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Test results indicate that salt has a significant effect on the low temperature performance of asphalt binders; Freezeâthaw is a main influencing factor when the percentage of salt is less than 3%, and the erosion effect of salt accelerates the failure of asphalt mixtures when the percentage of salt is more than 3%.
The use of thisvalve and test method provides a relativemeasure of the tendency of propane typeliquefied petroleum gases containingmoisture to freeze in pressure reducingregulators which may interrupt the normalflow of gas.The test method is applica-ble to all propane type LP gases whereantifreeze is not present.FUNCTIONAL DESCRIPTION The freeze valve has two operatingpositions, a full flow position for chillingand/or purging and a restricted flow posi-tion for testing.he out-let of the valve has internal threads toassist the operator in determining whenthe flow has been interrupted or shut offas a result of ice having formed in theaperture of the valve. The instant the LPgas stops flowing over the threads, afrost line rolls over the lip of the valveoutlet.