Lightweight Heat Resistant Geopolymer-based Materials Synthesized from Red Mud and Rice Husk Ash Using Sodium Silicate Solution as Alkaline Activator

Nguyen Hoc Thang,Mohd Mustafa Al Bakri Abdullah,Pham Trung Kien,M.A.B Abdullah,M.F Ghazali,M.E Muhammad Suandi,S.Z Abd Rahim,M.N Mat Saad

doi:10.1051/matecconf/20179701119

Nguyen Hoc Thang, Mohd Mustafa Al Bakri Abdullah + Show 6 more

Open Access

https://doi.org/10.1051/matecconf/20179701119

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Abstract

Geopolymer is an inorganic polymer composite with potentials to replace Ordinary Portland Cement (OPC)-based materials in the future because of its lower energy consumption, minimal CO 2 emissions and lower production cost as it utilizes industrial waste resources. Hence, geopolymerization and the process to produce geopolymers for various applications like building materials can be considered as green industry. Moreover, in our study, the raw materials we used are red mud and rice husk ash, which are are industrial and agricultural wastes that need to be managed to reduce their impact to the environment. The red mud and rice husk ash combined with sodium silicate (water glass) solution were mixed to form geopolymer materials. Moreover, the geopolymer specimens were also tested for heat resistance at a temperature of 1000°C for 2 hours. Results suggest high heat resistance with an increase of compressive strength after exposed at high temperature.

Highlights

Geopolymer, as coined by Davidovits [1], is an inorganic polymer composite which has a potential sustainable construction material because of its lower energy and carbon footprint as compared to Portland cement-based materials [2]
Red mud (RM) is the waste generated during aluminum production from bauxite ore
The geopolymer samples were tested for 28 day- compressive strength and the results showed that the values range from 6.83 MPa to 15.50 MPa

Summary

Introduction

Geopolymer, as coined by Davidovits [1], is an inorganic polymer composite which has a potential sustainable construction material because of its lower energy and carbon footprint as compared to Portland cement-based materials [2]. Such material uses industrial waste such as red mud as raw material which reduce its cost of production. Red mud (RM) is the waste generated during aluminum production from bauxite ore. It is imperative to manage these red mud wastes properly to reduce its impact to environment and community

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Conclusion