Experimental Investigation and Modeling the Heat of Hydration in Mass Concrete Structures
The hydration of cement in mass concrete structures produces high temperature.The temperature in the core of the mass concrete structures is higher than the temperature in the surfaces that are closer to ambient air. This temperature gradient leads to the development of thermal stresses, which may c...
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| Format: | masterThesis |
| Published: |
2013
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| Online Access: | https://eprints.kfupm.edu.sa/id/eprint/139128/1/Muneer-PhD_Dissertation_.pdf https://eprints.kfupm.edu.sa/id/eprint/139128/2/Muneer-PhD_Dissertation_.pdf |
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| Summary: | The hydration of cement in mass concrete structures produces high temperature.The temperature in the core of the mass concrete structures is higher than the temperature in the surfaces that are closer to ambient air. This temperature gradient leads to the development of thermal stresses, which may cause cracking if thermal stresses exceed the tensile strength of concrete at early age. This research focuses on conducting an experimental program for 46 different mixes using iQdrum heat signature and heat box to obtain the heat of hydration and temperature rise. The mechanical properties of these concrete mixes such as tensile strength, compressive strength, and modulus of elasticity were also conducted. The effect of mineral admixtures, such as fly ash, ground granulated blast furnace (GGBFS) slag, and silica fume, on heat of hydration was investigated. The effect of steel and polypropylene fibers on the heat of hydration and on the cracking index of mass concrete at early age was studied. The temperature rise, the peak temperatures, and strains for different seven mock-up specimens and for actual structures such as pilescap, were monitored. The viscoelastic behavior of mass concrete at early age was simulated by using the finite element nonlinear approach The finite element model predicted the temperature rise in the mass concrete structures, and associated thermal stresses The finite element model has ability to indicate to whether the cracks will form or not. Based on experimental and numerical investigations, guidelines will be developed for mass concrete in Kingdom of Saudi Arabia (KSA). These guidelines will help in reducing the risk of cracking due to high temperature gradient between core of concrete and its surface. |
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