不同配合比模压成型木纤维增强水泥板力学性能的研究  

Mechanical properties of mold pressed fiber reinforced cement board of different mix ratio

作　　者：李启宏[1] 赵金平 张君[1] 俞建华[3] 

机构地区：[1]清华大学土木工程系,北京100084 [2]北新集团建材股份有限公司,北京100096 [3]清华大学材料科学与工程系,北京100084

出　　处：《新型建筑材料》2010年第4期24-28,46,共6页New Building Materials

基　　金：十一五"国家科技支撑计划项目(2006BAJ02B03)

摘　　要：研究了不同木纤维掺量及掺加细石英砂、粉煤灰、PP纤维、木粉、云母片、膨胀珍珠岩后对模压成型水泥板材力学性能的影响,同时探讨了压蒸养护与标准养护下不同龄期的力学性能差异。结果表明,掺加木纤维后板材的延性有所改善,强度则随着纤维掺量的增加而降低;板材强度随着石英砂和粉煤灰掺量增加而降低;PP纤维具有一定的增韧效果;掺加木粉会降低板材强度且没有增韧效果;云母片对板材的韧性和强度影响不大,而使板材密度增加较大;膨胀珍珠岩在适当掺量下对板材强度影响不大,但可以降低密度;压蒸养护下板材的强度有较大的改善。Wood fiber and fine silica sand,fly ash,polypropylene（PP） fiber,wood powder, mica, expanded pearlite were used to investigate the mechanical properties of the mold pressed fiber reinforced cement board. The difference of the mechanical proper- ties of boards under heating curing condition and standard curing condition was also studied. It is found that the wood fiber can improve the ductility of the board while the strength of the board deceases with increase of the wood fiber content. The strength of the board decreases with increase of the silica sand and fly ash content. PP fiber can improve the ductility of the board. The wood powder decreased the strength and had no effect on the ductility of the board. Mica had little effect on the ductility and strength of the board but could increase the density,while proper content of expanded pearlite had little influence on the strength but could decrease the density. Heat curing can significantly improve the strength of the board.

关 键 词：模压成型 木纤维 水泥板 力学性能 

分 类 号：TU525.2[建筑科学—建筑技术科学]