CONCRETE

[:ru]Волгушев А. Н.[:en]Volgushev A. N.[:] [:ru]к.т.н., ст. научный сотрудник лаборатории Анализа и прогноза НИИЖБ им Гвоздева А.А., Москва[:en]Reinforced Concrete Research Institute named after of А.А. Gvozdev, Moscow[:]

Alitinform №5 (06) 2008 г. 41-56 p.

Abstract

The paper provides the results of the works of the study of processing parameters for preparation and molding the composite materials on the base of thermoplastic sulphurous binder. It shows the promising course of perfection of the existing designs and of development of new designs of long-life, chemical-resistant structures of concrete on the base of such binder.

General

In resent years the steady process of overproduction of technological sulphur produced as byproduct of oil and gas refinement and gas purification is observed, that has generated a need for a search of new areas of using it.

Reinforced Concrete Research Institute (RCRI) has completed the integrated study of proportioning as well as analysis of physical-mechanical properties and process parameters for preparation and molding of new generation of the composite materials on the base of thermoplastic sulphurous binder (TSB). The TSB production on the base of technical sulphur (TS), sulphur-containing waste (SCW) or sulphur ore (SO) allows to organize production of the new types of road construction materials, including sulphur concrete (SC), sulphur asphalt concrete (SAC). In construction field it is the most promising to use TSB as a binder for different types of composite materials, an additive to asphalt concrete, and impregnating composition.

According to the RCRI technology the production can be organized at an asphalt concrete plant (CP), the infrastructure and equipment of which allow to organize the production of sulphur asphalt concrete and sulphur concrete. The supplementary equipment in the CP system shall allow to produce sequentially the mixtures of asphalt concrete (AC), sulphur asphalt concrete (SAC), sulphur concrete (SC). (Pic. 1, 2).

The results of works accomplished in recent years in Russia and abroad indicate clearly that the dedicated production system for thermoplastic sulphurous binder construction materials would allow in a number of cases to improve the technology and decrease the period of construction considerably. Furthermore that increases the operational reliability of structures, decreases considerably power and labour costs, engages in the process technogeneous raw materials of a large-scale, thus solving not only technical, but environmental problems, allows to achieve the maximum (up to 100%) cement saving.

The RCRI designed technology is based on domestic materials and equipment. High strength and fast setting of the proposed compositions allow to use them in structures of highways, bridges, floors, hydraulic structures, industrial buildings, smokestacks, foundations, poling and other structures including those used for engineering and construction tasks solving in emergency situations. The TSB addition in the compositions of dry or floated asphalt concrete allows to decrease of bitumen demand of up to 50%, to increase of operational characteristics of the road coatings. The analysis of international experience of using sulphur compositions shows that RCRI designed compositions and technologies meet the modern international requirements.

The sulphur compositions technology can be implemented by combined efforts of the leading scientific-research and production organizations in accordance with a joint integrated program at a working CP and by creating a technological park in the following. The proposed technology is of the list of promising and economically attractive, capable of providing high cost efficiency and quick payback. The materials exceed the conventional materials by the main key parameters (strengths, corrosion resistance, environmental impact, life duration, aesthetic qualities, processability), and cost far less. The proposed technology is oriented, first of all, to the local raw material resources of the customer, usability of which is determined in a laboratory by the RCRI method. By the customer request special compositions meeting the particular requirements of the field of application can be designed.