Partial replacement of cement with granular marble residue: effects on the properties of cement pastes and reduction of
- PDF / 1,553,932 Bytes
- 12 Pages / 595.276 x 790.866 pts Page_size
- 57 Downloads / 239 Views
Partial replacement of cement with granular marble residue: effects on the properties of cement pastes and reduction of CO2 emission Tatiane Santos1 · Jardel P. Gonçalves2,3 · Heloysa M. C. Andrade1,3 Received: 8 May 2020 / Accepted: 19 August 2020 © Springer Nature Switzerland AG 2020
Abstract The effects of CP V Portland cement replacement with granular marble residues were investigated. The physical–chemical properties of the starting materials and of the pastes were characterized by XRD, XRF, TG/DTA, SEM and granulometric analyses. Axial compressive strength, apparent density, capillary and total capacity of water absorption of the hardened pastes with 0, 10, 20 and 30% replacements, aged for 28 days, were characterized. The results indicated that the partial replacement by the marble residue did not affect the cement hydration but provided packaging improvements and some filler action. The reduction of C O2 emission was estimated as 0.28 million tons per year due to replacement of 10% CP V Portland cement with the marble residue. The results indicated that this is an alternative means to reduce the CO2 emissions in the cement industry and to reuse marble residues that otherwise could be inadequately disposed. Keywords Cement replacement · Marble residue · Filler · Packing effect · CO2 emission · Sustainability
1 Introduction The cement industry, one of the largest sources of atmospheric pollutants in the world, has been heavily charged by environmental control agencies for emitting huge amounts greenhouse gases [1]. Carbon dioxide emissions currently represent the major environmental concern of the cement industry, which accounts for about 5% of the global anthropogenic CO2 emissions [2]. In addition, the cement industry is responsible for consuming large amounts of non-renewable natural resources and electricity, which makes it an important source of environmental impacts. Along with the accelerated development of civil construction, emission levels of pollutants are expected to increase and, therefore, strategic actions are necessary in order to make the cement production more sustainable. In this scenario, the use of mineral wastes in cement
production is envisaged as a promising alternative since it also contributes to reduce the energy consumption and the environmental impacts, by promoting the reuse of mining wastes and providing an environmentally friendly destination for them [3, 4]. The use of mineral wastes as additives in cementitious materials may improve the technical characteristics of the final product by modifying the internal structure of the matrix, increasing the durability and resistance, reducing the porosity of the capillary, reducing the fissures of thermal origin, etc. [5]. Brazil is one of the main producers of ornamental rocks in world, and the processing industry produces around of 1,610,000 t of residues per year [6], corresponding to nearly 30% of the processed raw material [7]. Due to high costs, large amounts of these residues are inadequately disposed, causing importan
Data Loading...
