高铝水泥对脱硫建筑石膏的改性研究

发布时间：2018-02-12 10:09

本文关键词： 脱硫石膏改性高铝水泥钙矾石　出处：《新型建筑材料》2017年01期 　论文类型：期刊论文

【摘要】：研究了高铝水泥对脱硫建筑石膏的标准稠度用水量、凝结时间及力学性能的影响,并结合复合胶凝材料的微观结构进行了机理分析。试验结果表明:高铝水泥的添加减小了脱硫建筑石膏的标准稠度用水量,延长了凝结时间,并且提高了试件的力学性能和耐水性。当掺量为20%时,试件的28 d抗折、抗压强度分别为6.03、11.05 MPa,比纯石膏提高了99.67%和80.56%,软化系数达0.70,比纯石膏提高了59.09%。通过微观表征可知,掺入高铝水泥后,石膏晶体表面生成了强度高且不溶于水的C-S-H凝胶和钙矾石,这是高铝水泥能提高脱硫建筑石膏力学强度和耐水性的原因。
[Abstract]:The effects of high aluminum cement on the standard consistency water consumption, setting time and mechanical properties of desulphurized building gypsum were studied. The experimental results show that the addition of high aluminum cement reduces the standard consistency water consumption of desulphurized building gypsum and prolongs the setting time. The mechanical properties and water resistance of the specimens were also improved. When the content of 20% was 20, the specimens' flexural strength and compressive strength were 6.03 ~ 11.05 MPa, 99.67% and 80.56 respectively, and the softening coefficient was 0.70 and 59.09% higher than that of pure gypsum. When high alumina cement is added, C-S-H gel and ettringite with high strength and insoluble water are formed on the surface of gypsum crystal, which is the reason why high aluminum cement can improve the mechanical strength and water resistance of desulfurized building gypsum.
【作者单位】：河海大学力学与材料学院;盐城工学院材料学院;
【基金】：江苏省科技厅社会基金项目(BE2015659) 江苏省墙改办资助项目(苏经信2014-651-8) 江苏省生态建材与环保装备协同创新中心项目(C P201506)
【分类号】：TQ177.377;TQ172.1

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