Influence of Aggregate Properties on Effectivness of Interlock Joints in Concrete Pavements PDF Download
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Author: W. J. Nowlen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 18
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Author: W. J. Nowlen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 18
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Author: Terry Dossey
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 148
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Book Description
Although recent studies have shown that pavement performance does vary by aggregate type, current portland cement concrete pavement design tools do not fully incorporate aggregate properties into the design process. Aggregate characteristics shown to affect pavement performance include strength, thermal properties, and shrinkage properties. The objective of this study was to investigate the material properties of crushed limestone and siliceous river gravel, two aggregates predominantly used in current pavement construction, and to determine a relationship between the properties of single-aggregate concrete and concrete made with predetermined blends of limestone and gravel. This report continues the work of Project 422/1244, which was limited to single-aggregate concretes. Additional models were developed to predict concrete properties of blended aggregate concrete for use in the design tools, CRCP and JRCP, described in previous 422/1244 reports. A computer program, CHEM2, was developed, which allows the pavement designer to estimate the material properties of concrete from an inexpensive chemical test.
Author:
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 80
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Book Description
ODOT is continually searching for ways to improve the cost efficiency of Portland cement concrete without sacrificing concrete strength and stiffness. Because Portland cement is easily the most costly material used in normal concrete, limiting the amount of cement used is the quickest way to achieve cost effectiveness. In addition, limiting the cement content will also help to prevent dimensional instabilities in concrete such as shrinkage and creep. The use of larger sized coarse aggregates may be useful in limiting cement content, yet larger sized coarse aggregates may also decrease concrete strength by weakening the aggregate-cement paste bond. In many transportation structures, such as pavements, concrete strength is not critical, as dimensional stability, porosity, and durability play a more important role. It is possible, therefore, that larger sized coarse aggregates can reduce the cement content and improve these properties. Laboratory research is needed to determine if larger sized coarse aggregates can improve cement efficiency without reducing concrete strength.
Author: Altamashuddin Khan Nadeemallah
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659354656
Category :
Languages : en
Pages : 60
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Book Description
Concrete is a composite construction material made primarily with aggregate, cement, and water. There are many formulations of concrete, which provide varied properties, and concrete is the most used man-made product in the world. Concrete is widely used for making architectural structures, foundations, brick/block walls, pavements, bridges, dams, pools/reservoirs, even boats etc. There is a general view that the size of coarse aggregate affects only the properties of fresh concrete and it is impact on hardened properties is insignificant. This book presents the impact of different sizes of coarse aggregate on fresh and hardened properties of concrete. While slump cone test evaluated the fresh concrete properties, compressive strength test determined the hardened state properties by using concrete mixtures that proportioned with three types of cements. Graded coarse aggregates with maximum aggregate size were selected for this experimental program for each cement. The results show that while the coarse aggregate size influences the slump, it is not relevant to compressive strength. The latter properties are governed by (w/b) ratio, cement type and cement content.
Author: B. E. Colley
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 18
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Author: A. R. Tarrer
Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 36
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Author: Torben C. Hansen
Publisher:
ISBN:
Category :
Languages : en
Pages : 12
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Author: Tyler Ley
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 47
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Book Description
For years, specifications have focused on the water to cement ratio (w/cm) and strength of concrete, despite the majority of the volume of a concrete mixture consisting of aggregate. An aggregate distribution of roughly 60% coarse aggregate and 40% fine aggregate, regardless of gradation and availability of aggregates, has been used as the norm for a concrete pavement mixture. Efforts to reduce the costs and improve sustainability of concrete mixtures have pushed owners to pay closer attention to mixtures with a well-graded aggregate particle distribution. In general, workability has many different variables that are independent of gradation, such as paste volume and viscosity, aggregate's shape, and texture. A better understanding of how the properties of aggregates affect the workability of concrete is needed. The effects of aggregate characteristics on concrete properties, such as ability to be vibrated, strength, and resistivity, were investigated using mixtures in which the paste content and the w/cm were held constant. The results showed the different aggregate proportions, the maximum nominal aggregate sizes, and combinations of different aggregates all had an impact on the performance in the strength, slump, and box test.
Author: Thomas Joseph McMahon
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 290
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Book Description
Author: Samuel Aroni
Publisher:
ISBN:
Category : Expansive concrete
Languages : en
Pages : 406
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Book Description
