The effect of water binder ratio on strength development of class C fly ash geopolymer mortar prepared by dry geopolymer powder

Wardhono, Arie

doi:10.1051/matecconf/201925805032

Cited by 7 publications

(3 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The change in pore structure caused by different water contents is the main reason for the decrease in compressive strength. Although the workability is increased, the increase of additional water leads to too much water evaporating, leading to the higher porosity of specimens 20 . In Figure 4, the peak of the curve shifts to the right as the liquid–solid ratio increases, meaning the expansion of the adsorption average pore diameter (0.46 = 11.5289 nm, 0.54 = 15.5513 nm, 0.62 = 18.3569 nm).…”

Section: Resultsmentioning

confidence: 98%

Calcium‐activated geopolymer ceramics: Study of powder calcination and amorphous gel phases

et al. 2023

View full text Add to dashboard Cite

Burnt coal cinder (BCC), the main solid waste in coal and electric power industries was used to prepare the geopolymer ceramics (GC) in this study. The optimum preparation technology of BCC-based GC and the effects of calcination and calcification on the compressive strength of BCC-based GC were studied. Through the calcification of BCC with CaO, NaAlO 2 and sodium silicate solution (SS) were separately used as the co-activator and silica additive to prepare BCC-based GC. The optimal single-factor conditions determined by the experiment were BCC:CaO:NaAlO 2 :SS = 18:3:2:4 (g:g:g:mL) and the liquid-solid ratio was 0.46. The compressive strength of BCC-based GC was 32.78 MPa (28 days). It was obtained that the calcination of calcified BCC below the temperature of 1000 • C can effectively remove the fixed carbon in BCC but will destroy amorphous active aluminosilicate. The microstructure study showed that BCC reacted in the ternary system of Ca-Al-Si to form a variety of amorphous products (C-(A)-S-H and (N, C) -A-S-H). Along with the three-dimensional amorphous gel structure as the dominant phase, the coexistence and interlacing of various amorphous gels made the microstructure more compact and increased the compressive strength of the BCC-based GC. GCs with various amorphous phases have been successfully prepared at low temperature, and it also provided a new idea for the utilization of low-activity silicate solid wastes.

show abstract

Section: Resultsmentioning

confidence: 98%

Calcium‐activated geopolymer ceramics: Study of powder calcination and amorphous gel phases

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Sodium hydroxide (NaOH) and sodium silicate (Na 2 SiO 3 ) were used as alkali activators [38][39][40]. Activators are substances or elements that cause other elements to react [5,41].…”

Section: Alkali Activatormentioning

confidence: 99%

Manufacture of Geopolymer Artificial Aggregates by Pelletization and Crushing Processes

Adhitya¹,

Saggaff²,

Saloma³

et al. 2023

cea

View full text Add to dashboard Cite

Aggregates are an important ingredient of concrete. They are of two types: coarse aggregates and fine aggregates. The supply of natural aggregates on Earth is declining with technological advancement, hence, alternatives to natural aggregates are needed. Artificial aggregates have been manufactured using a coal burning waste, i.e. fly ash. On mixing fly ash with an alkaline activator, the mixture reacts and hardens. Aggregates are manufactured either by mixing materials using a granulator pan or by crushing materials using a stone crusher. The optimal manufacturing method was determined by comparing physical properties, such as bulk specific gravity, water absorption, and aggregate hardness, of the aggregates manufactured using these two methods with those of natural coarse aggregates. The average bulk specific gravity was 1.776 and 1.857 for the aggregates produced by the pelletization and crushing processes, respectively, and 2.957 for the natural aggregates. The average water absorption values were 11.62% and 8.37% for the aggregates produced by the pelletization and crushing processes, respectively, and 4.17% for the natural aggregates. The average aggregate hardness values, determined using the Los Angeles abrasion test, were 27.33% and 25.98% for aggregates produced by the pelletization and crushing processes, respectively, and 24.05% for the natural aggregates.

show abstract

“…Various studies have found that an S/L ratio around 0.8 provided an optimal mechanical strength while retaining satisfactory workability [17][18][19]. Similarly, a W/B ratio below 0.55 is often used to attain high-strength geopolymers [20][21][22][23]. In this work, geopolymers with W/B ratios between 0.75 and 0.95 were designed (Table 2).…”

Section: Design Of Recipementioning

confidence: 99%

Strength and Microstructure Characteristics of Metakaolin-Based Geopolymer Mortars with High Water-to-Binder Ratios

2022

View full text Add to dashboard Cite

Geopolymers and other alkali-activated materials were investigated in detail as alternatives to ordinary Portland cement because of their reduced CO2 emissions, high (radionuclide) binding capacities, and low permeabilities. The last two properties make them potential materials for the immobilization of several types of chemical waste. In this context, the direct immobilization of liquid waste streams would be a useful application. This study aimed to develop geopolymers with high water-to-binder ratios, but with good mechanical strengths, while elucidating the parameters that dictate the strengths. Three potential metakaolin geopolymer recipes were cast and cured for 28 days, after which their strengths, mineralogy, and microstructures were determined. The results show that it is possible to attain acceptable mechanical strengths at water-to-binder ratios that vary from 0.75 to 0.95, which is a significant increase from the ratio of 0.55 that is commonly used in the literature. It was found that the most important parameter that governs the mechanical strength is the dilution of the activating solution, which is represented by the H2O/Na2O ratio, while the microstructure was found to benefit from a high SiO2/Al2O3 ratio.

show abstract

The effect of water binder ratio on strength development of class C fly ash geopolymer mortar prepared by dry geopolymer powder

Cited by 7 publications

References 12 publications

Calcium‐activated geopolymer ceramics: Study of powder calcination and amorphous gel phases

Calcium‐activated geopolymer ceramics: Study of powder calcination and amorphous gel phases

Manufacture of Geopolymer Artificial Aggregates by Pelletization and Crushing Processes

Strength and Microstructure Characteristics of Metakaolin-Based Geopolymer Mortars with High Water-to-Binder Ratios

Contact Info

Product

Resources

About