摘要
为克服普通混凝土脆性大、易开裂的缺点,探讨了聚丙烯纤维的掺量对混凝土力学性能的影响及其机理,在混凝土拌制过程中,将长度为18 mm的聚丙烯纤维分别以0 kg/m3、0.3 kg/m3、0.6 kg/m3、0.9 kg/m3、1.2 kg/m3、1.5 kg/m3、1.8 kg/m3、2.1 kg/m3、2.4 kg/m3和2.7 kg/m3的掺量掺入。共配置10组试块,进行无侧限抗压强度、抗折强度和劈裂抗拉强度试验。试验结果表明:无侧限抗压强度、抗折强度和劈裂抗拉强度都随着纤维掺量的增加先增大后减小;当纤维掺量为0.6 kg/m3时,纤维的加筋作用得到最大的发挥,抗折强度和劈裂抗拉强度均达到最大值;当纤维掺量为0.9 kg/m3时,无侧限抗压强度达到最大值。此外,在混凝土中石子和砂的作用下,纤维的形状发生改变,增加了纤维的粗糙度,加强界面之间的力学作用。
In order to overcome the brittleness and cracking of the plain concrete and explore the influence of polypropylene fiber content on the strength and mechanical behaviors of polypropylene fiber reinforced concrete, 18 mm polypropylene fiber was included in concrete at ten percentage ,ie. 0 kg/m3 , 0.3 kg/ m3, 0.6kg/m3,0.gkg/m3, 1.2kg/m3, 1.5 kg/m3, 1.8kg/m3,2.1 kg/m3,2.4kg/m3,2.7kg/m3 during the concrete mixing process. Ten groups of samples were prepared and subjected to unconfined compression test, flexural test, tensile test. The result shows that the flexural strength and tensile strength increase with the increase of polypropylene fiber content , but decrease when the polypropylene fiber content is larger than 0. 6 kg/m3. The maximum value of flexural strength and tensile strength are observed at the polypropylene fiber content of 0. 6 kg/m3, while the maximum value of compressive strength reaches its peak when the content of polypropylene fibers increases to O. 9 kg/m3. Besides, the superficial roughness of fiber increases because of the impact between sands, stone and fibers during the mixing or compressing process, which changes the shape of the fiber and increases the mechanical functions between interfaces.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2015年第6期1694-1699,共6页
Bulletin of the Chinese Ceramic Society
基金
青海省交通厅科技项目(43800062-X-200231800036)
关键词
聚丙烯纤维
掺量
混凝土
力学性能
polypropylene fiber
mixing amount
concrete
mechanical property
