为研究再生骨料的预浸碳化处理方式及碳化循环次数对再生混凝土动态力学性能的影响，将强化后的再生骨料100%取代天然骨料制备再生混凝土试件，分别开展静、动态压缩试验。研究结果表明，静态加载时，预浸碳化组的抗压强度随碳化循环次数的增加而增大，而直接碳化组的抗压强度仅在第1次碳化循环后有所提升，继续进行碳化循环对再生混凝土强度的提升效果不明显。动态加载时，预浸碳化组再生混凝土呈现出明显的应变率强化效应，动态抗压强度与动态增加因子均随应变率的增大而提高，相较于普通再生混凝土，再生骨料预浸碳化循环3次后制备的再生混凝土试件动态抗压强度提升了23.8%，而直接碳化组仅提升了5.7%，且动态增加因子与应变率的对数存在良好的线性关系，随应变率的lg10线性增加；当应变率相同时，随着碳化循环次数的增加，动态抗压强度也增大。从能量的角度看，预浸碳化组在高应变率下的比能量吸收值大于低应变率下的比能量吸收值，再次说明了预浸碳化再生骨料混凝土仍具有应变率效应，相同应变率条件下，预浸碳化组的比能量吸收值大于直接碳化组，说明预浸碳化再生骨料提升了再生混凝土的抗冲击性能，且效果优于传统的直接碳化处理。上述研究也为预浸碳化强化再生骨料及再生混凝土在工程结构中的应用提供了可靠的试验结果和理论依据。
Abstract
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.
关键词
再生粗骨料 /
预浸碳化 /
再生混凝土 /
动态力学性能
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Key words
Recycled coarse aggregate /
pre-impregnated carbonation /
recycled concrete /
dynamic mechanical properties
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