Research of Heat Resistance and Thermal Stability of Concrete on Porous Fillers and Fillers from Dense Rocks

Bondarowich A., Batyanowski E.

ABSTRACT

Material of article reflects results of a research heat- and thermalstability of repair and recovery compositions of concrete for the site of cooling of metal castings in production of receiving was become at the Belarusian steel works in. Zhlobin. In use concrete, the designs protecting this site, is exposed both to heating to 300 ˚С, and to the cooling water influence – in a liquid phase and in the form of sharp superheated steam. In this regard it was necessary to estimate and provide thermal stability of concrete, i. e., ability to resist cyclic heating to «working» temperature and sharp liquid cooling.

Researches were conducted on various compositions of concrete, with use of porous fillers and fillers from dense rocks, chemical additives and a metal fiber.

Results of a complex of researches are reflected in article, including:
–– the analysis of methods of assessment heat-and thermalstability of concrete and requirements to materials for preparation of heat-resistant concrete and also a condition of their application at which he with guarantee can perform the functions during design terms of operation of designs and constructions;
–– results of pilot studies on development and assessment of compositions of concrete and also kinetics of changes of density and durability on compression at a research of its thermal stability.

By results of the conducted researches it is established that the offered compositions of concrete have provided the heat resistance of the class “I 3”i.e., provide heat resistance not less than 300 °C.

Considering existence and availability in Republic of Belarus of crushed stone granite and sand keramzite, the main recommended structure has defined the «facilitated» concrete on the specified fillers.

It is revealed that the brand on thermal stability of heavy constructional concrete on basalt fillers, has appeared less than on other studied structures in which keramzite sand, including concrete with granite crushed stone (the facilitated structure) was applied. At the same time the indicator of thermal stability has exceeded most normalized brand in accordance with GOST 20910 – «T40», more than by 6 times that creates prerequisites of his operational reliability.

Keywords: heat resistance, thermal stability, porous fillers, fillers from dense rocks, application, physics and technology properties.

For citation: Bondarowich A., Batyanowski E. Research of Heat Resistance and Thermal Stability of Concrete on Porous Fillers and Fillers from Dense Rocks. In: Contemporary Issues of Concrete and Reinforced Concrete: Collected Research Papers. Minsk. Institute BelNIIS. Vol. 9. 2017. pp. 113–128. https://doi.org/10.23746/2017-9-8

Full text in Russian:



References:
  1.  Galuzo G. S. Issledovanie prochnosti i defomativnosti agloporitobetona pri deystvii staticheskoy i mnogokratno povtoryayushcheysya szhimayushchikh nagruzok [Research of durability and deformation of an agloporitobeton at action of the static and repeatedly repeating squeezing loadings]. Avtoref. diss. kand. tekhnich. nauk. Minsk, 1969. 25 p. (rus)
  2. Betony zharostykie. Tekhnicheskie usloviya [Heat-resistant concrete. Tekhichesky conditions] : GOST 20910-60. Vved. 12.10.99. Moscow: NIIZHB Gosstroya SSSR, 1990. 26 p. (rus)
  3. Kovshar S. N. Izmenenue strukturno-mekhanicheskikh kharakteristik tsementnogo kamnya pri tsiklicheskom vozdeystvii vneshney sredy [Change of structural and mechanical characteristics of a cement stone at cyclic influence of the external environment]. Stroitelnaya nauka i tekhnika. 2010. No. 1-2 (28-29). pp. 60-63. (rus)


ISSN 2076-6033

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