Energy Performance of Alkali-Activated Cement-Based Concrete Buildings
Energy Performance of Alkali-Activated Cement-Based Concrete Buildings
复制标题
碱活化水泥基混凝土建筑的能源性能
DOI：
10.1061/9780784480502.026
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Srubar, Wil V.
中科院分区：
文献类型：
--
作者：
Gevaudan, Juan Pablo;Srubar, Wil V.
在美国，建筑物的建造和运营约占总能源消耗和二氧化碳排放总量的40%。为了减少这些环境影响，真正的净零能源建筑需要通过结合使用高性能建筑围护材料和现场可再生能源发电来抵消运营和体现的能源和碳。新型碱激发水泥（AAC）混凝土具有潜在的好处，如较低的导热系数，等效的抗压强度，并可能降低环境足迹，这转化为减少混凝土材料的量和较低的环境影响相比，普通波特兰水泥（OPC）混凝土。这项工作的目的是量化和比较潜在的体现和运营节能与使用矿渣基AAC混凝土与传统的OPC混凝土和OPC+10%矿渣混凝土在商业建筑围护结构。考虑两个功能单元进行比较，即（a）恒定体积置换和（B）外墙组件的恒定R值。使用能源部（DOE）的商业建筑参考建筑模型，以提供一个一致的基准进行比较，使用EnergyPlus，一个整体建筑能源建模工具，量化的运营能源，而通过生命周期评估（LCA）使用从文献中获得的库存数据进行量化的体现能源。结果表明，虽然总的运营节能潜力可以忽略不计，但AAC混凝土建筑物的材料数量以及整个气候区域的总体现能量都在不断减少。除了节能潜力外，本研究的结果还强调了在计算真正的净零能耗建筑的总能耗时，除了运行能耗外，还需要考虑隐含能耗。
In the United States, the construction and operation of buildings account for approximately 40% of total energy consumption and total carbon dioxide emissions. In order to reduce these environmental impacts, truly net-zero energy buildings necessitate that both operational and embodied energy and carbon are offset through the combined use of high-performance building envelope materials and on-site renewable energy generation. Novel alkali-activated cement (AAC) concrete exhibits potential benefits such as lower thermal conductivity, equivalent compressive strength, and potentially lower environmental footprint, which translate to reductions in the amount of concrete material and lower environmental impacts compared to ordinary portland cement (OPC) concrete. The objective of this work was to quantify and compare the potential embodied and operational energy savings associated with the use of slag-based AAC concrete in relation to conventional OPC concrete and OPC+10% slag concrete in commercial building envelopes. Two functional units were considered for comparison, namely (a) constant volume replacement and (b) constant R-value of external wall assemblies. Using the Department of Energy (DOE) reference building models for commercial buildings to provide a consistent baseline for comparison, operational energy was quantified using EnergyPlus, a whole-building energy modeling tool, while embodied energy was quantified via lifecycle assessment (LCA) using inventory data obtained from the literature. The results demonstrate that, while total operational energy savings potential were negligible, AAC concrete buildings exhibit consistent reductions in material quantities and, thus, total embodied energy across climate regions. In addition to energy savings potential, the results of this study highlight the necessity to consider embodied energy in addition to operational energy when calculating the total energy consumption of truly net-zero energy buildings.