摘要
为提高硬硅钙石制品的耐压强度,首先将预处理后的石英粉、消化后的CaO、添加剂、去离子水(按水、固质量比为30量取)置于磁力搅拌高压釜中,在220℃分别保温0、1、3和6h后得到相应产物,探究硬硅钙石的合成;然后,在制得的硬硅钙石粉体中分别加入0、5％、10％、15％和20％(w)的预处理陶瓷短纤维,经压滤成型和烘干后,于1 000℃保温2h烧成,研究陶瓷纤维加入量对硬硅钙石试样烧成前后耐压强度的影响.结果表明:在硬硅钙石的合成过程中,首先生成C-S-H凝胶,然后C-S-H凝胶转化形成托贝莫来石,最终托贝莫来石完全反应生成了硬硅钙石;陶瓷纤维的引入提高了硬硅钙石试样烧成前后的耐压强度,当加入15％(w)陶瓷纤维时,耐压强度最大;1 000℃烧成前后试样中的物相分别是硬硅钙石相和硅酸钙相,烧成后试样的耐压强度比生坯试样的大.
Abstract
In order to improve the compressive strength of xonotlite,the pretreated quartz powder,slakedCaO,additive,deionized water (water:solid ratio of 30) were placed in a magnetically stirred autoclave,and the corresponding products were obtained after incubating at 220 ℃ for 0,1,3 and 6 h,respectively toexplore the synthesizing process of xonotlite.In the prepared xonotlite powder,0,5％,10％,15％ and 20％(by mass,the same hereinafter) of pre-treated ceramic staple fibers were added,specimens were moul-ded by pressed filtration,dried,and fired at 1 000 ℃ for 2 h to explore the effect of ceramic fiber addition onthe compressive strength before and after firing of xonotlite.The results show that C-S-H gel is first synthe-sized in the synthesis of xonotlite,and then the C-S-H gel is transformed to form tobermlite,at last toberm-lite fully reacts to produce xonotlite.The addition of ceramic fiber enhances the compressive strength of thexonotlite before and after sintering.When the 15％ ceramic fiber is added,the compressive strength is thehighest.The specimens before and after the high temperature firing contain xonotlite phase and calcium sil-icate phase,respectively,and the compressive strength of the fired specimens is higher than that of thegreen ones.
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维普
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