Describe the effect of water/powder ratio, mixing variables, temperature, drying, retarders, and accelerators on the strength, setting time, and setting expansion of gypsum products.
The water/powder ratio affects the setting time, thicker sets faster, thinner is weaker, and thick results in more expansion. A higher temperature usually causes it to set faster. Longer mixing results in a faster set frim more nucleui, more expansion. Accelerators decrease the setting time, while reatders including setting time, both reduce expansion.