2 edition of Seasonal variation of pavement strength based on Benkelman beam rebounds found in the catalog.
Seasonal variation of pavement strength based on Benkelman beam rebounds
by Canadian Strategic Highway Research Program, Transportation Association of Canada in Ottawa
Written in English
Includes bibliographical references.
|Statement||prepared for Canadian Strategic Highway Research Program (C-SHRP) as part of the Canadian Long-Term Pavement 2 Performance (C-LTPP) Project ; prepared by Martin Samson and Luc Fréchette.|
|Contributions||Fréchette, Luc., Canadian Strategic Highway Research Program.|
|LC Classifications||TE251.5 .S26 1995|
|The Physical Object|
|Pagination||1 v. (various pagings) :|
Resources Back to Resources. Benkelman beam deflection measurements Published: June | Category This test procedure covers the determination of the rebound deflection of a pavement under a standard wheel load and tyre pressure, with or without temperature measurements. Pavement and Performance; Benkelman Beam; Benkelman Beam. This is used to measure the deflection of a flexible pavement under moving wheel loads. In use, the probe is placed between the tires of a test vehicle, and deflection is measured as the vehicle passes over the test area to beyond the end of the probe beam. The reference beam is equipped.
department of highways in cooperation with u.s. department of commerce bureau of public roads and minnesota local road research board flexible pavement evaluation with the benkelman beam investigation no. summary report – ( revision). The Benkelman beam was developed at the WASHO Road Test for the purpose of measur ing the deflection of a flexible pavement under a loaded pneumatic tire. The beam fulfilled a need for a simple instrument that could quickly and conveniently measure the pavement sur face deflection at File Size: 1MB.
Figure 1: Diagram of Benkelman Beam Figure 2: Conceptual Working of Benkelman Beam Taking the Dial Gauge Reading The procedure of measuring the rebound deflection is as follows • Select 10 points along the outer wheel path (i.e., 60 cm from the pavement edge) for each lane. Accurate information about pavement strength is a critically important input for use in RMMS. Different types of tests such as the Benkelman Beam Test, Falling Weight Deflectometer and Dynamic Cone Penetrometer (DCP) test and the CBR test all provide useful information on pavement strength. It is obviously essential to select the right type of File Size: KB.
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Seasonal variation of pavement strength based on benkelman beam rebounds This C-SHRP data insight project was carried out in an effort to better understand and characterize the seasonal behaviour of roads located in areas subjected to seasonal by: 1.
Static Deflection Equipment. Static deflection equipment measure pavement deflection in response to a static load. Benkelman Beam. The Benkelman Beam (Figure 2), developed at the Western Association of State Highway Organizations (WASHO) Road Test inis.
Pavement deflection is measured by the Benkelman beam which consists of a slender beam m long pivoted at a distance of m from the tip (see fig.1). By suitably placing the probe between the dual wheels of a loaded truck, it is possible to measure the rebound and residual deflections of the pavement structure.
The Benkelman beam measures the deflection of a flexible pavement under moving wheel loads. Extremely accurate and easy to use.
Direct-reading dial indicator eliminates need for conversion tables or field calculations. This pavement analysis tool provides the following features: • Precision accuracy • Easy to use on test site. Samson and L. Fréchette, " Seasonal variation of pavement strength based on Benkelman Beam rebounds ", Canadian Strategic Highway Research Program (C-SHRP), TNZ T/1 June SP/STXXXX STANDARD TEST PROCEDURE FOR BENKELMAN BEAM DEFLECTION MEASUREMENTS Page 4 of 5 Pages (S - I) and (S - F) XT = 2(S - F) X(T) = 2(S - F) + (I - F) 20 - t X20 = XT + 4.
CALCULATIONS The rebound deflection of the pavement shall be calculated in the following manner:** (a) Two pavement rebound indicators shall be established by. Introduction NDT Benkelman Beam Deflection Measurement Calculation Correction Overlay Benkelmen Beam The Benkelman beam is the simplest and the oldest deﬂection test device, developed in the United States in the mids Simplicity in taking measurements.
lowest purchasing nt evaluation and measurement of functional and structural. The entire length of m of Runway for Surat Airport is grouped in five sections as per pavement condition, and each section of Runway have been classified relatively as Good, Fair and Poor based on visual observation and performance study, and Benkelman Beam Deflection measurements.
This paper discusses a method of flexible pavement design based on Benkelman Beam Rebound (BBR) measurements. The procedure is applicable to the design of an overlay for an existing pavement, while in the design of a new pavement an existing pavement is used as a prototype for evaluation of strength and establishment of the thicknesses for the Author: E B Wilkins, G D Campbell.
based on this rating. The overall pavement condition is also determined. The characteristic deflection of the pavement is determined by using Benkelman Beam Deflection testing technique and overlay thickness required for the pavement to withstand present as well as future traffic loading is calculated as per IRC: 81 – guidelines.
Size: KB. • This test procedure covers the determination of the rebound deflection of a pavement under a standard wheel load and tyre pressure.
Deflected Pavement Structure Bounce Back To Original Shape Deflected Surface Original Position L O A D L O A D Load removed 1. Benkelman beam – • Consist of slender beam of length m. BARAN, ANGELL, EARL, WALSH - BENKELMAN BEAM DEFLECTION BOWLS DESCRIPTION OF BENKELMAN BEAM BOWLS The Benkelman beam consists basically of a m long beam pivoted at a point m from the tip.
(Refer Fig 1.) The pivot is held in place by an external frame supported by a pair of fixed legs, near the pivot point and an. Benkelman Beam Test OBJECTIVE: To determine the rebound deflection of a pavement under a standard wheel load and tyre pressure with or without temperature measurement by Benkelman Beam test.
INTRODUCTION A.C. Benkelman devised the simple deflection beam in for measurement of pavement surface deflection on the WASHTO Test Road. It is widely used all over. The data acquisition calibration factor of a Benkelman Beam is determined by applying known deflections to the beam tip and comparing each calibration jig dial gauge reading to the deflection calculated by the deflection test computer program BWL4.
Apparatus Benkelman beam calibrating jig with calibrated dial gauge (Figure 2).File Size: KB. test method for determination of elastic modulus of pavement structure using Benkelman beam, with each country have standard about it.ở việt nam các bạn có t.
was to evaluate the effect of seasonal environmental variations on pavement stiffness and strength. More specifically, the objectives were to 1.
Measure changes in subgrade resilient modulus with changes in season and 2. Develop an algorithm to predict seasonal change in. Figure 6: Examples of a beam (top) and a beam (bottom) The equipment required for Benkelman Beam testing is; • A Benkelman beam that meets the minimum requirements of T • A truck with a single rear axle and dual back wheels.
T details the type of tyre and the. The HM Benkelman Beam is a simple lever-arm device which measures deflection of flexible pavements under the action of moving wheel loads.
The probe beam, supported by a rigid reference beam, measures deflections using its m (8ft) probe end and a dial indicator at the end of the fulcrum. Strengthening of Flexible Pavements using Benkelman Beam Deflection Technique. As per IRC By Prof.
Bodas Pavement Overlay-1 A distressed pavement requires maintenance. Its expenditure can be optimized by proper planning,construction & quality control.5/5(1). Benkelman Beam. Measures the deflection of a flexible pavement under moving wheel loads. HHA Digital Indicator, Horizontal.
Horizontal-reading, digital gauge for use with the Benkelman Beam. HXX Dial Indicator, Vertical. Vertical dial indicator for the Benkelman Beam. The Benkelman Beam measures the static deflections and it is operated on the basis of lever arm principle.
Measurement is made by placing the tip of the beam between the dual tires and measuring the pavement surface rebound as the truck is moved away.
The test is of low cost but it is time consuming and labour intensive in carrying out the test.loads. Advantages of the Benkelman Beam include ease to use, low equipment cost, and large database can be created about performance of the pavement over the years.
But, the guidelines given by IRC: for conducting Benkelman Beam Test are applicable only for flexible pavements. In this study attempt has been made toFile Size: 1MB.A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text.