Close Packing Theory of Binary System of Fly Ash-Cement with Different Fineness
DOI:
https://doi.org/10.54097/xwq50k46Keywords:
Fly ash, cement, compacted solid void ratioAbstract
The high packing density of particle mixtures is an important factor in achieving ultra-high performance in cement-based composites. In this study, the effect of fly ash with different fineness on the dense packing performance of cement-based composite cementitious material mixing systems are investigated. The results found out that when the particle size of fly ash is significantly smaller than that of cement particles (such as D50=1.0μm, 3.0μm), it can effectively fill the voids between cement particles and reduce the void ratio; when the particle size is similar to that of cement (such as D50=12.0μm), there is no filling effect, and even the packing effect may be deteriorated. At the same time, the smaller the particle size, the better the filling effect. In specific, at the optimal dosage, fly ash with D50=1.0μm can achieve a lower porosity than fly ash with D50=3.0μm, and the overall effect of reducing porosity is more significant.
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