Effects of various additives on the crumb rubber integrated geopolymer concrete

Gill, Parmender; Parveen,; Roychand, Rajeev; Saberian, Mohammad; Li, Jie

doi:10.1016/j.clema.2023.100181

Cited by 19 publications

(3 citation statements)

References 58 publications

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“…The appearance of the hump on the diffractogram at position 15-35 • 2θ indicates the presence of an amorphous phase, which was identified as a C-S-H compound. Moreover, sharp diffraction peaks observed in particular positions on the diagram as a result of the use of X-rays were assigned to crystalline phases [70]. Albite and anorthite belong to plagioclase feldspar minerals, and due to their high stability, they can serve as a filler or reinforcing material [71].…”

Section: Compound [%]mentioning

confidence: 99%

Influence of Waste Glass Addition on the Fire Resistance, Microstructure and Mechanical Properties of Geopolymer Composites

Ziejewska,

Grela,

Mierzwiński

et al. 2023

Materials

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Nowadays, humanity has to face the problem of constantly increasing amounts of waste, which cause not only environmental pollution but also poses a critical danger to human health. Moreover, the growth of landfill sites involves high costs of establishment, development, and maintenance. Glass is one of the materials whose recycling ratio is still insufficient. Therefore, in the presented work, the influence of the particle size and share of waste glass on the consistency, morphology, specific surface area, water absorption, setting time, and mechanical properties of geopolymers was determined. Furthermore, for the first time, the fire resistance and final setting time of such geopolymer composites were presented in a wide range. Based on the obtained results, it was found that the geopolymer containing 20% unsorted waste glass obtained a final setting time that was 44% less than the sample not containing waste glass, 51.5 MPa of compressive strength (135.2% higher than the reference sample), and 13.5 MPa of residual compressive strength after the fire resistance test (164.7% more than the reference sample). Furthermore, it was found that the final setting time and the total pore volume closely depended on the additive’s share and particle size. In addition, the use of waste glass characterized by larger particle sizes led to higher strength and lower mass loss after exposure to high temperatures compared to the composite containing smaller ones. The results presented in this work allow not only for reducing the costs and negative impact on the environment associated with landfilling but also for developing a simple, low-cost method of producing a modern geopolymer composite with beneficial properties for the construction industry.

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Section: Compound [%]mentioning

confidence: 99%

Influence of Waste Glass Addition on the Fire Resistance, Microstructure and Mechanical Properties of Geopolymer Composites

Ziejewska,

Grela,

Mierzwiński

et al. 2023

Materials

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Section: Introductionmentioning

confidence: 99%

“…Mechanical properties are affected by many factors, such as porosity, concentration of alkaline solution, and particle size of materials. These properties can also be changed by the additives used, such as glass fiber, glass waste, or natural fibers or other waste materials [19][20][21] These are materials the porosity of which depends, among others, on the concentration of the alkaline activator used [6,8,[22][23][24][25]. The methods of testing this geopolymer property are very important, especially when they are used in an environment with high humidity or catalyst matrix.…”

Section: Introductionmentioning

confidence: 99%

Possibilities of Checking Water Content in Porous Geopolymer Materials Using Impedance Spectroscopy Methods

Mierzwiński,

Walter,

Wanat

2023

Materials

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The porous geopolymer has been tested for its content of water using impedance methods. The pores of the material were filled with distilled water using a desiccator and a vacuum pump. An analysis of differential scanning calorimetry (DSC) was carried out in the next step to check the content of water, porosity and approximate value of specific heat of the geopolymer. Additionally, mercury porosimeter has been used for checking the porosity. The geopolymer material characterized in this way was subjected to impedance tests aimed at developing a quick method for assessing the water content in the material. Impedance measurements have been realized on an electrochemical workstation applying a 50 mV non-destructive amplitude of the potential and a frequency range of 1 Hz to 100 kHz. Change in the module of impedance and the phase shift angle were measured while the material was dried out. Significant differences were observed. The obtained graphs were simulated using a schematic model consisting of constant phase elements (CPEs) and a resistor (R). These values showed mechanisms of charge conduction. A simple method for assessing the water content of a porous geopolymer has been proposed in this paper. The real and imaginary impedance values were shown in Nyquist graphs. These graphs have characteristic maxima that move according to a linear equation with decreasing water content. Changes in Nyqiust charts are clearly visible even with small changes in the water content of the material and can be very useful for assessing it.

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