Effects of activator and aging process on the compressive strengths of alkali-activated glass inorganic binders

Chen, Tai An; Chen, Ji Hsien; Huang, Jong Shin

doi:10.1016/j.cemconcomp.2016.11.011

Cited by 21 publications

(15 citation statements)

References 30 publications

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“…This in turn bring out a higher amount of available free water in the pore structure which ultimately affects the performance of mortar. On the other hand, in alkali‐activated binders, the dissolution and polycondensation chemical reactions are affected by the concentration of alkali in the solution 45 . When the alkali content is less than 6.71%, the lower alkali concentration leads to the reduction of the amount of reaction products, which makes the internal structure of the mixture less dense.…”

Section: Optimizationmentioning

confidence: 99%

Application of response surface methodology to optimize alkali‐activated slag mortar with limestone powder and glass powder

Zhang

Zhai

2020

Structural Concrete

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An experimental and statistical investigation is carried out to analyze the influences of three variables (limestone powder, glass powder, and alkali content) on performance of alkali activated slag mortar. Response surface methodology (RSM) was used to model all measured responses like 28‐day flexural and compressive strength, water absorption, and dry shrinkage. Analysis of variance showed that all developed models were statistically significant. The interaction between the corresponding variables was analyzed using three‐dimensional response surface plots that were drawn using developed regression models. Optimization was performed using desirability approach of the RSM with an objective to maximize 28‐day flexural and compressive strength while minimizing water absorption and drying shrinkage. The optimum values of limestone powder, glass powder, and alkali content with highest desirability of 0.706 are 15.80, 17.02, and 6.71%, respectively. The predicted combination was validated by confirmatory tests and the error in prediction was found to be within 3.5%.

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Section: Optimizationmentioning

confidence: 99%

Application of response surface methodology to optimize alkali‐activated slag mortar with limestone powder and glass powder

Zhang

Zhai

2020

Structural Concrete

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“…Alkali activation technology offers the possibility to utilize large amounts of aluminosilicate-rich secondary products such as fly ash from thermoplants [1,2,3], slag from metallurgical processes [4,5] and waste glass [6] for a useful new group of building products. Steel slag-based alkali activated materials (AAM), have a high mechanical strength, show good fire resistance and high thermal resistance at elevated temperatures, and, in the case of low density, they further exhibit low thermal conductivity [7].…”

Section: Introductionmentioning

confidence: 99%

The Potential of Ladle Slag and Electric Arc Furnace Slag use in Synthesizing Alkali Activated Materials; the Influence of Curing on Mechanical Properties

et al. 2019

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Alkali activation is studied as a potential technology to produce a group of high performance building materials from industrial residues such as metallurgical slag. Namely, slags containing aluminate and silicate form a useful solid material when activated by an alkaline solution. The alkali-activated (AA) slag-based materials are promising alternative products for civil engineering sector and industrial purposes. In the present study the locally available electric arc furnace steel slag (Slag A) and the ladle furnace basic slag (Slag R) from different metallurgical industries in Slovenia were selected for alkali activation because of promising amorphous Al/Si rich content. Different mixtures of selected precursors were prepared in the Slag A/Slag R ratios 1/0, 3/1, 1/1, 1/3 and 0/1 and further activated with potassium silicate using an activator to slag ratio of 1:2 in order to select the optimal composition with respect to their mechanical properties. Bending strength of investigated samples ranged between 4 and 18 MPa, whereas compressive strength varied between 30 and 60 MPa. The optimal mixture (Slag A/Slag R = 1/1) was further used to study strength development under the influence of different curing temperatures at room temperature (R. T.), and in a heat-chamber at 50, 70 and 90 °C, and the effects of curing time for 1, 3, 7 and 28 days was furthermore studied. The influence of curing time at room temperature on the mechanical strength at an early age was found to be nearly linear. Further, it was shown that specimens cured at 70 °C for 3 days attained almost identical (bending/compressive) strength to those cured at room temperature for 28 days. Additionally, microstructure evaluation of input materials and samples cured under different conditions was performed by means of XRD, FTIR, SEM and mercury intrusion porosimetry (MIP).

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“…Christiansen discussed the influence of different types of glass and alkali activators on the properties of geopolymers [24]. Chen et al [25] proposed an aging process to make glass-based geopolymer, and its mechanical properties are equivalent to those without silicate solution. In addition, changing the curing conditions can also enhance the mechanical properties of glass-based geopolymers [26].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, changing the curing conditions can also enhance the mechanical properties of glass-based geopolymers [26]. This study uses waste glass as an activator to replace sodium silicate, which is expensive and environmentally unfriendly and is also based on Chen et al [25]; by changing the curing conditions under the optimal aging conditions to discuss if the adjustment of temperature and time during the curing stage can produce higher performance glass-based geopolymer. In addition, according to the study of concrete, its durability, bending strength, and shear strength are correlated to the compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of glass-based geopolymer affected by activator and curing conditions under the optimal aging conditions

Chen¹

2021

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Inorganic polymeric materials react slowly at room temperature and as a result usually require high-temperature curing. This study used the Arrhenius equation to analyze the correlation between curing temperature and curing duration during high-temperature curing. The test results show that optimal values exist for each alkali equivalent of the activator (weight ratio of Na2O/glass powder), curing temperature, and curing duration. Extending the curing duration and increasing the curing temperature have positive effects when the alkali equivalent is lower than the optimal value. However, over-curing results in invisible cracking in the specimens. Furthermore, despite exhibiting high strength initially, the strength of specimens gradually diminishes after standing in air. To ensure the durability of glass-based geopolymer, the curing temperature should not exceed 70℃, and the curing duration should be less than one day.

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Effects of activator and aging process on the compressive strengths of alkali-activated glass inorganic binders

Cited by 21 publications

References 30 publications

Application of response surface methodology to optimize alkali‐activated slag mortar with limestone powder and glass powder

Application of response surface methodology to optimize alkali‐activated slag mortar with limestone powder and glass powder

The Potential of Ladle Slag and Electric Arc Furnace Slag use in Synthesizing Alkali Activated Materials; the Influence of Curing on Mechanical Properties

Mechanical properties of glass-based geopolymer affected by activator and curing conditions under the optimal aging conditions

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