| In this thesis, the influences of combinations of slag, fly ash and expansive agent at different rations on the mechanical properties and durability of high performance concrete (HPC) were studied. Under the fluctuation of water-binder ration, mix proportion, curing conditions, the variable laws of compressive strength, split tensile strength, flexural strength, elastic modulus, drying shrinkage, chloride permeability, and frost resistance were discussed.The results indicated that slag added to HPC could decrease early strength and drying shrinkage, however, 28-days strength, chloride permeability, carbonization resistance were improved. The dominant complementation effect was showed when the proportion of slag and fly ash was appropriate. Early strength of HPC added with expansive agent decreased, but drying shrinkage was still great. We found it necessary for HPC to prolong the water curing age, which could control drying shrinkage more effectively. After HPC was compressed, chloride permeability was declined. |
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