Arti dan kegunaannya

ASTM D7735 Type A Hardness Tester for Thermoplastic Pavement Marking at High Temperatures The standard test method for hardness testing covers the Type A hardness tester for thermoplastic pavement marking materials at high temperatures.

5.1 This method is based on the penetration of a specific type of indenter when pressed into the material under specific conditions. Indentation hardness is inversely proportional to the penetration force and depends on the elastic modulus of the material, viscoelastic behavior, the geometry of the indenter, the force applied, and the temperature at the time of testing. The test method is empirical and is therefore primarily used for control purposes. There is no simple relationship between the indentation hardness determined by this test method and any fundamental properties of the material being tested.

ASTM D7735-2017 “Metode Uji Standar Pengujian Kekerasan dengan Durometer Tipe A untuk Marka Perkerasan Termoplastik pada Suhu Tinggi”

Melangkah 1: Cakupan

1.1 This test method covers the Type A durometer hardness of thermoplastic pavement marking materials at high temperatures.

1.2 This test method is similar in hardness to test method D2240, with special attention to keeping the temperature of the test sample and instrument constant. In the world of highway materials, it is sometimes referred to as “anti-indentation”.

1.3 All materials, instrumen, or equipment used to determine temperature, kekerasan, and time shall be traceable to the National Institute of Standards and Technology or other internationally recognized parallel organizations.

1.4 Nilai yang dinyatakan dalam satuan SI dianggap sebagai nilai standar. Nilai yang diberikan dalam tanda kurung hanya untuk referensi.

1.5 Standar ini tidak dimaksudkan untuk mengatasi semua masalah keselamatan (jika ada) terkait dengan penggunaannya. Pengguna standar ini bertanggung jawab untuk menetapkan praktik keselamatan dan kesehatan yang sesuai dan menentukan penerapan pembatasan peraturan sebelum digunakan..

1.6 Standar internasional ini didasarkan pada prinsip-prinsip standardisasi yang diakui secara internasional yang ditetapkan dalam “Keputusan tentang Prinsip Pengembangan Standar Internasional, Pedoman dan Rekomendasi” issued by the WTO Committee on Technical Barriers to Trade (TBT).