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Concrete Plant Tour in Boston, Massachusetts
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" Tell me where the raw material come from how do you get it here well a we get our raw material from a number of sources. Our sand material comes from Austin New Hampshire and arrives by ride by rail our aggregate is trucked in locally. And the cement. comes by barge from New York to a location in Charlestown and. is trucked over here and that of course will be Portland cement as Portland cement coming down here OK now how does the process start when you mix it. Orders come in to central control That's where I the customers well will us how much. I want it at what. What -- specs strength that's right that's right. The fellows there. It They take the orders and schedule them for the that's kind of the rains."
" And so they have to keep track of not only where it's going how much is going what it's costing but what the strength of -- it is at what time it it's gotta there tonight. Now when one of these trucks fully loaded down about it's about or plug twelve yards and Eric how much will that weigh in a yard of concrete is about. So 38000. Pound on top of the way weight of the truck the right that's correct. -- so where does it"
" right over here in the batch plant."
" Bob this is plant one and here's a truck pulling under the booth right now but the real activity is up over head up above us. Up above us is the concrete plant. If -- and we've got a central and explain this location on so all the material it's out there. And it's mixed up top there the aggregate comes up by conveyor belt. Plans. cement is blown up above . then Lenny is just kicked off a batch here and weighing right now he's weighing the materials to go into this load. When the scales are full and we've got a full batch up there it'll drop into the central mix drum. It'll mix the load. And then it'll put it into a holding copper before putting it into the truck. How many yards fit into that central drum that's at ten yard drum that will hold a full ten yards. Amazing effort goes into the truck that the."
" A look at the sample up on the truck. And he's now going to it take a couple of tests that's. make sure the quality is what we want it to be. And which is the test that he is going to perform he's but going to take the temperature. -- An -- it's called a slump it's test. Harmon do you do this every single batch that goes out of here."
" So you've got a metal coat and you're simply. Filling the cone shaped with the concrete. Is there a set number of times that you got to put the rod and we want a level of quality -- three -- there want to Rodney raw each layer And of course the main thing that we're trying to determine here is. The strength of the congregation concrete This will measure"
" The slope of the concrete and the consistency. And the strength of it."
" Frequently a contractor will specify certain slump. Knowing that he. needs it to be more or less pliable. able to flow on a certain job site. Orman is now going to lift the cone off slowly. They sort of slowly and steadily. Going to turn the cylinder over."
" And we will now measure. The deflection of the concrete. "
" What have you got there or when. We have. I have an -- That's apparently it was we'll. That. OK so is this the last step yeah. I now have after the as the driver well we'll. A lot of the work area want. We don't leave remnants of concrete around the city announcement for a moment when we hope so. We try our best of that and then they'll pick up their directions and move on to the job site."