Praktyczne metody doboru optymalnych krzywych uziarnienia kruszywa do betonu drogowego w USA

• Autorzy: Rudy A. , Olek J.
• Języki publikacji: PL

Abstrakty

PL

Dobór optymalnego uziarnienia kruszywa ciągle stanowi ważny aspekt projektowania składu mieszanek betonu drogowego. Choć mieszanki o maksymalnej gęstości uziarnienia powinny być teoretycznie tańsze i mniej podatne na skurcz wysychania (z uwagi na zmniejszoną ilość zaczynu), w praktyce są one zbyt sztywne i źle urabialne. Połączenie trzech praktycznych metod doboru uziarnienia kruszywa przedstawionych w artykule pozwala na racjonalny wybór krzywych uziarnienia, które zapewnią dobrą urabialność i trwałość betonu.

EN

The paper presents a comprehensive review of three practical methods used for selection of optimal aggregate gradation curves for rigid pavement concretes in the USA. These methods include the Shilstone’s Coarseness Factor (CF) chart, the 18-8 gradation band and the 0.45 power plot. Of the three methods presented, the CF chart is most widely used in practice as it allows for quick selection of well-graded aggregate that reduces the amount of paste in the mix, improves workability and increases durability. However, it is recommended that all three of the presented methods be tried at the mixture design stage in order to offset potential shortcomings of any of the individual approaches and minimize potential workability and performance problems.

Słowa kluczowe

PL

beton drogowy; uziarnienie kruszywa; USA; krzywa uziarnienia kruszywa

• Wydawca: ELAMED Media Group
• Czasopismo: Magazyn Autostrady
• Rocznik: 2009
• Tom: Nr 4
• Strony: 48--55
• Opis fizyczny: Bibliogr. 21 poz., fot., rys.

Twórcy

autor

Rudy A.

• Wydział Inżynierii Lądowej, Purdue University, Indiana, USA

autor

Olek J.

• Wydział Inżynierii Lądowej, Purdue University, Indiana, USA

Bibliografia

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• 3. American Concrete Pavement Association (ACPA): Concrete Pavement Field Reference; Pre-paving. EB237P, 2007, Skokie, Illinois.
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• 12. ASTM C 33-07a: Standard Specification for Concrete Aggregates. „Annual Book of ASTM Standards”, vol. 04.02, American Society for Testing and Materials, West Conshohocken, Pennsylvania, 2007.
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• 18. Department of Defense: Concrete Pavement for Airfields and Other Heavy- Duty Pavements. „Unified Facility Guide Specification: UFGS 2753”, 2004.
• 19. Iowa Department of Transportation (IDOT): Aggregate Proportioning Guide for PC Concrete Pavements: IM 532. Office of Materials, 2007.
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• 21. Hanson T.: Iowa’s Experience Utilizing Optimum Concrete Paving Mixtures, „Proceedings of the International Conference on Optimizing Paving Concrete Mixtures and Accelerated Concrete Pavement Construction and Rehabilitation”, 2007, Atlanta, Georgia.