Determining rock abrasivity in the laboratory.
Main use for the Cerchar Abrasivity Index (CAI) is the determination and classification of hard rock abrasiveness. Estimation of tool wear is a possible consequent application. The Cerchar Abrasivity Test is one of the most used laboratory.
Cerchar test. The test involves use of a 90-degree cone pin on a sample that is placed on a lace. The rotation of the lace allows for control of the length of the scratch, whereas the arrangement of. the tool allows for varying the amount of load placed on the tip.
Table 2 provides a classification of the Cerchar, and compares it with a newly proposed abrasivity index: the Schimazek F-value. Ooids from beach sand in the Bahamas. Oolitic limestone of the Miami Formation. Freshwater limestone of the Fort Thompson in Miami, may have strength that.
Cerchar abrasivity index (CAI) value is used as an input parameter for cutting operation performance of the building stones especially for the selection of the cutting materials. CAI is also one of the commonly used tests to evaluate rock abrasiveness. Mainly two strength properties play an important role for abrasiveness of the rock.
OCAI-70 Original Cerchar abrasivity index tester ASTM D7625-10. Description. The OCAI-70 accurately determines the rock abrasivity index (CAI) employed for the classification of rock materials in terms of abrasivity. The CAI is a dimensionless unit obtained from measuring the wear on a HRC55 Rockwell Hardness steel stylus tip after it has been.
The Cerchar Abrasion Index (CAI) test is one of the simplest and most widely used methods for evaluating rock abrasivity. In this study, a new device for the determination of frictional forces and depth of pin penetration into the rock surface during a Cerchar test is discussed.
The abrasivity of rock and soil is a commonly determined property, which is used for the estimation of the wear of excavation tools. Therefore, d ifferent laboratory test have been developed over the last decades. Within this work, the often used LCPC - and Cerchar -test are presented. The.
The Cerchar test method and its index, the so-called Cerchar abrasivity index, are most commonly used to determine the abrasivity of rocks and other geo-materials for construction. Recently, with.
There have been developed a number of methods to assess the abrasivity of rock materials with the increased use of mechanized rock excavation. These methods range from determination of abrasive and hard mineral content using petrographic thin section analysis to weight loss or development of wear flat on a specified cutting tool. The Cerchar abrasivity index (CAI) test has been widely accepted.
The sample should be sufficient to permit 5 test scratches (10 mm) at least 5 mm from the edge of the rock surface and each test should be 5 mm apart. If it is a core, the diameter should be less than 76 mm and length less than 150 mm. Ideally size is like a tennis ball.
The abrasivity of rock and soil is a commonly determined property, which is used for the estimation of the wear of excavation tools. Therefore, different laboratory test have been developed over.
Effects of rock water content on CERCHAR Abrasivity Index M.Z. Abu Bakara,n, Y. Majeedb, J. Rostamic a Geological Engineering Department, University of Engineering and Technology, Lahore, Pakistan b Mining Engineering Department, University of Engineering and Technology, Lahore, Pakistan c Department of Mining Engineering, Colorado School of Mines, Golden, CO, USA.
Cerchar Hardness Index (sec) Figure 2. The relationship between uniaxial compressive strength and Cerchar hardness index (Bilgin et al. 1992). In addition, for coal samples, they formed a cuttability classification by using CHI values that is given in Table 1 (Bilgin et al. 1992). Table 1. A cuttability classification for Cerchar hardness.
