摘要
以高强石膏、粉煤灰、矿渣为原材料,利用4因素4水平正交试验对2种纤维(苎麻纤维、聚丙烯纤维),2种激发剂(NaOH、生石灰)4个因素共16组试样进行基本力学性能测试。对4组不同配合比的复合墙板材料进行了水化反应机理和破坏机理分析。正交试验结果表明:碱性激发剂对提高复合墙板材料的抗压强度起主要作用,掺入苎麻纤维明显提高复合墙板的抗折强度,苎麻纤维、聚丙烯纤维、NaOH、生石灰的最佳掺量分别为1.5%、1.0%、0.3%、10%;在激发剂创造的碱性反应环境下,胶凝体水化反应加速,晶体快速形成。在试件受弯时,苎麻纤维起到了主要的抗裂作用,高抗拉强度的聚丙烯纤维在试件内苎麻纤维断裂后起到了主要的阻裂作用。
The mechanical properties of two kinds of fibers(ramie fiber and polypropylene fiber)and two kinds of activators(NaOH and raw stone ash)were tested by four factors and four levels orthogonal test with high strength gypsum,fly ash and slag as basic materials.The hydration reaction mechanism and failure mechanism of four groups of composite wallboard materials with different mix proportion were analyzed.The results show that the activators had a certain influence on the compressive strength of composite wallboard,ramie fiber has a significant effect on the flexural strength of composite wall panel.The optimum mass ratio of ramie fiber,polypropylene fiber,NaOH and quicklime was 1.5%,1.0%,0.3%and 10%respectively.In the alkaline reaction environment created by the activator,the hydration reaction of wall cementitious materials was accelerated,and the crystal of cementitious materials was formed rapidly.Ramie fiber played an important role in crack resistance when the specimen was bent,and polypropylene fiber with high tensile strength played an important role in crack resistance after ramie fiber breaks in the specimen.
作者
刘元珍
宋子阳
李晓东
LIU Yuanzhen;SONG Ziyang;LI Xiaodong(Urban Construction Design Institute of Lanzhou,Lanzhou 730030,China;College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《新型建筑材料》
北大核心
2020年第12期75-80,共6页
New Building Materials
基金
国家自然科学基金项目(51968043)。
关键词
混杂纤维
复合墙板
碱性激发剂
正交试验
延性破坏
hybrid fiber
composite wallboard
alkali activator
orthogonal test
ductile failure
