大型木丝水泥墙板的力学性能试验研究

Experimental study on mechanical properties of large-scale wood wool cement wall board

为了研究大型木丝水泥墙板的力学性能,以220 mm板厚的大型木丝水泥墙板上裁取的不同规格墙板为试验对象,进行了抗压性能、3点和4点抗折性能及抗弯性能试验研究。试验结果表明:木丝水泥复合墙板平行板面方向的抗压强度比垂直板面方向高,垂直板面方向的抗压强度按照行业标准《木丝水泥板》(JG/T 357—2012),以压缩10%的应力作为其抗压强度的表征;木丝水泥复合墙板表面抹灰能够提高其平行板面方向的抗压强度,其中钢筋增强抹灰层的效果最为明显。不同抗折试验引起不同的受力状态以及过高的含水率都会对木丝水泥复合墙板的抗折强度产生不利影响,导致3点抗折试验所得抗折强度高于4点抗折试验的强度;木丝水泥复合墙板的抗弯承载能力和挠度均满足相应规范要求,表现出了较好的韧性,但不能完全满足板表面抗开裂的要求。该研究结果可为大型木丝水泥墙板的工程应用提供理论指导。

In order to study the mechanical properties of large wood wool cement wallboard,different sizes of wallboard cut from large wood wool cement wallboard with 220 mm board thickness were used as test objects,and the compressive properties,3-point and 4-point flexural properties and flexural properties were tested and studied.The test results show that:the compressive strength of wood wool cement composite wallboard in the parallel board face direction is higher than that in the vertical board face direction,and the compressive strength in the vertical board face direction is characterized by a stress of 10%compression according to the industry standard Wood wool cement boards(JG/T 357-2012),the surface plastering of wood wool cement composite wallboard can improve its compressive strength in the parallel board face direction compressive strength,with the most obvious effect of steel reinforced plaster layer.Different flexural tests cause different stress states and high moisture content can adversely affect the flexural strength of wood wool cement composite wall panels,resulting in higher flexural strength obtained from the 3-point flexural test than the 4-point flexural test;the flexural bearing capacity and deflection of wood wool cement composite wall panels meet the corresponding code requirements and exhibit good toughness,but cannot fully meet the requirements of cracking resistance on the panel surface.The result s of this study can provide theoretical guidance for the engineering application of large wood wool cement wall panels.