Flexural Strength of Low Calcium Class F Fly Ash-Based Geopolymer Concrete in Long Term Performance

Wardhono, Arie; Law, David W.; Molyneaux, T

doi:10.4028/www.scientific.net/msf.841.104

Cited by 5 publications

(3 citation statements)

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“…In Figure 7 the regression formulation of the experimental results is also reported in the form f c f = k( f cm ) α , that seems the efficient approach for OPC. The improved flexural performance of about 60% of geopolymer concrete with respect to the ACI prediction was acknowledged also by Warhono et al [87]. These results depend on the stronger connection between geopolymer binder and aggregate.…”

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confidence: 56%

Experimental Evaluation of the Mechanical Strengths and the Thermal Conductivity of GGBFS and Silica Fume Based Alkali-Activated Concrete

Parcesepe

Masi

Lima³

et al. 2021

Materials

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Alkali-activated concrete (AAC) could be a solution to use a cement-less binder and recycled materials for producing concrete reducing the carbon dioxide emission and the demand for raw materials, respectively. In addition to the environmental aspect, AACs can achieve mechanical characteristics higher than those of ordinary Portland concrete (OPC) but also an improvement of the thermal insulation capacity. Despite the positive results available in the scientific literature, the use of AACs in construction practice is still limited mainly due to the absence of codification for the mix design and consequently of specific design rules. In this paper, AAC produced by ground-granulated blast-furnace slag (GGBFS) and silica fume is investigated for the production of structural elements and to discuss the reliability of formulations for evaluating mechanical properties, necessary for structural design. The mechanical strengths (compression strength, tensile strength, flexural strength) are evaluated by experimental tests according to different curing times (7, 14, 28, 90 days) in ambient conditions and the thermal conductivity is measured to understand the effect that the material could have on thermal losses for a sustainable building perspective. The results showed that AAC strengths depend on the curing time and the exposure conditions, and the insulation properties can be improved compared to the traditional Portland cement with the proposed composition.

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confidence: 56%

Experimental Evaluation of the Mechanical Strengths and the Thermal Conductivity of GGBFS and Silica Fume Based Alkali-Activated Concrete

Parcesepe

Masi

Lima³

et al. 2021

Materials

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“…The results concluded that molarity affected compressive strength [7,8,9,10]. In geopolymer mortar production, a treatment method is very important, such as the heating technique, which helps to polymerize the material's paste [11,12,13,14].…”

Section: Introductionmentioning

confidence: 99%

Determination of Geopolymer Mortar Characterization Using Fly Ash and Pumice Sand

Sultan¹

2022

GEOMATE

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The cement-making process is one of the highest contributors to atmospheric CO2 levels, leading to wide consideration and analysis of alternative cement substitutes. One of the materials widely used as a substitute is fly ash, whose properties are similar to cement. It is also abundant in nature due to the combustion of coal furnaces at the Rum Steam Power Plant. Therefore, this study aims to determine the effect of heating in the geopolymer mortar treatment process. The test object was a cube mortar containing a mixture of cement, fly ash, water, and an activator, with dimensions of 5 ×5 ×5 cm 3 . The utilized Class-C fly ash also had a calcium content above 10%. In this process, the specimens produced were then heated in an oven for 24 h at temperatures of 20°C, 40°C, 60°C, 80°C, and 100°C. This heating process emphasized the determination of the best temperature responsible for the production of maximum compressive strength in geopolymer mortar. Based on the results, higher heating temperatures led to better compressive strength. This indicated that the 8M and 10M geopolymer mortar produced compressive strength of 17.60 and 18.60 MPa at 100°C heating, respectively. In addition, higher molarity provided better compressive strength in geopolymer mortar.

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“…The production of 1 ton PC produces approximately 0.7-1 ton of carbon dioxide (CO2) gas emissions which lead to the global warming problem [4][5][6]. The use of fly ash as fully cement replacement material in geopolymer is an alternative to overcome this issue [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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

Wardhono

2019

MATEC Web Conf.

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The use of geopolymer binder as cement replacement material can reduce the amount of carbon dioxide gas produced during the Portland Cement manufacturing process. However, the main issue of geopolymer binder is in the mixing process of sodium silicate and NaOH which requires specialized knowledge and strict supervision. This paper reports the effect of water binder ratio on strength development of fly ash geopolymer mortar using dry geopolymer powder. Fly ash with high calcium content was used as primary material. The dry geopolymer powder was prepared by wet mixing method which was made by drying a mixture of NaOH solution and limestone for 24 hours. The variations of water to binder ratio were 0.30, 0.35, 0.40, 0.45, and 0.50. Strength properties were measured by compressive strength at the age of 7, 14 and 28 days. The results showed that the water binder ratio significantly affect the strength development of geopolymer mortar prepared by dry geopolymer powder. The water binder ratio of 0.40 gives the highest compressive strength of 10.3 MPa at 28 days. This suggests that the use of dry geopolymer powder on geopolymer mortar production can overcome the difficulties of geopolymer mortar mixing on site.

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Flexural Strength of Low Calcium Class F Fly Ash-Based Geopolymer Concrete in Long Term Performance

Cited by 5 publications

References 0 publications

Experimental Evaluation of the Mechanical Strengths and the Thermal Conductivity of GGBFS and Silica Fume Based Alkali-Activated Concrete

Experimental Evaluation of the Mechanical Strengths and the Thermal Conductivity of GGBFS and Silica Fume Based Alkali-Activated Concrete

Determination of Geopolymer Mortar Characterization Using Fly Ash and Pumice Sand

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

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