Influence of different monomer ratios and recycled concrete aggregate on mechanical properties and durability of geopolymer concretes

By Mahdi Koushkbaghi, P. Alipour, B. Tahmouresi, E. Mohseni, Ashkan Saradar, P. Sarker. Construction and Building Materials, 2019

145 citations recorded by the source corpus.

Abstract Properties of geopolymer concrete using metakaolin (MK) as the aluminosilicate source and recycled concrete aggregate (RCA) as partial replacement of natural aggregate are presented in this paper. The effects of sodium silicate (SS) to sodium hydroxide (SH) ratios, and RCA in different percentages on the mechanical and durability properties of geopolymer concrete were determined. Microstructural changes of geopolymers as a result of using RCA were evaluated via scanning electron microscopic (SEM) images. Test results showed that compressive strength of geopolymer concrete improved with increasing the SS/SH ratio. Although the use of RCA reduced compressive strength by up to 28%, the strength was still high enough for structural applications. In addition, increasing the SS/SH ratio reduced the chloride ion permeability and absorption of geopolymer concrete. The morphology results showed that the deboning width at the interfacial transition zone (ITZ) between RCA and binder decreased with the increase of SS/SH ratio. The polymer products in the proximity of adequate monomer ratios became more uniform and homogenous. Results also showed that the binder with a SS/SH ratio of 3 exhibited higher density and less porosity than that with smaller ratios. Therefore, the recycled construction and demolition waste can significantly contribute to the sustainability of construction industry from technical, economic and environmental points of view.

Subfields: Building and Construction, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/1bc576d3f35b82774d11f559afdd0850872b4849

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Building and Construction

In Civil and Structural Engineering

Citations in the corpus

A Review of Recent Developments and Advances in Eco-Friendly Geopolymer Concrete (2020, background): “It was found that with an increase in silicate/hydroxide ratio, the microstructural and durability performance of MK-based GPC increases because of strong interfacial transition zone (ITZ) between recycled aggregates and binder [61].”
Advanced progress in recycling municipal and construction solid wastes for manufacturing sustainable construction materials (2020, background): “Nevertheless, as shown in Table 3, the geopolymer composites containing recycled concrete aggregate could still fit a wide range of strength requirements through amending characteristics of the source materials or alkaline activating solution, optimizing the ingredient portion, and choosing the suit”