玄武岩纤维网格增强磷酸镁水泥砂浆复合材料力学性能  

Mechanical properties of basalt fiber reinforced polymer grids reinforced magnesium phosphate cement mortar composite

作　　者：谢剑 刘家旺 李伟 金凌翼[1] XIE Jian;LIU Jiawang;LI Wei;JIN Lingyi(Key Laboratory of Coast Civil Structure Safety,Ministry of Education,School of Civil Engineering,Tianjin University,Tianjin 300350,China;Beijing Engineering Research Center of Existing Building Renovation(Tianjin Branch),Tianjin 300350,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]天津大学建筑工程学院,滨海土木工程结构与安全教育部重点实验室,天津300350 [2]北京市既有建筑改造工程技术研究中心(天津分中心),天津300350 [3]兰州交通大学土木工程学院,兰州730070

出　　处：《复合材料学报》2024年第10期5492-5503,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(52068043)。

摘　　要：为了研究钢纤维与玄武岩纤维(BFRP)网格对磷酸镁水泥砂浆(MPCM)力学性能的增强效果,制备了BFRP网格MPCM复合材料(GRMM)。通过轴向拉伸试验和四点弯曲试验,研究材料复合方式(钢纤维增强、BFRP网格增强、复合增强)、BFRP网格厚度(1 mm、2 mm、3 mm)和BFRP网格表面形式(未处理、粘砂)对复合材料拉伸应力-应变曲线、弯曲应力-挠度曲线与关键力学参数的影响规律,以及钢纤维、BFRP网格在GRMM中的作用机制。结果表明:钢纤维主要在GRMM受力前期发挥作用,可以有效地抑制裂缝的产生,起到了增强、增韧的作用,钢纤维的掺入使拉伸试件与弯曲试件承载力分别提高了24.23%与215.33%,并提高了两类试件的抗裂性能、变形与耗能能力;BFRP网格作为拉应力的主要承担者,作用于GRMM整个受力过程,使两类试件的峰值变形提升了70倍以上,但试件中BFRP网格与MPCM受力并不协调;两种材料复合增强下,GRMM综合了钢纤维对基体的增强效果与BFRP网格的良好变形性能,其抗裂性能、强度、变形性能及耗能能力均得到提升;随着BFRP网格厚度的增加,GRMM试件强度与耗能能力得到进一步提升;BFRP网格表面进行粘砂处理对GRMM各项性能影响并不明显。To investigate the influences of basalt fiber reinforced polymer(BFRP)grid and steel fibers on the mechanical properties of magnesium phosphate cement mortar(MPCM),BFRP grid reinforced MPCM composite(GRMM)was prepared.The effects of material forms(steel fiber reinforced,BFRP grid reinforced and composite reinforced),BFRP grid thicknesses(1 mm,2 mm and 3 mm),and BFRP grid surface forms(untreated and sandsticked)on the tensile stress-strain curves,bending stress-deflection curves,and key indexes of GRMM were investigated by the axial tensile test and four-point bending test.Moreover,the roles of steel fibers and BFRP grid in GRMM were also studied.The results show that steel fibers mainly play a role in the early stage,which can effectively inhibit the generation of cracks and improve the strength and toughness of GRMM.The incorporation of steel fibers increases the tensile and bending capacity by 24.23%and 215.33%,respectively,and improves the crack resistance,ductility and energy consumption of both types of specimens.The tensile stress is the mainly borne by BFRP grid,which plays a role throughout the whole loading process of GRMM.The incorporation of the BFRP grid improves the peak deformation of both tests by more than 70 times,but the BFRP grid is not coordinated with the MPCM in the specimen.Combined with the strengthening effects of steel fibers on the matrix and the good deformation of BFRP grid,the cracking resistance,strength,ductility and energy dissipation capacity of MPCM matrix are improved.As the thickness of the BFRP grid increases,the strength and energy dissipation capacity of the GRMM specimens are further improved.Sticking sand on the BRFP grid does not significantly affect the mechanical properties of GRMM.

关 键 词：磷酸镁水泥砂浆 玄武岩纤维网格 纤维增强 拉伸性能 弯曲性能 

分 类 号：TB332[一般工业技术—材料科学与工程]