Fresh, Mechanical, and Durability Behavior of Fly Ash-Based Self Compacted Geopolymer Concrete: Effect of Slag Content and Various Curing Conditions

Sherwani, Aryan Far H.; Younis, Khaleel H.; Arndt, Ralf W.

doi:10.3390/polym14153209

Cited by 19 publications

(6 citation statements)

References 85 publications

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“…The substitution of slag with FA thus improves the initial setting time of geopolymer paste [18]. It was reported that the inclusion of slag leads to the reduction of the fresh state properties of SCGC, whilst improving the hardened state properties [19].…”

Section: Introductionmentioning

confidence: 99%

Performance of Self-Compacted Geopolymer Concrete Containing Fly Ash and Slag as Binders

et al. 2022

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Geopolymers can replace cement and help reduce the environmental impact of concrete construction, but research is needed to ensure their mechanical properties, durability and practicability. The aim of this investigation is to examine the influence of ground granulated blast furnace slag (slag) content on the performance, at the fresh and hardened states, of fly ash (FA) based self-compacted geopolymer concrete (SCGC). For this purpose, four SCGC mixtures containing 450 kg/m3 of total binder were examined. The alkaline-to-binder ratio was 0.5 for all mixes. FA was substituted with slag at 0%, 30%, 50%, and 100% of the total binder content. The fresh properties in terms of flowability, passing ability, viscosity, and segregation resistance, as well as the mechanical properties in terms of compressive strength and splitting tensile strength, were quantified. The durability behavior of SCGC was also studied to determine sorptivity and long-term free drying shrinkage. The results confirm that slag adversely affects the workability of SCGC mixtures except for the resistance to sieve segregation. Performance of SCGC in hardened states is in general enhanced with slag inclusion but at increased shrinkage strain. Predictions of splitting tensile strength were made using the ACI 318, ACI 363, Eurocode CEB-FIB, and Lee and Lee models. The ACI 363 and Eurocode CEB-FIB models were found to be inaccurate, except for the 30% slag mix. Predicted values obtained from the Lee and Lee model were very close to the actual values of the FA-based SCGC mix. The results of this work could lead to more sustainable concretes using geopolymers instead of OPC.

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Section: Introductionmentioning

confidence: 99%

Performance of Self-Compacted Geopolymer Concrete Containing Fly Ash and Slag as Binders

et al. 2022

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“…The GP cube samples were then examined for any concrete damage. The materials were weighed and their compressive strength was estimated [10,14,15].…”

Section: Salt Water Exposurementioning

confidence: 99%

“…Experiments are undertaken to establish the durability level of concrete under different types of strength, which are dependent on the proportion of OPC in GPC. The sample trial was separated into two groups, one with GPC cured at room temperature and the other with GPC cured at 60°C for 24 hours [10,15,20]. Figure 1 shows the weight difference between the concrete before and after hydration.…”

Section: Durability Of Gpcmentioning

confidence: 99%

Durability Performance of Geopolymer Concrete of Various Strength

Meechang

Muthuramalingam

Tam

2023

Civil Sustain. Urban Eng.

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Geopolymers, primarily composed of fly ash, have proved an excellent substitute for ordinary portland cement (OPC) in terms of sustainability and productivity. In order to determine the geopolymer concrete's (GPC) resistance to chemical assaults and water permeability, it is necessary to obtain geopolymer concrete (GPC) of varying strengths after normal curing. The objectives of the research was to test the durability performances of the GPC of various strength under normal curing and investigating the optimum strength based on durability testing of the GPC. For this research, different type of cement-to-fly ash ratio was used for various strength data. The appropriate mixture was conducted by using the trial mix method in order to obtain better accuracy of the results data during the mixing design process. To satisfy the varied strength designs, a small proportion of OPC is added to the GPC mixture as part of the mix design. After 28 days of curing, this durability testing is undertaken after the concrete has reached its maximum strength. The compressive strength test and weights were performed and compared to the GPC mix design at 60 °C after heat curing. The 8% OPC replacement has greater resistance to sulfate attack, saltwater exposure, and water permeability compared to the 6% and 7% OPC alternatives. Consequently, the experiment reveals that the GPC's durability and strength increase as the percentage of OPC increases.

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“…In addition, the energy consumption for the production of geopolymer concrete is greatly decreased. For example, compared with ordinary Portland cement concrete with the same strength, the energy consumption of fly ash-based geopolymer concrete is reduced by 70% [ 17 ]. The comparison of energy consumption and CO 2 emissions of ordinary Portland cement and geopolymer is shown in Figure 1 [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fiber on the Mechanical Properties of Geopolymer Concrete: A Review

et al. 2023

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Geopolymer is widely used as a supplement to cementitious composites because of its advantages of low carbon and environmental protection, and geopolymer concrete is also broadly used in practical engineering. In recent years, geopolymer concrete has attracted increasing interest owing to its superior mechanical properties, and a series of research results have been obtained. In this paper, from the preparation of geopolymer concrete, based on the characteristics that geopolymer concrete is brittle and easy to crack, the types and basic properties of fibers to enhance the toughness of concrete are analyzed, the advantages and disadvantages of different fibers used as a material to enhance the toughness of concrete are summarized, and we review the effects of type, shape, volume rate, aspect ratio, and hybrid fiber combinations on the static mechanical properties. The results indicate that fibers have significant potential to enhance the compressive strength, splitting tensile strength, flexural strength, and fracture toughness of geopolymer concrete, and the optimal fiber volume rate seems to be related to the fiber type. Whereas the effect of aspect ratio and hybrid fiber combinations on the properties of geopolymer concrete seems to be obvious. This paper reviews the influence of fiber on the basic mechanical properties of geopolymer concrete, which provides a solid foundation to promote the further development and application of the research on the toughness of fiber-reinforced geopolymer concrete and provides recommendations for future research.

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Fresh, Mechanical, and Durability Behavior of Fly Ash-Based Self Compacted Geopolymer Concrete: Effect of Slag Content and Various Curing Conditions

Cited by 19 publications

References 85 publications

Performance of Self-Compacted Geopolymer Concrete Containing Fly Ash and Slag as Binders

Performance of Self-Compacted Geopolymer Concrete Containing Fly Ash and Slag as Binders

Durability Performance of Geopolymer Concrete of Various Strength

The Influence of Fiber on the Mechanical Properties of Geopolymer Concrete: A Review

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