INDEX Bench testing

The work of Forbes and Battersby [46] is an integrated study of the relations among the chemical structures of the dialkyl phosphites, their adsorption on and reaction with iron, and their behavior in four-ball bench testing of lubricant additive effectiveness. The four-ball data in Table 11-17 for solutions of additive in white oil show that both the wear/load index (mean Hertz load) and the initial seizure load are critically responsive to concentration, with a strong effect when the concentration increases from 0.01 to 0.04 molal (0.031% to 0.124% P). The initial seizure load is an uncomplicated criterion with a straightforward interpretation, whereas the wear/load index is contrived, both in concept and performance. The low-load 50 minute wear data show inconsistencies in the influence of additives that have not been explained. 

The NTPEP program has included both index tests and bench-scale indexed performance tests. The goal of the program is to minimize duplicative testing of ECPs done by individual State Departments of Transportation (DOTs) by providing a process by... 

Procedures should be organized and indexed in the form of manuals and must be written in compliance with National Committee for Clinical Laboratory Standards (NCCLS) GP2-A2 (3). Technical procedures designed for use at the bench should be complete, easy to follow, and readily available to testing personnel. These procedures must contain the following information for each assay performed ... 

Because both ECPs and SRDs are systems intended to control erosion or retain sediment, their respective performance in the field cannot be fully determined using only the material properties or index tests mentioned previously. Thus, bench-scale tests are used to test the ECP—soil system or SRD—water system under carefully controlled standard soil—hydraulic conditions that may or may not simulate field conditions. The reduced scale of the testing facilitates lower cost and quicker testing than with full-scale performance tests. Bench-scale tests are indicators of system performance but do not take into account the effects of product installation upon performance. Therefore, the results of these tests may not indicate an ECP s or SRD s actual field performance. 

Slope erosion and runoff reduction ASTM D7101, Standard Index Test Method for Determination of Unvegetated RoUed Erosion Control Product Ability to Protect Soil from Rain Splash and Associated Runoff Under Bench-Scale Conditions ... 

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