METHOD OF MANUFACTURING CAST-IN-SITU REINFORCED CONCRETE AND CONCRETE STRUCTURES Russian patent published in 2001 - IPC

FIELD: construction industry; applicable in manufacture of reinforced concrete and concrete cast-in-situ structures in accelerated erection of buildings under complicated climatic conditions. SUBSTANCE: method includes measurement of temperature of heating, holding and cooling with the help of temperature sensitive elements located in concrete with subsequent processing of obtained measurements. Novelty consists in that temperature measurements are accomplished by sensitive elements in the form of industrial microcircuits of LM45 type and registration instrument in control points by cycles with measuring in each cycle of ambient temperature neat the structure. Obtained measurement data are processed by entering them into electronic temperature sheet with indication of time of measurements and computer analysis of indications of temperature sheet by criterion in the form of attained strength values of concrete, concrete temperatures at its holding, maximum rates of heating/cooling, maximum temperature drop. Then concrete strength is evaluated and decision is taken on sufficiency of heating and holding of concrete by level of concrete strength and real temperature drop of concrete and outdoor air allowing freeing of structure from forms. In erection of columns, temperature is measured every two hours, rate of heating/cooling of concrete is taken within 10 C/h, level of concrete strength of at least 50% of its designed, and real temperature drop of concrete and outdoor air is 30 C allowing freeing of columns from forms. EFFECT: higher efficiency due to manufacture of cast-in-situ reinforced concrete structures with high strength and short terms of their erection directly at construction sites at low ambient temperatures. 1 cl, 5 dwg