Thermal Behavior of Metakaolin-Based Geopolymer Cements Using Sodium Waterglass from Rice Husk Ash and Waste Glass as Alternative Activators

Tchakouté, Hervé K.; Rüscher, Claus H.; Kong, Sakéo; Kamseu, Elie; Leonelli, Cristina

doi:10.1007/s12649-016-9653-7

Cited by 75 publications

(30 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The shift of these absorption bands could be ascribed to the reorganisation of the geopolymer network. The absorption band at 694 cm −1 can be attributed to the vibration band of quartz [32,33]. This is consistent with the X-ray patterns of the geopolymer cements, which show the reflection peaks of quartz.…”

Section: Structural Properties Of Geopolymer Cementssupporting

confidence: 77%

Microstructure and mechanical, physical and structural properties of sustainable lightweight metakaolin-based geopolymer cements and mortars employing rice husk

Riyap

Bewa

Banenzoué

et al. 2019

Journal of Asian Ceramic Societies

Self Cite

View full text Add to dashboard Cite

This work focuses on an in-depth investigation of the formation of pores in the structure of lightweight geopolymer cements and mortars using rice husk as a foaming agent. The hardener used in this study was sodium waterglass. Metakaolin was replaced by 0, 10, 20, 30 and 40 % by mass of husk and the obtained powders were used to produce lightweight geopolymer cements and mortars. The formation of pores in the lightweight geopolymer cements was monitored using X-ray diffractometry and infrared spectroscopy while those in the mortars were assessed using apparent density and compressive strength measurements, mercury intrusion porosimetry and optical and scanning electron microscopy. The values for the compressive strength and apparent density were in the ranges of 28.92-0.75 MPa and 1.88-1.70 g/cm 3 , respectively. The results indicated that the values for the compressive strength and apparent density of geopolymer mortars decreased while those of the cumulative pore volume increased with increases in the metakaolin replacement level. Stereomicroscopic and scanning electron microscopic images showed the presence of rice husk and fibres of rice husk, respectively, in the networks. It was found that rice husk can be used as a foaming agent for producing sustainable lightweight geopolymer mortars.

show abstract

Section: Structural Properties Of Geopolymer Cementssupporting

confidence: 77%

Microstructure and mechanical, physical and structural properties of sustainable lightweight metakaolin-based geopolymer cements and mortars employing rice husk

Riyap

Bewa

Banenzoué

et al. 2019

Journal of Asian Ceramic Societies

Self Cite

View full text Add to dashboard Cite

show abstract

“…Adding materials such as QZ and SF into the FA geopolymers can enhance the mechanical properties of the composite geopolymers at high temperature. Fine filler Researchers Tchakoute et al [76] Lahoti et al [77] Aygörmez et al [78] Duan et al [43] Duan et al [79] Rovnaník anď Safránková [53] Duan et al [60] Zhang et al [80] Roviello et al…”

Section: Chemical Compositionsmentioning

confidence: 99%

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Dai

Wang

2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Geopolymers are prepared by alkali solution-activated natural minerals or industrial waste materials, which have been widely used as new sustainable building and construction materials for their excellent thermal and mechanical properties. The thermal and mechanical properties of geopolymers at high temperature have attracted great attention from many researchers. However, there are few systematic works concerning these two issues. Therefore, this work reviewed the thermal and mechanical behaviors of geopolymers at high temperature. Firstly, the thermal properties of geopolymers in terms of mass loss, thermal expansion, and thermal conductivity after high temperature were explained. Secondly, the mechanical properties of residual compressive strength and stress-strain relationship of fly ash geopolymers and metakaolin geopolymers after high temperature were analyzed. Finally, the microstructure and mineralogical characteristics of geopolymers upon heating were interpreted according to the changes of microstructures and compositions. The results show that the thermal properties of geopolymers are superior to cement concrete. The geopolymers possess few mass loss and a low expansion ratio and thermal conductivity at high temperature. The thermal and mechanical properties of the geopolymers are usually closely related to the raw materials and the constituents of the geopolymers. Preparation and testing conditions can affect the mechanical properties of the geopolymers. The stress-strain curves of geopolymer are changed by the composition of geopolymers and the high temperature. The silicon-type fillers not only improve the thermal expansion of the geopolymers but also enhance mechanical properties of the geopolymers. But, they do not contribute to reducing the thermal conductivity. the different raw materials, aluminosilicate precursor and reinforcement materials, result in different geopolymer damage during the heating. However, phase transitions can occur during the process of heating regardless of the raw materials. The additional performance enhancements can be achieved by optimizing the paste formulation, adjusting the inner structure, changing the alkali type, and incorporating reinforcements.

show abstract

“…Nevertheless, hardening at elevated temperatures (above 100˚C) promotes the appearance of cracks and can negatively affect the properties of the geopolymer binder [9]. Metakaolin and rice husk ash were used as the main source of aluminosilicate material for the synthesis of geopolymer as in previous studies [10] [11]. In the present study, two alkaline solutions (NaOH/KOH) were additionally used as activator to investigate the influence of their nature on the properties of geopolymer binders.…”

Section: Introductionmentioning

confidence: 95%

Comparative Study on Geopolymer Binders Based on Two Alkaline Solutions (NaOH and KOH)

Sore¹,

Messan²,

Prud’Homme³

et al. 2020

JMMCE

View full text Add to dashboard Cite

This study specifically investigated the influence of the composition of aluminosilicate material i.e. the substitution of metakaolin by rice husk ash and the nature of alkaline activators (Na + /K +) on mineralogical, structural, physical and mechanical properties of geopolymer binders. This influence was evaluated based on X-ray diffraction (XRD), Fourier Transform InfraRed spectroscopy (FTIR) and Scanning Electron Microscope (SEM analyses, apparent density, water accessible porosity, compressive strength and thermal properties. Two types of geopolymer binder were synthesized according to the type of alkali activator used, the NaOH-based geopolymer and the KOH-based geopolymer. The results of characterization performed after 14 days of curing of geopolymer samples showed that the activation of the aluminosilicate powder using alkaline solution led to change in their microstructure. The highest compressive strength was obtained with the NaOH-based geopolymer.

show abstract

Thermal Behavior of Metakaolin-Based Geopolymer Cements Using Sodium Waterglass from Rice Husk Ash and Waste Glass as Alternative Activators

Cited by 75 publications

References 40 publications

Microstructure and mechanical, physical and structural properties of sustainable lightweight metakaolin-based geopolymer cements and mortars employing rice husk

Microstructure and mechanical, physical and structural properties of sustainable lightweight metakaolin-based geopolymer cements and mortars employing rice husk

Thermal and Mechanical Properties of Geopolymers Exposed to High Temperature: A Literature Review

Comparative Study on Geopolymer Binders Based on Two Alkaline Solutions (NaOH and KOH)

Contact Info

Product

Resources

About