Jeong Seung-Tae, Bui Quang-The, Yang In-Hwan
Department of Civil Engineering, Kunsan National University, Kunsan 54150, Korea.
Materials (Basel). 2022 Jul 27;15(15):5204. doi: 10.3390/ma15155204.
Porous concrete has recently gained increasing attention in the construction industry. To improve the properties of porous concrete, coal bottom ash (CBA) was used as the aggregate in the concrete mixtures studied herein. Hybrid CBA aggregates, including a 20% proportion of particles with sizes of 1.22.5 mm and an 80% proportion of particles with sizes of 2.55.0 mm, were used in the mixtures. Various water/cement ratios ranging from 0.25 to 0.35 were used in the mixtures. The effects of compaction at 0.5, 1.5, and 3.0 MPa on the properties of the porous concrete were also examined. The increase in the water/cement ratio reduced the unit weight and thermal conductivity while increasing the porosity of the porous concrete. Although the compaction had a significant impact on the other properties of the porous concrete, the thermal property was not significantly influenced. By using CBA in porous concrete, the mechanical and thermal properties of the concrete were significantly improved. Finally, the relationships between the thermal conductivity and other properties of the porous concrete were investigated.
多孔混凝土最近在建筑行业中受到越来越多的关注。为了改善多孔混凝土的性能，本文研究中使用煤底灰（CBA）作为混凝土混合物中的骨料。混合物中使用了混合CBA骨料，包括20%比例的粒径为1.22.5毫米的颗粒和80%比例的粒径为2.55.0毫米的颗粒。混合物中使用了0.25至0.35的各种水灰比。还研究了0.5、1.5和3.0兆帕的压实对多孔混凝土性能的影响。水灰比的增加降低了多孔混凝土的单位重量和热导率，同时增加了其孔隙率。尽管压实对多孔混凝土的其他性能有显著影响，但对热性能没有显著影响。通过在多孔混凝土中使用CBA，混凝土的力学和热性能得到了显著改善。最后，研究了多孔混凝土热导率与其他性能之间的关系。
