Alkali-activated binary mortar based on natural volcanic pozzolan for repair applications
| Autor: | Carlos M. G. Jesus, Fernando Pacheco-Torgal, Rafael Andres Robayo-Salazar, Ruby Mejía de Gutiérrez |
|---|---|
| Přispěvatelé: | Universidade do Minho |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
0211 other engineering and technologies Young's modulus 02 engineering and technology Pull-off Coating mortar symbols.namesake Flexural strength Alkali-activated materials 021105 building & construction Architecture Ultimate tensile strength Natural volcanic pozzolan 021108 energy Composite material Safety Risk Reliability and Quality Curing (chemistry) Civil and Structural Engineering Shrinkage Repair mortar Science & Technology Building and Construction Pozzolan Mechanics of Materials Ground granulated blast-furnace slag symbols Mortar |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | The goal of this investigation was evaluate the potential of an alkali-activated binary mortar (AABM), based on a natural volcanic pozzolan (70%) and granulated blast furnace slag (30%), as a repair material. This evaluation focused on its physico-mechanical characterisation (compressive, flexural and splitting tensile strengths; modulus of elasticity; capillary water absorption; and shrinkage) and the measurement of its adherence to three class of OPC concretes (substrates) using pull-off tests. A mixture of NaOH and Na2SiO3 was used as alkaline activator. The compressive and splitting tensile strength of AABM were 34.8?MPa and 2.13?MPa?at 28 days of curing, respectively. Its capillary absorption coefficient and modulus of elasticity were 0.5088?kg/m2h0.5 and 8.66?GPa respectively. The results of the pull-off test demonstrate the adherent nature of the AABM, which was promoted by the strength (quality) of the OPC substrate, with pull-off adherences of 0.75?MPa, 1.14?MPa and 1.24?MPa for class C25/30, C35/45 and C50/60, respectively. According to the results obtained and standard specifications (EN 1504-3), this material can be classified as a class R2-repair mortar. COLCIENCIAS -Departamento Administrativo de Ciencia, Tecnología e Innovación(undefined) info:eu-repo/semantics/publishedVersion |
| Databáze: | OpenAIRE |
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