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为评价再生混凝土CO_2的排放量,构建了再生混凝土CO_2排放量化模型.运用生命周期评价技术,对原材料生产、运输、再生混凝土制备、施工建造、拆除废弃等阶段建立了CO_2排放量的计算方法,并计入碳化作用影响,提出了再生混凝土碳化吸收模型.通过收集各阶段基础数据,得到了1 m3的C30再生混凝土CO_2排放量.最后,将排放量转化为环境成本和等量吸收所需的绿化面积或树木棵数,进行环境影响评价.结果表明,1 m3C30的再生混凝土生命周期CO_2排放量随再生粗骨料取代率的提高而降低,当取代率为30%,50%,70%,100%时,CO_2排放量分别为314.2,310.9,307.6,301.4 kg;CO_2排放量随取代率提高而降低的主要原因为再生粗骨料运输和混凝土碳化作用;对比普通混凝土,再生混凝土在CO_2减排上具有更优的环境价值.
In order to evaluate the CO 2 emission of recycled concrete, a quantitative model of CO 2 emission of recycled concrete was constructed.Calculation method of CO 2 emission was established for the production, transportation, recycled concrete preparation, construction, dismantling and disposal of waste concrete by life cycle assessment techniques, And the effect of carbonation is taken into account and a carbonation absorption model of recycled concrete is proposed.The CO2 emissions of 1 m3 of C30 recycled concrete are obtained by collecting the basic data of each stage.Finally, the emissions are converted into environmental costs and required for equal absorption The results showed that the CO 2 emission of 1 m3 C30 recycled concrete decreased with the replacement rate of recycled coarse aggregate. When the replacement rate was 30%, 50%, 70% 100%, the CO 2 emissions were 314.2, 310.9, 307.6 and 301.4 kg respectively. The main reason for the decrease of CO 2 emission with the substitution rate was the transportation of recycled coarse aggregate and the carbonation of concrete. Compared with ordinary concrete and recycled concrete, Pai has better environmental value.