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为研究养护期沥青混凝土路面不同养护技术在应用过程中产生的碳排放,基于生命周期评价方法,将沥青混凝土路面养护工程划分为材料生产、运输及施工3个阶段。将产品清单与碳排放系数相乘,以定额法为主,理论法为辅,建立各阶段碳排放计算模型。计算了铣刨摊铺、就地热再生、厂拌热再生、薄层罩面以及微表处等5种技术碳排放强度,量化分析不同技术优势特征以及不同旧料掺量下的碳排放。研究结果表明:就地热再生技术机械施工阶段碳排放量最多,达到77%;而其他养护技术材料生产阶段碳排放量最多,达到70%以上;与铣刨重铺技术相比,就地热再生、微表处、超薄罩面和厂拌热再生碳排放降幅分别为37.6%、26.9%、19.8%和12.5%;对于厂拌热再生技术,RAP掺量对厂拌热再生减排效果显著,旧料掺量提高10%,碳排放强度下降0.6kg/(m~3·年)。
In order to study the carbon emission during the application of different curing technologies for curing asphalt concrete pavement during curing period, the asphalt concrete pavement maintenance project is divided into three stages of material production, transportation and construction based on the life cycle assessment method. The product list and carbon emission factor multiplied by the quota method, supplemented by the theoretical method, the establishment of various stages of carbon emission calculation model. The carbon emission intensities of 5 technologies including milling and paving, local thermal regeneration, hot mixing in plant, thin overlay and micro-surfacing were calculated, and the characteristics of different technologies were quantified and the carbon emissions of different old materials were calculated. The results show that the in-situ thermal recycling technology has the largest carbon emissions during the construction period of machinery, reaching 77%; while the other curing technologies have the most carbon emissions during the production stage, reaching more than 70%; compared with milling resurfacing technology, The emission reduction of micro-surfacing, ultra-thin overlay and hot mix for plant mixing were 37.6%, 26.9%, 19.8% and 12.5%, respectively. For the hot mix plant technology, The amount of old materials increased by 10%, carbon emission intensity decreased 0.6kg / (m ~ 3 · years).