1 / 36

same maturity = same strength

same maturity = same strength. Maturity according to Saul. The product of curing temperature and time ° C x hours (h) °C.h.

casta
Download Presentation

same maturity = same strength

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. same maturity = same strength

  2. Maturity according to Saul The product of curing temperature and time ° C x hours (h) °C.h

  3. Maturityaccordingto Saul

  4. Maturity according to Saul

  5. Weighted maturity The product of curing temperature and time, taking account to the temperature sensitivity of the cement (weighting factor)

  6. Maturity according to Papadakis en Bresson

  7. Maturity formula according To De Vree Rg  10 (C(0,1T - 1,245) – C(-2,245)) / ln C Rg  Weighted maturity in one hour [ °C.h ] T  Average temperature in that hour [ °C ] C  C-value (weighting factor) of the used cement

  8. Determination of C-Value 20°C 1 2 4 5 3 65°C 1 2 3 4 5

  9. C-value depending on the content of Portland cement clinker

  10. Which cement ? Lower temperature lower C-value Higher temperature higher C-value

  11. Maturity table Maturity according to De Vree for 1 hour curing time at x°C, for different C-values

  12. Maturity computer

  13. Thermocouple temperature sensor

  14. Thermocouple temperature sensor

  15. Thermocouple temperature sensor

  16. Thermocouple temperature sensor

  17. Thermocouple temperature sensor

  18. Thermocouple temperature sensor

  19. Calibration curve of a concrete mixture Make 5 test cubes of the concrete mixture 1 2 3 4 5 Measure the weighted maturity in 1 of these cubes Test the compressive strength of the cubes on times depending on the curing rate Range between 8 N/mm² below and 8 N/mm² above target strength At least 2 values below and 2 values above target strength Write down the weighted maturity and the strength of each tested cube

  20. Calibration curve of a concrete mixture Plot the values found in a chart Calculate and draw the regression curve Calculate and draw the calibration curve

  21. Determination of calibration curve

  22. Maturity computer Temperature measurement Maturity measurement Determination of compressive strength Regulating of heating or cooling equipment

  23. Housing

  24. Housing

  25. Regelation heating equipment by maturity computer

  26. Precast concrete industrie

  27. Precast concrete industrie

  28. Climbing formwork

  29. Tunnels

  30. Mass concrete structure

  31. Bridge construction

  32. Road construction

  33. Example printout maturity computer

  34. Summary Weighted maturity is the sum of the products of the curing times and concrete temperatures taking account of the influence of the temperature sensitivity of the cement C-value is the computing factor in the calculation of the weighted maturity, indicating the influence of the temperature sensitivity of the cement

  35. Summary Determination of the C-value In principle by supplier of cement Drawing calibration curve Supllier of mortar Fitting temperature sensors, controling Maturity computer Builder

More Related