Abstract
To reveal the impact of various sizes of inert reinforcement on the pore structure, hydration products, and microscopic morphology of mortar. To explore its effect on mortar's thermal conductivity. Investigated by microscopic tests and small sample regression modeling. It is found that nanoscale materials have a nanocore effect, which can effectively enhance hydration, but the filling and bridging of larger pores is inadequate, leading to lower thermal conductivity in the early stage. The release of their properties is limited by the dispersion technique. Micron-reinforcing-phase, easily dispersed and with adsorption, can effectively fill capillary pores, and adsorb the hydration products to advance the hydration process. Milli-reinforcing-phase, flocculent fiber water absorption is obvious, resulting in the reduction of the real water-cement ratio, hydration process is delayed. With age growth and water precipitation, the fiber surface produces nucleation sites, which will accelerate the hydration rate. For thermal conductivity, porosity is the main influence factor in the early curing stage; when the porosity changes are small, the internal microstructure and hydration products will become the dominant factors. The sample set is expanded by feature enhancement and data synthesis to improve the generalization ability. The predicted model R2 can reach 0.75, demonstrating that a limited sample of experimental data can make reliable predictions.
Published Version
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