Water resistance of structured sand-sodium-silicate mixtures

Purpose. To establish regularities of changes in sand-sodium-silicate mixtures (SSSM) relative water resistance, structured by steam-microwave solidification method (SMS), on their structuring parameters and sodium silicate solute (SSS) dissolution conditions. Methodology. Technical purity water, SSS with 2.83.0 modulus, quartz sand 0.23 mm average particle size were used this work. Studies carried out samples, which preliminarily cladded 0.52.5% (by weight) SMS method. The fracture time was evaluated cubic specimens 20 rib length, immersed at different temperatures. Findings. Changes SSSM resistance depending manufacturing, use storage conditions established. Recommendations for rods removal from castings developed. Originality. For the first time, it has been established that decreases along increase temperature is destroyed. Depending mass cladding range 0.52.5%, dependence treatment environment 27 minutes running acquires an inversion character point `3.1 into processing. discovered boiling SSSM, SMS-process having preheating, monotonically increases preheating rising 100 to 600 , sharply when heated 600700 practically becomes absolute after higher Practical value. Research results will be useful concepts processes accompanying destruction sands water-soluble binders expanding, as well technologies equipment development designed mold rests removing castings.