Effects of foam agent on characteristics of thin‐film transistor liquid crystal display waste glass‐metakaolin‐based cellular geopolymer

Abstract

Thin‐film transistor liquid crystal display (TFT–LCD) waste glass comprises mainly SiO2 and Al2O3, which are suitable raw materials for geopolymer. This study investigates the effects of the amount of foam agents on the properties of waste glass‐based cellular geopolymer. In this investigation, samples underwent a series of tests to determine their quality, including mechanical characterization, compressive strength, flexural strength, fire resistance, thermal conductivity, Fourier transform infrared spectroscopy, and scanning electron microscopy. The experimental results show that the mechanical strength and thermal conductivity decreased with the addition of foam agents, indicating that foam agents can reduce the thermal transfer. The pore volume increased with the amount of increase in foam agent. These results indicated that the amount of foam agent has a more substantial effect than waste glass replacement in geopolymers. © 2013 American Institute of Chemical Engineers Environ Prog, 33: 538–550, 2014

Effects of surfactants/stabilizing agents on the microstructure and properties of porous geopolymers by direct foaming

“…For the geopolymer, the broad band from 3658 to 3180 cm −1 detected in the spectra can be assigned to stretching vibration of structural water and free water, and the small bands at 1651 and 714 cm −1 is attributed to the bending vibration of free water [14,31,33]. The occurrence of new correlative characteristic bands, the disappearance of the band at 802 cm −1 , and the obvious shift of the center of broad bands from about 1080 toward 1002 cm −1 , compared with pure MK, jointly indicated the proceeding of the geopolymerization reaction and setting [14,[30][31][32]. The new weak intensity of band located at 1392 cm −1 is assigned to the vibration of the C-O bond of carbonate groups by the atmospheric carbonation of the alkaline cations [32].…”

“…The characteristic bands of MK can be clearly observed at 1080, 802, 566, and 460 cm −1 [14,-29-32]. The strong broad band with wavenumber centered at 1080 cm −1 is related to the stretching vibration of Si-O-Al and Si-O-Si [14,30], and previous works reported that this broad band from 1200 to 1000 cm −1 is caused by the overlapping of bands derived from dehydroxilated pyrophyllite [29,31]. Furthermore, the band at 802 cm −1 corresponds to the O-Al-O bending vibrations of AlO 4 tetrahedra [29,31], and the band with low intensity detected in the spectrum at 566 cm −1 belongs to the Si-O-Al bond in octahedral coordination [14,30].…”

The effects of SiO2/Na2O molar ratio on the characteristics of alkali-activated waste catalyst–metakaolin based geopolymers

“…Chemical composition: X-ray fluorescence (XRF) analysis was performed using an automated RIX 2000 spectrometer. Specimens were prepared for XRF analysis by mixing 0.4 g of sample and 4 g of 100 Spectroflux at a dilute ratio of 1:10 [40]. The homogeneous mixtures were placed in Pt-Au crucibles before being heated for 1 h at 1000°C in an electric furnace.…”

Effects of Aluminium Addition on Inhibition of Concrete Expansion Resulted From Alkali Silica Reaction (Asr)

“…A numbers of techniques can be employed to create pores in concrete. One of simplest and the most effective techniques is to add air entrainment agents such as aluminium powder [16]- [19], metallic silicon [20]- [21] and hydrogen peroxide [22]- [23].…”