摘要
为了改善石膏墙体材料的力学性能,分别采用Y型束状单丝聚丙烯纤维和高强高模聚乙烯醇短纤维作为建筑石膏的增强材料,通过力学性能测试研究了纤维长度和掺量对石膏基复合材料力学性能的影响。结果表明,添加聚丙烯纤维对复合材料力学性能为负面影响,不能直接用于现浇石膏隔墙体系。添加聚乙烯醇纤维对复合材料力学性能有改善作用,纤维长度为9mm,掺量为1.5%时,试样的绝干抗折强度和吸水饱和抗折强度较空白试样分别提高了82.5%和83.9%,抗压强度略低于空白试样。结合弯曲荷载-变形曲线,分析了聚乙烯醇纤维增强石膏基复合材料的断裂机理,结果表明:断裂过程分为基体断裂弹性受力、纤维拔出、破坏三个阶段,纤维与基体的界面黏结能力是纤维抗拉强度能否充分利用的关键。
In order to improve the mechanical properties of gypsum material, Y bundle monofilament polypropylene fiber and high elasticity polyvinyl alcohol fiber are respectively used as reinforced material of building gypsum. The effect of fiber length and fiber content on mechanical properties of gypsum based composite materials is studied by mechanical properties test. The results show that, the effect on mechanical properties of composite material by adding polypropylene fiber is negative, and polypropylene fiber can＇t be applied directly in cast-in-site gypsum partition wall system. Mechanical properties of the composite material can be improved by adding polyvinyl alcohol fiber. When the length of polyvinyl alcohol fiber is 9 mm, the content is 1.5%, the dry flexural strength and water saturated flexural strength of specimen compared with the blank sample are increased by 82.5% and 83.9% respectively, the compressive strength is slightly lower than the blank sample. Combined with the bending load-deformation curve, the fracture mechanism of polypropylene fiber reinforced gypsum based composite material is analyzed. The results show that, the fracture process can be divided into 3 stages： the base material fracture elastic stress stage, fiber pull-out stage and failure stage, the interface bonding capacity between fiber and matrix is the key factor for making the best use of fiber tensile strength.
出处
《混凝土与水泥制品》
2015年第10期77-81,共5页
China Concrete and Cement Products
基金
四川省建筑节能专项基金项目
关键词
现浇石膏隔墙
石膏基复合材料
聚丙烯纤维
聚乙烯醇纤维
Cast-in-site gypsum partition wall
Gypsum based composite materials
Polypropylene fiber
Polyvinyl alcohol fiber
