使用化学惰性填料评估高掺量粉煤灰混合物的水化情况。
EVALUATING THE HYDRATION OF HIGH VOLUME FLY ASH MIXTURES USING CHEMICALLY INERT FILLERS.
作者信息
la Varga Igor De, Castro Javier, Bentz Dale, Zunino Franco, Weiss W Jason
机构信息
SES Group & Associates LLC, Turner-Fairbank Highway Research Center (of the Federal Highway Administration), 6300 Georgetown Pike, McLean, VA 22101, USA.
Faculty of Engineering, Universidad del Desarrollo, Av. La Plaza 680 Las Condes, Santiago, Chile.
出版信息
Constr Build Mater. 2018 Feb;161. doi: 10.1016/j.conbuildmat.2017.11.132.
Fly ash is frequently used as a replacement for cement in concrete. However, questions remain regarding the influence that fly ash has on the hydration of cement. This paper examines physical aspects (e.g., surface nucleation, cement particle spacing) and chemical aspects (e.g., pozzolanic and hydraulic reactions) of the fly ash and cement in mixtures containing high volumes of fly ash. In addition to using fly ash, a chemically inert filler was used consisting of a blend of fine silica sands with approximately the same particle size distribution as that of the fly ash. The paper compares reactivity results from 1) cement, 2) cement-fly ash and 3) cement-inert filler systems. Isothermal calorimetry measurements are used to quantitively evaluate the role played by the fly ash in hydration of high volume fly ash mixtures. The results provide a decoupling of the physical and chemical effects of high volume fly ash on cement hydration.
粉煤灰常用于替代混凝土中的水泥。然而，关于粉煤灰对水泥水化的影响仍存在疑问。本文研究了高掺量粉煤灰混合物中粉煤灰和水泥的物理方面（如表面成核、水泥颗粒间距）和化学方面（如火山灰反应和水硬性反应）。除了使用粉煤灰外，还使用了一种化学惰性填料，它由细硅砂混合而成，其粒径分布与粉煤灰大致相同。本文比较了1）水泥、2）水泥-粉煤灰和3）水泥-惰性填料体系的反应性结果。采用等温量热法测量来定量评估粉煤灰在高掺量粉煤灰混合物水化过程中所起的作用。结果揭示了高掺量粉煤灰对水泥水化的物理和化学作用的解耦情况。
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