Monitoring Concrete Cure/ thermocouple
Monitoring Concrete Cure/ thermocouple
(OP)
Does anyone out there have any information on monitoring the temperatures on a mass concrete pour using a thermocouple?
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Monitoring Concrete Cure/ thermocouple
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RE: Monitoring Concrete Cure/ thermocouple
MASS CONCRETE
CONCRETE POURS HAVING A TOTAL VOLUME IN EXCESS OF 5 CU-M AND A MINIMUM DIMENSION IN EXCESS OF 3 FT SHALL BE CONSIDERED AS MASS CONCRETE
CONCRETE WORK SHALL COMPLY WITH THE RECOMMENDATIONS OF ACI COMMITTEE 207
CEMENT TYPE FOR MASS CONCRETE SHALL BE TYPE LH UNLESS APPROVED BY THE [CONSULTANT | ENGINEER]
MAXIMUM AGGREGATE SIZE SHALL BE 2" UNLESS APPROVED BY THE [CONSULTANT | ENGINEER]
PROVIDE PAIRS OF THERMOCOUPLES IN THE CENTRE OF MASS OF THE CONCRETE POUR
PROVIDE SURFACE THERMOCOUPLE PAIRS AT THE TOP SURFACE OF THE CONCRETE POUR DIRECTLY ABOVE THE THERMOCOUPLE PAIR AT THE CENTRE OF MASS, NEAR THE CENTRE OF TWO ADJACENT VERTICAL FACES AND AT ONE CORNER (5 SURFACE PAIRS TOTAL)
SURFACE THERMOCOUPLE PAIRS SHALL BE PLACED 2" FROM THE OUTSIDE SURFACE AND AT MID DEPTH OF THE CONCRETE POUR
THERMOCOUPLE PAIRS SHALL BE SEPARATED BY A DISTANCE OF APPROX 4'
MAXIMUM TEMPERATURE AT THE CENTRE OF MASS SHALL NOT EXCEED 50%%DC
MAXIMUM TEMPERATURE DIFFERENTIAL BETWEEN THE CENTRE OF MASS AND THE CONCRETE SURFACE SHALL NOT EXCEED 25%%DC
CONTRACTOR SHALL PROVIDE A PROCEDURE OUTLINING PROPOSED METHOD FOR MAINTAINING TEMPERATURE REQUIREMENTS FOR REVIEW BY THE [CONSULTANT | ENGINEER]
RE: Monitoring Concrete Cure/ thermocouple
good stuff.
What is "%DC"?
Does any old thermocouple wire work?
RE: Monitoring Concrete Cure/ thermocouple
You need to talk to someone about logging the information... most test agencies have this type of equipment. Unfortunately, for the project I did the notes up for, they testing agency hadn't a clue about what they were measuring.
Dik
RE: Monitoring Concrete Cure/ thermocouple
I realize that now....I use ALT+0186 to make a º symbol.
We are purchasing the logging device ourselves and monitoring our own pours.
RE: Monitoring Concrete Cure/ thermocouple
Since I've been with my present employer (2 years), they have purchased a laser distance measureing device (Hilti), a temperature measuring device (Laser pointer type) and temperature and humidity data logging devices... I had these prior to starting with them and they have found them so useful. I still have a laser level (also Hilti) and a 5 sec theodolite (70 years old and mint).
We don't have thermocouples or logging device (likely 8 channel) but we have enough electrical and electronic dudes that we could glue one together...
Dik
RE: Monitoring Concrete Cure/ thermocouple
As long as I can figure out how to do this, we figure it is better to spend some money to the equipment rather than pay a testing company...at least this way we have the equipment to show for it. The stuff really isn't too expensive relative to the projects.
It sounds like you just literally hook the thermocouple wires to the data logger and let 'er rip.
RE: Monitoring Concrete Cure/ thermocouple
Dik
RE: Monitoring Concrete Cure/ thermocouple
Can I blame you if it doesnt work?
RE: Monitoring Concrete Cure/ thermocouple
Check your thermocouples before you cast the concrete... for continuity as well as function and correlation. If this is OK, then there's no reason it shouldn't work. If I get a chance, I'll talk to one of the electrical dudes here to see about the data logging stuff...
Dik
RE: Monitoring Concrete Cure/ thermocouple
RE: Monitoring Concrete Cure/ thermocouple
Is 1 or 2 degrees that big of a deal?
Will the unit come with instructions for calibrating?
We are purchasing the logger from Omega.
RE: Monitoring Concrete Cure/ thermocouple
Dik
RE: Monitoring Concrete Cure/ thermocouple
RE: Monitoring Concrete Cure/ thermocouple
Dik
RE: Monitoring Concrete Cure/ thermocouple
RE: Monitoring Concrete Cure/ thermocouple
The thing is really working well.
RE: Monitoring Concrete Cure/ thermocouple
We did calibrate the unit.
The thing that was throwing me off was apparently the logger itself creates some heat and reads a few degrees F higher than a probe left in the air nearby the unit. The mfg. assured me that this was normal.
THanks
RE: Monitoring Concrete Cure/ thermocouple