摘要
为探讨硫铝酸盐水泥的适应性问题,采用可溶性金属钠盐将不同浓度的SO2-4、Cl-、OH-、B4O2-7等阴离子分别引入至硫铝酸盐水泥净浆中,具体考察阴离子类型及浓度对净浆流动度、流动度经时损失及凝结时间的影响。结果表明:除Cl-离子之外,其他三种离子均展现出不同程度的缓凝效果,其中以B4O2-7离子的缓凝作用最为显著,而OH-离子则在产生缓凝效应的同时,明显降低了其净浆流动度特别是初始流动度值,形成独特的"不凝不流"现象。上述试验现象的产生,均与相应情况下硫铝酸盐水泥熟料的水化过程有关。
In order to identify the adaptability of sulphoaluminate cement, soluble anions including SO24-, Cl-, OH- or B4 O27- in desired concentration was introduced separately into sulphoaluminate cement slurry, of which the initial fluidity and its loss through 30 minutes, as well as the initial setting time,were investigated in details.The results show that all the anions except Cl- might give rise of a short- ened time of initial setting to a certain extent,in which the greatest effect of setting acceleration was obtained from the slurry prepared with high -concentration B40^- anion in appreciable concentrations.In the meanwhile,it is worthy of pointing out that not only a largely shortened setting time, but also an abnormally reduced fluidity were found due to the presence of OH- anion in high concentration. All the phenomena were reasonably explained according to the alternations of the hydration mechanism of such sulphoaluminate cement.
出处
《混凝土》
CAS
北大核心
2015年第3期90-92,共3页
Concrete
基金
国家十二五科技支撑重点项目(2011BAJ10B04)
