Revisão de Tecnologia do Concreto - Questões

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Tecnologia do Concreto – exercícios de revisão
1. Defina exsudação.
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2. O que é o tempo de início de pega do cimento? Qual é a importância desse conceito na prática das construções?
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3. Quais são as principais propriedades físicas do cimento Portland?
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4. É correto dizer que a finura determina a velocidade da reação de hidratação? Por quê?
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5. Cite 3 finalidades da utilização dos agregados no concreto.
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6. Descreva, em poucas palavras, os ensaios de densidade e granulometria.
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7. O que difere os aglomerantes quimicamente inertes dos ativos?
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8. Qual é a diferença entre concreto, pasta, argamassa e nata?
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9. Por que o cimento é considerado um aglomerante hidráulico?
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10. Cite 5 propriedades físicas dos agregados.
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11. O que é o inchamento da areia?
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 12. O que são aglomerantes?
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13. Quais são os tipos de aglomerantes quimicamente ativos? O que difere entre eles?
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14. Cite alguns fatores que podem afetar a pega.
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15. O que é o calor de hidratação do cimento?
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16. Cite os principais tipos de concreto, 2 características e 2 aplicações dele na construção civil.
CP I/CP I-S:______________________________________________________________________________
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CP II-Z:_________________________________________________________________________________
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CP II-E:_________________________________________________________________________________
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CP III:__________________________________________________________________________________
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CP IV:__________________________________________________________________________________
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CP V-ARI:_______________________________________________________________________________
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CP RS:__________________________________________________________________________________
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CP BC:__________________________________________________________________________________
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CP B:___________________________________________________________________________________
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17. Qual é a função do gesso no cimento?
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18. Como são classificados os agregados?
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19. Cite 4 agregados artificiais e uma aplicação deles.
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20. Etapas da pega do cimento.
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21. O que se entende por expansibilidade do cimento?
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22. Quais são as funções da água na obra?
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23. Por que a água não pode apresentar impurezas?
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24. O que é compacidade?
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25. O que são aditivos? E quais são as suas finalidades?
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26. Quais são as classificações dos aditivos?
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27. O que é o concreto?
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28. O concreto não é tão duro e nem tão resistente quanto o aço. Por que, então é tão utilizado como material de engenharia? Cite três razões.
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29. Cite as principais propriedades do concreto no estado fresco.
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30. Cite as principais propriedades do concreto no estado endurecido.
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31. O que é o lançamento do concreto?
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32. O que é a consolidação do concreto?
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33. Por que motivo deve-se vibrar o concreto?
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32. Defina cura do concreto.
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33. Principais métodos de cura.
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34. Como se chama o início do processo de hidratação do cimento?
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35. Quanto mais resíduo fica na peneira, de acordo com a norma, melhor o cimento quanto a resistência. Verdadeiro ou falso. justifique.
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36. Qual é a diferença entre massa unitária e massa específica?
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37. Qual é o ensaio utilizado para verificar a coesão dos componentes do concreto?
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38. Quais fatores são determinantes no que diz respeito a resistência do concreto?
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39. O que é fck?
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40. Quais as vantagens de se realizar uma boa consolidação do concreto?
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41. Complete:
a)________________________ É a operação que consiste em colocar o concreto nas fôrmas.
b)________________________Pode ser executado por processos manuais ou mecânicos.
c)________________________ Operação que consiste em evitar a retração hidráulica nas primeiras idades do concreto, quando sua resistência ainda é pequena.
42. O que mede o aparelho de Vicat? e para que é utilizada a sonda de Tetmajer?
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43. Qual é a massa unitária da areia usada no ensaio em que o volume dos grãos, contido em um recipiente de 15 dm³, é de 8,25 dm³ e sua massa específica é de 2,62 kg/dm³?
44. Qual é a massa de água que existe em 90 kg de areia com umidade de 3,2%?