Highway Concrete Pavement Technology Development and Testing PDF Download

Author:
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Category : Alkali-aggregate reactions
Languages : en
Pages :

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Author: Paul D. Krauss
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Category : Alkali-aggregate reactions
Languages : en
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Author:
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ISBN:
Category : Alkali-aggregate reactions
Languages : en
Pages :

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Book Description

Author:
Publisher:
ISBN:
Category : Alkali-aggregate reactions
Languages : en
Pages :

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Book Description

Author:
Publisher:
ISBN:
Category : Alkali-aggregate reactions
Languages : en
Pages :

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Book Description

Author:
Publisher:
ISBN:
Category : Alkali-aggregate reactions
Languages : en
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Author: Stephen R. Boyd
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Category : Concrete bridges
Languages : en
Pages : 70

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Author: H. Thomas Yu
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Category : High strength concrete
Languages : en
Pages : 51

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The objective of this study was to monitor and evaluate the performance of experimental full-depth repairs made with high early-strength (HES) materials placed under Strategic Highway Research Program (SHRP) project C-206, Optimization of Highway Concrete Technology. The C-206 full-depth repair experiment was conducted to demonstrate and validate the technologies that allow early opening of full-depth portland cement concrete (PCC) pavement repairs to traffic and to document the information needed to apply this technology. The experimental factors for the full-depth repair experiment included material type, strength at opening, and repair length. A total of 11 different HES concrete mixes with opening times ranging from 2 to 24 hours were evaluated at 2 field sites (US. 1-20, Augusta, GA and State Route 2, Vermilion, OH). The scope of this study included 5-year monitoring of SHRP C-206 full-depth experiment sections, analyzing the data, and revising the guidelines for early opening of full-depth PCC pavement repairs as needed. The monitoring program consisted of annual visual distress surveys to monitor the development of cracking, faulting, and spalling. The annual surveys were conducted from the fall of 1994 through the fall of 1998. The results of this evaluation showed that full-depth repairs made wit1 HES PCC can provide good long-term performance; however, adverse temperature conditions during installation can cause premature failures. Extremely high PCC temperatures during curing should also be avoided. The fatigue damage due to early opening is negligible, especially for repairs of 3.7 m or shorter. Within the range of strength evaluated under SHRP C-206, the strength at opening could not be correlated to performance. Based on the results of this evaluation, no changes are recommended to the opening criteria suggested in the SHRP C-206 manual of practice.

Author: Donald J. Janssen
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Category : Pavements, Concrete
Languages : en
Pages : 47

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Field test sections were constructed during 1992 as part of the Strategic Highway Research Program (SHRP) investigation of the frost resistance of concrete The first freeze-thaw-related deterioration expected for pavement concrete exposed to de-icing salt would be salt scaling Unfortunately, the test sections constructed In Ohio were diamond-ground between construction and the first visit of the monitoring team. The diamond ground surface did not deteriorate over time. Internal deterioration of the Ohio test sections was either not detected or was believed to be caused by a mechanism other than freeze-thaw. Freeze-thaw deterioration was not noticed, either, In the Minnesota test sections (not exposed to deicing salts), though freeze-thaw tests conducted on specimens cut from the test sections 6 years after construction showed significantly different performance than specimens prepared and tested at the time of test section construction. For both the Ohio and Minnesota test sections, only 6 years of winter exposure would not be adequate to evaluate potential long-term performance thoroughly Though the Ohio sections have been overlaid, making further monitoring impossible, the Minnesota sections are still exposed. Additional monitoring of these sections IS recommended, along with providing salt exposure to the sections to determine thaw resistance to salt scaling. The D-cracking mitigation study indicated that in many cases the D-cracking returned after 6 years, independent of the mitigation technique tried Additional testing would be required to make further evaluations.

Author: Jagannath Mallela
Publisher:
ISBN:
Category : High strength concrete
Languages : en
Pages : 69

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Book Description
This research study, sponsored by the Federal Highway Administration, summarizes the field performance of eight high-early-strength (HES) concrete patches between 1994 and 1998. The patches were constructed under the Strategic Highway Research Program (SHRP) between June 1991 and July 1992 and were located in 5 States (Arkansas, Illinois, Nebraska, New York, and North Carolina) using existing State construction practices. The patches were constructed mainly with Type 111 cement, four different types of coarse aggregate, and three different types of fine aggregate. Similar types of air entraining admixtures, water reducers, and set accelerators were used at all except the North Carolina site. The patches were located in areas with varying environmental and traffic conditions. The performance criterion of interest was durability. Durability of he HES concrete was quantified over a period of 7 years using various indicators including compressive strength, static elastic modulus, rapid chloride permeability, and asphalt concrete (AC) impedance. The HES patches were also examined visually to locate any material- or durability-related distresses. This report discusses in detail the effects of climate and material properties on the HES concrete durability. Some of the results of interest include the effect of water reducer type, curing method, and aggregate type on long-term durability. The report also presents comparisons of the rapid chloride permeability and AC impedance test results and the rate of strength gain for the mixes evaluated. Overall, the HES patches performed well with no obvious signs of deterioration. However, the results were not conclusive because the performance monitoring period was relatively short. There is a need for further research in the areas of long-term HES concrete mechanical properties and durability.