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新型墙体材料与施工
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混杂纤维高强石膏基复合墙板基本力学性能研究

作者：刘元珍1，宋子阳2，李晓东2

关键字：混杂,纤维,高强,石膏,基,复合,墙板,基本,

　
（1.兰州市城市建设设计院，甘肃 兰州  730030；
2.兰州理工大学 土木工程学院，甘肃 兰州  730050）
    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。
    关键词：混杂纤维；复合墙板；碱性激发剂；正交试验；延性破坏
    中图分类号：TU526         文献标识码：A        文章编号：1001-702X（2020）12-0075-06
 
Study on the basic mechanical properties of hybrid fiber high strength gypsum based composite wallboard
LIU Yuanzhen1，SONG Ziyang2，LI Xiaodong2
（1.Urban Construction Design Institute of Lanzhou，Lanzhou 730030，China；
2.College of Civil Engineering，Lanzhou University of Technology，Lanzhou 730050，China）
    Abstract：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.
    Key words：hybrid fiber，composite wallboard，alkali activator，orthogonal test，ductile failure