PSI - Issue 59

Volodymyr Dovbenko et al. / Procedia Structural Integrity 59 (2024) 702–709 Volodymyr Dovbenko et al./ Structural Integrity Procedia 00 (2019) 000 – 000

704

3

polymers, as water has a significant surface tension. Such crusts are formed in the capillaries of concrete in places of narrowing of pores. In the case of hydrophobization of the surface of the pores with a polymer composition, water is displaced from the narrowing places. It was investigated that the viscosity determines the process of concrete impregnation with polymer compositions, the polymerization rate of monomers, the distribution of pores in the volume of concrete, and the penetrating ability of the composition components into the concrete structure.

Table 1 – Characteristics of experimental samples.

Number of samples

Sample sizes, mm

Concrete class

Factors studied

Type of samples

The first series of studies

Controlled cubes Strengthened cubes

3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3

Cubic strength under axial compression Cubic strength under axial compression Prism strength under axial compression Prism strength under axial compression Cubic strength under axial compression Cubic strength under axial compression Cubic strength under axial compression Prism strength under axial compression Prism strength under axial compression Prism strength under axial compression Prism strength under axial compression Cubic strength under axial compression Cubic strength under axial compression Prism strength under axial compression Prism strength under axial compression Prism strength under axial compression Prism strength under axial compression

150×150 150×150

С16/20 С16/20 С16/20 С16/20 С16/20 С 25/30 С 25/30 С 25/30 С 25/30 С 25/30 С 25/30 С 25/30 С 25/30 С 25/30 С 25/30 С 25/30 С 25/30

Controlled prisms (compression) Strengthened prisms (compression)

150×150×600 150×150×600

Controlled cubes

150×150

The second series of studies

Controlled cubes Strengthened cubes

150×150 150×150

Controlled prisms (compression) Strengthened prisms (compression) Controlled prisms (tension) Strengthened prisms (tension)

150×150×600 150×150×600 100×10 0×600 100×10 0×600

The third series of studies

Controlled cubes Strengthened cubes

150×150 150×150

Controlled prisms (compression) Strengthened prisms (compression) Controlled prisms (tension) Strengthened prisms (tension)

150×150×600 150×150×600 100×10 0×600 100×10 0×600

The novelty of the penetrating action technology lies in the possibility of quick reinforcement of concrete and reinforced concrete constructions with a polymer composition without disturbing the statics of the structures. Also, the polymer composition is characterized by high adhesive properties that depend on the shape of the molecules. That is, on the spatial arrangement of the structural elements of the connections. The flexibility of connections and significant density have a positive impact. The polymer composition properties are given in (Yasniy et al. (2022)). The mechanical characteristics of unreinforced and reinforced concrete (impregnated) with a polymer composition were determined experimentally based on the results of an experimental study - cubes and prisms for central compression in a hydraulic press (Fig. 1a,b). Compression testing was carried out under a one-time static load. The prisms were centered along the geometric axes before starting the experiments. A one-time load was applied to all samples by steps to failure. The load was assumed to equal approximately 10% of the expected destructive force. The load on each stage was carried out under constant speed, and exposures lasted 5 minutes. The relative deformations of the samples were measured by strain gauges with measurement bases of 20 and 50 mm, respectively, pasted on four side faces in the longitudinal direction (two strain gauges on each face) and watch-type indicators with a price of divisions of 0.001 mm on a base of 400 mm. Studied schemes and dimensions of test samples are shown in Fig. 2a,b,c.