Development and Characterization of Fly Ash–Slag Blended Geopolymer Mortar and Lightweight Concrete

AbstractA synopsis of an experimental program on the development of a sustainable fly ash–slag blended geopolymer mortar (GPM) and lightweight geopolymer concrete (LGPC) is presented. Geopolymer mortar mixes were prepared incorporating industrial by-products and sustainable desert dune sand to study...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials in civil engineering 2018-04, Vol.30 (4)
Main Authors: Ismail, Najif, El-Hassan, Hilal
Format: Article
Language:English
Subjects:
Aluminum
Binding
Building materials
Civil engineering
Compressive strength
Curing
Dune sand
Electron microscopy
Fly ash
Lightweight
Mechanical properties
Microstructure
Reaction products
Rheological properties
Sand
Sustainable development
Technical Papers
Weight reduction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:AbstractA synopsis of an experimental program on the development of a sustainable fly ash–slag blended geopolymer mortar (GPM) and lightweight geopolymer concrete (LGPC) is presented. Geopolymer mortar mixes were prepared incorporating industrial by-products and sustainable desert dune sand to study the effect of different mixing variables, including binding materials, curing temperature, and alkaline activator solution composition and content, on the rheological and mechanical performance. Optimum mix designs were then formulated into producing LGPC samples with different binding materials and curing temperature. Lightweight geopolymer concrete specimens exhibited a brittle behavior with a weakened structure due to low-strength lightweight aggregates. Lightweight geopolymer concrete made with dune sand and a fly ash to slag ratio of 3∶1 resulted in the highest compressive strength when cured for 24 h at 60°C. Microstructure characterization of LGPC specimens was also conducted. Scanning electron microscopy and differential scanning calorimetry showed the coexistence of an aluminosilicate hydrate geopolymer gel and aluminum-modified C─ S─ H gel as the main polymerization reaction products in an amorphous geopolymeric microstructure.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)MT.1943-5533.0002209