Figure 13-37.-Marshall stability testing head mounted in CBRjack.however, we’ll briefly discuss the method here. Theapparatus used for testing stability and flow of thespecimen is shown in figure 13-37. This figure shows aMarshall stability testing head containing the specimen,mounted on the plunger of a bearing-ratio jack. This testhead consists of upper and lower breaking heads. A5,000-pound proving ring with a dial is installed in thejack.The test for stability is made by applying pressuregradually, about 2 inches per minute, and reading themaximum pressure the specimen sustains before failing.The test for flow is carried out simultaneously byholding a flow meter over the testing head guide rod(vertical rod shown running through the testing heads)and reading the meter at the instant the specimen failsunder pressure. This reading indicates the flow value ofthe specimen in inches to the nearest 0.01 inch.HAZARDOUS-MATERIALPRECAUTIONSAlthough the Navy has exacting definitions for theterms hazardous material, hazardous chemical, andhazardous substance, let’s, for simplicity of discussion,lump them all together and simply say that thesematerials, because of their quantities, concentration, orhazardous properties, pose a substantial hazard tohuman safety and health or to the environment. The risksassociated with these materials include flammability,toxicity, corrosivity, and reactivity. From your study ofthis chapter and the EA3 TRAMAN, you should be ableto see readily how many of the materials you test, or usefor testing, in the laboratory fall within the abovedefinition. Heated asphalt can cause severe burns ifallowed to come into contact with the skin, and asphaltcutbacks are highly flammable with low flash points.Some of the chemicals that you will use in materialstesting are highly toxic and corrosive. Others react withwater, forming explosive gases; however, not all of thehazardous materials that an EA uses are confined to thelaboratory. For example, the ammonia used withreproduction equipment gives off highly toxic fumes.For these and other reasons, all such materials must behandled, used, stored, and disposed of properly and withcaution. As a crew leader, you must recognize the threatthat hazardous materials pose to all personnel presenton the jobsite and take action to prevent mishaps.Material Safety Data Sheets (MSDS) must bereceived and maintained for all hazardous materials inyour work space. The MSDS identifies any hazardsassociated with exposure to a specific material. Itidentifies personal protective equipment and othersafety precautions required as well as first aid or medicaltreatment required for exposure. By federal law, a crewleader is required to inform his or her crew members ofthe risks and all safety precautions associated with anyhazardous material present on the jobsite. A good timefor you to do this is during your daily standup safetylectures.A safe practice concerning hazardous materials is tonot draw more material than will be used in 1 day.Storing hazardous materials in the workspace or on thejobsite requires the use of approved storage containers.Some of these materials require separate storage; forexample, flammable materials and corrosive materialscannot be stored together. When in doubt about storagerequirements, consult with your supervisor or the safetyofficer.Excess hazardous materials or hazardous wasteproducts must be disposed of through an authorized13-50
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