期刊
JOURNAL OF BUILDING ENGINEERING
卷 43, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jobe.2021.103074
关键词
Cementitious composites; 3D printing technology; Lattice; Mechanical behavior; Thermal conductivity
资金
- National Natural Science Foundation of China [51905350, 51778373]
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering (SZU) [2020B1212060074]
The study introduces a novel 3D core-framework lattice cementitious composite material, which combines printed polymeric framework with cement mortar to enhance ductility and specific strength, while also exhibiting low thermal conductivity. This innovative design approach holds significance in the field of building materials.
How to design energy-efficient building materials, theoretically requiring a balance of mechanical properties and thermal conductivity, remains a crucial challenge in construction & building fields. Recently there is an increased interest in using 3D concrete printing technology to automatically manufacture complicated and customized constructions. Nevertheless, majority of printed constructions are still solid and have a low quality in the interface performance. Inspired by the lightweight lattice architecture, 3D core-framework lattice cementitious composites (CS-LCCs) is proposed in this work, which consists of printed polymeric framework and cement mortar. Results show that although the average compressive strength of CS-LCCs is lower than that of the cubic sample fabricated using the cement mortar (40 x 40 x 40 mm(3)), the specific strength of CS-LCCs approaches that of cubic one. The ductility of CS-LCCs is obviously improved due to the effect of polymeric framework. According to the test and finite element analysis, a hinging and stretching couple deformation mechanism is used to elaborate the deformation mechanism of CS-LCCs. Additionally, the CS-LCCs also exhibit low thermal conduc-tivities at various temperatures owing to the ordered porous characteristic of lattice.
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