Abstrakt

The corrosion of the structure of concrete caused by the aggressive external environment is one of the main problems that can reduce the durability of buildings. The paper analyzes the influence of the type of component on selected properties of lightweight concrete (LWC) exposed to aggressive liquids. When lightweight concrete containing porous aggregates is used, the influence of an aggressive environment may be of particular importance. The monograph presents the results of tests of four light concretes with different water-cement ratios and different compositions, which were exposed to aggressive liquids. The concrete mixes were prepared with a granulated expanded glass aggregate (GEGA) and granulated sintered ash aggregate (GAA) with a mineral additive silica fly ash. LWC specimens were curing in laboratory for one year and then subjected to aggressive liquids for 60 days. The types of environments were: strong acid—HCl, 1% and 2% concentration, weak acid—CH3COOH, 1% and 2% concentration, and an aqueous salt solution of Na2SO4, 1% and 2% concentration. Then, the structure was analyzed and the influence of aggressive liquids on the compressive strength of the LWC was examined. Moreover, the change in weight of lightweight concrete samples after corrosion was determined. The obtained test results indicate that the test method can be used for the accelerated estimation of the influence of aggressive liquids on the LWC. LWC with GEGA and GAA aggregates show high resistance to aggressive liquids. Moreover, the research results indicate that the most aggressive solution was HCl solution, while Na2SO4 turned out to be the least aggressive. The higher the concentration of the destructive factor, the faster the corrosion progressed. Concretes containing aggregates made of foamed glass and sintered fly ash are suitable for use both in traditional construction and in facilities exposed to an aggressive environment.

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