RT info:eu-repo/semantics/article
T1 Review of the materials composition and performance evolution of green alkali-activated cementitious materials
A1 Yu, Xiaoniu
A1 Shi, Jin-yan
A1 He, Zhi-hai
A1 Yalçinkaya, Çağlar
A1 Revilla Cuesta, Víctor
A1 Gencel, Osman
K1 Alkali-activated materials
K1 Precursor material
K1 Alkali activator
K1 Materials composition
K1 Sustainability
K1 Ingeniería civil
K1 Civil engineering
K1 Materiales de construcción
K1 Building materials
AB Alkali-activated cementitious materials (AAMs) are a kind of green building materials compared to Portland cement components. This review considers the related research on the AAMs to systematically summarize the results on its materialscomposition and performance infuencing factors. The precursor material is mainly industrial solid waste containing Al2O3and SiO2. The alkali activator is compound containing caustic alkali and basic elements, which can provide an alkaline environment. Meanwhile, some new green precursors and alkali activators are summarized in this review. The main mechanismof alkali-activated reaction is that the hydroxide ion from the alkali activator nucleophilically attacks the covalent bonds ofAl–O and Si–O in the precursor material, which generates Si(OH)4 and Al(OH)4−. They generate three-dimensional networkgel of tetrahedral structure of [SiO4] and [AlO4]− through polycondensation reaction, which forms cement stone-like blockmaterial after setting and hardening. Too high or too low concentration of alkali activator is detrimental to the workabilityand mechanical properties of AAMs. When the ratio of Na/K to Al is small, the mechanical properties of AAMs are reduced.When the Ca content in the AAM is high, calcium ions enter the polycondensation chain and reduce the degree of polymerization and mechanical properties of the aluminosilicate gel phase and increase the shrinkage deformation. The hydrationproducts in the AAM are free of calcium hydroxide, calcium aluminate hydrate, ettringite, etc., and can resist the erosionof acid and sulfate media. The main aim is to provide an informed outlook on the advantages and drawbacks of AAMs andpresent a comprehensive review of the studies performed in this area.
PB Springer Nature
SN 1618-954X
YR 2023
FD 2023-01
LK http://hdl.handle.net/10259/8002
UL http://hdl.handle.net/10259/8002
LA eng
NO Artículo de revisión
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024