PSI - Issue 20

Kuzmin S.A. et al. / Procedia Structural Integrity 20 (2019) 278–283

279

Kuzmin S.A. et al. / Structural Integrity Procedia 00 (2019) 000–000

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1. Introduction Increase in durability and quality of the construction materials applied for production of massive products, for the building bases, for the foundations, for the hydraulic engineering constructions and et al is very relevant. The existing materials behave differently in different climatic zones. Especially it belongs to zones of a frigid climate. The special importance these questions have for seismically unstable territories and also for climatic zones of the Far North, low temperatures during the winter period and sharp annual temperature fluctuations with an amplitude of 105 degrees. Frequent transitions through 0 degree during the day in autumn and spring periods, the raised solar radiation because of transparency of the atmosphere, big humidity in zones of the Arctic climate make a negative impact on strength properties of construction materials. Application of polymeric impregnations for a covering of concrete and wooden structures performs as one of effective ways of receiving construction materials with high operational characteristics, at the same time it has the minimum economic expenses. One of the most cost-effective and efficient ways to use wood waste is to produce arbolite - this material has been known for more than a hundred years. According to many researchers, relatively simple and not expensive production technology, operational properties, range of application of arbolite are its main competitor cellular concrete and structural-heat-insulating concrete on mineral porous fillers.. However, the production of arbolite hardly develops due to the fact that the wood filler with its structure and natural formation, has such negative properties as increased chemical aggression; significant volumetric moisture deformations and development of swelling pressure; strongly marked anisotropy; high permeability; low adhesion to cement rock; considerable elasticity in compacting the consumption by Cuba et al (2014). One way to increase the strength and resistance to moisture-variable conditions of arbolite is to bring together the deformability of cement rock and wood filler by increasing the elasticity of cement rock by modifying its polymers by Nanazashvili (2019). The main operational characteristics of construction materials affecting durability of designs are durability at compression and stretching, the average density, water tightness, frost resistance, air-, gas-tightness, durability and others. 2. Materials and equipment The work investigated the strength properties of construction materials - concrete, wood and arbolite. Samples of heavy concrete M200 were made according to GOST No. 27006-86,and made a cube with a side of 10 х 10 х 10 cm The studied samples of wood (Yakut pine) were made according to GOST 16483.0-89, tests were carried out for compression according to GOST 16483.10-73 (dimensions of samples 2 х 2 х 4cm) and static bending GOST 16483.3 84 (dimensions of samples 2 х 2 х 30 cm) Samples from arbolite were cubes with a size of 10x10x10 cm and Portland cement CEM I 42.5 GOST 31108 2016 manufactured by JSC "Yakutcement" was used as a binder. Organic filler - wood chips represented by a consumption of pine and larch of fraction 5-10, sand from Lena river floodplain in the area of Yakutsk city. Tests for compressive strength and bending strength of samples maintained under natural conditions for 28 days were carried out on a hydraulic press PGM-500MG4. The polymer additive "Silor-Ultra KM" is two component low-viscous liquid on an organic basis. When concrete, brick, wood and other porous building materials are applied to the surface, it diffuses into their volume and solidifies there, then forms a new composite building material with a complex of valuable properties. The composition was used in the modification of concrete and wood. For the modification of arbolite, the polymer additive Silor-Ultra T of two-component composition on a polyurethane basis was used to increase the adhesion of cement rock to the chip and to neutralize its harmful effect, as it is known that water-soluble substances adversely affecting the cement hardening process are released from wood. Below the results of study has been presented..