Break
Break turns up in 3 fields: paper optics, concrete, asphalt. Here is what it means to the people in each one.
Break in paper optics
Tear of the running paper web on the machine, which sends everything to broke until the sheet is rethreaded.
A sheet break stops production while the crew clears paper and threads a tail back through the dryers and calender. Breaks come from holes, weak spots, wet streaks, draws set too tight or debris in the sheet. Each one costs production and floods the broke system, which then shifts shade and fluorescence on the reels that follow.
"Three breaks in the dryers tonight, all on the tending side, so check for a wet streak there."
Break in concrete
A cylinder strength test result, or the crushing of cylinders in the lab.
Engineers, supers and testing techs talk in breaks: 7-day breaks, 28-day breaks, the hold, a low break. Seven-day results usually land around 65 to 75 percent of the 28-day strength for a straight cement mix and lower for heavy SCM blends, so a weak 7-day number is an early warning. A low 28-day break sets off cores, extra holds and arguments about who added water.
"Seven-day breaks came in at 2,600 on a 4,000 mix, call the plant and ask what changed."
Break in asphalt
The point when an emulsion's water separates and the asphalt droplets fuse, turning the film from brown to black.
When an asphalt emulsion is sprayed onto a surface, its droplets start to coalesce as water evaporates or the emulsifier reacts with the aggregate, and that change is the break. The color shift from chocolate brown to black is the field signal. After the break the residue still has to set and cure as the last water leaves, which takes anywhere from minutes to hours depending on emulsion grade, temperature, humidity and wind.
"Hold the trucks, that tack's still brown, give it a few more minutes to break or they'll track it up the whole lane."