In order to study the effects of the pre-impregnated carbonation treatment of recycled aggregate and the number of carbonation cycles on the dynamic mechanical properties of recycled concrete, 100% of the strengthened recycled aggregate replaced natural aggregate to prepare recycled concrete specimens, and static and dynamic compression tests were carried out respectively. The results showed that, during static loading, the compressive strength of the pre-impregnated carbonation group increased with the increase of the number of carbonation cycles, while the compressive strength of the direct carbonation group increased only after the 1st carbonation cycle, and the effect of continuing carbonation cycles on the strength of recycled concrete was not obvious. During dynamic loading, the recycled concrete in the pre-impregnated carbonation group showed obvious strain rate strengthening effect, and the dynamic compressive strength and dynamic increase factor both increased with the increase of strain rate, compared with ordinary recycled concrete, the dynamic compressive strength of recycled concrete specimens prepared after 3 times of the pre-impregnated carbonation cycle of recycled aggregate increased by 23.8%, while that of the direct carbonation group increased by only 5.7%, and the dynamic increase factor and the strain rate There is a good linear relationship between the dynamic increase factor and the logarithm of the strain rate, which increases linearly with lg10 of the strain rate; when the strain rate is the same, the dynamic compressive strength increases with the increase in the number of carbonation cycles. From the energy point of view, the specific energy absorption value of the pre-impregnated carbonation group under high strain rate is larger than that under low strain rate, which again shows that the pre-impregnated carbonation recycled aggregate concrete still has the strain rate effect, and the specific energy absorption value of the pre-impregnated carbonation group is larger than that of the direct carbonation group under the condition of the same strain rate, which indicates that the pre-impregnated carbonation recycled aggregate enhances the impact resistance of the recycled concrete, and the effect is better than that of the traditional direct Carbonization. The above study also provides reliable experimental results and theoretical basis for the application of pre-impregnated carbonized reinforced recycled aggregates and recycled concrete in engineering structures.
Key words
Recycled coarse aggregate /
pre-impregnated carbonation /
recycled concrete /
dynamic mechanical properties
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Footnotes
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