Increase of durability of expanded clay lightweight concretes for thin-walled hydraulic engineering and transport structures through the use of modifiers
Journal Title: Вісник Одеської державної академії будівництва та архітектури - Year 2017, Vol 1, Issue 69
Abstract
Purpose of the work is to increase the durability and mechanical properties of expanded clay lightweight concrete for thin-walled hydraulic engineering and transport structures. To achieve the purpose modifiers were used. A three-factorial planned experiment was carried out. Such factors of light concrete composition were varied: the amount of cement (500-600 kg/m3), silica fume (0-50 kg/m3) and superplasticizer S-3 (0.5-1%). Concretes were made from mixtures of equal mobility P2. It was found that the compressive strength of expanded clay lightweight concretes was in the range from 32 to 43 MPa. The tensile strength of these concretes was in the range from 5.6 to 7.0 MPa. Due to the introduction of 30-35 kg/m3 of silica fume the compressive strength of expanded clay lightweight concretes is increased at 2 MPa and the tensile strength at bending increases by 0.3 MPa. Similarly, the increase in strength occurs when the amount of the S-3 additive is increased to 0.8-1%. The average density of expanded clay lightweight concrete in the dry state was from 1660 to 1740 kg/m3. After saturation with water, the average density of concrete was from 1780 to 1840 kg/m3. Such concrete can be used for thin-walled hydraulic engineering and transport structures, in particular for the construction of pumping stations and floating reinforced concrete structures. In the climatic conditions of Ukraine, the durability of concrete in hydraulic engineering and transport structures is ensured by its water-resistance and frost-resistance. The water-resistance of expanded clay lightweight concrete was in the range from W4 to W14. The frost-resistance was in the range from F400 to F550. The amount of cement most significantly affects water-resistance and frost-resistance. Water-resistance is increased by one grade with the introduction of silica fume and with an increase in the amount of the S-3 additive. Also, with the introduction of modifiers, the frost resistance of concrete is increased by 100 cycles. Thus, the durability of expanded clay lightweight concrete for thin-walled hydraulic engineering and transport structures increases with the introduction of modifiers in the optimal amount.
Authors and Affiliations
A. V. , Mishutin, S. O. Kroviakov, O. V. Pishev, L. V. Dudnik, K. A. Streltsov, G. G. Tkachenko
Keywords
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- EP ID EP327668
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