Revealing the Enhancement Mechanism of Alkali-Activated Rice Husk Ash on High Mud Content CSG Materials from the Fractal Perspective

Fractal and Fractional, Journal Year: 2025, Volume and Issue: 9(4), P. 209 - 209

Published: March 28, 2025

To address the detrimental effects of high mud content on cemented sand and gravel (CSG) materials, this study focuses CSG materials with different contents alkali-activated rice husk ash (RHA). The microscopic enhancement mechanism mechanical properties RHA were studied through experiments. Based changes in microstructure, pore sizes, mineral composition, microstructural features are quantitatively characterized using characteristic parameters fractal dimensions, revealing by which improves materials. results indicate that effectively enhances As increases, compressive strength elastic modulus initially increase then decrease, while failure strain first decreases increases. mode transitions from splitting to shear failure, optimal performance at 5% content. Microscopic experimental analysis found adding an appropriate amount can promote generation cementitious substances, improve internal structure, dimension. However, excessive adsorb moisture, inhibit part hydration reactions reduce Under action alkali activators, activity is enhanced, generating more significantly improving pore-filling effect within material, especially affecting capillary pores.

Language: Английский

Evaluation of the Efficiency of Alkali-Activated Material Consisting of Rice Husk Ash by Physical and Mechanical Characteristics

Construction Materials, Journal Year: 2025, Volume and Issue: 5(2), P. 21 - 21

Published: April 1, 2025

Reducing the large amounts of carbon dioxide emitted during cement processing is crucial to control adverse effects greenhouse gases. This study provides a promising alternative technology reduce such emissions and investigate physical mechanical characteristics alkali-activated materials with rice husk ash (RHA). To this end, compressive strength, drying shrinkage, water penetration resistance mortar made RHA, blast furnace slag (BFS), alkaline activator (sodium carbonate, NC) are investigated. Two RHA particle sizes 45 150 µm types used, thereby varying replacement ratio 0, 7.5, 15.0 wt.%. Based on adiabatic hydration temperature, Archimedes porosity, pH, ignition loss, scanning electron microscopy, energy-dispersive X-ray spectroscopy diffraction results paste, effect examined. Experimental investigation reveals that strengths sample 15 wt.% BFS were recorded between 48 51 MPa. When was length change 1147 × 10−6 moisture depth less than 11 mm. Notably, significantly improves increasing content; however, at high ratios, particle-size not prominent. Furthermore, decreases porosity but increases loss produces C-S-H gel.

Language: Английский