Methods for Determining Abrasion Resistant Of Concrete
There are different types of tests available for the determination of abrasive actions. Therefore, only a single test is not sufficient for simulating the whole type of field abrasive actions. The appropriateness is very important in these methods for different code procedures with respect the abrasion action.
There are different test methods to determine the abrasion resistance of concrete, subjected to a variety of abrasion. There are different tests used in different countries and it is apparent that there is no single method that sufficiently measures the abrasion resistance of concrete under all conditions.
Different types of abrasion tests which are listed below.
Currently, there are four standard test methods conducted at International level. A tabular guide should be used to illustrate the aptness of each process in different abrasive materials. Theses guides are very useful to the researchers in deciding the type of test required to simulate the field of abrasion conditions. The consistency of test methods for abrasion resistance of concrete surface can be used for various purposes. The methods used worldwide to evaluate the abrasion resistance of concrete, have attempted with varied success to imitate the typical forces harmful to concrete surfaces.
Testing Procedures and Methods:
A brief detail of these important methods are as follows:
Revolving disk machine: This machining method introduces frictional forces by grinding and rubbing. Scuffing and Sliding is accomplished by rotating steel disks in combination with abrasive gravel.
These methods are very adaptable and portable for laboratory and on site field abrasion testing.
Test Method for Abrasion Resistance of Concrete Underwater Method: This method is also used for abrasion resistance of concrete. It was developed by Liu in 1981 for measuring the abrasion action of any abrasion resistant material. It was also used to determine the accurate resistance of concrete subjected to water particles on hydraulic structures such as spillways, stilling basin etc.
The equipment contains basically an agitation paddle, a drill press, a cylindrical steel container and 60 steel grinding balls of different sizes.
The container filled with water is circulated by the captivation of agitation paddle that is motorized by drill press rotating at a speed of 1100 rpm. Circulating water container in turn, moves the abrasive charges on the surface on the concrete specimen, generating the abrasion effects. The standard test consists of six 10 hours test periods for a total of 60 hours.
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