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https://hdl.handle.net/11681/11522| Title: | Concrete temperature control studies Tennessee-Tombigbee Waterway projects |
| Authors: | United States. Army. Corps of Engineers. Mobile District. Bombich, Anthony A. Sullivan, B. R. (Billy R.) McDonald, J. E. (James E.) |
| Keywords: | Computerized simulation Concrete mixtures Concrete temperature Concrete thermal properties Finite element method Temperature control Tennessee-Tombigbee Waterway |
| Publisher: | Concrete Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; C-77-8. |
| Description: | Miscellaneous paper Abstract: Pertinent physical properties of three mass concrete mixtures were determined and used as input to finite-element programs to calculate temperature rise and resulting thermal strains in mass concrete. This concrete mixture proportioned with coarse aggregate having an elastic modulus of 7.8 x 10 psi produced 1.3 times higher creep and 1. 5 times greater increase in ultimate strain capacity, with lower modulus of elagticity, than did concrete with a coarse aggregate with a modulus of 11 x 10 psi. Concrete mixtures tested produced values for adiabatic temperature rise between 39°F for 3000-psi concrete with 25 percent pozzolan replacement and 85°F for 4000-psi with no pozzolan. Finite-element computer simulations of construction of three structural features namely, dam abutment, spillway, and lock wall monoliths were made at three seasonal construction start dates and several placement rates. The resulting thermal tensile strains when compared with strain capacity of the concrete were excessive for several days after placement of the spillway overflow surface and the lower lifts in the pier of the spillway monolith. Although maximum tensile strain versus strain capacity ratios were 0.78 and 0.55 in dam and lock wall monoliths where a value of 1.0 is required to cause cracking, consideration of rapid ambient temperature drop and accelerated initial temperature rise at elevated placement temperatures could increase these ratios to near the critical 1.0 value. Recommendations include consideration of a reduction in placement temperature for 3000- and 4000-psi concrete; that pozzolan replacement be used in all concrete mixtures; and that insulation be considered for use in selected areas of the structures if cracks occur. |
| Rights: | Approved for public release; distribution is unlimited. |
| URI: | http://hdl.handle.net/11681/11522 |
| Appears in Collections: | Miscellaneous Paper |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| MP-C-77-8.pdf | 4.63 MB | Adobe PDF |  View/Open |