Use of Quartzite Quarries Wastes in Civil Construction

2013 ◽  
Vol 548 ◽  
pp. 135-140 ◽  
Author(s):  
Mario L. Cabello ◽  
Antonio E.C. Peres ◽  
Afonso H. Martins ◽  
Carlos A. Pereira
Keyword(s):  
Compressive Strength ◽  
Water Content ◽  
Laboratory Tests ◽  
Minas Gerais ◽  
The State ◽  
Single Stage ◽  
Raw Material ◽  
Economic Viability ◽  
Dimension Stone ◽  
Alkali Aggregate Reaction

The extraction of the dimension stone quartzite in the state of Minas Gerais, Brazil, has been done mostly in small quarries, at very low recovery levels, generating approximately six million tons of waste by year. The aim of this investigation is to study the application of the quartzite waste as aggregate in the civil construction. Laboratory tests of crushing and grinding were done to assess the technical and economic viability of reducing the size of coarse material rendering it adequate to be used as raw material in industrialized mortars and concrete pre-molded components. Samples of concrete using quartzite waste as aggregate were molded in proportions and water content used in the production of pre-molded components and the final compressive strength was assessed. Then, samples of mortars with quartzite waste as aggregate were molded with variations in proportion, water content and top size of aggregates, to assess the workability and final compressive strength. It was concluded that with a single stage of crushing, the waste generated could be used in the production of pre-molded components. An additional stage of grinding would be required for use of a larger amount of quartzite waste in the production of mortars. The alkali-aggregate reaction was not considered in this study.

scholarly journals Investigations on Flexural and Compressive Strengths of Mortar Dedicated to Clinker Units—Influence of Mixing Water Content and Curing Time

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 347
Author(s):  
Jan Kubica ◽  
Iwona Galman
Keyword(s):  
Compressive Strength ◽  
Water Content ◽  
Laboratory Tests ◽  
Bending Strength ◽  
Mechanical Parameters ◽  
Curing Time ◽  
The Impact ◽  
Mixing Water

The article presents laboratory tests on the impact of the mixing water content used in the preparation of fresh mortar on the flexural and compressive strength of one of the dry-mix mortars produced by a leading European producer and dedicated to bricklaying with clinker elements. The development of these parameters in relation to curing time was also analyzed. The mortar samples were prepared from a factory-made mortar mix using 4.0 L (the value recommended by the mortar manufacturer), 4.5 L, and 5 L of water per 25 kg bag of ready-made, pre-mixed dry mortar mix. All samples were tested in five series after 5, 9, 14, 21, and 28 days of sample curing. The results of these tests showed that the use of 6 and 18% more mixing water than recommended by the manufacturer (4.5 and 5 L per bag) adversely affected the basic mechanical parameters of the tested mortar. Moreover, it was found that the highest compressive strength values were obtained after 21 days of curing and not after 28 days as usual. It was also found that hardening time and higher than recommended water content adversely affected the bending strength of the mortar.

scholarly journals PROFILE OF SAWMILLS IN THE UBÁ FURNITURE HUB IN THE STATE OF MINAS GERAIS

2020 ◽  
Vol 28 ◽  
pp. 245-254
Author(s):  
Vinícius Resende de Castro ◽  
Luciano Junqueira Costa ◽  
Wilton Ribeiro de Almeida Filho
Keyword(s):  
Minas Gerais ◽  
The State ◽  
Raw Material ◽  
Open Questions ◽  
Eucalyptus Wood ◽  
Internal Management ◽  
Structured Questionnaire ◽  
Responsible Person

The objective of this work was to identify, diagnose and characterize the sawmills in four municipalities in the State of Minas Gerais (Divinésia, Senador Firmino, Brás Pires and Dores do Turvo) that provide lumber for the industries in the Furniture Hub in Ubá, State of Minas Gerais. A semi-structured questionnaire with open questions, answered in loco and accompanied by a responsible person (interviewer), with information on the identification of the potentialities and fragilities of the local lumber sector as well as to know the raw material (logs), the wood split processes, the internal management, the qualification of the employees, the machinery, products, market and prospects of the sector in these municipalities. It was found that Eucalyptus wood is the most used. The diameter of the logs is shown as the factor that affects the yield in 100% of the analyzed sawmills, where cracking and variability of the logs are the main difficulties of working with the raw material. The lumber sector in the analyzed municipalities needs a greater qualification, both managerial and technical, to improve the activity. In addition, it is necessary to better organize the companies related to the lumber sector through associations and support from local entities and greater exposure of the products to the local consumers.

scholarly journals Eucalyptus Chip Ashes in Cementitious Composites

2014 ◽  
Vol 775-776 ◽  
pp. 205-209 ◽  
Author(s):  
Domingos Sávio de Resende ◽  
Herbet Radispiel Filho ◽  
José Genário Keles ◽  
Augusto Cesar da Silva Bezerra ◽  
Maria Teresa Paulino Aguilar ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Portland Cement ◽  
Mechanical Behavior ◽  
Minas Gerais ◽  
The State ◽  
Pozzolanic Activity ◽  
Partial Replacement ◽  
Cementitious Composites ◽  
Mineral Additives

The Alto Paranaiba and Triângulo Mineiro mesoregion in the state of Minas Gerais and the State of São Paulo have a number of industries with eucalyptus chip fired boilers that produce great amounts of ash. Since thermoelectric ashes generally have good pozzolanic activity, this paper studied the mechanical behavior of cementitious composites made with raw eucalyptus chip ash as a partial replacement for Portland cement and processed under two different conditions. The mechanical behavior of the composites was measured from tests on specimens for their compressive strength, tensile strength to diametral stress and to bending. Results show ashes could be used as mineral additives.

scholarly journals BIOBRIQUETTE PRODUCTION FROM PALM FRONDS AND SHELLS: EFFECT OF MATERIAL COMPOSITION AND PARTICLE SIZE

2018 ◽  
Vol 7 (1) ◽  
pp. 28-33
Author(s):  
Okta Bani ◽  
Iriany ◽  
Taslim ◽  
Cici Novita Sari ◽  
Cindy Carnella
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Carbon Content ◽  
Water Content ◽  
Combustion Rate ◽  
Calorific Value ◽  
Ash Content ◽  
Raw Material ◽  
Fixed Carbon ◽  
Fixed Carbon Content

Briquettes are solid fuels from organic materials with high calorific values ​​and burn duration. The composition and particle size of the raw material may affect briquette quality. This study aimed to evaluate the effect of composition and particle size on calorific value and characteristics of the resulting briquettes. In this study, briquettes were made using palm oil fronds and shells at mass ratio of 1:2, 1:4, 1:6, 1:8 and particle size of not-dertemined, 50, 70, and 100 mesh. First, raw material was carbonized at 450°C for 30 minutes then added to 20%wt. starch glue and waste oil (1:1 ratio). Resulting briquettes were analyzed for its water content, ash content, density, volatile matter content, fixed carbon content, combustion rate, calorific value, and compressive strength. Satisfying results were obtained for briquettes with a front to shell ratio of 1:8, and a particle size of 100 mesh. At this condition, the resulting briquettes have water content of 5.5%; ash content of 2.54%; density of 0.51 g/cm3; 19.58% vapor content; fixed carbon content of 72.38%; combustion rate of 0.2 g/min (3.4×10-3 g/sec); calorific value of 15.3 kcal/g; and compressive strength of 0.06 N/mm2. These results have complied with the Indonesian National Standard (SNI), Japanese, American, and English standards, except for briquette compressive strength, which have not met the industrial standard.

SIFAT FISIS MEKANIS BAMBU LAPIS SEBAGAI BAHAN BAKU PRODUK INTERIOR

2011 ◽  
Vol 3 (1) ◽  
pp. 15
Author(s):  
Arhamsyah Arhamsyah
Keyword(s):  
Flexural Strength ◽  
Water Content ◽  
Raw Material ◽  
Technical Aspects ◽  
Material Layer ◽  
Weight Variation

Research on the utilization of bamboo as a raw material layer interior products have been made. This research aims to determine the nature of plybamboo in terms of technical aspects / processes of manufacture, physical and mechanical, the influence of weight variation labur adhesive, adhesive types and kinds of bamboo products plybamboo.This type of bamboo used is sweet bamboo (Gigantochloa atter Kurz) and bamboo lear (Gigantochloa apus Kurz).The adhesive used was adhesive Polyvinil Acetat (PVAc) and Chloroprene with adhesive labur weight each - each 150 gr/m2, 200 gr/m2 and 250 gr/m2. The parameters tested were water content, density, flexural strength of dry and delamination.The results showed that the treatment using bamboo material with adhesive Chloroprene sweet heavy labur 250 gr/m2 produce the best plybamboo.Keywords: bamboo, glue, physical, mechanical

Effect of incarceration on criminality in the state of Minas Gerais, Brazil

2021 ◽  
Author(s):  
Laís de Sousa Abreu Soares ◽  
Filipe Mendes Dalboni ◽  
Evandro Camargos Teixeira
Keyword(s):  
Minas Gerais ◽  
The State

scholarly journals Low frequency of LRV1 in Leishmania braziliensis strains isolated from typical and atypical lesions in the State of Minas Gerais, Brazil

2016 ◽  
Vol 210 (1-2) ◽  
pp. 50-54 ◽  
Author(s):  
Diego H. Macedo ◽  
Armando Menezes-Neto ◽  
Jeronimo M. Rugani ◽  
Ana C. Rocha ◽  
Soraia O. Silva ◽  
...  
Keyword(s):  
Low Frequency ◽  
Minas Gerais ◽  
The State ◽  
Leishmania Braziliensis

scholarly journals A Novel Approach to Fabricate Foam Ceramics from Steel Slag

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Yu Zheng ◽  
Xudong Luo ◽  
Jinlong Yang ◽  
Wenlong Huo ◽  
Chi Kang
Keyword(s):  
Compressive Strength ◽  
Ph Value ◽  
Steel Slag ◽  
Raw Material ◽  
Solid Loading ◽  
Insulation Material ◽  
Ceramic Foams ◽  
Novel Approach ◽  
The Stability ◽  
First Time

A novel approach is used for fabricating steel slag foam ceramics based on the particle-stabilized foaming method. In this work, steel slag was used as the raw material and propyl gallate (PG) was used as the surface modifier. For the first time, steel slag ceramic foams were successfully fabricated based on particle-stabilized foams. The results show that the stability of the ceramic foams was closely related to the pH value and PG concentration. The porosity and compressive strength could be controlled by changing the solid loading of steel slag and sintering temperature. The porosity of steel slag foam ceramics ranged from 85.6% to 62.53%, and the compressive strength was from 1.74 MPa to 10.42 MPa. The thermal conductivity of steel slag foam ceramics was only 0.067 W (m·K)−1, which shows that it could be used as a thermal insulation material.

Laboratory Tests on Engineering Properties of Wind-Blown Sand

2012 ◽  
Vol 170-173 ◽  
pp. 706-709
Author(s):  
Zhao Lin Jia ◽  
Shu Wang Yan ◽  
Zhi Liang Huo
Keyword(s):  
Water Content ◽  
Laboratory Tests ◽  
Fine Sand ◽  
Engineering Properties ◽  
Grain Composition ◽  
Factors Affecting ◽  
Compaction Curve ◽  
Main Factors ◽  
Dry And Wet Conditions ◽  
Compaction Properties

By means of laboratory tests and theoretical calculation, the physical, mechanical properties and compaction mechanism of the wind-blown sand are studied to deal with the problem of how to use the wind-blown sand as roadbed materials. It is revealed that water content doesn’t affect the compressibility and the shear strength of the wind-blown sand obviously and the wind-blown sand can be compacted both in dry and wet conditions. The compaction curve of the ordinary fine sand is consistent with that of wind-blown sand and the main factors affecting the compaction properties are the grain composition, water content and compaction work.

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