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Experimental Research on Mechanical Properties of In-Situ Printed Concrete Slabs
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摘要: 目前，3D打印混凝土建造的房屋建筑其楼板主要采用预制打印构件现场拼装的方法，但随着大型混凝土3D打印机的深入研发，原位打印房屋的实践也在加速探索中。板构件的现场原位打印需要底模才能实现，为此模拟设临时底模的现场原位打印及分别用打印混凝土叠合板与压型钢板作为永久底模的建造方法，设计了原位打印混凝土板构件受力性能试验，研究其破坏形态、裂缝分布、挠度发展和特征荷载。试验表明，用打印混凝土板为永久模板的构件与使用临时模板整体打印的混凝土板构件均呈现与普通混凝土板类似的整体破坏模式，叠加打印的混凝土层之间以及预制叠合打印的混凝土层间能够形成较好的黏结；而应用压型钢板作为永久底模的板构件则出现压型钢板与打印混凝土间的滑移。Abstract: Currently, the construction of floor slabs of 3D printed concrete buildings mainly adopts the method of on-site assembly of prefabricated printed slabs, but with the in-depth research and development of large concrete 3D printers, the practice of in-situ printing of floor slabs is also accelerating in the exploration. The in-situ printing of floor slabs requires a base mold to achieve, so by simulating the in-situ printing of temporary base mold and the construction method of using printed concrete laminated slab and profiled steel sheet as permanent base mold respectively, the in-situ printed concrete slab specimens were designed to study the damage pattern, crack distribution, deflection development and characteristic load. The tests showed that both the specimens with printed concrete slabs as permanent base mold and the specimens with temporary base mold exhibited similar overall damage patterns as those of ordinary concrete slabs, and good bonds could be formed between the superimposed printed concrete layers and between the prefabricated superimposed printed concrete layers; while the slab specimens with profiled steel sheet applied as permanent base mold showed slippage between the profiled steel sheet and the printed concrete.
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Key words:
- 3D printed concrete /
- in-situ construction /
- slab components /
- mechanical properties
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