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Camila Salvi Malacarne

Bio: Camila Salvi Malacarne is an academic researcher from Universidade Federal do Rio Grande do Sul. The author has contributed to research in topics: Clinker (cement) & Environmental impact assessment. The author has an hindex of 1, co-authored 4 publications receiving 1 citations.

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TL;DR: In this article, the authors analyzed the mechanical and environmental performance of an alternative low-carbon cement (Limestone Calcined Clay Cement, LC3) made from different Brazilian natural and waste clay-based materials.
Abstract: This study analyzed the mechanical and environmental performance of an alternative low-carbon cement (Limestone Calcined Clay Cement, LC3) made from different Brazilian natural and waste clay-based materials. Data from an extensive laboratory program to characterize the alternative materials have been utilized. A Life Cycle Assessment (LCA) based on a cradle-to-gate approach was also performed. The results give decision-makers and the cement industry a better understanding of environmental impact at regional, national, and local levels. Moreover, this study opens a new perspective on the natural and waste clay-based materials to further the production of eco-efficient cements in Brazil and other countries.

7 citations

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TL;DR: In this paper, a composicao quimica do residuo and realizaram-se misturas with adicoes of 0, 5, and 10% in relation to a massa de cimento.
Abstract: Essa pesquisa teve por finalidade avaliar um residuo de lodo de efluentes de industrias de papel quanto a potencialidade de emprego em matrizes cimenticias. Verificou-se a composicao quimica do residuo e realizaram-se misturas com adicoes de 0, 5 e 10%, em relacao a massa de cimento. As matrizes cimenticias foram analisadas por meio de calorimetria isotermica, resistencia a compressao, resistencia a tracao na compressao diametral, absorcao de agua por capilaridade, densidade de massa aparente e modulo de elasticidade dinâmico. Os resultados obtidos nao foram satisfatorios, visto que a adicao do residuo a matriz apresentou aumento no consumo de cimento para atingir a resistencia requerida e aumento no consumo de agua para manutencao da consistencia. Palavras-chave: argamassa, matrizes cimenticias, residuo industrial, lodo de papel.

3 citations

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TL;DR: In this paper, the influence of low-grade local materials as clinker substitute in ternary cements, with calcined clay (30 wt%) and limestone (15 wt%), also known as LC³ cements was evaluated.
Abstract: This study aims to evaluate the influence of low-grade local materials as clinker substitute in ternary cements, with calcined clay (30 wt%) and limestone (15 wt%), also known as LC³ cements. A coal mining waste (based on 35 wt% kaolinite content, AR) and a dolomitic limestone (LLS) were compared to more pure materials such as natural clay (constituted by 83% kaolinite content, NC) and high-grade limestone (HLS), respectively. LC³ cements were compared to reference system (45 wt% quartz filler instead of limestone and calcined clays), as well as a fly ash blended cement (40 wt% fly ash, 40FA). Hydration kinetics, water demand, plastic viscosity, and yield stress were evaluated in a fresh state. The fineness of the calcined clays and limestone had a greater impact on the water demand and thixotropy of the pastes than their mineralogical compositions. However, the higher kaolinite content of NC led to higher pozzolanic activity, greater formation of carboaluminate type phases, and compressive strength than LC3 cements with AR. The HLS and LLS had similar impact on the proprieties assessed despite their different mineralogical composition. Thus, both low-grade materials are feasible as raw materials for the production of LC³ type cements with similar performance when compared to conventional cements.

1 citations


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TL;DR: In this paper , the risk assessment related to the presence of waste deposits was carried out based on the methodology proposed by the Spanish Geological Survey and the procedure outlined in the Environmental Risk Assessment Guide of the Ministry of Environment of Peru for nonwaste deposits was applied.
Abstract: Mining environmental liabilities (MEL) are of great concern because of potential risks to ecosystems and human health. In this research, the environmental risk (RI) related to MEL existing in three artisanal and small-scale gold-mining areas of Ecuador was evaluated. For this purpose, data of 167 MEL including landfills, mining galleries, tailing deposits, and mineral processing plants from Macuchi, Tenguel–Ponce Enriquez, and Puyango mining areas, were analyzed. The risk assessment related to the presence of waste deposits was carried out based on the methodology proposed by the Spanish Geological Survey. Moreover, the procedure outlined in the Environmental Risk Assessment Guide of the Ministry of Environment of Peru for nonwaste deposits was applied. The highest RI values were identified in Puyango and Tenguel–Ponce Enriquez. Thus, they were both categorized as priority control areas requiring intervention and rehabilitation plans. The MEL that require a high level of intervention include waste deposits and mine entrances associated with potentially toxic elements. Moreover, the point risk maps showed that rivers in the studied areas have a potential pollution risk. This study provides risk levels associated with MEL in mining areas from Ecuador. This information could be used for environmental management and pollution mitigation.

8 citations

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TL;DR: In this article , the authors investigated the environmental impact of modified granulated copper slag (MGCS) utilization in blended cement production at a representative cement plant in China, and the life cycle impact assessment (LCIA) model was applied.
Abstract: This study aimed to investigate the environmental impact of modified granulated copper slag (MGCS) utilization in blended cement production at a representative cement plant in China. Sensitivity analysis was performed on the substance inputs, and the life cycle impact assessment (LCIA) model was applied. A detailed comparative analysis was conducted of the environmental impact of cement production in other studies, and ordinary Portland cement production at the same cement plant. Results showed that calcination has the largest contribution impact of all the impact categories, especially in causing global warming (93.67%), which was the most prominent impact category. The life cycle assessment (LCA) result of blended cement was sensitive to the chosen LCIA model and the depletion of limestone and energy. In this study, producing blended cement with MGCS effectively mitigated the environmental impact for all the selected impact categories. Results also show a reduction in abiotic depletion (46.50%) and a slight growth (6.52%) in human toxicity. The adoption of MGCS in blended cement would therefore generally decrease the comprehensive environmental impact of cement, which contributes to the development of sustainable building materials.

3 citations

Journal ArticleDOI
Bo Zhang, Ke-qing Li, Siqi Zhang, Yafei Hu, Bin Han 
TL;DR: In this article , the authors investigated the relationship between aggregate grading and different affecting factors and the uniaxial compressive strength (UCS) of the cemented paste backfill (CPB), Talbol gradation theory and neural networks is used to evaluate aggregate gradation to determine the optimum aggregate ratio.
Abstract: Cemented paste backfill (CPB) is a sustainable mining technology that is widely used in mines and helps to improve the mine environment. To investigate the relationship between aggregate grading and different affecting factors and the uniaxial compressive strength (UCS) of the cemented paste backfill (CPB), Talbol gradation theory and neural networks is used to evaluate aggregate gradation to determine the optimum aggregate ratio. The mixed aggregate ratio with the least amount of cement (waste stone content river sand content = 7:3) is obtained by using Talbol grading theory and pile compactness function and combined with experiments. In addition, the response surface method is used to design strength-specific ratio experiments. The UCS prediction model which uses the LSTM and considers the aggregates gradation have high accuracy. The root mean square error (RMSE) of the prediction results is 0.0914, the coefficient of determination (R2 ) is 0.9973 and the variance account for (VAF) is 99.73. Compared with back propagation neural network (BP-ANN), extreme learning machine (ELM) and radial basis function neural network (RBF-ANN), LSTM can effectively characterize the nonlinear relationship between UCS and individual affecting factors and predict UCS with high accuracy. The sensitivity analysis of different affecting factors on UCS shows that all 4 factors have significant effect on UCS and sensitivity is in the following ranking: cement content (0.9264) > slurry concentration (0.9179) > aggregate gradation (waste rock content) (0.9031) > curing time (0.9031).

3 citations

Journal ArticleDOI
TL;DR: In this paper , the current situation of the cement industry in Latin America and the Caribbean and the global opportunities and strategies to reduce the carbon footprint of cement and concrete and their adaptation to the regional conditions are discussed.
Abstract: Carbon neutrality to limit global warming is an increasing challenge for all industries, particularly for the cement industry, due to the chemical emission of the process. For decades, reducing the clinker factor has been one of the main strategies to reduce the carbon footprint. Additional cuttings in the clinker content of cements seem possible with the upsurge of novel supplementary cementitious materials. This potential contribution represents only a fraction of the required carbon reductions for achieving the goal of carbon neutrality in the coming decades. This paper describes the current situation of the cement industry in Latin America and the Caribbean and the global opportunities and strategies to reduce the carbon footprint of cement and concrete and their adaptation to the regional conditions. Besides describing emerging supplementary cementitious materials, the potential contributions of industrialization and quality control are discussed. Moreover, limitations related to geography and standardization are analyzed. Regional considerations are made given the specific prospects of human development.

2 citations