Assessing Cryogenic Testing of Aggregates for Concrete Pavements PDF Download
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Author: Charles J. Korhonen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 24
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Book Description
Author: Charles J. Korhonen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 24
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
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Book Description
Damage to concrete pavements caused by freeze-thaw deterioration of concrete aggregate remains a serious problem. Current tests for determining an aggregate's freeze-thaw durability can take up to 70 days to perform and results from these tests don't always correlate well with field performance. A rapid test for freeze-thaw durability that would accurately predict field service would be a valuable tool for providing durable concrete. Cycling aggregate 10 times between liquid nitrogen and hot water proved useful as a tool to rule out frost-susceptible aggregate. Pore size distribution measurements reveal pore sizes that are critical to freeze-thaw durability. Aggregates with more than 75% of their measurable pore volume between pore diameters of 0.01 and 5 micrometers or with more than 95% of their measurable pore volume smaller than 5 micrometers were susceptible to frost damage. Thus a new freeze-thaw test for aggregates might employ the cryogenic test to screen out all frost- susceptible aggregate and pore size measurement classify the rest. This new test procedure offers results much sooner than current standard test procedures. Further study is needed to refine this method for general use. (MM).
Author:
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Category : Arctic regions
Languages : en
Pages : 24
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Author:
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Category : Government publications
Languages : en
Pages : 1388
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Author: Amir Naoum Hanna
Publisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 36
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Book Description
"This digest summarizes the findings from NCHRP Project 4-20C, 'Aggregate Tests Related to Performance of Portland cement concrete Pavements: State of the Knowledge.' It was prepared by Dr. Amir N. Hanna ... from the contractor's final report authored by Dr. Kevin J. Folliard and Mr. Kurt D. Smith ..."--Page 1
Author: Farhad Reza
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 195
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Book Description
The need to consider sustainability in design dictates that materials should be recycled and reused whenever possible. The Minnesota Department of Transportation (MnDOT) is quite progressive in allowing the use of recycled aggregates in new construction. While the use of recycled concrete aggregate (RCA) in the base course of new pavements is quite common in Minnesota and many other states, it is rarely used in the concrete pavement itself. In fact, Minnesota was one of the few states to build multiple trial projects and has one of the largest number of concrete pavements constructed using the RCA in the concrete itself. The performance of those pavements, most of which are still in service, has never been formally evaluated against similar conventional concrete pavements. This prompted the current research study. Additional objectives were to assess the current state of practice across the nation, conduct experimental investigations using RCA in concrete, assess the sustainability and in particular the economics of using RCA in concrete, and finally to provide some recommendations for guidelines on using RCA in concrete. It has been shown by the authors and other researchers that it is possible to create strong and durable concrete mixtures using RCA as coarse aggregate in volume replacement levels of natural coarse aggregate up to 100%.
Author: Shervin Jahangirnejad
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 330
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Author: Virginia Polytechnic Institute
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 40
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Book Description
Investigation was conducted to develop a simple and fast test that could be used to identify aggregates that cause poor concrete performance when frozen. A one-cycle slow- freeze test was developed and evaluated by correlating results with the durability factor obtained from astm method c290 (the standard freezing and thawing test in water). The test method and testing procedures are presented in detail.
Author:
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Category : Weights and measures
Languages : en
Pages : 1064
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Book Description
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 700
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
