RU2201410C2 - Concrete - Google Patents

Abstract

FIELD: manufacture of building materials. SUBSTANCE: invention provides concrete including cement stone-bound coarse granulated and fine fillers, said coarse filler containing granulate fraction 5-20 mm fabricated from disperse disposal plant ash-slag waste, mechanically activated cement, and additives. EFFECT: utilized high-toxicity disposal plant waste and extended resource of inexpensive concrete fillers. 2 tbl

Description

 The invention relates to the construction, mainly to the production of concrete.

 Concrete is known, including hardened cement stone with large and small aggregates placed throughout the stone volume (see, for example, Yu. M. Bazhenov's book “Concrete Technology”, Moscow, Higher School, 1978, p.5).

 The closest in technical essence to the present invention is concrete, including large and small aggregates bonded with cement stone, and known concrete contains artificial granular aggregate as a large aggregate (see, for example, the book by V. G. Dovzhik and others. "Structural and heat-insulating expanded clay concrete in large-panel housing construction ", Moscow, 1964).

 The purpose of the invention is the disposal of highly toxic waste incinerators, expanding the base of cheap aggregates for concrete.

 This goal is achieved in that concrete, including large granular and fine aggregates bonded with cement stone, contains granules of 5-20 mm fractions made from dispersed ash and slag waste from incinerators, mechanically activated cement and additives as a coarse aggregate.

 The technology for preparing the claimed concrete is as follows. A metered amount of cement and sand is fed into the concrete mixer, they are mixed for 1-2 minutes, the water required for mixing is added and mixing of these components is continued for another 2-3 minutes until a mixture is homogeneous throughout the volume. Then, when the concrete mixer is operating, granulate is loaded and all components are finally mixed for 3-4 minutes. The prepared concrete mixture is laid in the mold. After laying, no additional compaction of the mixture by vibration or any other method is required. The concrete mixture laid in the mold is subjected to hardening in natural conditions or heat and moisture treatment according to the conditions adopted in the production of dense concrete. Examples and properties of the claimed concrete are given in table. 1 and 2.

 Data analysis table. 2 shows that the use of artificial granulate obtained from ash and slag waste from incineration plants as a large aggregate in the manufacture of dense concrete allows not only to obtain environmentally friendly building materials from harmful raw materials, the content of harmful substances in which is many times (more than 5 times) below the required MPC standards, and, thus, significantly expand the base of cheap aggregates for concrete. Disposal of ash and slag waste from incinerators contributes to the solution of one of the most acute environmental problems - the disposal of highly toxic waste from burning solid waste.

 In addition, as can be seen from the table. 2 data, the proposed concrete provides almost complete isolation of harmful substances contained in the granulate waste. Therefore, in dense concrete, granulate made of dispersed toxic waste from the metallurgical, chemical, mining, radio engineering industries, energy waste (ashes and slag of thermal power plants), contaminated soils, etc. can be used as a large granular aggregate.

Claims (1)

 Concrete, including large granular and fine aggregates bonded with cement stone, characterized in that it contains granules of fractions 5-20 mm made from dispersed ash and slag waste from incinerators, mechanically activated cement and additives as a coarse aggregate.

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