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3PROSPECTS FOR THE USE OF LIMESTONE FOR THE PRODUCTION OF
BUILDING MATERIALS Bukaev E.Z.
Bukaev Eldar Zakharovich - teacher, DEPARTMENT OF "NATURAL SCIENCES", CASPIAN STATE UNIVERSITY OF TECHNOLOGY AND ENGINEERING NAMED AFTER SH. ESENOVA,
AKTAU, REPUBLIC OF KAZAKHSTAN
Abstract: the article offers recommendations for obtaining new materials from limestone waste, and also analyzes inventions related to the industry of building materials containing additional additives with the possibility of using for the production ofpolymer cement tiles for various purposes and wall materials. Keywords: limestone, shell rock, new building materials, waste, polymer additives, plasticizers.
UDC 635.05
In modern conditions of large-scale resource use and the growth of environmental pollution at the local, regional and global levels, the development of technology for processing industrial waste on products necessary for the national economy seems to be one of the urgent problems.
Half of the limestone mining fields under development produce stones with a strength of up to 15 kg/cm2, which is reflected in the relatively low yield of standard stone, at best 70% of the volume of the developed rock, with an average stone yield of about 50%. Limestone aggregate is not an inert aggregate in concrete [1]. The increased roughness of limestone mining waste ensures strong contacts between cement stone and aggregate in concrete due to good adhesion between them - specific adhesion [2].
The development of a waste-free technology for processing all types of limestone waste, with the production of a new plasticized material, will reduce the cost of the main products of quarries, will help reduce accumulated waste at a consumption of up to 1.7 tons of waste per 1 m3 of concrete, and improve the environmental situation.
Earlier, the authors [3] found that:
- while maintaining the growth rates of cement consumption and mobility of the mixture, the strength of carbon concrete with the addition of PAA increases by 15%, while reducing the binder consumption by 30%.
- with the introduction of polyacrylamide, the rigidity of concrete on aggregates from limestone-shell waste is reduced by more than 2 times, compared with the rigidity of the mixture without additives;
- shell limestone waste with low strength is used together with plasticizers that are not used in traditional technology, which contributes to cement savings of up to 10%, which is comparable to the consumption per unit strength in heavy concrete.
For the first time, recommendations on the use of saw limestones as aggregates in concrete were made by Prof B.G. Skramtaev [4]. Speaking about the use of "thermal" concrete in construction, Prof. B.G. Skramtaev pointed out the possibility of a shell with a strength of 10-50 kg/cm2 as a filler for it. Prior to that, high-strength limestones were used in concretes, since the production of high-quality concretes on a low-strength aggregate was doubtful.On limestones with R1 = 100 kg/cm2 and a volume weight of 2.1 t/m2, the concrete strength of 125 kg/cm2 was obtained.
The closest to our method is the technical solution presented in the author's certificate of manufacturability and the achieved result is a polymer-cement composition, including the following composition by weight, %: white cement 17-20, ground quartz sand 10-12, styrene butadiene latex 5.5-6.0, pyrite cinders 1.7-2.0, ground clay brick 54-61 and water. The main disadvantage of this composition is the high strength of finished products with a significant consumption of cement and polymer.
Thus, in all the considered developments, a flexible and more economical solution was required when experimenting with polymer additives and limestone waste of low strength. One of these, we can call the original way of solving this problem was to obtain a polymer-cement composition. Therefore, the development of a method for obtaining building materials based on limestone waste has no analogues in the world.
References
1. Simonov M.Z., Shaginyan S.G. The use of natural porous aggregates in the production of concrete and reinforced concrete. "Concrete and reinforced concrete", 1985, No. 7.
2. Grozav V.I., Mutalibova G.K. Influence of water absorption of porous limestone rubble on water absorption and water resistance of limestone concrete. Materials of the scientific and technical conference "Environmental management and environmental problems of water management and land reclamation", Moscow: MGUP, 1999. pp. 100-101.
3. A positive decision on the issuance of the auth. svid., the Russian Federation VNIIGPE on application No. 5035038/05/064180 of 12.01.93 Polymer cement composition. /Kenzhetaev G.Zh., Toksanbaev A., Dzhumagaliev M.Zh.
4. Skramtaev B.G. Building materials. -State Publishing House of Literature on Building Materials. Moscow, 1954. -643c.
