Very high strength (120MPa) class F fly ash geopolymer mortar activated at different NaOH amount, heat curing temperature and heat curing duration

Atiş, Cengiz Duran; Görür, Ela Bahşude; Karahan, Okan; Bilim, Cahit; İlkentapar, Serhan; Luga, Erion

doi:10.1016/j.conbuildmat.2015.08.089

Cited by 273 publications

(125 citation statements)

References 26 publications

Supporting

Mentioning

104

Contrasting

Unclassified

Order By: Relevance

“…The mechanical strengths reported in the published literature varied widely owing to the differences in raw materials (e.g., attribute and recipe), curing condition (e.g., temperature and moisture) and sample preparation technology (e.g., size and age). The 28 days compressive strengths of the geopolymer obtained from literature survey, including low-and high-calcium AAS geopolymers in addition to SAP geopolymers, are shown in Figure 6 (Davidovits, 2011;Chindaprasirt et al, 2012Chindaprasirt et al, , 2013bNath and Kumar, 2013;Nematollahi and Sanjayan, 2014;Atiş et al, 2015;Guo et al, 2016;He et al, 2016;Reddy et al, 2016;Wang et al, 2016;Wang, 2018). Clearly, the statistics showed that the compressive strengths of the AAS geopolymer (i.e., 15-65 MPa for low-calcium series and 70-110 MPa for high-calcium series) significantly outperformed that of the SAP geopolymer (i.e., 10-50 MPa).…”

Section: Compressive Strengthmentioning

confidence: 99%

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

2019

View full text Add to dashboard Cite

Chemically activated materials (often termed as geopolymer) have received attracting attentions in civil, material and environmental research fields as a toolkit alternative to traditional Portland cement in specific applications. This paper presents a comparative review on silico-aluminophosphate (SAP) geopolymers in terms of definition, chemistries involved during geopolymerization, mechanical performance, durability, environmental impacts, and their potentials in applications relative to conventional alkali-aluminosilicate (AAS) geopolymers. Recommendations for future applications are also highlighted. It is found that S-A-P gels with six-coordinated aluminum environment dominate in SAP geopolymers, while the aluminum in N-A-S-H gels formed in the AAS geopolymers is characterized by four-coordinated features. Besides, the slow performance development of SAP geopolymer matrix under ambient temperature curing can be compensated through incorporating additional countermeasures (e.g., metal sources) which allow the tailored design of such geopolymers for certain in-situ applications. Generally, the calcium-bearing C-(A)-S-H gels co-existing with N-A-S-H gels are dominant in AAS geopolymers, while the S-A-P gels enhanced by phosphate-containing crystalline/amorphous phases are the main products in SAP geopolymers. The SAP geopolymers show their environmental friendliness relative to the AAS geopolymers due to the utilization of phosphate activators that require lower production energy relative to silicate-containing activators. However, the higher cost of phosphate activators may confine the applications of SAP geopolymers in some exquisite or special fields.

show abstract

Section: Compressive Strengthmentioning

confidence: 99%

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

2019

View full text Add to dashboard Cite

show abstract

“…Several investigations have demonstrated the efficiency of using thermal approach for different alkali-activated binders in order to enhance the compressive strength (Kim and Kim 2013;Atis et al 2015;Ming et al 2016). Abdollahnejad et al showed that using a thermal approach with the temperature of 60 0 C for three hours enhanced the strength of alkali activated cements, therefore, similar thermal methodology was adopted here in this study (Abdollahnejad et al 2017).…”

Section: Specimen Synthesis and Ageingmentioning

confidence: 99%

Development of One-Part Alkali-Activated Ceramic/Slag Binders Containing Recycled Ceramic Aggregates

Abdollahnejad

Luukkonen

Mastali

et al. 2019

J. Mater. Civ. Eng.

View full text Add to dashboard Cite

Alkali-activated binders have received a great attention due to their excellent potential in enabling the reuse and recycling of industrial solid wastes and by-products. One-part or "just add water" alkali-activated binders are an approach to reduce the negative aspects of using alkali solution during the preparation of the traditional two-part alkali activated binders. The work aimed to utilize the maximum content of ceramic wastes in alkali-activated blast-furnace slag/ceramic binders.The ground granulated blast-furnace slag was partially replaced (10%, 20%, and 30% in wt.%) by two types of ceramic wastes (porcelain and raw; i.e., fired and unfired). Moreover, coarse particle size of porcelain ceramic waste was used as recycled aggregate. The specimens were cured under two different curing regimes: 1) sealing with plastic; 2) using thermal curing conditions for 3 hours in 60°C after demolding and then sealing until the test day. Mechanical testing and microstructural analysis were used to characterize the effects of different curing regimes and different ceramic sources. The results showed that replacing ground granulated blast furnace slag with all types of ceramic wastes reduced the compressive strength, which this reduction was mainly caused by reduction of the calcium content. This strength loss was also governed by the ceramic waste type, curing regime type, and curing duration. The microstructural analysis indicated that some cracks were formed between the ceramic waste particles and the matrix.Moreover, the microscopic analysis indicated the use of pre-heating could eliminate cracking.

show abstract

“…Geopoly- * corresponding author; e-mail: ukockal@yahoo.com merisation is often referred as alkali activation. It transforms the amorphous ingredients of materials into a composite that has strong binding property [14].…”

Section: Introductionmentioning

confidence: 99%

Physical and Mechanical Properties of Silica Fume and Calcium Hydroxide Based Geopolymers

2017

View full text Add to dashboard Cite

Conventional portland cement has found worldwide usage in the production of cementitious materials in recent years. Nevertheless, environmental problems such as high demand of raw materials, energy consumption and high amount of carbon dioxide emission take place before and during manufacturing process. The attempts have been made to seek alternative binders and develop supplementary materials for construction sector. Therefore, this study reports the results of an experimental program on the comparison of geopolymers with different compositions in terms of evaluating their physical and mechanical behavior. For that purpose, the effect of binder types and amount of binders and alkali activator (sodium hydroxide) was investigated. In addition, acidic pumice and waste aluminium particles were also used as fine aggregate and air entraining agent, respectively, in geopolymer production. The test results revealed that as the content of alkali activator increased, compressive and flexural strength decreased. Addition of waste aluminium particles decreased bulk density and strength owing to the some extent of entrained air.

show abstract

Very high strength (120MPa) class F fly ash geopolymer mortar activated at different NaOH amount, heat curing temperature and heat curing duration

Cited by 273 publications

References 26 publications

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

Silico-Aluminophosphate and Alkali-Aluminosilicate Geopolymers: A Comparative Review

Development of One-Part Alkali-Activated Ceramic/Slag Binders Containing Recycled Ceramic Aggregates

Physical and Mechanical Properties of Silica Fume and Calcium Hydroxide Based Geopolymers

Contact Info

Product

Resources

About