粉煤灰水泥浆体孔溶液中K^+、Na^+和OH^-离子的表征  

Characterization of Na^+,K^+ and OH^- ions in the pore solutions of cement pastes with fly ashes

作　　者：张建亮[1] 邓敏[1] 

机构地区：[1]南京工业大学材料科学与工程学院材料化学工程国家重点实验室,江苏南京210009

出　　处：《混凝土》2010年第11期5-9,共5页Concrete

基　　金：国家重点基础研究发展计划(2009CB623105)

摘　　要：采用挤压法提取了水泥浆体的孔溶液,利用火焰光度计和pH计分别检测了孔溶液中Na+、K+和OH-离子的浓度。利用电子天平测定了不同养护环境下水泥浆体的质量变化率。对水泥水化试样做了SEM和DSC-TG分析。分析表明,孔溶液中OH-浓度的高低是由K+和Na+离子的浓度决定的,Na+、K+和OH-离子起到了火山灰活性激发剂的作用,且K+离子的浓度的变化程度较Na+的大。在水化早期,水养护粉煤灰水泥浆体孔溶液的Na+、K+和OH-离子浓度的降幅较硅酸盐水泥浆体的大。The extrusion method was used for getting pore solutions of cement pastes.Flame photometer and pH meter was used to detect the concentrations of Na＋,K＋ and OH-ions in the pore solutions.Electronic Balance was used to measure the weight variation rate of cement paste blocks in two different curing conditions.And the analysis of SEM and DSC-TG of the hydrated cement pastes was made.Results showed that the level of concentration of OH-ion is determined by the level of the concentration of K＋ and Na＋ ions,the Na＋,K＋ and OH-ions in the pore solutions has played a role of active agent for the fly ash,but the changing extent of the concentration of K＋ ion is more significant than Na＋ ion.The reducing extent of Na＋,K＋ and OH-in pore solutions of cement pastes with fly ashes at early age is greater than the Portland cement paste when it was cured in water.

关 键 词：粉煤灰 孔溶液 PH 质量变化率 

分 类 号：TU528.01[建筑科学—建筑技术科学]