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 Effect of incorporation of grits waste on the densification behavior of soil-cement bricks

Cerâmica ◽  
2015 ◽  
Vol 61 (360) ◽  
pp. 414-419 ◽  
Author(s):  
F. B. Siqueira ◽  
J. N. F. Holanda
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Partial Replacement ◽  
Densification Behavior ◽  
X Ray Diffraction ◽  
X Ray ◽  
Kraft Process ◽  
Soil Cement ◽  
Materials Used ◽  
Strength And Durability

Abstract In the cellulose industry the Kraft process is widely used to produce cellulose. This process generates huge volumes of inorganic solid wastes, including the grits waste. In Brazil, the final disposal of this solid waste is of high economical and environmental interest. The present work assesses the influence of the addition of grits waste on the densification behavior of soil-cement bricks. The raw materials used were soil, Portland cement, and grits waste. Soil-cement bricks containing up to 30 wt.% grits waste in partial replacement of Portland cement were prepared by uniaxial pressing and cured for 28 days. The following technological properties were determined: water absorption, compressive strength, and durability. The microstructure was evaluated by scanning electron microscopy and X-ray diffraction. The experimental results indicated that the addition of grits waste influenced positively the densification behavior of the soil-cement bricks. Moreover, the grits waste could be incorporated into the soil-cement brick composition up to 20 wt.% as a partial replacement of Portland cement.

scholarly journals PROPRIEDADES DE ARGAMASSAS COM EVA (ETHYLENE VINYL ACETATE) EM SUBSTITUIÇÃO PARCIAL AO AGREGADO

2017 ◽  
Vol 13 (1) ◽  
Author(s):  
Cleidson Carneiro Guimarães ◽  
Érica Souza Andrade
Keyword(s):  
Vinyl Acetate ◽  
Industrial Waste ◽  
Raw Materials ◽  
Ethylene Vinyl Acetate ◽  
Project Managers ◽  
Partial Replacement ◽  
Construction Sector ◽  
Cement Ratio ◽  
Aggregate Content ◽  
Hardened State

RESUMO: O setor da construção civil apresenta grande potencial para aproveitamento de vários tipos de resíduos industriais. A incorporação dos resíduos, principalmente nas argamassas e concretos, produtos com vasta aplicabilidade no setor, tem se mostrado como uma ótima alternativa na diversificação das matérias-primas e para a economia de recursos naturais. Esse trabalho avaliou as propriedades das argamassas, no estado fresco e endurecido, produzidas com substituição parcial da areia por resíduo de EVA (Ethylene Vinyl Acetate). Para isso, foram preparadas argamassas com teores de substituição do agregado 0% (referência), 5%, 10% e 15%, em massa. A relação água/cimento, para cada traço, foi determinada empiricamente e mantida constante para as argamassas com substituição. Os resultados apontam que as argamassas produzidas com agregado de EVA apresentam menor absorção de água e também um decréscimo da resistência mecânica. Desta forma, a produção de argamassas utilizando EVA em substituição ao agregado natural é viável, todavia é necessário avaliar os parâmetros mínimos de aplicação para cada finalidade. Dessa forma, o trabalho apresenta contribuição ao servir de suporte a gestores de empresas de argamassas ou gestores de obra a tomarem decisões acerca da inserção do resíduo de EVA na produção de argamassa. ABSTRACT: The construction sector has great potential for use of various types of industrial waste. The incorporation of waste, especially in mortar and concrete products with wide applicability in the industry, has proven to be a great alternative for diversification of raw materials and the economy of natural resources. This study evaluated the properties of mortars in fresh and hardened state, made with partial replacement of sand by waste EVA (Ethylene Vinyl Acetate). For this, mortars were prepared with substitution aggregate content 0%(reference), 5%, 10% and 15% by weight. The water / cement ratio for each trace has been empirically determined and maintained constant for the mortars with replacement. The results show that the mortars produced with EVA aggregate have lower water absorption and also a decrease in the mechanical strength. Thus, the production of mortar using EVA instead of natural aggregate is feasible, however, it is necessary to evaluate the minimum parameters for each application purpose. Thus, the work presents contribution to provide support for the mortar company managers or project managers make decisions about the insertion of EVA residue in the production of mortar.

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.

scholarly journals Characterization of lightweight cement concrete with partial replacement of coconut shell fine aggregate

2019 ◽  
Vol 1 (6) ◽  
Author(s):  
Sunday U. Azunna ◽  
Farah N. A. A. Aziz ◽  
Pang M. Cun ◽  
Mohamed M. O. Elhibir
Keyword(s):  
Coconut Shell ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Cement Concrete

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.

Performance of Mortar Grouts Incorporating Rice Husk Ash and Fly Ash

2019 ◽  
pp. 31-48
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Apparent Volume ◽  
Partial Replacement ◽  
Hardened State ◽  
Strength And Durability ◽  
Penetration Tests

Chapter 3 is based on performance of mortar grouts incorporating rice husk ash (RHA) and fly ash (FA). Detailed experimental work was conducted to investigate the mechanical properties of mortar grout using RHA and FA as partial replacement of cement. This study investigated the compressive strength and durability of mortar grouts in their hardened state. Durability tests such as water absorption, apparent volume of permeable voids, sorptivity, and rapid chloride penetration tests are researched. Detailed results and discussion which focused on mechanical properties as well as durability of hardened state mortar grout are presented. It was confirmed that the inclusion of blended RHA and FA significantly improved the compressive strength of mortar grouts. The durability of mortar grout increased along with a longer curing time. Hence, RHA and FA can partially replace cement in the production of mortar grouts.

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.

scholarly journals Properties of Portland Cement Mortar with Substitutions of Natural and Expanded Perlite

2018 ◽  
Author(s):  
Mauricio Arreola Sánchez ◽  
Wilfrido Martínez Molina ◽  
Hugo Luis Chávez García ◽  
Elia Mercedes Alonso Guzmán ◽  
Andrés A. Torres Acosta ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cement Mortar ◽  
Total Porosity ◽  
Ultrasonic Pulse Velocity ◽  
Ultrasonic Pulse ◽  
Pulse Velocity ◽  
Partial Replacement ◽  
Expanded Perlite ◽  
Hardened State ◽  
Non Destructive

The present research deals with the feasibility of using high-temperature pozzolans such as Natural Perlite (NP) and Expanded Perlite (EP), different dosagues of additions were made to mortars in order to perform their mechanical properties. Mortars were subjected to destructive tests in hardened state: compression, tension, flexion and adhesion strength; as well as non-destructive tests in hardened state: ultrasonic pulse velocity (UPV), electrical resistivity (ER), density (ρ) and total porosity (PT); in addition to attack by sodium sulfate at 90 days. The percentages of the substitutions were 5%, 10%, 15%, 20% and 30% by weight of Portland cement mass (PC) relative to a control mortar (cement-sand-water). With the partial replacement of the cement and according to the tests carried out, it can be observed that the problem of durability and CO2 emissions is significantly reduced and, consequently, an energy saving and a lower environmental impact are promoted.

scholarly journals EFFECT/BEHAVIOUR OF BLACK CURRANT LEAF ASH ON THE STRENGHT OF CONCRETE WITH RESPECT TO A CONTROL MIXES STRENGHT.

2019 ◽  
Author(s):  
Mala Babagana Gutti ◽  
Ani Abdulfatah Musa
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Blended Cement ◽  
Partial Replacement ◽  
Cement Concrete ◽  
Black Currant ◽  
Durability Test ◽  
Concrete Production ◽  
The Cost ◽  
Strength And Durability

The use of waste materials with pozzolanic products in concrete production is becoming a worldwide practice. The assessment of the pozzolanic activity of cement replacement materials is becoming increasingly important because of the need for more sustainable cementing products. In this report, black currant leaf ash is used as partial replacement of 5% of the concrete material. The Strength and durability test were carried out in order to assess the feasibility of using black currant leaf ash as partial replacement of cement in concrete. A total of 18 concrete cubes of 150mm x 150mm x 150mm in size were produced with ordinary Portland cement, 9 concrete cubes as control mix and 9 concrete cubes of black currant blended cement concrete, the samples were tested, weighed, and crushed to obtain their compressive strength after curing in water at age 7, 14 and 21 days. The after the study was completed it was found that the strength of the concrete increase as the samples with replacement were almost the same in strength as the control, Therefore, ordinary Portland cement-black currant blended cement concrete could be used in civil engineering and building works, especially where early strength is not a major requirement, thereby reducing the cost of production.

scholarly journals Physical-mechanical potential properties of wastes from glass lapping to produce mortar as partial replacement of the conventional aggregate

2020 ◽  
Vol 13 (1) ◽  
pp. 142-159
Author(s):  
U. G. RIBEIRO ◽  
D. F. SANTOS
Keyword(s):  
Portland Cement ◽  
Moisture Absorption ◽  
Mechanical Performance ◽  
Grain Size Analysis ◽  
Partial Replacement ◽  
Size Analysis ◽  
Fine Aggregate ◽  
Fine Tailings ◽  
Hardened State ◽  
Glass Lapping

Abstract Glass lapping residues (RLV) are fine tailings from the processing of glass for civil construction, commonly non-recyclable. The present study analyzed the use of these residues in Portland cement mortar composition, partially replacing the conventional aggregate, aiming at better compaction. Percentages of residues were adopted at 0% (reference), 5%, 10% and 20% by mass, replacing the fine conventional aggregate (sand). The binder used was Portland cement CP IV-32. The RLV and fine aggregate were submitted to physical tests, through grain size analysis, grain shape and specific mass; RLV and cement, in turn, submitted to chemical analysis by X-ray spectrometry, to identify the compounds. To evaluate the compressive strength and compaction analysis of the composite in the hardened state, cylindrical specimens 50x100 mm were produced. ANOVA (Analisys of Variance) and Coefficient of Variation showed that the RLV added in 5% resulted in lower voids indexes and moisture absorption than the conventional one. The tests also showed best mechanical performance on compression analisys (30,2 MPa) for 5% of residues in the composite, surpassing the conventional one.

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