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材料导报  2021, Vol. 35 Issue (10): 10055-10061    https://doi.org/10.11896/cldb.20020138
  无机非金属及其复合材料 |
5 ℃养护下甲酸钙对水泥早期水化的影响
张丰1,2, 白银1,2, 蔡跃波1,2
1 南京水利科学研究院,南京 210029
2 水文水资源与水利工程科学国家重点实验室,南京 210024
Effect of Calcium Formate on Early Hydration of Cement at 5 ℃
ZHANG Feng1,2, BAI Yin1,2, CAI Yuebo1,2
1 Nanjing Hydraulic Research Institute, Nanjing 210029, China
2 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210024, China
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摘要 本工作在5 ℃低温条件下,研究了甲酸钙对砂浆1 d、3 d、7 d、28 d抗压强度的影响规律,并分别从水化放热、水化动力学过程、水化产物等角度,分析了低温下甲酸钙对水泥早期水化的影响。结果表明:甲酸钙具有低温早强作用,可促进5 ℃低温下砂浆早期强度的发展,其强度提高作用时间主要在前3 d,适宜掺量范围为1%~2%。甲酸钙的掺入可促进低温下水泥初期(前7 d)的水化反应,使水泥水化诱导期略有缩短,加速期提前,水化温峰出现时间提前,水化放热速率、放热量均明显增大;掺甲酸钙组分可提高水泥水化结晶成核与晶体生长(NG)、相边界反应(I)和扩散反应(D)各阶段的反应速率,并使相边界反应(I)阶段持续时间延长、水化程度提高。水泥初期(前7 d)水化产物中Ca(OH)2数量增加,但水化产物种类未发生明显变化。
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张丰
白银
蔡跃波
关键词:  甲酸钙  低温  早强  水化热  水化动力学    
Abstract: At 5 ℃ low temperature, the influence law of calcium formate on the mortar strengths at 1 d, 3 d, 7 d and 28 d was studied in this work, and its effect on the early hydration of cement was also analyzed from the perspectives of hydration heat, hydration kinetics and hydration pro-ducts. The results showed that, calcium formate had a low-temperature early-strength effect, which could promote the early strength development of mortar at a low temperature of 5 ℃. And its effect time of strength improvement was mainly before 3 d, and its suitable dosage range was from 1% to 2%. The incorporation of calcium formate could promote the hydration reaction of cement at the initial stage (before 7 d), shorten the hydration induction period of cement slightly, advance the acceleration period, and advance the occurrence time of heat-releasing peak. Furthermore, the hydration heat release rate and cumulative heat release would be all increased significantly. Calcium formate increased all the hydration reaction rates of nucleation and crystal growth (NG)stage, phase boundary reaction (I)stage and diffusion reaction (D)stage, and extended the duration and increased the hydration degree of I stage. The incorporation of calcium formate increased the content of Ca(OH)2 at the initial stage of cement hydration, but the types of hydration products did not change significantly.
Key words:  calcium formate    low temperature    early strength    hydration heat    hydration kinetics
               出版日期:  2021-05-25      发布日期:  2021-06-04
ZTFLH:  TQ172  
基金资助: 国家重点研发计划项目(2018YFC0406702);国家自然科学基金项目(51739008);中央级公益性科研院所基本科研业务费专项(Y419004)
通讯作者:  fzhang@nhri.cn   
作者简介:  张丰,2018年7月毕业于南京水利科学研究院,获得工学博士学位。同年加入南京水利科学研究院材料结构研究所工作至今,主要从事水工新材料及混凝土耐久性的研究。
引用本文:    
张丰, 白银, 蔡跃波. 5 ℃养护下甲酸钙对水泥早期水化的影响[J]. 材料导报, 2021, 35(10): 10055-10061.
ZHANG Feng, BAI Yin, CAI Yuebo. Effect of Calcium Formate on Early Hydration of Cement at 5 ℃. Materials Reports, 2021, 35(10): 10055-10061.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.20020138  或          http://www.mater-rep.com/CN/Y2021/V35/I10/10055
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