José Nivaldo Garcia

University of São Paulo | USP

Our goal was to determine physical properties and anatomical features in 33-year-old Hevea brasiliensis clones. We cut wood samples from clones LCB510, RRIM600, IAN873, IAN717 and GT1 planted in Selvíria, Mato Grosso do Sul, Brazil. We used standard techniques in wood studies. We found that clones differ in basic density, volumetric shrinkage and a...

Context: Timber construction is not among the most popular options due to cultural issues in Brazil. Timber housing standards and costs remain uncertain subjects, and this study seeks to investigate these secular gaps. Method: Basic unitary costs for different finishing standards and production types were measured through face-to-face interviews le...

This paper evaluated the participation of the Brazilian timber house producers in technical and scientificevents related to their activities, whose fields include products, manufactures and technologies of timber andforest resources for construction. This present study utilized semi structured face-to-face interview method toevaluate the participat...

To identify the time spent with the different construction techniques of timber houses, this study evaluates the execution time of different models available in Brazil. Using face-to-face interviews, semi-structured questionnaires were randomly applied to collect average time according to distinct production methods. The most efficient techniques w...

This study aimed to analyze the properties of 38-year-old Cariniana legalis wood from trees planted with three spacings between trees: 3 × 2.5, 3 × 2, and 3 × 1.5 m. Five trees were collected from each tree spacing. Discs were collected from the trunk base of each tree and at 2.5 and 5.0 m. The vessel diameter was significantly wider for a spacing...

Timber consumption is a complex discussion for the industry, in part because the issue has been marked by doubts about lineage and origin. This paper aimed to identify challenges related to species, origins and wood use in the Brazilian construction sector. Searches on corporate websites and face-to-face interviews were used to identify involvement...

The first forestry schools were created in the Western Europe in the mid-eighteenth Century. In the late of 19th Century, Forest Education was structured to intervene in forestry ecosystems and ensure the sustainable management of their resources. Thus, forestry chain advanced in the quest for higher value and quality solutions. In the early of 20t...

Competition and efficiency for better products have forced the industry improvement. Advisory and consulting emerged to assist in the error correction and the objectives performance. This paper evaluated the access to social services by Brazilian timber house producers. Personal interviews were used to collect the data. Most of this sector still do...

Eucalypts are the most planted hardwood in the world, with 30 million ha. under cultivation. There are approximately 700 species of eucalypts, but more than 90 % of the plantations are concentrated in nine species of the Subgenus Symphyomyrtus in the Sections Exsertaria, Latoangulatae and Maidenaria. Since 2000, with the advancement of biotechnolog...

Worldwide, wood and its composites act as underlying raw materials for construction, due to their features. Brazil has produced many scientific studies and building examples about timber construction, but this scenario is still reasonable compared to those developed nations. Despite this promising status, the country lacks construction solutions ad...

Corporate representativeness is an important issue for engineering and its industrial sectors, considering that producer associations can defend represent the rights and ambitions of their members. This study aims to investigate timber housing producer participation in generalist organizations, as well as to identify which examples of class entitie...

This paper is based on an evaluation of the industrialization levels and main production systems of Brazilian timber housing producers. Two methods were used to investigate this understudied topic. Literature-based projection was carried out to identify the production system of each sampled company, from the construction technique(s) produced by th...

This paper aimed to analyse timber houses produced in Brazil, identifying the main market locations. In this unprecedented insight, an interview survey was carried out by a semi-structured questionnaire applied on respective producers. First question was developed to estimate quantitatively the annual Brazilian production of timber houses for a tri...

Using face-to-face interviews and semi-structured questionnaires with timber housing developers, this study assed the perceptions of respective industries about government stimuli and public policies towards timber construction in Brazil. Four questions were developed under qualitative aspects, which were percentually measured to enable a response...

Bamboo canes are a unique construction raw material for several types of structures, and there is a growing acceptance of bamboos for structural uses. However, they have as a disadvantage their propensity to attack by insects. In this work, a study of the effectiveness of three different types of preservatives was made with: 1) traditional chemical...

On account of the lack of education of Brazilian worker, this paper analyzed the characteristics of those professionals working in the production sector of timber houses. A sectoral survey was carried out with respective entrepreneurs to investigate the available professionals (career and contract types), evaluate the demands of skilled workers, an...

This paper analyzes the representativeness of timber housing in Brazil, identifying the percentage of construction techniques offered by each evaluated company. Percentages that evidence the frequency of use of wooden building techniques were measured using two methods applied in the companies: survey through face-to-face interviews with owners and...

In the current competitive market, production efficiency and product quality are prioritized by the whole industry. Machinery characterization is an understudied topic, particularly in those sectors focused on basic raw material production, processing, and/or heavy industrialization. For this reason, the wooden housing sector requires evaluation to...

In Brazil, Hevea brasiliensis plantations are principally destined for latex production. In the national literature however, there are few studies on the mechanical properties of rubberwood. This study aimed to evaluate the potential of rubberwood in the manufacture of glulam beams (VLC), through the use of pieces of sawn wood of H. brasiliensis cl...

We studied the relationships among wood anatomy, hydraulic conductivity, density and shear parallel to the grain in the stem of Handroanthus vellosoi trees with the goal to identify possible trade-offs between hydraulic conductivity and mechanical properties. For this study we felled 12 trees with 24-year-old and cut 10-cm-thick disks at three heig...

The manufactured wood products are essential to modern society, since they are made from renewable and recyclable raw material, characterizing a sustainable input. The objective of this study was to elucidate the importance of wood from planted forests in forest products manufacture of higher added value, addressing forest and wood contexts of topi...

Despite the promising future to industry in Brazil, most production sectors still suffer with the access to newer industrial technologies. Some very specific and limited incentives have been offered by the local Government to stimulate these companies. However, the forestry-timber sector hardly has access them, due to the several barriers and burea...

The building technique of light wooden framing, i.e., woodframe, represents a great innovative goal of construction, due to the very efficient levels of rationalization of material, operational flexibility and productive agility. In addition, excessive use of natural materials of renewable character in the woodframes, as the wood of planted forests...

Wooden housing is one of the most sustainable building alternatives. In many European and North American countries, wooden houses provide the most common, economical, and practical solution for construction. The timber buildings present adequate levels of durability, acoustics, and thermal comforts. Despite their popularity, wood houses do not have...

Wood is a very versatile and easily renewable material, characteristics which enable its industrial transformation into high technology composites. Brazil has experienced an increasing use of these composites in furniture and construction industries. The building applications of wood-based structural composites have great range, both for metal and...

We investigated the axial variation of specific gravity, shear parallel to the grain and anatomical features of Astronium graveolens wood and related these properties to the anatomy along the stem. We felled five 20-year-old trees and cut discs from four different stem heights, including stem base, 1 meter, 2 meters and 3 meters, for a total of 20...

The inconvenience with the generation of wood waste has become an increasing problem among companies of the forestry sector. For that reason, the study aimed to obtain and disseminate the data on the generation and disposal of timber waste of the wooden-housing manufacturers, located in São Paulo State, aiming to assist them on the potential for re...

Hevea brasiliensis (Willd. ex Adr. Juss.), a seringueira, é utilizada para a produção de látex e, ao final do ciclo produtivo, a madeira também pode ser aproveitada. Dessa maneira, o melhoramento genético visa aumentar a produção tanto de látex quanto de madeira. Este estudo teve por objetivo determinar a variabilidade genética, o controle genético...

We investigated the effect of diameter class on the wood anatomy and properties of 24-year-old Liquidambar styraciflua to determine the potential wood quality in three different diameter classes: large (33cm), medium (26.5cm), and small (22.4cm). We hypothesize that different diameter classes have wood variations with potential distinct qualities....

The economic exploitation of rubber tree (Hevea brasiliensis) usage is primarily directed toward latex extraction. After the productive life of the rubber tree forest, the managed area is harvested for planting reformulation. The harvested wood is most often used for energy generation purposes. The aim of this work was to study the feasibility of u...

The objective of this work was to evaluate the effect of the addition of bamboo laminas of the species Dendrocalamus giganteus to three-layer medium density particleboard (MDP). These laminas were glued onto both the top and the bottom of each panel. With the manufactured panels laminated with bamboo, mechanical tests based on the Brazilian Standar...

The timber production chain in Brazil still suffers with several difficulties related to the waste management. Most sectors within this timber chain never account or classify their waste. It is a chronic problem present in all of Brazilian States, whereas the local Governments never stimulated industrial clusters with assertive policies to mitigate...

The waste generated by industries has been an environmental problem to be solved, even in timber chain, whereas the wood has a high potential of reuse. This paper aimed to collect and disseminate the data obtained on lignocellulosic waste generation produced by manufacturers of wood houses located at Brazilian state of Paraná. This information coul...

Bamboo is a renewable material that has been gaining attention in several sectors of production and research because of its potential. Its special characteristics of rapid growth, short harvest cycle, diversity and excellent mechanical properties. The objective of this work was a physical-mechanical analysis of flooring manufactured by a combinatio...

This work aimed to study the feasibility of using castor oil-based polyurethane (PU) resin, and rubberwood for the production of particleboards. Multilayer panels were produced using particles taken from RRIM 600 and GT1 clones of Hevea brasiliensis trees. Urea-formaldehyde (UF) and PU were used for bonding the particles. Physico-mechanical charact...

Por quase 200 anos, a madeira de Caesalpinia echinata tem sido referência para arcos modernos. No entanto, a ameaça de extinção e a proibição comercial têm motivado os arqueteiros a buscar madeiras alternativas. A hipótese testada foi a de que madeiras com propriedades físicas, mecânicas e acústicas semelhantes às de C. echinata, teriam grande pote...

The growth stresses of trees can be evaluated by means of the analysis of the end splitting on green and dry boards. Thus, this work aimed to study the evolution of the splitting length during the process of natural drying in the sawn wood of 24-year-old Liquidambar styraciflua, as a function of different diameter classes (upper, middle and lower)...

As tensões de crescimento das árvores podem ser avaliadas por meio da análise das rachaduras de extremidade observadas em pranchas verdes e secas. Dessa forma, este trabalho teve como objetivo estudar a evolução do comprimento das rachaduras, durante o processo de secagem natural da madeira serrada de Liquidambar styraciflua, de 24 anos, em função...

A norma brasileira NBR 7190/1997 estabelece que os ensaios de flexão estática devam ser feitos com três ciclos de carregamento com base na carga de ruptura estimada através de um corpo-de-prova gêmeo. O projeto de revisão da NBR 7190/2010 propõe a supressão do terceiro ciclo para este ensaio. O presente trabalho teve como objetivo avaliar a influên...

The effect of the fertilization in the amount and quality of the produced wood is one of the questions to be considered in the research of the Eucalyptus grandis. The present work aimed to evaluate the fertilization effect in the mechanical properties of Eucalyptus grandis. The population of Eucalyptus grandis was 21 years old and was managed under...

The effect of the fertilization in the amount and quality of the produced wood is one of the questions to be considered in the research of the Eucalyptus grandis. The present work aimed to evaluate the fertilization effect in the mechanical properties of Eucalyptus grandis. The population of Eucalyptus grandis was 21 years old and was managed under...

Resumo O uso de espécies do gênero Eucalyptus, como madeira serrada, já é uma realidade, porém estudos de técnicas silviculturais que podem influenciar no aproveitamento da madeira serrada tornam-se necessários. O presente trabalho teve como objetivo estudar a influência do desbaste e da fertilização na porcentagem de casca e na conicidade de toras...

The ideal spacing between trees in order to obtain higher proportion and better quality of wood is one of the issues to be considered in research on forest management of Tectona grandis (teak), which is characterized by the productivity and quality of its wood. This study aimed to investigate the influence of spacing on some mechanical properties a...

The use of fertilization in forest stands results in yield gains, yet little attention has been directed to its potential effects on the quality of wood produced. Information is scarce about the effect of fertilization on anatomical structures of older Eucalyptus wood. This work aims to study the effect of fertilization on tissue cell size of wood...

A determinação das propriedades da madeira para projetos de estruturas deve ser feita com base nos métodos de ensaios definidos pela NBR7190/1997 da ABNT. Para a caracterização mínima da resistência de uma espécie devem ser ensaiados 12 corpos-de-prova retirados de um lote de madeira serrada de volume não superior a 12 m³. O presente estudo teve co...

O adesivo representa um papel determinante na resistência mecânica da madeira laminada colada (MLC), sendo a correta escolha e sua correta aplicação de vital importância para a qualidade mecânica do produto final. O presente trabalho teve como objetivo avaliar a eficiência de quatro adesivos na resistência ao cisalhamento no plano de cola de seções...

The Eucalyptu grandis stands apart for its productivity and quality wood. The ideal forest management where a greater wood ratio and better quality are obtained is one of the questions to be considered in the research of the E. grandis. The present work had as its general objective the study of the variation of the specific gravity and the resistan...

2 2 3 4 2 2 2 RESUMO ABSTRACT – A utilização de teste de procedência pode fornecer informações sobre o comportamento silvicultural de populações de uma determinada espécie, também permite a estimativa de parâmetros genéticos de características de interesse econômico, seleção de material genético para diferentes locais, exploração da variabilidade e...

The aim of this study was to analyse the influence of thinning and fertilization on some log properties which influence sawn wood yield in a 21 year-old grown Eucalyptus grandis stand. Three selective thinning intensities (37, 50 and 75%), presence or absence of fertilizers on the beginning of the thinning, two diameter classes and two logs taken f...

The aim of this study was to analyse the influence of thinning and fertilization on some log properties which influence sawn wood yield in a 21 year-old grown Eucalyptus grandis stand. Three selective thinning intensities (37, 50 and 75%), presence or absence of fertilizers on the beginning of the thinning, two diameter classes and two logs taken f...

This research deals with the evaluation of the behavior of thermorectificated wood of Eucalyptus grandis, in relation itsdensity and shrinkage. To evaluate these aspects, it was used a totally random experimental outline, with 5 treatments (A - woodthermorectificated (wt) at 120 ºC; B wt at 140 ºC; C wt at 160 ºC; D wt at 180 ºC; E - wt at 200 ºC)...

This research deals with the evaluation of the behavior of thermorectificated wood of Eucalyptus grandis, in relation its density and shrinkage. To evaluate these aspects, it was used a totally random experimental outline, with 5 treatments (A - wood thermorectificated (wt) at 120 ºC; B wt at 140 ºC; C wt at 160 ºC; D wt at 180 ºC; E - wt at 200 ºC...

In this study, the breeding perspectives of 41 open-pollinated progenies of Eucalyptus grandis were evaluated based on their wood traits. The progenies were distributed in two experiments in a randomized complete block design, with three replicates and linear plots containing six plants each. The traits were assessed at eight years of age. Two tree...

In a stuffed furniture industry, located in the Piracicaba, SP, Brazil, panel samples (plywood and OSB) were randomly collected to determine bending strength and stiffness properties (MOR and MOE) in order to compare them and evaluate the possibility of direct substitution of plywood, traditionally used in furniture structural parts, for OSB. The m...

In a stuffed furniture industry, located in the Piracicaba, SP, Brazil, panel samples (plywood and OSB) were randomly collected to determine bending strength and stiffness properties (MOR and MOE) in order to compare them and evaluate the possibility of direct substitution of plywood, traditionally used in furniture structural parts, for OSB. The m...

ABSTRACT: Forty-one open pollinated progenies of Eucalyptus grandis, Luís Antonio, SP provenance (origin Atherton, Austrália), were evaluated in two Completely Random Block design with three replications, carried out at Altinópolis, SP, in the experimental area of Votorantim Celulose e Papel Company. A total of 242 trees (logs) were evaluated at 8...

RESUMO: Na realização desta pesquisa foram utilizados os dados individuais de densidade básica e volume da madeira, do número kappa da polpa, da lignina solubilizada, do custo de deslignificação e do rendimento bruto gravimétrico do processo de polpação, obtidos de 64 árvores de Eucalyptus grandis W. Hill ex Maiden, procedentes de uma população com...

Dissertação (Mestrado)--Escola Superior de Agricultura Luiz de Queiroz da Universidade de São Paulo.

Eucalyptus urophylla is one of the most planted species in Brazil, due to its wide use range and adaptation to several bioclimate areas of the country. The objective of this work was to verify the best origins/progenies from the Island of Flores, regarding productivity and the relationship between the productivity and the traits of tree bark and ar...

RESUMO: Este trabalho teve o objetivo de determinar propriedades físicas (densidade bási- ca e retratibilidade) e mecânicas (resistência à compressão paralela às fibras, resistência ao cisalhamento tangencial aos anéis de crescimento, módulo da resistência à flexão estática e módulo da elasticidade na flexão estática) da madeira de E. urophylla da...

RESUMO: Um teste de progênies de Eucalyptus urophylla com 19 anos de idade foi utilizado para quantificar a influência das tensões de crescimento e da conicidade no rendimento em madeira serrada. Foram selecionadas seis árvores por progênie (duas árvores por parcela em três repetições). As tensões de crescimento foram mensuradas de maneira indireta...

RESUMO: Foram utilizadas árvores de um plantio comercial de Eucalyptus saligna Smith de 22 anos, que de acordo com o tipo e proporção de casca apresentados, foram denominadas "Tipo Saligna", quando portadoras de casca totalmente lisa; "Tipo Meia-casca", quando o tronco apresentasse casca rugosa em pelo menos 20% até o máximo de 60% da altura do fus...

This paper studied the influence of forestry practices on some technological quality of sawn wood from a 21 years old grown Eucalyptus grandis stand treated by selective thinning and fertilizers application, just after the first thinning when the stand was 5 years old. The three thinning intensities (37, 50 and 75%), presence or absence of fertiliz...

RESUMO: O presente estudo foi conduzido a partir de dois testes de progênies de Eucalyp- tus grandis, com o objetivo de se investigar os padrões de variação na direção longitudinal das árvores quanto a algumas características de qualidade da madeira para finalidade de serraria, bem como determinar os indicadores de qualidade mais apropriados. Os ex...

RESUMO: Para a realização do trabalho foram empregadas 41 progênies de polinização aberta de Eucalyptus grandis procedência Luís Antônio (origem Atherton, Austrália), arranja- das em dois experimentos em Blocos ao Acaso com três repetições, instalados em Altinópolis, SP, na área experimental da empresa Votorantim Celulose e Papel. As avaliações for...

In an eighteen-year old Eucalyptus grandis Hill ex-Maiden population, five plots of an experiment managed according to the CCT (Correlated Curve Trend) thinning method were evaluated. The variable studied was the tree growth stress evaluated indirectly through the log and lumber end splitting and lumber deflection characteristics. The log end split...