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.
搭接宽度对打印混凝土基本力学性能的影响
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: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.
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