Abstract
The tensile creep behavior is extremely important in crack prediction and stress analysis of concrete. The main objective is investigating the effects of the silica fume on the tensile basic creep of early-aged concrete. The effect of silica fume on tensile creep was studied using lever-type tensile creep tester. Silica fume amount by weight of total cementing material was 0%, 5%, 10% and 15%. Results show that concrete exhibits larger tensile basic creep strain if loaded at early age. The development characteristic of tensile basic creep of concrete with different silica fume content is that development rate is relatively fast after loading 12h, and slowes down gradually after loading 12h. The early age tensile basic creep of concrete increases with the increasing of the content of silica fume.
Highlights
Silica fume is a substance resulting from a chemical reaction taking place between high purity quartz and coke in the process of smelting ferro-silicon
In order to study the influence of the content of silica fume on tensile creep of concrete, silica fume (0%, 5%, 10% and 15% by weight of cement) was added to concrete partially replace cement
The splitting tensile strength of concrete for different content of silica fume was studied at the age of 3 days
Summary
Silica fume is a substance resulting from a chemical reaction taking place between high purity quartz and coke in the process of smelting ferro-silicon. It can be collected from high temperature waste gas in the flues by using dust collecting device. If silica fume is discharged into the air along with the exhaust gas of electric-arc furnace, serious dust pollution will be caused. It contained amorphous SiO2 more than 90%. This paper will research the effect of silica fume on tensile creep of early-age concrete
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