Jia Zhiyou, Aguiar José, Cunha Sandra, de Jesus Carlos
Centre for Territory, Environment and Construction (CTAC), Department of Civil Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal.
Materials (Basel). 2023 Sep 18;16(18):6267. doi: 10.3390/ma16186267.
Increasing construction and demolition waste (CDW) and the large amount of energy consumption in the building operation process are high-profile issues at present. In the construction industry, recycled aggregated (RA) from CDW can be reutilized in construction, along with green materials, for example, as a road base layer, as aggregate in concrete, etc. Phase change materials (PCM) are often used as building materials due to their good latent heat storage properties. With the use of RA as a matrix to absorb PCM, a thermal performance aggregate can be obtained. This work studied the physical properties of RA from Portugal and combined PCM with RA to prepare a green thermal aggregate through two methodologies using a vacuum and atmospheric pressure. The green aggregate was used in concrete to observe its effect on the compressive strength of concrete. The results showed that the amount of PCM absorbed by the RA mainly depends on the porosity of the matrix material. At the same time, the volume expansion coefficient of PCM was 2.7%, which was not enough to destroy the RA. Ultimately, as the amount of green thermal aggregate increases, the compressive strength of concrete decreases. Green thermal aggregate prepared under vacuum conditions has a greater negative impact on the compressive strength of concrete.
目前，建筑和拆除废物（CDW）的不断增加以及建筑运营过程中的大量能源消耗是备受关注的问题。在建筑业中，CDW产生的再生骨料（RA）可与绿色材料一起重新用于建筑，例如用作道路基层、混凝土中的骨料等。相变材料（PCM）因其良好的潜热存储特性而常被用作建筑材料。通过使用RA作为吸收PCM的基体，可以获得一种热性能骨料。这项工作研究了来自葡萄牙的RA的物理特性，并通过真空和常压两种方法将PCM与RA结合，制备了一种绿色热骨料。将这种绿色骨料用于混凝土中，观察其对混凝土抗压强度的影响。结果表明，RA吸收的PCM量主要取决于基体材料的孔隙率。同时，PCM的体积膨胀系数为2.7%，不足以破坏RA。最终，随着绿色热骨料用量的增加，混凝土的抗压强度降低。在真空条件下制备的绿色热骨料对混凝土抗压强度的负面影响更大。
