Rock Wool Waste as Supplementary Cementitious Material for Portland Cement-Based Composites

2018 ◽  
Author(s):  
K. D. C. Silva ◽  
G. C. Silva ◽  
J. F. Natalli ◽  
J. C. Mendes ◽  
G. J. B. Silva ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cementitious Material ◽  
Supplementary Cementitious Material ◽  
Rock Wool

scholarly journals Use of metakaolin as supplementary cementitious material in concrete, with focus on durability properties

2019 ◽  
Vol 4 ◽  
pp. 89-102 ◽  
Author(s):  
Alice T Bakera ◽  
Mark G Alexander
Keyword(s):  
Portland Cement ◽  
Cementitious Material ◽  
Concrete Durability ◽  
Western Cape ◽  
Supplementary Cementitious Material ◽  
Durability Properties ◽  
Carbonation Resistance ◽  
Performance Results ◽  
Local Materials ◽  
Durability Performance

Numerous research efforts on metakaolin as a supplementary cementitious material (SCM) have been undertaken in the past 20 years. This material, while relatively expensive mainly due to low production volumes worldwide, nevertheless has a significantly lower production cost than Portland cement. However, industry remains tentative in considering metakaolin in concrete. This paper takes the view that industry should consider investing in the production and application of metakaolin in appropriate concrete projects, particularly in aggressive environments where plain Portland cement may be inadequate, and where other SCMs may not readily be available. The main contribution of the paper is a global review of recent studies on the use of metakaolin in different types of concrete. This international experience is then compared with results from a study on the durability performance of metakaolin concrete using local materials in the Western Cape province of South Africa, as a means of concrete performance improvement. The study investigates concrete durability properties: penetrability (sorptivity, permeability, conductivity and diffusion), mitigation of Alkali-Silica Reaction (ASR), and carbonation resistance. The concretes were prepared with three water-binder ratios (0.4, 0.5 and 0.6), and with metakaolin replacement levels of 0% (control), 10%, 15% and 20%. Performance results show that, with increasing metakaolin content, the transport properties of concrete are considerably improved, ASR expansion due to a highly reactive local aggregate decreases to non-deleterious levels, while no detrimental effect on carbonation is observed. Thus, metakaolin could serve as a valuable SCM to enhance the durability performance of concrete in local aggressive environments.

scholarly journals Activated Clays and Their Potential in the Cement Industry

2021 ◽  
Author(s):  
Carlos Hernando Aramburo Varela ◽  
Luiz Felipe de Pinho ◽  
César Pedrajas Nieto-Márquez ◽  
Rafael Talero Morales
Keyword(s):  
Portland Cement ◽  
Thermal Activation ◽  
Large Scale ◽  
Scientific Basis ◽  
Cementitious Material ◽  
Cement Industry ◽  
Supplementary Cementitious Material ◽  
Cement Manufacture ◽  
Reactive Alumina ◽  
Reactive Silica

The thermal activation of clays to produce highly reactive artificial pozzolans on a large scale is one of the most important technologies developed on an industrial scale to reduce CO2 emissions in cement manufacture. This technical document deals with the scientific basis for the thermal activation of clays to produce an extraordinarily high quality supplementary cementitious material (SCM) based on the contents of its hydraulic factors, reactive silica (SiO2r–) and reactive alumina (Al2O3r–). The production process and the optimization of its use in the new cements offers better performance, features and durability. Furthermore, its mixture with Portland cement is much more appropriate when carried out in a blending station after both components, activated clay and Portland cement, are ground separately and not jointly in a single mill.

Rock wool wastes as a supplementary cementitious material replacement in cement-based composites

2013 ◽  
Vol 11 (2) ◽  
pp. 93-104 ◽  
Author(s):  
Wei-Ting Lin ◽  
An Cheng ◽  
Ran Huang ◽  
Yuan-Chieh Wu ◽  
Ta-Yuan Han
Keyword(s):  
Cementitious Material ◽  
Supplementary Cementitious Material ◽  
Rock Wool

Residual Strength of Thermally Loaded Mortars with Treated Municipal Solid Waste Incineration Fly Ash Used as Supplementary Cementitious Material

2014 ◽  
Vol 982 ◽  
pp. 114-118 ◽  
Author(s):  
Martin Keppert ◽  
Kirill Polozhiy
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Building Materials ◽  
Cementitious Material ◽  
Air Pollution Control ◽  
Fly Ashes ◽  
Mswi Fly Ash ◽  
Supplementary Cementitious Material

Fly ashes collected in Air Pollution Control lines of Municipal Solid Waste Incinerators (MSWI) differ highly from fly ashes generated during coal burning what complicates their utilization in building materials production. Nevertheless after a treatment such ashes can have properties relatively comparable with coal fly ashes and thus can be used as Supplementary Cementitious Material (SCM). The water extracted MSWI fly ash was used as partial Portland cement replacement in mortars. The mortars strength evolution in time was monitored; behavior typical for pozzolans – slower increase of strength – was observed. Influence of thermal load on strength of mortars was studied as well. It can be concluded that water extracted MSWI fly ash can be used as 10 % Portland cement substitute without loss of mechanical properties.

Potentiality of Industrial Waste as Supplementary Cementitious Material in Concrete Production

2020 ◽  
Vol 11 (5) ◽  
pp. 214
Author(s):  
Sajjad Ali Mangi ◽  
Zubair Ahmed Memon ◽  
Shabir Hussain Khahro ◽  
Rizwan Ali Memon ◽  
Arshad Hussain Memon
Keyword(s):  
Industrial Waste ◽  
Cementitious Material ◽  
Supplementary Cementitious Material ◽  
Concrete Production
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