METHOD OF AUTOCLAVING ARTICLES FROM FOAMED CONCRETE Russian patent published in 2020 - IPC C04B40/00 C04B38/00 G05D23/00 

FIELD: construction.

SUBSTANCE: invention relates to construction industry, specifically to a method of producing construction materials, and can be used, for example, in production of articles from foamed concrete by autoclave technology. Method includes loading of foamed concrete into autoclave, setting the pressure change program in the autoclave during successive performance of the blowdown process, evacuation, pressure boost, maintenance, pressure release, pressure measurement P_aut and temperature T_aut, automatic control of pressure in autoclave in accordance with the program, unloading articles from autoclave. In this case the autoclave is further provided with an automatic control system comprising a setting unit temperature value T_tb start formation of tobermorite, temperature comparison unit T_aut with T_tb, unit for measuring steam flow rate g_sb through steam bypass line, unit for calculating steam flow derivative dg_sb/dt, unit for calculating time τ₂, in which derivative of steam flow rate dg_sb/dt changes sign, time calculation unit τ₃ end of curing phase. Temperature value T_tb of beginning of tobermorite formation is specified. Moment of time τ₁ is fixed, at which temperature T_aut in the autoclave reaches the value T_tb. Flow rate g_sb of steam is measured starting from moment τ₁ through steam bypass line. Derivative of steam flow rate dg_sb/dt is calculated by time and time τ₂ is determined, at which the steam flow rate derivative dt changes its sign. Time τ₂=2τ₂-τ₁ of the end of curing phase is determined. Value τ₃ is introduced in the form of correction into the pressure setting unit P_s(t) in the autoclave as the moment of the beginning of the pressure release stage.

EFFECT: increased efficiency of autoclave, reduced power inputs for production of articles from foamed concrete and stabilization of finished products strength.

1 cl, 3 dwg