Rheological Properties of Alkali Activated Fly Ash Slag Cementitious Materials
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摘要:
这是一篇陶瓷及复合材料领域的论文。为了研究碱激发粉煤灰矿渣胶凝体系在早期的流变特性，制备了不同粉煤灰和矿粉质量比以及碱激发剂含量的复合浆体，并且分别采用了微型坍落度筒和Brookfield DV3T 流变仪测试其流动性和流变性，最后用等温量热仪测试了各组配比下浆体的水化放热速率。结果表明：当FA/GGBS比为3∶7时，碱激发剂NaOH含量为4%的浆体在所有配合比中流动度为较低。随着粉煤灰质量比和NaOH摩尔质量的升高，碱激发粉煤灰矿渣胶凝体系的流动度均有所上升，且屈服应力和塑性黏度有所下降。粉煤灰掺量的升高使得早期水化速率有所下降，而碱激发剂含量的增加则提高了水化放热峰值速率。
Abstract:This is an article in the field of ceramics and composites. In order to study the early rheological properties of alkali-activated fly ash-slag cementitious system, the composite pastes with different mass ratios of fly ash (FA) to slag (GGBS) and alkaline activator content were prepared. The fluidity and rheological properties of the pastes were tested by mini-cone slump cone, Brookfield DV3T rheometer,respectively. Finally, the hydration exothermic rate of composite pastes with each ratio was tested by isothermal calorimeter. Results show that when FA/GGBS ratio is 3∶7, the fluidity of paste with 4% NaOH content is the lowest. With the increase of FA mass ratio and NaOH molar mass, the fluidity of alkali-activated FA-GGBS cementitious system increased, and the yield stress and plastic viscosity decreased. The growth of FA content decreases the early hydration rate significantly, while the increase of alkali activator content remarkably increases the peak rate of hydration heat release.
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表 1 粉煤灰和矿粉的化学组成/%
Table 1. Chemical compositions of fly ash and slag
SiO2 Al2O3 CaO Fe2O3 MgO SO3 Na2O 粉煤灰 51.65 30.94 5.13 5.64 0.59 0.61 0.52 矿渣 31.54 14.68 41.16 1.19 5.91 2.16 0.43 
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表 2 碱激发材料的配合比
Table 2. Mixture proportions of alkali-activated materials
序号 FA
含量/%GGBS
含量/%Water to
FA-GGBS
碱激发剂
含量 /%碱激
发剂
浓度/
(mol/L)1 30 70 0.5 4 2 2 50 50 0.5 4 2 3 70 30 0.5 4 2 4 30 70 0.5 8 4 5 50 50 0.5 8 4 6 70 30 0.5 8 4
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