This test method, which is a modification of aashto designation t 96, is used to determine the resistance of coarse aggregate to impact in a rotating cylinder containing metallic spheres. Since its formation to the final use in construction, the aggregate may undergo a significance change in its shape,its color,toughness and hardness. Others are based on the projection of abrasive particles on to the test. There are testing methods are related to the abrasion by friction concept. There are 3 tests commonly used to test aggregates for its abrasion resistance. Up to twelve balls are used, depending on gradation of test sample. After the prescribed number of revolutions, discharge the.
Infrastructure development projects in oman are at a peak which results in a huge requirement for the construction materials. The machine shall be so driven and so counter balanced as to maintain a substantially uniform peripheral speed. It measures the degradation of standard gradings of aggregates when subjected to abrasion and impact in a rotating steel drum with an abrasive charge of steel balls. The steel balls are required to be approximately 1 2732 in. Astm c535 16 standard test method for resistance to. In this blog post, well discuss why this type of test matters, redefine. Briefly, this test requires the aggregate to be placed in a metal drum along with a charge of steel balls, and the drum rotated 500 times. This test method which is a modification of aashto designation t 96, is used to determine the resistance of coarse aggregate to impact in a rotating cylinder containing metallic spheres. Test measures degradation of standard gradings of aggregates when subjected to abrasion and impact, in a rotating steel drum containing an abrasive charge of steel balls. One important criterion for assessing this feature is abrasion resistance.
To understand the test to the result of test, two types of rocks, i. Virginia transportation research council research report. C6 test method for sieve analysis of fine and coarse aggregates. It can be intentionally imposed in a controlled process using an abrasive.
To determine the abrasion value of coarse aggregates as per is. Abrasion is the process of scuffing, scratching, wearing down, marring, or rubbing away. C6c6m test method for sieve analysis of fine and coarse aggregates. After the prescribed number of revolutions, discharge the material from the machine and make a preliminary separation of the sample on a sieve coarser than the 1. The machine shall be rotated for 100 revolutions for all gradings. The friction between the vehicles moving tyre and the road surface results in the tear or abrasion of aggregates. Measure of resistance of coarse aggregate to degradation breakdown by. Pdf abrasion degradation of aggregates find, read and cite all the research. The percentage is a measure of the degradation or loss of material as a result of impact and abrasive actions. Aggregate abrasion characteristics are important because the constituent aggregate in hma must resist crushing, degradation and disintegration in order to produce a high quality hma.
Place the test specimen in the drum and secure the cover. If you continue browsing the site, you agree to the use of cookies on this website. Depending on the nature and purpose of the product, various testing methods are available. However, some state highway departments have had to develop tests of their own for determining wearability of aggregates under wet abrasion conditions. Test should be performed at room temperature to avoid humidity causing errors. Pdf standard test method for resistance to degradation. Aggregate mechanical properties malzeme test makinalar. Abrasion requirements do not apply to blast furnace slag. Abrasion test is widely used as an indicator of the relative quality of aggregates. Abrasion test test to determine the abrasion value. At the completion of the test, the material should be discharged and. Natural aggregates undergo a lot of physical change in its entire life. For gradings a, b, c and d, the machine shall be rotated for 500 revolutions. Abrasion can be an undesirable effect of exposure to normal use or exposure to the elements.
Abrasion test is the measure of aggregate toughness and abrasion resistance such as crushing, degradation and disintegration. Rotate the machine at a range of speed from 30 to 33 rpm. To ascertain the degradation of aggregates by abrasion and impact. C670 practice for preparing precision and bias statements for test methods for construction materials. Methods of test for aggregates for concrete, part 4. Method of test for abrasion of lightweight course aggregate i. Only two states have a degradation requirement from some other type tests. The machine shall be rotated for 100 revolutions for all. Astm c1 c1m 20 standard test method for resistance.
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