Resistance of RubCon

Corrosive attack of an aggressive medium on composite polymeric materials is manifested as a change in its structure and properties without disruption of integrity or with destruction of the materials. The corrosion environment penetrates between macromolecules through micropores and fine capillaries and irreversibly changes the chemical structure of the composite and reinforcing bars or libers as well. Such changes of RubCon structure are characterized by formation of new active 

---

As a rule, the most widespread liquid environments are water solutions of acids, alkalis, and salts. Chemical resistance of RubCon was specified as a change in weight and compressive strength of the samples after their exposure to aggressive liquid environments during a certain period of time. The choice of aggressive environment compositions was based on their prevalence in industrial production. 

A basic guideline in a choice of corrosion environments during the test of RubCon specimens was their wide spreading into industrial production. Such environments were water, 30% and 70% solutions of sulfuric acid, 5% solutions of phosphoric and acetic acids, 3% solution of nitric acid, 3% and 30% solutions of hydrochloric acid, 10% solutions of lactic and lemon acids, caustic soda and caustic potash, diesel fuel, acetone, 25% water solution of ammonia, 30% solution of copper vitriol, and a saturated solution of sodium chloride. Chemical resistance of RubCon was estimated on test specimens measuring 4 x 4 x 16 cm [21-23],... 

As shown in Table 2.7, the coefficient of chemical resistance of RubCon is 1.0 for water, 0.81-0.95 for all mineral acids (exception is KCI = 0.69 for 36% solution of hydrochloric acid), 0.82-0.95 for organic acids, 0.82-0.91 for alkalis, 0.88 for solvents and petroleum products, and 0.84-0.86 for solution of salts. The analysis of experimental data has shown that RubCon offers universal chemical resistance many times higher than ordinary Portland cement concrete and surpasses the chemical resistance of polyester, polyepoxy, and vinyl ester polymer concrete. It is worth noting that penetration depths of 5% nitric and 36% solution of hydrochloric acids into RubCon sample bodies were 3, 4, and 5.1 mm, respectively the penetration ability of these acids is higher as compared with other corrosive environments. 

It can be seen that the elevated temperature reduces the chemical resistance of RubCon samples and leads to their destruction due to accelerated chemical reactions between the corrosion environment and the material. 

Impact of Elevated Temperatures on Chemical Resistance of RubCon... 

Predicted Chemical Resistance of RubCon after 10 Years of Operation in Corrosive Environments... 

Effect of Oxides and Salts of Multivalent Metals on Resistance of RubCon in 36% Solution of HCL... 

The estimation of radioactive resistance of RubCon was done by studying its compressive strength and modulus of elasticity depending on the absorbed dose of radiation. The source of radiation was the isotope Co60. The maximum absorbed... 

The experiments show that the coefficient of radioactive resistance of RubCon at an absorbed dose of 50 106 R is equal to 1.0. 

The analysis of experimental data shows (Table 2.15) that RubCon displays universal chemical stability and keeps it after y-radiation exposure. Coefficients of chemical resistance of RubCon were above 0.80 in all environments except for a 36% solution of hydrochloric acid, where it was equal to 0.69. 

Further research has shown that replacement of granite rubble by quartz sand allows an increase if the coefficient of chemical resistance of RubCon up to 7% in a 36% solution of hydrochloric acid. 

---