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搭接宽度对打印混凝土基本力学性能的影响
Experimental Study on Influence of Lap Width on the Basic Mechanical Properties of Printed Concrete
2019年第9期
3D打印;搭接宽度;抗拉强度对比;劈裂抗拉强度对比
3D printing; Lap width; Comparison of tensile strength; Comparison of splitting tensile strength
2019年第9期
10.19761/j.1000-4637.2019.09.001.05
国家重点研发计划资助(2017YFC0703700)。
武 雷,孙 远,杨 威
东南大学土木工程学院,南京 211189

武 雷,孙 远,杨 威

武雷,孙远,杨威.搭接宽度对打印混凝土基本力学性能的影响[J].混凝土与水泥制品,2019(9):1-5.

WU L,SUN Y,YANG W.Experimental Study on Influence of Lap Width on the Basic Mechanical Properties of Printed Concrete[J].China Concrete and Cement Products,2019(9):1-5.

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摘 要:混凝土层叠打印成型时,其力学性能受工艺的影响较大。为探究打印过程中条带的搭接宽度对打印混凝土构件的抗压强度、双向劈裂抗拉强度的影响,使用极坐标系3D打印机按不同的搭接宽度,打印了多组混凝土立方体试件,并与现浇试件的抗压及劈裂性能做了对比试验。结果表明,层叠打印构件的抗压强度折减明显,搭接宽度较低时折减可达到一半,随着搭接宽度的提升,打印试件的抗压强度呈非线性增长;打印试件顺纹横纹下的截面劈裂抗拉强度均低于现浇试件,顺纹折减更加明显。搭接宽度的增加会提升双向抗拉强度,对于顺纹截面,搭接宽度较低时提升明显,后趋于稳定,对于横纹截面,其主要呈现为一种线性变化形式,趋于现浇抗拉强度。 Abstract: When the concrete is printed by layered superimposed, its mechanical properties are greatly affected by the process. In order to explore the influence of the lap width of the strip on the compressive strength and the two-way splitting tensile strength of the printed concrete members, a plurality of sets of concrete cube specimens were printed using a polar coordinate system 3D printer according to different overlapping widths, a comparison test with the cast-in-place test piece for compression and splitting. The results show that the compressive strength of the laminated printing member is obviously reduced. When the overlapping width is low, the reduction can be half. With the increase of the overlapping width, the compressive strength of the printed test piece increases non-linearly. The tensile strength of the section under the transverse stripes is lower than that of the cast-in-place specimens, and the reduction of the grain is more obvious. The increase of the lap width will increase the two-way tensile strength. For the cross section, the lap width is lower and the lift is obvious, and then the stability tends to be stable. For the cross section, it mainly appears as a linear variation, tending to cast in place tensile strength.
英文名 : Experimental Study on Influence of Lap Width on the Basic Mechanical Properties of Printed Concrete
刊期 : 2019年第9期
关键词 : 3D打印;搭接宽度;抗拉强度对比;劈裂抗拉强度对比
Key words : 3D printing; Lap width; Comparison of tensile strength; Comparison of splitting tensile strength
刊期 : 2019年第9期
DOI : 10.19761/j.1000-4637.2019.09.001.05
文章编号 :
基金项目 : 国家重点研发计划资助(2017YFC0703700)。
作者 : 武 雷,孙 远,杨 威
单位 : 东南大学土木工程学院,南京 211189

武 雷,孙 远,杨 威

武雷,孙远,杨威.搭接宽度对打印混凝土基本力学性能的影响[J].混凝土与水泥制品,2019(9):1-5.

WU L,SUN Y,YANG W.Experimental Study on Influence of Lap Width on the Basic Mechanical Properties of Printed Concrete[J].China Concrete and Cement Products,2019(9):1-5.

摘要
参数
结论
参考文献
引用本文

摘   要:混凝土层叠打印成型时,其力学性能受工艺的影响较大。为探究打印过程中条带的搭接宽度对打印混凝土构件的抗压强度、双向劈裂抗拉强度的影响,使用极坐标系3D打印机按不同的搭接宽度,打印了多组混凝土立方体试件,并与现浇试件的抗压及劈裂性能做了对比试验。结果表明,层叠打印构件的抗压强度折减明显,搭接宽度较低时折减可达到一半,随着搭接宽度的提升,打印试件的抗压强度呈非线性增长;打印试件顺纹横纹下的截面劈裂抗拉强度均低于现浇试件,顺纹折减更加明显。搭接宽度的增加会提升双向抗拉强度,对于顺纹截面,搭接宽度较低时提升明显,后趋于稳定,对于横纹截面,其主要呈现为一种线性变化形式,趋于现浇抗拉强度。
Abstract: When the concrete is printed by layered superimposed, its mechanical properties are greatly affected by the process. In order to explore the influence of the lap width of the strip on the compressive strength and the two-way splitting tensile strength of the printed concrete members, a plurality of sets of concrete cube specimens were printed using a polar coordinate system 3D printer according to different overlapping widths, a comparison test with the cast-in-place test piece for compression and splitting. The results show that the compressive strength of the laminated printing member is obviously reduced. When the overlapping width is low, the reduction can be half. With the increase of the overlapping width, the compressive strength of the printed test piece increases non-linearly. The tensile strength of the section under the transverse stripes is lower than that of the cast-in-place specimens, and the reduction of the grain is more obvious. The increase of the lap width will increase the two-way tensile strength. For the cross section, the lap width is lower and the lift is obvious, and then the stability tends to be stable. For the cross section, it mainly appears as a linear variation, tending to cast in place tensile strength.

关键词:
3D打印;搭接宽度;抗拉强度对比;劈裂抗拉强度对比
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(1)搭接宽度较低时,打印构件抗压强度折减明显,随着搭接宽度的提升,构件抗压强度显著提升,这种提升是非线性的,搭接宽度低时提升明显,搭接宽度超过5 mm时,抗压强度变化趋于稳定。
(2)搭接宽度对打印构件条段黏结性能有显著影响,搭接宽度低会导致条段黏结效果较差,薄弱面为平行于打印路径的竖向截面,此截面抗拉强度相对于现浇构件明显偏小。通过提升搭接宽度,打印构件劈裂抗拉强度可以得到改善,但是较之于现浇构件,还是存在一定程度的折减。
(3)对打印构件进行双向劈裂抗拉试验发现,垂直于打印路径方向截面的抗拉强度高于平行打印路径方向截面,且相对于现浇构件折减较少。通过提升搭接宽度,其横纹抗拉强度会得到提升,搭接宽度为8 mm时,其抗拉强度已经达到现浇构件的91.39%。

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武雷,孙远,杨威.搭接宽度对打印混凝土基本力学性能的影响[J].混凝土与水泥制品,2019(9):1-5.

WU L,SUN Y,YANG W.Experimental Study on Influence of Lap Width on the Basic Mechanical Properties of Printed Concrete[J].China Concrete and Cement Products,2019(9):1-5.

 

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