摘要
为研究玄武岩纤维在普通硅酸盐水泥(OPC)和高贝利特硫铝酸盐水泥(HB-CSA)环境下的长期增强效果,分别对配置玄武岩纤维的普通硅酸盐水泥板(BTR-O)和高贝利特硫铝酸盐水泥板(BTR-H)进行不同龄期下的老化处理和弯曲试验,对比分析不同老化龄期下水泥板的力学性能变化情况,并采用微观测试手段对其进行机理分析。结果表明:未老化时,BTR-O板和BTR-H板的抗弯强度分别是相应基体板的2.20和2.21倍,老化21 d后变为1.10和1.90倍。老化后期,BTR-O板底部纯弯段裂缝数量明显减少,而BTR-H板裂缝数量基本保持不变,BTR-H板的长期力学性能优于BTR-O板;HB-CSA的pH值在各龄期都低于OPC,且水化产物中未发现Ca(OH)2,从而弱化了HB-CSA对纤维的侵蚀,使得BTR-H板在长期使用过程中具有更加优异的力学效果。
In order to study the long-term strengthening effect of basalt fiber in ordinary portland cement(OPC)and high belite calcium sulfoaluminate cement(HB-CSA),the aging treatments and bending tests under different ages were carried out for basalt fiber reinforced ordinary portland cement(BTR-O)and basalt fiber reinforced high belite calcium sulfoaluminate cement(BTR-H).The mechanical properties of cement under different aging periods were compared and the mechanism was analyzed by performing microscopic tests.The results show that the bending strength of unaged BTR-O and BTR-H is 2.20 and 2.21 times respectively of the original matrix,and then become 1.10 and 1.90 times after aging for 21 days.The fracture numbers in bending section of the BTR-O are significantly decreased,while the fracture numbers of BTR-H remain unchanged in the later aging stage,indicating that the long-term mechanical properties of BTR-H are better than BTR-O.The pH value of HB-CSA is lower than OPC at different ages and no Ca(OH)2 is found in hydration products of HB-CSA,which weakens the corrosion of HB-CSA on the fiber and makes BTR-H have more excellent mechanical effect in long-term use.
作者
朱春琪
田稳苓
姜磊
杨佩剑
周健
张文韬
ZHU Chunqi;TIAN Wenling;JIANG Lei;YANG Peijian;ZHOU Jian;ZHANG Wentao(School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao, Shandong 266590, China)
出处
《山东科技大学学报（自然科学版）》
CAS
北大核心
2021年第4期49-55,共7页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(51878238)。
关键词
玄武岩纤维
力学性能
加速老化
水泥基复合材料
增强效果
basalt fiber
mechanical properties
accelerated aging
cement-based composite
strengthening effect
