Geopolymer coating as a protection of concrete against chemical attack and corrosion

Abstract

Abstract. In order to mitigate and prevent chemical attack and concrete corrosion one has to choose the right concrete to make it less permeable or isolate it from the corrosive environment by using a suitable coating. Here, we present the use of geopolymer mortar made of local waste materials and sodium silicate as a chemo-resistive coating for concrete. In this paper, the development of geopolymer mortar working parameters (e.g. setting time and adhesion to concrete) is described. Here, we investigated the resistance of concrete samples coated with geopolymer to 10% inorganic/organic acids and saturated solution of sodium chloride. During the soaking in corrosive environment, weight loss and compressive strength were measured. Geopolymer coating described in this work showed great resistance to organic and inorganic acids. Coating of concrete samples reduced their weight loss after exposure to organic acids from 15% to 2% with concomitant compressive strength loss from 49% to 9% of the initial value. The difference in chemical resistance for inorganic acids was even more visible. Coating of concrete samples reduced their weight loss after exposure to inorganic acids from 73% to 0.8% with adequate compressive strength loss from 96% to only 3.5% of the initial value.

Study on the Possibilities of Developing Cementitious or Geopolymer Composite Materials with Specific Performances by Exploiting the Photocatalytic Properties of TiO2 Nanoparticles

“…It should be noted that, as reported by several research [ 217 , 218 , 219 , 220 , 221 , 222 ], a problem in producing these composites is the way of incorporation of NT, as this is relatively difficult to ensure a homogeneous dispersion, NT tending to agglomerate. Another controversy is in terms of self-cleaning capacity, with Guerrero et al [ 220 ] indicating that 1 wt% NT is sufficient and Yang et al [ 221 ] indicating an optimum requirement of 10 wt% NT.…”

“…Aguirre-Guerrero et al [ 234 ] explored the potential of hybrid geopolymer coatings as a protective coating for reinforced concrete structures subjected to a marine environment. Sikora et al [ 217 ] studied the applicability of geopolymer mortar as a coating to protect concrete from chemical attack and corrosion. Self-cleaning facades are gaining momentum in the construction industry.…”

Formation of geopolymeric materials properties depending on the molar modules of SiO2/Al2O3 and SiO2/Na2O

“…Wykorzystanie materiałów z surowców UPS jest w pełni uzasadnione w przypadku zastosowań specjalnych, dla których niezbędne są właściwości geopolimerów tj. dużą odporność na korozję chemiczną, mrozoodporność oraz ognioodporność w połączeniu z dobrą wytrzymałością mechaniczną (7,12,13).…”

“…Every year in the European Union, there is a decrease in the production of coal combustion by-products [CCBs] due to the shift from conventional energy to renewable energy sources [RES] (11). The use of this type of materials based on CCBs is fully justifi ed, in the case of unique applications for which geopolymer properties are necessary, that is, high chemical corrosion resistance, frost resistance and high temperature resistance, combined with high mechanical strength (7,12,13).…”

Rheology effect and enhanced thermal conductivity of diamond/metakaolin geopolymer fabricated by direct ink writing

“…Geopolymer has excellent performances [e.g. lower carbon emissions (Abdollahnejad et al , 2015), excellent durability (Thokchom et al , 2011) and impermeability (Mas et al , 2015), chemical corrosion (Sikora et al , 2018)/high-temperature (He et al , 2010)/water and heat resistance (Song et al , 2018), adequate fixation of nuclear waste and active fixation of heavy metal ions (Zhuang et al , 2016)] because of its 3D sponge-like network structure. Green raw materials and pollution-free curing process demonstrate geopolymer broad application prospects in architecture and space construction (Wang et al , 2016), solid waste materials (Ferone et al , 2013a, 2013b) andsealing materials (Komnitsas, 2011).…”