A review on properties of fresh and hardened geopolymer mortar

Zhang, Peng; Zheng, Ying‐Ying; Wang, Kejin; Zhang, Jinping

doi:10.1016/j.compositesb.2018.06.031

Cited by 335 publications

(119 citation statements)

References 88 publications

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“…The most commonly used chemical activators are alkali hydroxide/silicate solutions or a combination of both. The chemical structure of fly ash geopolymers is similar to that of the zeolite except they are amorphous [27]. Geopolymerisation models have been proposed by Fernandez-Jimenez et al [30] and Duxson et al [31].…”

Section: Introductionmentioning

confidence: 94%

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Resistance of fly ash geopolymer binders to organic acids

2020

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Fly ash geopolymers are a relatively new class of binders with the potential to reduce the CO2 emissions associated with Portland cement based construction materials. This paper reports on the organic acid resistance of fly ash geopolymers following exposure to acetic and lactic acid. Organic acids are prevalent in many circumstances including agriculture, production processes and waste management. These findings demonstrate that the surface of fly ash geopolymers had superior resistance to organic acids when compared with traditional Portland cement, evidenced by smaller mass losses. This was attributed to the formation of reaction products which were less susceptible to acid attack than those formed in Portland cement systems due to their lower calcium content. However, despite the surface of fly ash geopolymers appearing less deteriorated due to organic acid attack, they were found to have a higher porosity than their Portland cement counterparts making them more susceptible to acid ingress.

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Section: Introductionmentioning

confidence: 94%

“…Fly ash geopolymers are ceramic-like materials produced by the chemical activation of an aluminosilicate source such as fly ash with alkali to form a hardened binder [25][26][27][28][29]. The most commonly used chemical activators are alkali hydroxide/silicate solutions or a combination of both.…”

Section: Introductionmentioning

confidence: 99%

Resistance of fly ash geopolymer binders to organic acids

2020

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“…Geopolymers (GP) are considered a valid and sustainable alternative to OPC as they show properties suitable for diverse applications in construction [9][10][11] such as a fast setting time, low volumetric shrinkage, outstanding mechanical performance, and high resistance to chemicals and ageing [10][11][12][13][14][15]. Additionally, GP manufacture is highly cost-effective and simple, and is claimed to generate lower CO 2 emissions than OPC [16,17].…”

Section: Introductionmentioning

confidence: 99%

Innovative Recycling of Lime Slaker Grits from Paper-Pulp Industry Reused as Aggregate in Ambient Cured Biomass Fly Ash-Based Geopolymers for Sustainable Construction Material

et al. 2019

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Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-pulp industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1–12.5 mm, as provided by the industry) were reused as aggregate. Aggregate granulometry was also completed by using a commercial natural siliceous sand (<1 mm). Mortars using sand only were prepared for comparative reasons. The implemented mix was designed to investigate the influence of the grits on the mortar’s properties such as its binder/aggregate ratio, workability, bulk density, water sorptivity, and compressive strength. At the same time, waste reuse was analysed in light of its limitations and potentialities. Moreover, in the pursuit of sustainability, the manufacturing process that was followed was highly cost-effective in ambient curing conditions (20 °C, 65% RH), which avoided the use of any external source of energy as commonly used in geopolymers processing. The achieved results proved that the combined use of these wastes, which to date has hardly been explored, along with ambient manufacturing conditions increases the material sustainability. The produced mortars are suitable for innovative applications in various fields, with a particular focus on construction and contribute to the circular economy.

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“…As shown in figure 8 compressive strength of the geopolymer mortar increases with solid content of sodium hydroxide to binder ratio increasing from 0.35 to 0.59, whereas there is an decreasing tendency in compressive strength with water / binder ratio rising from 0.5 to 0.9 [9]. At steady activator to binder ratio and lime extent, expanding solid to binder proportion means expanding molarity of activator, and different specialists found that the molarity of basic arrangement affects the quality of geopolymer binder [10], [11]. observed, which demonstrates that no delaying alkaline is formed even in 16 Molarity.…”

Section: A Compressive Strengthmentioning

confidence: 99%

Influence of Activator on the strength of Ultra Fine Natural Steatite Powder based on Geopolymer Mortar

Premkumar¹,

Chokkalingam²,

Shanmugasundaram³

2019

IJEAT

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In this study the detailed analysis was made on alkali activated ultra fine natural steatite powder (UFNSP) mortars. The activating alkali was prepared through sodium hydroxide and sodium silicate with different molarities concentration of NaOH. The molarities of NaoH are various from 8, 10, 12, 14 and 16. The proportion of sodium hydroxide and sodium silicate proportion are fixed 1:2.5. Further the strength gained was accelerated through polyvinyl alcohol [PVA]. And various water binder ratio of 0.5, 0.6, 0.7, 0.8 and 0.9 with addition of PVA. For workability purpose super plasticizer was used, here Poly carboxylic ether was used as a superplasticizer. These various ratios concentration of alkali activators were tried on compressive strength of polymer mortar and the results were discussed. The watched outcomes demonstrate that, increment in sodium hydroxide content in soluble base fluid expands the strength. Exhibit the outcome was effect of Si/Al proportion on compressive strength of the specimen with various water binder proportions. In general, the study shows that integrating low ratio of Si/Al content in UFNSP with PVA can fetch low binding property on alkali activator UFNSP material.

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A review on properties of fresh and hardened geopolymer mortar

Cited by 335 publications

References 88 publications

Resistance of fly ash geopolymer binders to organic acids

Resistance of fly ash geopolymer binders to organic acids

Innovative Recycling of Lime Slaker Grits from Paper-Pulp Industry Reused as Aggregate in Ambient Cured Biomass Fly Ash-Based Geopolymers for Sustainable Construction Material

Influence of Activator on the strength of Ultra Fine Natural Steatite Powder based on Geopolymer Mortar

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