scholarly journals Alumina sludge's Influence on the physicochemical characteristics of CPJ55 cement

2018 ◽  
Vol 149 ◽  
pp. 01058 ◽  
Author(s):  
M. Dahhou ◽  
R. Barbach ◽  
M. El Moussaouiti
Keyword(s):  
Portland Cement ◽  
Xrd Analysis ◽  
Physicochemical Characteristics ◽  
Mechanical Tests ◽  
Partial Replacement ◽  
Free Lime ◽  
Water Plant ◽  
Strength Tests ◽  
Characterization Of Materials

Partial replacement of the Portland cement CPJ55 ingredients by various quantities of alumina sludge (AS), produced during drinking water plant sludge, was used in the preparation of mortar mold with dimensions 40×40×160 mm. The characterization of materials is carried out by X-ray fluorescence (XRF), Xray diffraction (XRD), free lime dosing, and the mechanical tests. Analysis of the chemical composition by XRF shows that the studied alumina sludge is mainly composed of aluminum oxide, silica, which is correlated with the principal mineral phases identified in the XRD analysis results. It is demonstrated that adding 5% of the alumina sludge in Portland cement does not affect the mineralogy of final product. Nevertheless, the compression and flexural strength tests (in 28 days) conducted on mortar sample comprising 5% sludge elucidate that it belongs to cement mortar class of type 32.5 R.

Reuse of Waste Ceramic Powder with a High Content of Amorphous Phases as Partial Replacement of Portland Cement

2014 ◽  
Vol 905 ◽  
pp. 212-215 ◽  
Author(s):  
Zbyšek Pavlík ◽  
Milena Pavlíková ◽  
Jan Fořt ◽  
Tereza Kulovaná ◽  
Robert Černý
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Ceramic Powder ◽  
Xrd Analysis ◽  
Laser Diffraction ◽  
Partial Replacement ◽  
Future Research ◽  
Cement Pastes ◽  
Amorphous Phases ◽  
Hollow Bricks

A possible use of waste ceramic powder as a partial replacement of Portland cement in blended binders is studied. For the ceramic powder, originating from the contemporary hollow bricks production, the measurement of chemical composition is done using XRF and XRD analysis. The particle size distribution of ceramics and cement is accessed on the laser diffraction principle. The blended binders containing ceramic powder in an amount of 8, 16, 24, 32, and 40% of mass of cement are used for the preparation of cement pastes which are then characterized using the measurement of basic physical properties and mechanical properties. Experimental results show that an application of 16% waste ceramics in the blended binder provides sufficient mechanical properties of the paste. This makes good prerequisites for future research that will be focused on the development of new types of cement-based composites with incorporated ceramic waste powder.

scholarly journals UTILIZAÇÃO DA CINZA DA CASCA DO COCO VERDE COMO SUBSTITUIÇÃO PARCIAL DO CIMENTO PORTLAND EM ARGAMASSAS

2017 ◽  
Vol 13 (1) ◽  
Author(s):  
Cleidson Carneiro Guimarães ◽  
Samile Raiza Carvalho Matos
Keyword(s):  
Portland Cement ◽  
Environmental Impacts ◽  
Industrial Waste ◽  
Coconut Shell ◽  
Partial Replacement ◽  
Index Analysis ◽  
Hardened State ◽  
Materials Used ◽  
Strength And Durability

RESUMO: O presente trabalho tem como objetivo principal avaliar a influência da cinza da casca de coco verde (CCCV) nas propriedades das argamassas no estado fresco e endurecido, a partir da substituição parcial do cimento Portland (CP) por cinza. Esta proposta surge da problemática ligada à destinação da casca do coco como resíduo urbano e agroindustrial e dos impactos ambientais provocados pela produção do cimento Portland. Para realização dessa pesquisa foram produzidas uma argamassa de referência e outras três argamassas com diferentes teores de substituição do CP por CCCV. Inicialmente, foi feita a caracterização dos materiais utilizados no trabalho e a análise de índice de pozolanicidade da cinza. Em seguida, foram feitas análises referenciais das propriedades das argamassas produzidas no estado fresco e no estado endurecido. A partir das análises pode-se perceber que a presença da cinza na argamassa influencia na trabalhabilidade, resistência mecânica e na durabilidade da argamassa e que a CCCV não possui potencial pozolânico. A adição de até 10% de CCCV substituindo o cimento Portland é viável.
 
 ABSTRACT: This study aims to evaluate the influence of ash green coconut shell (AGCS) on the properties of mortars in fresh and hardened, from the partial replacement of Portland cement (PC) by gray. This proposal arises from problems linked to the allocation of coconut shell as urban and agro-industrial waste and environmental impacts caused by the production of Portland cement. For this survey were produced a reference mortar and three mortars with different CP replacement levels by AGCS. Initially, it was the characterization of the materials used at work and ash pozzolanicity index analysis. Next, analyzes were made reference the properties of mortars produced in fresh and hardened state. From the analysis it can be seen that the ash presence in the mortar influences the workability, strength and durability of the mortar and the CCCV not have pozzolanic potential. The addition of up to 10% AGCS replacing the Portland cement is feasible.

scholarly journals Mechanical Performance of Concrete with Partial Replacement of Sand by Sewage Sludge Ash from Incineration

2012 ◽  
Vol 730-732 ◽  
pp. 462-467 ◽  
Author(s):  
A. Jamshidi ◽  
M. Jamshidi ◽  
N. Mehrdadi ◽  
A. Shasavandi ◽  
F. Pacheco-Torgal
Keyword(s):  
Sewage Sludge ◽  
Environmental Problem ◽  
Mechanical Performance ◽  
Waste Water Treatment ◽  
Xrd Analysis ◽  
Mechanical Tests ◽  
Partial Replacement ◽  
Sewage Sludge Ash ◽  
Sludge Ash ◽  
Ash Disposal

The production of sewage sludge from waste water treatment plants is increasing all over the world. Disposal of sewage sludge ash is a serious environmental problem. If we think of the areas needed for sludge ash disposal, we clearly understand the importance of reusing sewage sludge ash in concrete. This paper presents results related to the replacement of sand by sewage sludge ash. The sludge was characterized for chemical composition (XRF analysis), crystalline phases (XRD analysis) and pozzolanic activity. The effects of incineration on crystal phases of dry sludge were investigated. Two (W/C) ratios (0.55 and 0.45) and three sludge percentages (5%, 10% and 20%) by cement mass were used. The mechanical performance of SSAC at different curing ages (3, 7, 28 and 90 days) was assessed by means of mechanical tests. Results show that sewage sludge ash leads to a reduction in density and mechanical strength. Results also show that concrete with 20% of sewage sludge ash and W/C=0.45 has a 28 day compressive strength of almost 30MPa.

scholarly journals Compressive Strength of High-Volume Fly Ash (HVFA) Concrete as a Function of Lime Water and Curing Time

2021 ◽  
Author(s):  
Chin Mei Yun ◽  
Md. Rezaur Rahman ◽  
Kuok King Kuok ◽  
Mohd Elfy Mersal ◽  
Colin Ngu Ker Liing ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Portland Cement ◽  
High Volume ◽  
Partial Replacement ◽  
Curing Time ◽  
Additional Information ◽  
Lime Water ◽  
High Volume Fly Ash

Abstract The compressive strength of high-volume fly ash (HVFA) concrete with varied volume percentages of 40%, 50%, and 60% was examined utilizing low calcium fly ash (Class-F) as a partial replacement for regular Portland cement in this study. On the 7th, 28th, and 56th days, the compressive strength is tested. At the 7th and 28th days, the influence of saturated lime water on the compressive strength of HVFA concrete is evaluated. The inclusion of fly ash as a replacement for Portland cement reduces the compressive strength of the HVFA concrete, according to the findings. At the 56th day, the HVFA concrete with 40% fly ash substitution has a compressive strength equivalent to the regular weight concrete. At the 28th day, it was discovered that saturated lime water was helpful in maximizing the strength of HVFA concrete with 50% fly ash substitution. There was additional information about the characterization of HVFA concrete.

Characterization of fly ash reactivity in hydrating cement by neutron scattering

2009 ◽  
Vol 24 (7) ◽  
pp. 2435-2448 ◽  
Author(s):  
Walairat Bumrongjaroen ◽  
Richard A. Livingston ◽  
Dan A. Neumann ◽  
Andrew J. Allen
Keyword(s):  
Fly Ash ◽  
Portland Cement ◽  
Neutron Scattering ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Pozzolanic Reaction ◽  
Effective Density ◽  
Partial Replacement ◽  
Cement Pastes

Partial replacement of hydrating Portland cement by fly ash produces competing effects: it contributes calcium hydrate silicate (C-S-H) gel through the pozzolanic and alkali-activated reactions but dilutes the contribution of the main Portland cement reaction. To investigate this, two neutron-scattering methods were applied to density-fractionated lignite-type and bituminous-type fly ash/Portland cement pastes (20% by mass replacement). Small-angle neutron scattering (SANS) measured the effect of the fly ash on the fractal C-S-H microstructure, whereas inelastic neutron scattering (INS) measured the pozzolanic reaction in terms of calcium hydroxide (CH) consumption. The CH consumption increased with the effective density fraction, and the fractal microstructure evolved more slowly for all fly ash mixes compared with the pure cement control. However, gel volume measured by SANS showed no correlation with the CH consumption measured by INS. The implications of these results are discussed.

Study of the Technical Capability of Sugarcane Bagasse Ash in Concrete Production

2016 ◽  
Vol 866 ◽  
pp. 53-57 ◽  
Author(s):  
Thiago da Cruz Sessa ◽  
Marcos Martinez Silvoso ◽  
Elaine Garrido Vazquez ◽  
Eduardo Linhares Qualharini ◽  
Assed Naked Haddad ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Mechanical Tests ◽  
Cement Industry ◽  
Partial Replacement ◽  
Experimental Program ◽  
Concrete Production ◽  
Sugarcane Bagasse Ash ◽  
Definition Of ◽  
Mineral Mixtures

Cement industry has a great contribution to CO2 emissions in the world. In order to reduce the levels of CO2 emissions and the consequences of global warming, some researches have been developed aiming to reduce the cement volume produced through mineral mixtures. Sugarcane bagasse ash (SCBA) represents an important environmental liability of the alcohol industry in the northern state of Rio de Janeiro and its use as a partial replacement of Portland cement in concrete has shown great potential for use. This paper aims to analyze, through experimental procedures, the consistency and mechanic strength on concrete with low environmental impact, made from sugarcane bagasse ash, in substitution levels of 20% and 40%. The methodology of the experimental program, included the steps of characterizing the materials; definition of the reference concrete; molding and dosing of the reference concrete and concrete with SCBA; mechanical tests to evaluate the resistance in the reference test bodies; and analysis of the results. The method used from production and processing of the ash to the characterization of other materials in the concrete are also addressed in this study. The results indicate the feasibility of using sugarcane bagasse ashes in application of concretes in the construction industry.

Some applications of electron beam microanalysis techniques in VLSI process evaluation

1983 ◽  
Vol 41 ◽  
pp. 160-161
Author(s):  
Simon Thomas
Keyword(s):  
Integrated Circuits ◽  
Process Evaluation ◽  
Large Scale ◽  
Technology Development ◽  
Analytical Techniques ◽  
Successful Implementation ◽  
Analysis Of Failures ◽  
Characterization Of Materials ◽  
Circuits Vlsi

Trends in the technology development of very large scale integrated circuits (VLSI) have been in the direction of higher density of components with smaller dimensions. The scaling down of device dimensions has been not only laterally but also in depth. Such efforts in miniaturization bring with them new developments in materials and processing. Successful implementation of these efforts is, to a large extent, dependent on the proper understanding of the material properties, process technologies and reliability issues, through adequate analytical studies. The analytical instrumentation technology has, fortunately, kept pace with the basic requirements of devices with lateral dimensions in the micron/ submicron range and depths of the order of nonometers. Often, newer analytical techniques have emerged or the more conventional techniques have been adapted to meet the more stringent requirements. As such, a variety of analytical techniques are available today to aid an analyst in the efforts of VLSI process evaluation. Generally such analytical efforts are divided into the characterization of materials, evaluation of processing steps and the analysis of failures.

Applications of ultramicrotomy for materials characterization

1993 ◽  
Vol 51 ◽  
pp. 232-233
Author(s):  
R.T. Blackham ◽  
J.J. Haugh ◽  
C.W. Hughes ◽  
M.G. Burke
Keyword(s):  
Materials Science ◽  
Microstructural Analysis ◽  
Analytical Electron Microscopy ◽  
Austenitic Stainless Steels ◽  
Specimen Preparation ◽  
Preparation Technique ◽  
Thermally Induced ◽  
Radiation Induced ◽  
Characterization Of Materials

Essential to the characterization of materials using analytical electron microscopy (AEM) techniques is the specimen itself. Without suitable samples, detailed microstructural analysis is not possible. Ultramicrotomy, or diamond knife sectioning, is a well-known mechanical specimen preparation technique which has been gaining attention in the materials science area. Malis and co-workers and Glanvill have demonstrated the usefulness and applicability of this technique to the study of a wide variety of materials including Al alloys, composites, and semiconductors. Ultramicrotomed specimens have uniform thickness with relatively large electron-transparent areas which are suitable for AEM anaysis.Interface Analysis in Type 316 Austenitic Stainless Steel: STEM-EDS microanalysis of grain boundaries in austenitic stainless steels provides important information concerning the development of Cr-depleted zones which accompany M23C6 precipitation, and documentation of radiation induced segregation (RIS). Conventional methods of TEM sample preparation are suitable for the evaluation of thermally induced segregation, but neutron irradiated samples present a variety of problems in both the preparation and in the AEM analysis, in addition to the handling hazard.

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