Effects of activator characteristics on the reaction product formation in slag binders activated using alkali silicate powder and NaOH
Effects of activator characteristics on the reaction product formation in slag binders activated using alkali silicate powder and NaOH
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DOI：
10.1016/j.cemconcomp.2012.03.006
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发表时间：
2012-08
影响因子：
10.5
通讯作者：
D. Ravikumar;N. Neithalath
中科院分区：
文献类型：
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作者：
D. Ravikumar;N. Neithalath
讨论了不同碱度(以Na2O与原料之比(N)和激发剂SiO_2与Na2O之比(Ms)表示)对水玻璃和氢氧化钠矿渣胶凝材料体系抗压强度发展和反应产物形成的影响。较高的n值混合料表现出较高的早期和后期抗压强度。MS的增加会导致早年年龄的减少和晚年强度的略微增加。提出了与活性矿渣粘结剂的早期和后期强度有关的组成系数，它们是n和ms的函数，并与FTIR光谱的位移有关。用FTIR主峰的位移解释了这些体系中反应产物的形成与总碱度的关系。观察到粉末活化粘结剂的反应产物随着碱度的变化而发生基本变化。用水杨酸-甲醇(SAM)攻击前后糊体的FTIR光谱证实了峰位移的推论。
The influence of different levels of alkalinity, expressed using the Na2O-to-source material ratio (n) and activator SiO2-to-Na2O ratio (Ms), on the compressive strength development of, and reaction product formation in sodium silicate and NaOH powder activated slag binder systems is discussed. Higher n value mixtures are found to exhibit higher early and later age compressive strengths. An increase in Msresults in reduced early age and slightly increased later age strengths. Compositional coefficients, which are functions of n and Msare proposed, that relate to the early and later age strengths of the activated slag binders as well as to the shift in the FTIR spectra. The reaction product formation in these systems as a function of the total alkalinity is explained using the shifts of the dominant peak in the FTIR spectra. Fundamental changes in reaction products of powder activated binders as a function of alkalinity is observed. The deductions from the peak shifts are substantiated using the FTIR spectra of the pastes before and after salicylic acid–methanol (SAM) attack.