硫酸铵环境下超细矿渣粉掺量对水泥砂浆性能的影响  

Effect of ultrafine slag powder addition on performance of cement mortar subjected to(NH_4)_2SO_4 solution

作　　者：王学兵[1] 潘志华[1] 沈晓冬[1] 刘伟庆[2] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009 [2]南京工业大学土木工程学院,江苏南京211800

出　　处：《南京工业大学学报（自然科学版）》2017年第6期32-38,共7页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家重点基础研究发展计划(973计划)(2011CB013800);江苏省普通高校研究生科研创新计划(KYLX15_0777)

摘　　要：采用压汞法(MIP)、乙二胺四乙酸(EDTA)化学滴定法及X线衍射(XRD)等检测手段研究掺超细矿渣粉的水泥砂浆在5%(NH_4)_2SO_4溶液中浸泡2 a后的物理和化学变化。结果表明:通过显色反应可以清晰地观察到水泥砂浆中(NH_4)_2SO_4的扩散边界,并发现随着超细矿渣粉掺量的增加,水泥砂浆试块中(NH_4)_2SO_4扩散深度减小,而试块强度增加。通过MIP检测出掺加超细矿渣粉后的水泥砂浆的腐蚀区域的孔隙率明显小于未掺加超细矿渣粉的水泥砂浆。通过化学分析测定了游离Ca^(2+)和SO_3含量,两者含量均随水泥砂浆的深度增加而逐渐降低,并随超细矿渣粉含量的增加而减小。因此,添加超细矿渣粉能有效阻滞(NH_4)_2SO_4的侵蚀。Physical and chemical changes of cement mortar blended with ultrafine slag powder immersed in 5%（NH_4）_2SO_4 solutions for 2 years were investigated by means of mercury intrusion porosimetry（MIP）,elhylene cliamine tetraacetic acid（EDTA） chemical titration and X-ray diffraction（XRD）.Results showed that diffusion boundary of（NH_4）_2SO_4 into mortars could be clearly observed by colorization of barium rhodizonate and the diffusion depths of（NH_4）_2SO_4 into mortars decreased with the increasing of ultrafine slag powder content addition.The addition of ultrafine slag powder also notably reduced the strength of mortars immersed in（NH_4）_2SO_4 solutions.Porosity of mortars within（NH_4）_2SO_4 diffusion region decreased with the addition of ultrafine slag based on MIP determination.Concentrations of Ca^（2＋） and SO_4^（2-） were determinded by chemical analysis,and they all decreased along with the increasing ofdiffusion depth and also with the addition of ultrafine slag powder.It is believed that the addition of ultrafine slag powder into cement mortar could effectively improve the resistance performance against（NH_4）_2SO_4 attack.

关 键 词：硫酸铵 水泥砂浆 超细矿渣粉 性能 

分 类 号：TU528.01[建筑科学—建筑技术科学]