养护制度对富硅铁尾矿粉的活性及其浆体结构的影响  

Influence of Curing System on the Activity of Silica-rich Iron Tailings and the Pore Structure of Iron Tailings-cement

作　　者：李北星[1] 陈梦义[1] 王威[1] 朱志刚[1] 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《武汉理工大学学报》2013年第8期1-5,共5页Journal of Wuhan University of Technology

基　　金：国家高技术研究发展计划("863"计划)(2012AA062405)

摘　　要：研究了富硅铁尾矿粉的细度和养护制度对铁尾矿活性及其水泥胶砂强度的影响,并通过X射线衍射(XRD)、扫描电镜(SEM)及压汞仪测试了铁尾矿水泥浆体在不同养护制度下的水化产物及孔结构分布。结果表明:铁尾矿粉磨至一定细度后其活性具有随细度增长变化不明显的特性;标准养护、90℃热水养护及200℃高温干热养护下,富硅铁尾矿粉的活性较低,主要起物理填充作用;蒸压养护激发了富硅铁尾矿粉的火山灰活性而形成大量C-S-H凝胶。90℃热水养护及200℃高温干热养护可降低铁尾矿水泥浆体中有害孔的数量,但增加浆体的孔隙率,而蒸压养护可细化浆体的孔径并显著降低孔隙率。The influence of silica-rich iron tailings powders fineness and curing system on iron tailings activity and its cement mortar strength was studied. And the hydration products of iron tailings cement paste together with its pore structure under different curing system was tested by XRD, SEM and mercury porosimetry. The results show that the ac- tivity of iron tailings changes unobviously after reaching a certain fineness; Iron tailings with lower activity primarily have physical filling effect under standard curing, 90 ℃ hot water conservation and 200 ℃dry heat conservation~ Autoclave cu- ring can greatly stimulate the activity of iron tailings and the main hydration product is C-S-H gel. 90 ℃ hot water con- servation and 200 ℃ dry heat conservation are able to decrease the number of harmful holes in iron railings cement harden- ed paste but can increase the porosity of paste. Autoclave curing can refine slurry aperture and significantly reduce its po- roslty.

关 键 词：富硅铁尾矿 养护制度 火山灰活性 水化 孔结构 

分 类 号：O610.30[理学—无机化学]