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Responsible management of aggregate waste to improve the properties of anti-corrosion coatings

Wygoda Mateusz, Jachimowski Artur

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

2023

z. 172

717--736

Purpose: The aim of the study was to investigate the possibility of using engineering waste materials in the form of brick dust and volcanic tuff as corrosion inhibitors. The corrosion tests were carried out on the aluminium alloys against aggressive corrosive environments with acidic pH containing chlorine compounds. Design/methodology/approach: The specimens for corrosion tests were cut from a sheet made of aluminium alloy EN AW-6060. In the first step the aluminium specimens was covered with a coating of clear alkyd varnish without any additives. In the next step used additives in the form of brick dust and vulcanic tuff were used. The tests were carried out using a RADWAG AS 310.R2 laboratory analytical balance to obtain the weight loss results for the specimens tested. Findings: Brick dust used in concentrations of 10% to 40% by weight cannot be considered as a material that allows achieving satisfactory results. This is due to the absorption of the corrosive medium by the brick dust. On the other hand, the volcanic tuff addition of 30% by weight creates conditions that slow down the corrosion process in the long term. Research limitations/implications: Consideration should be given to preparing all types of structural components for corrosion protection by blunting sharp edges for better adhesion of corrosion protection coatings. Therefore, further work should focus on obtaining a coating with an adequate adhesion as well as checking the action of volcanic tuff as an inhibitor in other corrosive media. Practical implications: The introduction of appropriately prepared volcanic tuff additives into protective coatings is expected to increase the effectiveness of the protection of the metal substrate against the corrosion process. It is therefore important to manage and monitor the factors that affect the coating and occur during the painting process. Originality/value: In tests confirmed the good properties of volcanic tuff, which slows down corrosion processes and preserves the uniform corrosion of aluminium. The result obtained has the lowest mass loss values of all the specimens prepared in the experiment, which proves the validity of using the volcanic tuff additive.

Badania kalorymetryczne wpływu plastyfikatora i domieszki napowietrzającej na kinetykę hydratacji cementów wieloskładnikowych z dodatkiem pucolany w formie pyłu ceglanego

Jerman M., Tydlitát V., Černý R.

Cement Wapno Beton

2016

R. 21/83, nr 1

1--9

Wydzielanie ciepła podczas hydratacji spoiw złożonych z cementu portlandzkiego i zmielonej cegły (materiał wytwarzany współcześnie – cegła dziurawka) badano w kalorymetrze izotermicznym. Uwzględniono w badaniach wpływ plastyfikatora, środka napowietrzającego oraz ich mieszaniny; hydratację badano w etapie początkowym, do 140 h od sporządzenia zaczynu. Wyniki wskazują, że zastąpienie do 20% cementu przez pył ceglany nie wpływa na szybkość hydratacji; przy większych udziałach następuje spowolnienie hydratacji C3S o około 2 h. Początek reakcji pucolanowej stwierdzono po 45 h; reakcja ta biegnie dalej i zaznacza się najbardziej przy zawartości 20% pyłu. Nie stwierdzono istotnego wpływu zastosowanych w pracy domieszek. Opóźnienie hydratacji C3S w obecności plastyfikatora, domieszki napowietrzającej i ich mieszaniny jest we wszystkich przypadkach mniejsze niż 2 h, a wielkość efektu na krzywej kalorymetrycznej jest tylko o około 7% mniejsza.

The hydration heat development in blended binders composed of Portland cement and waste ceramic powder originating in the contemporary hollow brick production is analyzed by isothermal calorimetry, including the influence of plasticizer, air-entraining agent and their combination on hydration kinetics, in the early hydration period up to 140 h. Experimental results show that the brick powder does not affect the rate of hydration reactions up to 20% Portland cement replacement level, for higher dosage the C3S hydration process is slowed down by about 2 h only. The pozzolanic reaction is identified to begin at 45 h; it continues during the whole remaining time period and is most pronounced up to 20% brick powder dosage in the blends. The influence of applied chemical admixtures on the hydration heat development is found not very significant. The retardation effects of superplasticizer, air-entraining agent and their combination on the C3S hydration are lower than 2 h in all analyzed cases and the magnitude of the C3S maximum of heat evolution curve is only up to 7% lower.