Field Tests and Analyses of High Density Polyethylene Pipes for Highway Application PDF Download
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Author: Kam Weng Ng
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Book Description
The findings from the field tests in Phase I and this phase will provide data for improvement of Iowa DOT specifications for HDPE pipe and its backfill condition. Field studies of Phase I conducted on 36-in. (915-mm) diameter HDPE pipes from Manufacturer C with four backfills were used for an assessment of the influence of the soil envelope on pipes' performance in this thesis. Furthermore, full scale field tests were conducted in this phase on 36-in. (915-mm) pipe from Manufacturer A with four additional backfill materials. The testing program used in this phase is similar to Phase I.
Author: Kam Weng Ng
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Book Description
The findings from the field tests in Phase I and this phase will provide data for improvement of Iowa DOT specifications for HDPE pipe and its backfill condition. Field studies of Phase I conducted on 36-in. (915-mm) diameter HDPE pipes from Manufacturer C with four backfills were used for an assessment of the influence of the soil envelope on pipes' performance in this thesis. Furthermore, full scale field tests were conducted in this phase on 36-in. (915-mm) pipe from Manufacturer A with four additional backfill materials. The testing program used in this phase is similar to Phase I.
Author: Brett Eric Conard
Publisher:
ISBN:
Category :
Languages : en
Pages : 192
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Book Description
This knowledge base will allow the IDOT to revise current specifications for the use of high density polyethylene pipe for shallow fill conditions. Testing included laboratory tests to evaluate polyethylene pipe response at elevated temperatures and field tests on polyethylene pipes to determine the response of various soilstructure systems to surface live loads.
Author: Robert A. Lohnes
Publisher:
ISBN:
Category : Culverts
Languages : en
Pages : 82
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Book Description
It is generally accepted that high density polyethylene pipe (HDPE) performs well under live loads with shallow cover, provided the backfill is well compacted. Although industry standards require carefully compacted backfill, poor inspection and/or faulty construction may result in soils that provide inadequate restraint at the springlines of the pipes thereby causing failure. The objectives of this study were: 1) to experimentally define a lower limit of compaction under which the pipes perform satisfactorily, 2) to quantify the increase in soil support as compaction effort increases, 3) to evaluate pipe response for loads applied near the ends of the buried pipes, 4) to determine minimum depths of cover for a variety of pipes and soil conditions by analytically expanding the experimental results through the use of the finite element program CANDE.
Author:
Publisher:
ISBN:
Category : Culverts
Languages : en
Pages : 198
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Book Description
In the past, culvert pipes were made only of corrugated metal or reinforced concrete. In recent years, several manufacturers have made pipe of lightweight plastic - for example, high density polyethylene (HDPE) - which is considered to be viscoelastic in its structural behavior. It appears that there are several highway applications in which HDPE pipe would be an economically favorable alternative. However, the newness of plastic pipe requires the evaluation of its performance, integrity, and durability; A review of the Iowa Department of Transportation Standard Specifications for Highway and Bridge Construction reveals limited information on the use of plastic pipe for state projects. The objective of this study was to review and evaluate the use of HDPE pipe in roadway applications. Structural performance, soil-structure interaction, and the sensitivity of the pipe to installation was investigated. Comprehensive computerized literature searches were undertaken to define the state of-the-art in the design and use of HDPE pipe in highway applications. A questionnaire was developed and sent to all Iowa county engineers to learn of their use of HDPE pipe. Responses indicated that the majority of county engineers were aware of the product but were not confident in its ability to perform as well as conventional materials. Counties currently using HDPE pipe in general only use it in driveway crossings. Originally, we intended to survey states as to their usage of HDPE pipe. However, a few weeks after initiation of the project, it was learned that the Tennessee DOT was in the process of making a similar survey of state DOT's. Results of the Tennessee survey of states have been obtained and included in this report. In an effort to develop more confidence in the pipe's performance parameters, this research included laboratory tests to determine the ring and flexural stiffness of HDPE pipe provided by various manufacturers. Parallel plate tests verified all specimens were in compliance with ASTM specifications. Flexural testing revealed that pipe profile had a significant effect on the longitudinal stiffness and that strength could not be accurately predicted on the basis of diameter alone. Realizing that the soil around a buried HDPE pipe contributes to the pipe stiffness, the research team completed a limited series of tests on buried 3 ft-diameter HDPE pipe. The tests simulated the effects of truck wheel loads above the pipe and were conducted with two feet of cover. These tests indicated that the type and quality of backfill significantly influences the performance of HDPE pipe. The tests revealed that the soil envelope does significantly affect the performance of HDPE pipe in situ, and after a certain point, no additional strength is realized by increasing the quality of the backfill.
Author: Yick Grace Hsuan
Publisher: Transportation Research Board
ISBN: 9780309066075
Category : Science
Languages : en
Pages : 60
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Author:
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 262
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Author: Jie Han
Publisher:
ISBN:
Category : Drainage pipes
Languages : en
Pages : 210
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Book Description
Two field tests were conducted to investigate the field performance of steel-reinforced high-density polyethylene (SRHDPE) pipes during installation and under traffic loading. One test site was located on E 1000 road in Lawrence, KS, which is close to Clinton Lake. Three SRHDPE pipes with a diameter of 3 ft and a length of 24 ft were buried in a 6 ft wide trench with 2 ft thick soil cover. This test site had two test sections: one section was filled with Aggregate Base Class 3 aggregate (AB3) and the second section was filled with crushed stone. The second field study was conducted at a Kansas Department of Transportation (KDOT) storage yard in Kansas City, KS. Four 6 ft long SRHDPE pipes with a diameter of 2 ft were connected and buried in a trench with a dimension of 4.6 ft wide × 27.5 ft long × 4.2 ft deep. Two types of backfill material were also used in the trench, namely, AB3 aggregate and crushed stone. Earth pressures, pipe deflections, and pipe strains on plastic valley, plastic cover, and steel ribs were monitored during pipe installation and under static loading on both test sites. The test results from the pipe installation and static loading showed that (1) the vertical arching factor (VAF) on the top of the pipe was approximately 1.1 and the lateral earth pressure coefficient was approximately 0.65; (2) the peaking deflection was observed in both field tests in a range of 0.25 to 1.80% (the peaking deflection in the AB3 section was greater than that in the crushed stone section); (3) the maximum strain of the pipe occurred on the plastic valley in the longitudinal direction at the pipe crown, which was in a range of 0.4-0.6% and much lower than the strain limit of 5% suggested by the American Association of State Highway and Transportation Officials (AASHTO, 2012); and (4) the Giroud and Han (2004) method and the AASHTO (2012) method could reasonably estimate the earth pressure on the pipe under static loading, while the Iowa Formula could estimate the pipe deflection during installation and caused by static loading. The earth pressures, the pipe deflections, and the strains of the pipes in the Lawrence site were monitored for 680 days and all increased with time. Two empirical correlations were proposed to calculate the VAF and the pipe stiffness factor at a given time. The AASHTO (2012) design methods for metal pipes and high-density polyethylene (HDPE) pipes were modified for SRHDPE pipes based on the laboratory and field test results. A design procedure for SRHDPE pipes is proposed and illustrated by a design example.
Author: Sujit Kumar Dash
Publisher: Frontiers Media SA
ISBN: 2889667413
Category : Technology & Engineering
Languages : en
Pages : 107
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Author: Brent Matthew Phares
Publisher:
ISBN:
Category :
Languages : en
Pages : 464
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Author:
Publisher:
ISBN:
Category : Roads
Languages : en
Pages : 786
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