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Study of the aggregate quality influence on the durability of concretes
Luleå University of Technology, Department of Engineering Sciences and Mathematics.
2017 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The study of the aggregate quality influence on the concrete durability is achieved as part of the solution research against the good quality aggregates impoverishment. The project developed in this report aims to determine the impact of code B aggregates on the durability and the mechanical properties of concretes. The three types of low quality aggregates that are studied in this master thesis are aggregates that have high absorption coefficients (code B Ab≈4%), flat aggregates (code B FI=22 or 32) and weak aggregates against fragmentation (LA≈37%).

The report presents a huge part of the CUS project until the first durability and mechanical results of the concretes at 28 days. After the review of the literature it present the preliminary step before the manufacturing of the concretes. It goes through the testing of the components before utilization and the formulation of the concretes. In order to study the impact of the three types of aggregates mentioned above five concretes is manufactured. During the processing of the concrete certain properties of the fresh concrete needs to be regulated and are analyzed in the report.

The concretes are manufactured from reference concrete of the PERFDUB project. Actually, the CUS concretes are formulated with the same components than their reference concrete excepted for the aggregates that are replaced with ones of lower quality. In this way, it highlights their impact on the concrete properties. The properties of the aggregates presented on this report are determined through compression resistance tests, different penetrability tests and chloride penetration tests.

The results show that the weak aggregates to fragmentation impact the mechanical properties of the concrete. The concrete B5 that is composed of this type of aggregates present a compression resistivity of 52.3MPa, when the concrete used as comparison has a resistivity amounting to 81MPa.

The aggregates with code B water absorption coefficients seem to be harmful for the concretes in terms of durability. This is notably due to the penetrability of the concrete that is fostered by the utilization of such aggregates. This is particularly noticeable on the permeability test. Actually, the concrete B1 that is composed by aggregates having low absorption coefficient present a permeability coefficient going up to 4.92E-16m2 comparing to its comparison concrete that only gets a value of 6.42E-17m2.

The results obtained from the flat aggregates seems to indicate that the impact of this type of compounds in concrete is low. 

Place, publisher, year, edition, pages
2017. , p. 61
Keywords [en]
Concretes, aggregates, durability
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-65871OAI: oai:DiVA.org:ltu-65871DiVA, id: diva2:1145370
Educational program
Materials Engineering, master's level
Supervisors
Examiners
Available from: 2017-10-13 Created: 2017-09-28 Last updated: 2017-10-13Bibliographically approved

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  • apa
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