Análise da conformidade de lotes de concreto para diferentes resistências com aplicação de estatísticas: estudo de caso
The main objective of technological control of concrete is to improve quality, safety and efficiency in construction. This results in obtaining more homogeneous batches, promoting more robust and durable structures, contributing to the prevention of structural failures and reducing costs. It is k...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/55598 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | The main objective of technological control of concrete is to improve quality, safety and
efficiency in construction. This results in obtaining more homogeneous batches, promoting
more robust and durable structures, contributing to the prevention of structural failures and
reducing costs. It is known that to carry out this monitoring, all processes that affect the final
quality of the concrete must be evaluated, from planning the work to its final use. ABNT
12655:2015 is the main standard regarding to the process for preparing, controlling, receiving
and accepting concrete, and is constantly addressed. In view of the above, the present work
collected compressive strength results from batches of machined concrete of classes C25 and
C30, used in a multi-family residential building, in the city of Natal, Rio Grande do Norte, with
the main objective of evaluating whether the batches were in compliance, using the principles
of the standards covered and applying graphs and statistics of average, median, patterndeviation, variance, range and variation coefficient to compare the concrete batches and identify
possible causes of their compliance or non-compliance. It was found that all batches were
accepted, as estimated compressive strength was greater than strength specified in the project
for all cases, and, therefore, the increase in resistance class did not imply a lesser or greater
acceptance of the lots. The averages observed were 29.91 MPa for class C25 and 32.50 MPa
for class C30, indicating values above expectations. However, procedural failures were
observed by the companies responsible for the execution, concreting and tests carried out, such
as the molding of only one test specimen for each failure age and the lack of consistency testing
in most cases. This may have resulted in the high ranges observed, of 9.80 MPa for class C25
and 7.95 MPa for class C30, and raised suspicions about the reliability of the results for class
C25, which presented a variation coefficient of 10.41%, classifying the test as deficient, while
in class C30, with a variation coefficient of 3.96%, the test was evaluated as very good. Thus,
as the concrete class increased, the results obtained were more reliable. Therefore, the
importance of correctly carrying out technological control, as well as its greater dissemination
and awareness within the scope of Civil Engineering, becomes evident. |
|---|