- 武 雷，孫 遠，楊 威
引用本文摘 要：混凝土層疊打印成型時，其力學性能受工藝的影響較大。為探究打印過程中條帶的搭接寬度對打印混凝土構件的抗壓強度、雙向劈裂抗拉強度的影響，使用極坐標系3D打印機按不同的搭接寬度，打印了多組混凝土立方體試件，并與現澆試件的抗壓及劈裂性能做了對比試驗。結果表明，層疊打印構件的抗壓強度折減明顯，搭接寬度較低時折減可達到一半，隨著搭接寬度的提升，打印試件的抗壓強度呈非線性增長；打印試件順紋橫紋下的截面劈裂抗拉強度均低于現澆試件，順紋折減更加明顯。搭接寬度的增加會提升雙向抗拉強度，對于順紋截面，搭接寬度較低時提升明顯，后趨于穩定，對于橫紋截面，其主要呈現為一種線性變化形式，趨于現澆抗拉強度。 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.
武雷,孫遠,楊威.搭接寬度對打印混凝土基本力學性能的影響[J].混凝土與水泥制品,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.