Submitted by Larissa Vitoria Cardoso Cusielo (larissavitoria@id.uff.br) on 2017-05-12T18:45:12Z No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Celso Ponchio - Dissertacao final.pdf: 3773699 bytes, checksum: dbd199af5614502049fbece45a610e7c (MD5) APÊNDICE 1 - 18-10-2016.pdf: 228472 bytes, checksum: 7881892d315e4ab4368d0460c0380876 (MD5) APÊNDICE 2.pdf: 543831 bytes, checksum: 4ebe460790831243b33f988a0dadbaff (MD5) / Rejected by Biblioteca do Aterrado BAVR (bavr@ndc.uff.br), reason: oi on 2017-05-22T16:24:35Z (GMT) / Submitted by Larissa Vitoria Cardoso Cusielo (larissavitoria@id.uff.br) on 2017-05-22T17:11:14Z No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Celso Ponchio - Dissertacao final.pdf: 3773699 bytes, checksum: dbd199af5614502049fbece45a610e7c (MD5) APÊNDICE 1 - 18-10-2016.pdf: 228472 bytes, checksum: 7881892d315e4ab4368d0460c0380876 (MD5) APÊNDICE 2.pdf: 543831 bytes, checksum: 4ebe460790831243b33f988a0dadbaff (MD5) / Approved for entry into archive by Biblioteca do Aterrado BAVR (bavr@ndc.uff.br) on 2017-08-21T15:57:44Z (GMT) No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Celso Ponchio - Dissertacao final.pdf: 3773699 bytes, checksum: dbd199af5614502049fbece45a610e7c (MD5) APÊNDICE 1 - 18-10-2016.pdf: 228472 bytes, checksum: 7881892d315e4ab4368d0460c0380876 (MD5) APÊNDICE 2.pdf: 543831 bytes, checksum: 4ebe460790831243b33f988a0dadbaff (MD5) / Made available in DSpace on 2017-08-21T15:57:44Z (GMT). No. of bitstreams: 4 license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Celso Ponchio - Dissertacao final.pdf: 3773699 bytes, checksum: dbd199af5614502049fbece45a610e7c (MD5) APÊNDICE 1 - 18-10-2016.pdf: 228472 bytes, checksum: 7881892d315e4ab4368d0460c0380876 (MD5) APÊNDICE 2.pdf: 543831 bytes, checksum: 4ebe460790831243b33f988a0dadbaff (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / Universidade Federal Fluminense. Instituto de Ciências Exatas. Programa de Pós-Graduação em Ensino de Física. Volta Redonda,RJ. / Este trabalho descreve a elaboração, aplicação e avaliação de uma sequência didática para o ensino dos conceitos de dilatação térmica no ensino médio explorando experimentos demonstrativos. O produto apresentado é composto por um kit formado por quatro experimentos demonstrativos, a saber, acionamento de campainha por dilação de barra metálica, dilatação anel metálico com esfera, lâminas com dois materiais mostrando curvatura da lâmina e modelo de estrutura cristalina, além de um roteiro de atividades. O produto educacional está ancorado na Teoria de Aprendizagem Significativa, de Ausubel e busca interagir com os conhecimentos prévios dos alunos, através de atividades que relacionam os conceitos com consequências cotidianas. O material foi elaborado para ser aplicado em dois tempos de 50 minutos, em acordo com a reduzida carga horária da disciplina de Física nesta modalidade de ensino. O produto foi aplicado em colégio da rede estadual de ensino no Estado do Rio de Janeiro e o resultado da análise mostrou envolvimento dos alunos nas atividades e bom desempenho dos alunos nas mesmas. Acreditamos que o produto seja potencialmente significativo. / This work describes the elaboration, application and evaluation of a didactic sequence to teach linear dilation of materials in high school level. The educational product is composed by four demonstrative experiments namely bar dilation, ring dilation, bi-material strip, and a crystalline structure model. The experiments are followed by a sequence of activities which relies the physical concepts with quotidian situations. Our work is based on the Theory of Meaningful Learning, from David Ausubel. The activities requires interaction between previous knowledge and concrete situations in order to contribute to a meaningful learning. The resulting educational product was applied in a High School institution of the network of Rio de Janeiro State. The application time is two fifty minutes class, performing a hundred minutes, which is appropriate to the physical class in this level of teaching. The results of our analysis of the application show that our product is potential meaningful to teach thermal dilation

This thesis presents how to establish a theoretical model to predict risk of thermal cracking in young concrete when cast on ground or an arbitrary construction. The crack risk in young concrete is determined in two steps: 1) calculation of temperature distribution within newly cast concrete and adjacent structure; 2) calculation of stresses caused by thermal and moisture (due to self-desiccation, if drying shrinkage not included) changes in the analyzed structure. If the stress reaches the tensile strength of the young concrete, one or several cracks will occur. The main focus of this work is how to establish a theoretical model denoted Equivalent Restraint Method model, ERM, and the correlation between ERM models and empirical experiences. A key factor in these kind of calculations is how to model the restraint from any adjacent construction part or adjoining restraining block of any type. The building of a road tunnel and a railway tunnel has been studied to collect temperature measurements and crack patterns from the first object, and temperature and thermal dilation measurements from the second object, respectively. These measurements and observed cracks were compared to the theoretical calculations to determine the level of agreement between empirical and theoretical results. Furthermore, this work describes how to obtain a set of fully tested material parameters at CompLAB (test laboratory at Luleå University of Technology, LTU) suitable to be incorporated into the calculation software used. It is of great importance that the obtained material parameters describe the thermal and mechanical properties of the young concrete accurately, in order to perform reliable crack risk calculations.  Therefore, analysis was performed that show how a variation in the evaluated laboratory tests will affect the obtained parameters and what effects it has on calculated thermal stresses.