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ASTM E2835-21
Standard Test Method for Measuring Deflections Using a Portable Impulse Plate Load Test Device
Přeložit název
NORMA vydána dne 1.5.2021
Informace o normě:
Označení normy: ASTM E2835-21
Datum vydání normy: 1.5.2021
Kód zboží: NS-1024073
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM E2835-21 :
Keywords:
deflection surveys, deflection test methods, deflection testing, dynamic plate load testing (DPLT), impulse deflection testing device, light drop weight tester (LDWT), light weight deflectometer (LWD), load-deflection testing, nondestructive testing (NDT), pavement deflection, pavement foundation layers, pavement layer modulus, pavement layer stiffness, portable falling weight deflectometer (PFWD), portable impulse plate load test, quality assurance,
Doplňující informace
| Significance and Use | ||||
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4.1?This test method covers the determination of plate deflection resulting from the application of an impulse load. The deflection is measured at the center of the top of the load plate (see Note 1). Note 1:?If the load plate is in perfectly uniform contact with
the unbound material under the plate, then deflection of the load
plate should be equal to the deflection of the surface of the
unbound material under test. However, with typical unbound
materials a 100 % uniform contact can seldom be achieved.
Accordingly, the test surface shall be as clean and smooth as
possible with loose granules and protruding material removed. For
gravel surfaces, it is recommended that a thin layer of fine sand
be placed over the test point. For fine-grained materials, this
will help in obtaining a reasonably uniform contact between the
load plate and the surface. See 5.1 in Test Method D1195/D1195M.
4.2?Deflections may be either correlated directly to pavement performance or used to determine in-situ material characteristics of the pavement foundation layers. Some uses of the data include quality control and quality assurance of compacted layers, and for structural evaluation of load carrying capacity (see Note 2 and Guide D4695). Note 2:?The volume of the pavement foundation materials
affected by the applied load is a function of the magnitude of the
load, plate size and rigidity, loading rate, buffer stiffness, and
the stiffness and shear strength of the pavement foundation
materials. Therefore, care must be taken when analyzing the results
because the data obtained by the Portable Impulse Plate Load Test
may be obtained under substantially different conditions than when
a heavy moving wheel load passes over the pavement surface after
construction is complete.
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| 1. Scope | ||||
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1.1?This test method applies to measuring plate deflections using a Portable Impulse Plate Load Test device. The method covers the measurement of deflection of the load plate rather than the deflection of the surface of the pavement or foundation layers (see Note 1). 1.2?The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||
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