the present paper, properties of cements and mortars have been tested (when fresh and once set), such as workability, setting, retraction, mechanical resistance to bending and compression, elastic modulus to compression, creep, retraction, and durability. In all cases and substitution proportions, the results have been as satisfactory as those achieved with OPC, even better, allowing a second life to the waste, and participating in the principles of the circular economy. Bot substitutions are very resistant and have great durability for the gelifraction processes from the new green cements. Using this waste—granite sawmill—its volume is minimized and transfer to a landfill is avoided.

scholarly journals Ecofibers for the Reinforcement of Cement Mortars for Coating Promoting the Circular Economy

2020 ◽  
Vol 12 (7) ◽  
pp. 2835 ◽  
Author(s):  
Carolina Piña Ramírez ◽  
Alejandra Vidales Barriguete ◽  
Julián García Muñoz ◽  
Mercedes del Río Merino ◽  
Patricia del Solar Serrano
Keyword(s):  
Circular Economy ◽  
Building Materials ◽  
Cement Mortar ◽  
Construction And Demolition Waste ◽  
Construction Sector ◽  
Demolition Waste ◽  
Vapour Permeability ◽  
Cement Mortars ◽  
Different Types ◽  
Recycled Fibres

Nowadays, nobody can deny that climate change is a reality and that the life cycle of buildings contributes greatly to that reality. Therefore, proposals such as the circular economy must be integrated into the construction sector. This article shows part of the results of a research project whose objective is to introduce circular economy criteria in building materials, seeking new uses for construction and demolition waste from buildings. In particular, this article analyses the possibility of replacing fibres currently used to reinforce cement mortars with recycled fibres. After consulting the bibliography, we can conclude that some studies analyse the behaviour of cement mortars reinforced with different types of fibres, but none has been found that analyses the behaviour of these mortars for the application of continuous coatings. For this purpose, a two-stage experimental plan is designed to test cement mortar samples with different types of fibres, recycled fibres and commercial fibres, taking into consideration the characteristics that these mortars have to comply to be applied as continuous coatings. Moreover, a detailed study about the porosity of these mortars and its influence on how the mortars behave with regard to compression, water vapour permeability and impermeability has been conducted. From the results obtained, it can be concluded that the mortars containing recycled fibres have very similar resistance, absorption and permeability values to those containing commercial fibres, so that they might be suitable for application as external coatings.

scholarly journals PRODUCTION AND CHARACTERISATION OF SRF PREMIUM QUALITY FROM MUNICIPAL AND COMMERCIAL SOLID NON-HAZARDOUS WASTES IN AUSTRIA, CROATIA, SLOVENIA AND SLOVAKIA

Detritus ◽  
2019 ◽  
pp. 125-137 ◽  
Author(s):  
Renato Sarc ◽  
Lisa Kandlbauer ◽  
Karl Erich Lorber ◽  
Roland Pomberger
Keyword(s):  
Circular Economy ◽  
Energy Recovery ◽  
State Of The Art ◽  
Cement Industry ◽  
National Standards ◽  
Hazardous Wastes ◽  
Flow Sheet ◽  
Chemical Analyses ◽  
Physical Chemical

The production of Solid Recovered Fuel (SRF) and related energy recovery in the European cement industry represents the state of the art in waste management, having evolved into a highly important part of a sustainable and circular economy. This paper describes the production and quality of eight Solid Recovered Fuels (SRF) of PREMIUM quality that are produced from Municipal (Mixed) and selected Commercial Wastes (i.e. Bulky and Lightweight Fraction from Plastic Sorting Plants) in three types of treatment plants located in four European countries, namely Austria, Croatia, Slovenia and Slovakia. The investigated SRF PREMIUM Quality was produced in three different Plant Types applying various process technologies. All three types have been investigated and are described in detail (i.e. flow sheet). Eight SRF PREMIUM Qualities have been comprehensively investigated by sorting, sieving, and physical-chemical analyses. Analyses performed are in accordance with (inter)national standards (i.e. Austrian “ÖNORM”, European “EN” standards and CEN TC 343 guidelines). The results gained show that all investigated SRF fulfil the Austrian quality requirements for heavy metals before co-incineration in the cement industry and it can be confirmed that SRF produced in the investigated plants in Austria, Croatia, Slovenia and Slovakia in fact may be declared as “SRF PREMIUM Quality” that can be used for energy recovery on the European SRF market and utilized in the European cement industry.

scholarly journals Synthesis of Geopolymer from Coal Fly Ash and its Comparative Study with Fly Ash Based Ordinary Nepalese Cement

2020 ◽  
Vol 13 (13) ◽  
pp. 24-28 ◽  
Author(s):  
Deepa Humbahadur Gurung ◽  
Vinay Kumar Jha
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Comparative Study ◽  
Cement Mortar ◽  
Coal Fly Ash ◽  
Cement Industry ◽  
Mass Ratio ◽  
Cement Mortars ◽  
The Comparative Study ◽  
Alkali Activated

The world cement industry is responsible for 5-8 % of the total CO2 emission. Thus, the cement industry has a crucial role in global warming. The search for an alternative green inorganic binder with improved durability led to the discovery of alkali-activated binder termed “geopolymer”. In this study, geopolymer was synthesized from coal fly ash (CFA) with the parameters such as particle size ≤ 53 μm, NaOH concentration 8 M and the mass ratio of CFA/Na2SiO3 was 0.75. For the comparative study with fly ash based cement, the cement mortars were prepared by varying the cements and mass ratio. The highest compressive strength (14.16 MPa) of the cement mortar was however obtained with 1:3 cement sand ratio after 7 days of curing, the ratio of 1:4 was considered for comparison. The cement and geopolymer mixture mortars were also prepared with varying (cement + sand) and (CFA+ NaOH+ Na2SiO3) mass ratio. The maximum compressive strength of 3.84 MPa was obtained for 1:2 mass ratio with 7 days of curing. The maximum compressive strengths of CFA based geopolymer, CFA added cement and cement and geopolymer mixture were 17.06, 21.3 and 11.42 MPa with 90 days of curing respectively.

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