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Journal: Bulletin of Prydniprovs'ka State Academy of Civil Engineering and Architecture (Vol.2015, No. 3)

Publication Date:

Authors : ; ; ;

Page : 44-50

Keywords : liquid glass; hardener; binder; concrete mixture; setting time.;

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Currently due to modernization of the residential building the priority is given to the problems of selection of light effec-tive materials that can be simultaneously applied to the bearing and heat-insulating structures. The advantage of effec-tive materials can be fully implemented in the construction of individual houses, where along with various building de-signs, thermal devices such as stoves, fireplaces, saunas, chimneys, etc. are used. Analysis of the current state of devel-opment and research of lightweight concrete has shown that the most appropriate as a binder would be the usage of liquid glass. Positive experience of usage in metallurgy the compositions of heat refractory concrete on liquid glass [1] has shown that they have a number of distinctive positive properties that have clear advantages compared to conven-tional concrete on cement and lime binders., namely: to have accelerated setting time. Analysis of publications. Since the essential characteristic for liquid glass mixtures is the hardening process, which is based on the reaction between the liquid glass and a hardener, it is necessary to use an effective hardener, which provides hardening conditions for these mixtures. Previously as a hardening agent sodium silicofluoride was often used [2], at that the optimal amount of sodi-um silicofluoride was established, which is 10 ? 12 % from liquid glass weight. In the study [3] the possibility of re-placement of silicofluoride with self scattering slag of metallurgical enterprises was shown; the later contain β and γ ? 2CaO ? SiO2. The most accessible of these slags is ferrochromium slag, which is a waste of ferrochrome production. There is a positive experience of usage in the compositions of heat refractory concretes aluminous cement, which is a hardener for liquid glass [4]. Experimental data established that the most appropriate hardener for liquid glass is ferro-chromium slag [5]. In this case, based on liquid glass with hardener of ferrochrome slag, a number of concrete with high physical-mechanical, thermal and insulating properties was obtained. Currently usage as a hardener of sodium silico-fluoride, ferrochrome slag and alumina cement is constrained due to their high cost and the severance of economic ties with Russia, the producing country of these materials. The aim of the work was to determine the reaction of possibilities with respect to the liquid glass of Portland cement, phase composition of which is also presented with calcium silicates. At the same time there was a task to compare the dates of the beginning and the end of the hardening of the mixtures with known hardeners of liquid glass with mixtures with hardeners from Portland cement of different brands. Conclu-sions. The performed testing of liquid glass mixtures with different hardeners showed that the most economically viable is the usage of Portland cement M400 as a hardener for liquid glass. In the conditions of the building in the summer time it is feasible to expect reduction of setting time for mixtures with increased air temperature.

Last modified: 2015-10-26 22:19:29