Concrete ??

 I definitely know what you're talking about I was in the game for 27 years and was certified in Agg 1&2 concrete 1&2 and asphalt 1&2 about the only thing I couldn't do was job mixes but help on a lot of them, I done most of the proportionate material for concrete and asphalt yes I run a lot of sample each year, I covered from just out side of Mechanicsville to Montour just east of Marshalltown, had all of the Cedar Rapids area including the quarry on the north side of Robins and the one just west of Springville ,one up by Coggon, also one out by Vinton and one by Garrinson and one we call 4 county just south of the CR airport and three sand pits, The sand pit were just spot check because the plant man was certified also. I would also did a lot of asphalt testing when they were running out of Moscow quarry which is west of Wilton on 6. I remember when doing concrete or asphalt testing the day were long and on the go all the time and the guys that done the daily reports would still be their when I was walking out the door after getting all the test equipment clean up and the lab for the next day some day were 14 hrs and some long if I had to help cut cords in the mornings. I didn't do concrete test all that often just when someone need of or sick. I know with concrete you had to be around it to be good at it, I had to almost carry the book around with me. Thanks for letting rumbling on.