In which situations is Type IV Portland cement (PC) used and why?
What will be an ideal response?
When water is added to PC, the reaction between them produces heat. If the heat is not dissipated, it damages the concrete. Type IV is a low-heat of hydration PC, i.e., its reaction with water produces less heat than Type I PC. Therefore, Type IV PC is used in mass concrete?components of large cross sections in which the heat dissipation is slow, such as dam walls and bridge columns.
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In the AWS specification for stainless steel-covered arc electrodes, following the prefix, the three-digit AISI stainless steel number is used to indicate ____.
A. the minimum tensile strength of the deposited metal B. usability and performance capabilities C. a flux cored electrode D. the type of stainless steel in the filler metal
____________________ are tough, fibrous material that attach bone to bone.
Fill in the blank(s) with the appropriate word(s).
Of the various types of tungsten electrodes available, the tungsten electrodes that are used for AC welding are
_____. a. lanthanated b. pure c. irradiated d. thoriated
Canola is now being used on a limited basis as a lubricant and has been used to make:
a. Plastic c. Clothing b. Synthetic rubber d. Synthetic wood