Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thermal Treatment of Huge Precast Components for Saratov Hydroelectric Powerplant Structures (Termoobrabotka Massivnykh Otformovannykh Detalei Zdaniya Saratovskoi Ges)
Prior to inaugurating the assembly-line method of constructing huge precast reinforced concrete components for Saratov Powerplant structures, field and theoretical investigations were made to determine the best method of heat-curing these 60- to 80-cu m components rapidly enough to permit unmolding at 10 to 12% design strength and erection at 60% without reducing quality or slowing up flow of finished products to erection site. Full-size speciments were tested by uniform periphery heating to 50 and 80C and electrode-grid internal heating to 80C. Only internal electroheating, using the conductivity of the mix to raise the temperature of the specimen at the required rate, prevented surface cracking due to cooling strain. Timing and temperatures of electroheating, cooling, and moisture-curing cycles must be rigidly controlled to allow the concrete to attain its full strength and frost resistance. Properties of the concrete in the specimens, variously treated and cured, were determined by testing cores drilled at different ages. Procedures for manufacturing massive components in summer and winter, the way of installing the electrode grids, and the tests leading to the recommendations are described. (Author)
Thermal Treatment of Huge Precast Components for Saratov Hydroelectric Powerplant Structures (Termoobrabotka Massivnykh Otformovannykh Detalei Zdaniya Saratovskoi Ges)
Prior to inaugurating the assembly-line method of constructing huge precast reinforced concrete components for Saratov Powerplant structures, field and theoretical investigations were made to determine the best method of heat-curing these 60- to 80-cu m components rapidly enough to permit unmolding at 10 to 12% design strength and erection at 60% without reducing quality or slowing up flow of finished products to erection site. Full-size speciments were tested by uniform periphery heating to 50 and 80C and electrode-grid internal heating to 80C. Only internal electroheating, using the conductivity of the mix to raise the temperature of the specimen at the required rate, prevented surface cracking due to cooling strain. Timing and temperatures of electroheating, cooling, and moisture-curing cycles must be rigidly controlled to allow the concrete to attain its full strength and frost resistance. Properties of the concrete in the specimens, variously treated and cured, were determined by testing cores drilled at different ages. Procedures for manufacturing massive components in summer and winter, the way of installing the electrode grids, and the tests leading to the recommendations are described. (Author)
Thermal Treatment of Huge Precast Components for Saratov Hydroelectric Powerplant Structures (Termoobrabotka Massivnykh Otformovannykh Detalei Zdaniya Saratovskoi Ges)
N. V. Yudina (Autor:in)
1969
41 pages
Report
Keine Angabe
Englisch
Construction Equipment, Materials, & Supplies , Reinforced concrete , Aging(Materials) , Power plants(Establishments) , Heat treatment , Production control , Concrete , Thermal stresses , Heating elements , Modulus of elasticity , Thermal analysis , Manufacturing methods , USSR , Translations , Precast concrete
Study of joints in precast reinforced-concrete structures of the Saratov Hydroelectric station
| Springer Verlag | 1968
Study of joints in precast reinforced-concrete structures of the Saratov Hydroelectric station
| Online Contents | 1968
Thermal treatment of massive precast units for Saratov powerhouse
| Engineering Index Backfile | 1966