The influence of the chemical and physical properties of C-S-H seeds on their potential to accelerate cement hydration
The influence of the chemical and physical properties of C-S-H seeds on their potential to accelerate cement hydration
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DOI：
10.1016/j.conbuildmat.2019.116723
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发表时间：
2019-12-20
影响因子：
7.4
通讯作者：
Stephan, Dietmar
中科院分区：
文献类型：
--
作者：
John, Elisabeth;Epping, Jan Dirk;Stephan, Dietmar
绿色水泥的发展和减少混凝土中水泥含量以减少二氧化碳排放，往往会导致水化活性和强度的降低，特别是在早期阶段，这与经济利益和工艺要求相冲突。除了纳米二氧化硅等火山灰外，水化硅酸钙纳米颗粒(C-S-H)由于其突出的加速水泥水化的能力而不影响播种水泥的长期强度，最近已成为研究的焦点。已发现许多C-S-H性质影响其加速性能，关于钙硅比的结果存在争议。而Alizadeh等人。发现当使用硅含量较高的C-S-H晶种时，C3S的水化速度更快。研究发现，钙含量较高的种子是更好的促进剂。在C-S-H的稳定范围内，采用化学计量学方法，系统地考察了C-S-H的化学和物理性质对其性能的影响。以等温热流量热法作为筛选方法，考察了其对水泥水化的影响。(C)2019爱思唯尔有限公司。保留所有权利。
The development of green cements and reduced cement contents in concrete for reducing CO2 emissions, often results in reduced hydration activity and strength, especially in early stages, which conflicts with economic interests and process requirements.Besides pozzolans like nano-silica, the performance of calcium silicate hydrate (C-S-H) nanoparticles has recently become a focus of research, due to their outstanding ability to accelerate cement hydration, without compromising the long-term strength of the seeded cement. Many C-S-H properties have been found to influence their accelerating performance, with controversial results having been published regarding the calcium to silicon ratio. While Alizadeh et al. have found that the hydration of C3S is accelerated more when C-S-H seeds richer in silicon are applied, Land et al. have found that seeds richer in calcium are better accelerators. Neither particle size nor respective surface area were kept constant in either work.Using stoichiometry within the stability range of C-S-H, this work aims towards a systematic investigation of the influence of the chemical and physical properties of C-S-H. The impact on cement hydration is examined using isothermal heat flow calorimetry as a screening method. (C) 2019 Elsevier Ltd. All rights reserved.