Influence of Kaolinite Clay on the Chloride Diffusion Property of Cement-Based Materials

摘要: Abstract To constitute blended cement concrete with high chloride diffusion resistivity, the effects of kaolinite clay on mechanical properties and diffusivity paste, mortar were investigated. Ordinary Portland was partially replaced by at 0%, 1%, 3%, 5%, 7% 9% weight cement. All cement-based samples prepared using a w/c ratio 0.5. The microstructure, workability, early-age long-term flexural strength pastes tested. mortars measured. And compressive Mercury Intrusion Porosimetry (MIP) employed to evaluate porosity characteristics. Scanning Electron Microscopy (SEM) Energy Dispersive Spectra (EDS) applied investigate micro morphology chemical element distribution inside matrix, rapid migration (RCM) method test diffusivity. MIP results show that addition improves micro-pore structure in paste limits introduction ions. SEM imaging suggests is acting as both filler accelerator hydration. It found alters water requirement normal consistency setting time cement, whereas it has little influence soundness. Compared control, 1% increased 30.41%, 39.04%, 36.27% 38.32% 1, 3, 7 90 days, respectively. 28-day only slightly. observed lower coefficient values compared plain mortar, ion ( D Cl - ) decreased 53.03% 5% clay. increase 12%, 13.5%, 28.4% control 3% addition, decreases exponentially addition. reduction 8.68% 18.87% clay, increases linearly concrete.