The present dissertation research examined the effects of applying the enhanced hands-on intervention to reveal and correct student misunderstandings of the concepts in engineering dynamics, especially particle dynamics. We involved 36 student volunteers for three different research topics. The student participants were divided into two groups in each research topic: enhanced hands-on intervention and pure textbook groups. An interview and intervention was conducted with each participant individually. The author introduced the “Think-Aloud” method with two kinds of interventions mentioned above. The participants were required to speak out their thought process loud as they worked on the two sets of assessment questions with intervention between them, and the entire process was audio and video recorded. The audio records were transcribed into text files and segmented with meaningful codes. In all of the codes, the relationship between misconceptions found and potential reasons for these misconceptions were revealed. The effects were assessed by qualitative and quantitative research methods. Statistical analysis of the coding results verified the efficacy of the coding process. The qualitative research focused on the reasoning progress of the participants and the quantitative research focused on the score increase rates and normalized learning gains of the participants in both intervention groups. It was found that the groups who utilized the enhanced hands-on intervention achieved a better performance than those who accepted only textbook interventions in score increase rates, normalized learning gains, and code reduction rates, for all three research topics. In addition, the enhanced hands-on intervention showed a higher effectiveness than the textbook intervention for lower-level concepts, but it was harder to correct those misconceptions related to applications with higher abstraction of the concept itself. From the results of the normalized learning gains, the enhanced hands-on intervention benefitted the top students more than the struggled students. The research results suggested that the enhanced hands-on intervention should be added to the current engineering curricula in order to help students to improve their academic performance.

Resumo: O bom comportamento das estruturas de concreto armado é assegurado pelo fenômeno da aderência existente entre o aço e o concreto, garantindo que os materiais trabalhem em conjunto formando, assim, um conjunto solidário. Esse trabalho apresenta os resultados dos ensaios de tração direta, segundo a ABNT/NBR 7477 e de arrancamento normalizado pela CEB RC6 e referido também na ASTM C-234, realizados com concreto convencional e com concreto contendo 10% de resíduo de borracha em substituição a areia, em volume, nas idades de 28 e 90 dias. As barras de aço utilizadas neste trabalho foram do tipo nervuradas e com os diâmetros variando entre 10, 12,5 e 16 mm. Com a introdução dos resíduos de borracha no concreto, foi avaliado o comportamento das mesmas em sua composição e a viabilidade da utilização estrutural desse tipo de concreto como material de construção, em substituição ao concreto convencional. Os resultados obtidos através dos ensaios de aderência confirmam ma viabilidade da utilização do resíduo de borracha em substituição ao agregado miúdo em concreto, segundo a composição adotada. / Abstract: The good behavior of the structures of concrete reinforced is assured by the phenomenon of the existing bond between the steel and the concrete, guaranteeing that the materials work in set forming, thus, a solidary set. This work presents the results of the assays of direct traction, according to ABNT/NBR 7477 and of pulling up normalized for CEB RC6 and also related in the ASTM C-234, carried through with conventional concrete and concrete I contend 10% of rubber residue in substitution the sand, volume, the ages of 28 and 90 days. The used bars of steel in this work had been of the type with rib and with the diameter varying between 10, 12,5 and 16 mm. With the introduction of the rubber residues in the concrete, it was evaluated the behavior of same in its composition and viability of the structural use of this type of concrete as material of construction, in substitution to the conventional concrete. The results gotten through the bond assays confirm me the viability of the use of the rubber residue in substitution to the small aggregate in concrete, following the adopted composition. / Orientador: Mônica Pinto Barbosa / Coorientador: Jorge Luis Akasaki / Banca: Vitor Antonio Ducatti / Banca: Haroldo de Mayo Bernardes / Mestre

Made available in DSpace on 2014-06-11T19:25:21Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-08-10Bitstream added on 2014-06-13T20:53:09Z : No. of bitstreams: 1 franca_vh_me_ilha.pdf: 3046692 bytes, checksum: e6bee58e13b985073849417fdadcea71 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Araca Renovadora de Pneus / Cesp / Holcim do Brasil S.A / O bom comportamento das estruturas de concreto armado é assegurado pelo fenômeno da aderência existente entre o aço e o concreto, garantindo que os materiais trabalhem em conjunto formando, assim, um conjunto solidário. Esse trabalho apresenta os resultados dos ensaios de tração direta, segundo a ABNT/NBR 7477 e de arrancamento normalizado pela CEB RC6 e referido também na ASTM C-234, realizados com concreto convencional e com concreto contendo 10% de resíduo de borracha em substituição a areia, em volume, nas idades de 28 e 90 dias. As barras de aço utilizadas neste trabalho foram do tipo nervuradas e com os diâmetros variando entre 10, 12,5 e 16 mm. Com a introdução dos resíduos de borracha no concreto, foi avaliado o comportamento das mesmas em sua composição e a viabilidade da utilização estrutural desse tipo de concreto como material de construção, em substituição ao concreto convencional. Os resultados obtidos através dos ensaios de aderência confirmam ma viabilidade da utilização do resíduo de borracha em substituição ao agregado miúdo em concreto, segundo a composição adotada. / The good behavior of the structures of concrete reinforced is assured by the phenomenon of the existing bond between the steel and the concrete, guaranteeing that the materials work in set forming, thus, a solidary set. This work presents the results of the assays of direct traction, according to ABNT/NBR 7477 and of pulling up normalized for CEB RC6 and also related in the ASTM C-234, carried through with conventional concrete and concrete I contend 10% of rubber residue in substitution the sand, volume, the ages of 28 and 90 days. The used bars of steel in this work had been of the type with rib and with the diameter varying between 10, 12,5 and 16 mm. With the introduction of the rubber residues in the concrete, it was evaluated the behavior of same in its composition and viability of the structural use of this type of concrete as material of construction, in substitution to the conventional concrete. The results gotten through the bond assays confirm me the viability of the use of the rubber residue in substitution to the small aggregate in concrete, following the adopted composition.