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材料导报  2020, Vol. 34 Issue (6): 6066-6074    https://doi.org/10.11896/cldb.19030122
  无机非金属及其复合材料 |
无水乙酸钠对磷酸钾镁水泥水化性能和微观形貌的影响
戴俊1,2, 钱春香1,2, 陈竞3, 庞忠华3
1 东南大学材料科学与工程学院,南京 211189;
2 东南大学绿色建材研究中心,南京 211189;
3 柳州欧维姆机械股份有限公司,柳州 545000
Effect of Sodium Acetate Anhydrous on Hydration and Microstructure of Potassium Magnesium Phosphate Cement
DAI Jun1,2, QIAN Chunxiang1,2, CHEN Jing3, PANG Zhonghua3
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China;
2 Research Center of Green Building and Construction Materials, Southeast University, Nanjing 211189, China;
3 Liuzhou OVM Machinery Co., Ltd., Liuzhou 545000, China
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摘要 磷酸钾镁水泥(MKPC)快速凝结硬化和集中大量放热的特点制约了其实际应用。传统的缓凝剂难以显著降低其水化硬化速率且无法平衡缓凝剂对凝结时间和力学性能的影响。采用无水乙酸钠(SA)作为新型缓凝剂,研究了其对MKPC水化放热特性、工作性能和抗压强度的影响,并采用XRD、TG-DSC及SEM等分析了SA对MKPC水化硬化过程中固相组成和形貌的影响及机理。结果表明,SA吸附在氧化镁表面能够抑制Mg2+的溶解,延缓氧化镁和磷酸二氢钾的水化反应速率,降低水化温度。因此,随着SA掺量的增加,MKPC的凝结时间得到有效延长,而MKPC的强度尤其是早期强度则随之下降。SA掺入后,MKPC仍以MgKPO4·6H2O为主要水化产物,但产物数量减少,棱柱状或板状晶体被球状晶体取代,晶体尺寸减小。
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戴俊
钱春香
陈竞
庞忠华
关键词:  磷酸钾镁水泥  放热特性  水化速率  水化产物  微观形貌  吸附    
Abstract: The practical applications of potassium potassium phosphate cement (MKPC) are restricted by its rapid setting and hardening and concentrative hydration heat. It is difficult for the conventional retarders to significantly reduce the hydration rate and balance the effects of retarders on setting time and mechanical properties. Effects of sodium acetate anhydrous (SA) on hydration heat release characteristics, working perfor-mance and compressive strength were investigated. Moreover, effects of SA on solid phase components and morphology of hydration products and its mechanism were analyzed by XRD, TG-DSC and SEM. The results indicated that SA inhibited the dissolution of Mg2+ by adsorbing on the surface of MgO. It delayed the hydration rate of MgO and KH2PO4, and lowered the hydration temperature. Thus, as the content of SA increased, the setting time of MKPC was effectively prolonged, while the strength, especially the early strength, decreased. The main hydration products of MKPC with SA were MgKPO4·6H2O, but the quantity of products was reduced. With the increasing content of SA, prismatic or plate crystals were replaced by spherical crystals, and crystal grain size reduced.
Key words:  potassium magnesium phosphate cement    exothermic properties    hydration rate    hydration products    micro-morphology    adsorption
                    发布日期:  2020-03-12
ZTFLH:  TB331  
基金资助: 东大-欧维姆预应力工程技术联合研究中心
作者简介:  戴俊,自2016年9月就读于东南大学材料科学与工程专业,主要从事磷酸钾镁水泥缓凝剂及其砂浆的研究;钱春香,东南大学教授、东南大学绿色建材研究所所长,主要从事高性能混凝土与微生物智能混凝土、微生物水泥与其它低碳胶凝材料、绿色节能建筑材料的研究。
引用本文:    
戴俊, 钱春香, 陈竞, 庞忠华. 无水乙酸钠对磷酸钾镁水泥水化性能和微观形貌的影响[J]. 材料导报, 2020, 34(6): 6066-6074.
DAI Jun, QIAN Chunxiang, CHEN Jing, PANG Zhonghua. Effect of Sodium Acetate Anhydrous on Hydration and Microstructure of Potassium Magnesium Phosphate Cement. Materials Reports, 2020, 34(6): 6066-6074.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.19030122  或          http://www.mater-rep.com/CN/Y2020/V34/I6/6066
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