Exploring Rapid Solidifying Fly Ash Cementitious Materials for Making Structural Components

Tulie Chakma, Louisiana Tech University
Stephen Gordon, Louisiana Tech University
Shaurav Alam, Louisiana Tech University
John Matthews, Louisiana Tech University

Description

Exploring Rapid Solidifying Fly Ash Cementitious Materials for Making Structural Components Authors Ms. Tulie Chakma - United States - Louisiana Tech University Mr. Stephen Gordon - United States - Louisiana Tech University Dr. Shaurav Alam - United States - Louisiana Tech University Dr. John Matthews - United States - Louisiana Tech University Abstract This paper presents experimental data on two distinct approaches for rapid curing geopolymer cementitious (GPC) materials that utilize class F fly ash. GPC is a material created through the combination of an alkali activator solution and fly ash, a waste product produced during coal burning in power plants. Rapid curing was achieved using ohmic heating and frontal polymerization approach. Ohmic heating uses electric potential where it is applied across the surface of freshly mixed geopolymer poured into a form-work to produce heat, causing the material to harden and cure to form Ohmic Cured GPC (OCGPC). On the other hand, frontal polymerization is a self-propagating exothermic reaction where the heat is applied on a local spot to initiate the reaction and then the heat producing polymerization front propagates and rapidly cures geopolymer components to form frontally polymerized GPC (FPGPC). Samples of both OCGPC and FPGPC were tested using compression tests (ASTM C109 - cube and ASTM C39 - cylinder) and viewed using Scanning Electron Microscope (SEM) imaging technique. In addition to those, Fourier-transform Infrared (FTIR) spectroscopy was used to determine the organic composition of the FPGPC samples. The proposed study has the potential for rapid construction of structural components and significant construction time savings.

 
May 14th, 1:00 PM May 14th, 1:30 PM

Exploring Rapid Solidifying Fly Ash Cementitious Materials for Making Structural Components

Grand Rapids, Michigan

Exploring Rapid Solidifying Fly Ash Cementitious Materials for Making Structural Components Authors Ms. Tulie Chakma - United States - Louisiana Tech University Mr. Stephen Gordon - United States - Louisiana Tech University Dr. Shaurav Alam - United States - Louisiana Tech University Dr. John Matthews - United States - Louisiana Tech University Abstract This paper presents experimental data on two distinct approaches for rapid curing geopolymer cementitious (GPC) materials that utilize class F fly ash. GPC is a material created through the combination of an alkali activator solution and fly ash, a waste product produced during coal burning in power plants. Rapid curing was achieved using ohmic heating and frontal polymerization approach. Ohmic heating uses electric potential where it is applied across the surface of freshly mixed geopolymer poured into a form-work to produce heat, causing the material to harden and cure to form Ohmic Cured GPC (OCGPC). On the other hand, frontal polymerization is a self-propagating exothermic reaction where the heat is applied on a local spot to initiate the reaction and then the heat producing polymerization front propagates and rapidly cures geopolymer components to form frontally polymerized GPC (FPGPC). Samples of both OCGPC and FPGPC were tested using compression tests (ASTM C109 - cube and ASTM C39 - cylinder) and viewed using Scanning Electron Microscope (SEM) imaging technique. In addition to those, Fourier-transform Infrared (FTIR) spectroscopy was used to determine the organic composition of the FPGPC samples. The proposed study has the potential for rapid construction of structural components and significant construction time savings.