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:
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 24
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Book Description
Author: Prithvi S. Kandhal
Publisher: Transportation Research Board
ISBN: 9780309062596
Category : Technology & Engineering
Languages : en
Pages : 116
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Book Description
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: Alaa Gabr
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages :
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Author: D. H. Jung
Publisher: National Research Council
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 124
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Book Description
This report describes the thermal stress restrained specimen test (TSRST), which was selected to evaluate the low-temperature cracking resistance of asphalt concrete mixtures. The TSRST system includes a load frame, step-motor-driven load ram, data acquisition hardware and software, temperature controller, and specimen alignment stand. An experiment design that considered a range of mixture and test condition variables was developed to evaluate the suitability of TSRST for characterizing low-temperature cracking resistance of asphalt concrete mixtures. Four asphalts and two aggregates were selected for the experiment. The mixture variables included asphalt type, aggregate type, and air voids content; the test condition variables included specimen size, stress relaxation, aging, and cooling rate.
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:
Publisher:
ISBN:
Category : Weights and measures
Languages : en
Pages : 1064
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