碱活化水泥中碱-硅反应的热力学模拟研究

IF 3.9 3区 工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY
Haoliang Jin, Sam Ghazizadeh, John L. Provis
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引用次数: 0

摘要

基于碱活化材料(AAMs)的砂浆和混凝土中碱-硅反应(ASR)的可能性和后果仍在讨论中,这主要是由于这类水泥具有高碱含量的特点。在本研究中,将热力学模型应用于ASR的研究提供了一个新的视角来了解作为粘合剂化学函数的ASR机制。通过考虑不同的活化剂(NaOH, Na2SO4, Na2CO3, Na2O)。计算了不同剂量下不同模量n的nSiO2在部分反应性硅质聚集体的AAMs中可能形成的滑石型ASR产物的体积。水化后的溶液化学和相组合为解释观察到的趋势提供了进一步的信息。虽然在AAM配方中使用了高浓度的含钠活化剂,但与波特兰水泥相比,Na-shlykovite和K-shlykovite的形成要少得多。随着活化剂用量的增加(对所有被测试的活化剂),形成的钠-水玻璃的体积减小,当使用水玻璃活化剂时,水玻璃的模量减小。水化后的高浓度Ca,而不是孔隙溶液中碱的浓度,是滑石形成的控制因素,在这些模拟中代表ASR。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Investigation of alkali-silica reaction in alkali activated cements by thermodynamic modelling

The likelihood and consequences of the alkali-silica reaction (ASR) in mortars and concretes based on alkali-activated materials (AAMs) are still under discussion, due largely to the characteristically high alkali levels of this class of cements. In this study, applying thermodynamic modelling to the study of ASR provides a new insight into ASR mechanisms as a function of binder chemistry. By considering different activators (NaOH, Na2SO4, Na2CO3, Na2O.nSiO2 with various values of the modulus n) at different dosages, the volume of shlykovite-type ASR products that can potentially form in AAMs with partially reactive siliceous aggregates was calculated. The solution chemistry and phase assemblage after hydration provide further information to aid in explaining the observed trends. Although high concentrations of Na-bearing activators were used in the AAM formulations, much less Na-shlykovite and no K-shlykovite are formed, compared to Portland cement. The volume of Na-shlykovite formed decreases with an increase in the dosage of activators (for all activators tested), and with a decrease in the modulus of sodium silicate when this is the activator used. A high concentration of Ca after hydration, rather than the concentration of alkalis in the pore solution, is the controlling factor in shlykovite formation, which represents ASR in these simulations.

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来源期刊
Materials and Structures
Materials and Structures 工程技术-材料科学:综合
CiteScore
6.40
自引率
7.90%
发文量
222
审稿时长
5.9 months
期刊介绍: Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.
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