水化硅酸钙粉体对水泥水化反应过程及机理的影响.pdf

半知第18卷第2期
建筑材料学报
Vol. 18, No. 2
2015年4月
JOURNAL OF BUILDING MATERIALS
Apr.,2015
文章編号:1007-9629(2015)02-0195-07
水化硅酸钙粉体对水泥水化反应过程及机理的影响
彭小芹1,兰聪1,王淑萍,眭世玉2,曾路
1.重庆大学材料科学与工程学院,重庆400045;2.东南大学材料科学与工程学院,江苏南京210096)
摘要:将水化硅酸钙(C-S-HI)粉体掺入水泥浆中,研究其对水泥水化动力学和反应机理的影响,利
用 TAM air微量热仪,测量了掺入C-S-H粉体后水泥的水化速率和水化热;采用透过高度法测试
了C-SH粉体的接触角;运用水化动力学分析方法,确定了掺CS-H粉体后水泥水化反应速率常
数K,水化度a,反应级数n等动力学参数;并根据动力学微分曲缄评价了C-S-H粉体对水泥水化
机理和水化过程的彩响.结果表明:CS-H粉体能降低水泥的水化热总量和成核势垒,并使其水化
放热峰提前;C-S-H粉体在水泥水化反应过程中主要起晶种作用;在一定C-S-H粉体掺量(质量分
数)范国(1%~3%)内,水泥水化过程符合结晶成核与晶体生长(NG过程)一相边界反应(I过程)
扩散(D过程)的水化机理,C-SH粉体促进了NG过程,对I过程有一定的削弱作用,而对D过程
形响很小
关键词:C-S-H粉体;晶种;携触角;水泥水化动力学
中图分类号:TQ172.11文献标志码:A
doi:10.3969/j.issn.1007-9629.2015.02.003
Effects of the C-S-H Powder on the Hydration
Process and Mechanism of Cement
PENG Xiaogin LAN Cong, WANG Shaping SUI Shiyu", ZENG Lu
(1. College of Materials Science and Engineering, Chongging University, Chongqing 400045, China
2. School of Materials Science and Engineering, Southeast University, Nanjing 210096, China)
Abstract Addition of the calcium silicate hydrate(c-s-h) powder to cement paste was aimed to investigate
its influence on the cement hydration kinetics and mechanism. Hydration rate and hydration heat were
measured by TAM air calorimetry. The contact-angle of the C-S-H powder was evaluated by the permea
ting height; kinetic parameters, such as reaction rate(K), hydration degree(a), and reaction order(n)
were evaluated according to the analysis of the hydration kinetics. Additionally, the influence of the C-S-H
powder on hydration mechanism of cement was discussed according to the differential curve. Results indi
cate that the time to reach the rate peak and the total heat of cement hydration decrease with the addition
of C-S-H powder, and nucleation barrier is reduced as well, which is attributed to the seeding effect of the
C-S-H additives by providing new nucleation sites. Given a certain amount of C-S-H(1% to 3% by mass)
hydration mechanism is described as nucleation and crystal growth(NG)-interaction at phase boundaries
(I)-diffusion(D). Addition of C-S-H powder can accelerate the NG process, and has inhibition effect on
the I process. It has no influence on the D process.
Key words: C-SH powder; seeding; contact-angley cement hydration kinetics
收稿日期:2013-09-13;修订日期:2014-01-01
基金项目:国家自然科学基金资助项目(50972171);科技部国际合作项目(2009DFR50450);重庆大学大型仪器开放基金资助项目
(2013121513)
第一作者:彭小芹(1956-),女,四川岳池人,重庆大学教授,博土生导师,博士.E- mail: pxq1ccqu,edu,cn