Compressive and tensile strength fracture models for heavyweight geopolymer concrete

Hamidi, Fatemeh; Aslani, Farhad; Valizadeh, Afsaneh

doi:10.1016/j.engfracmech.2020.107023

Cited by 21 publications

(6 citation statements)

References 54 publications

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“…The microstructural investigation of high-calcium-based GPC indicated that both sodium aluminate silicate hydrate (N-A-S-H) and calcium aluminate silicate hydrate (C-A-S-H) gel are formed in high-calcium-based GPC [71]. This phenomenon is reported by other studies [71,83,84], where silica content, calcium content and aging conditions affect the phase transition behavior of fly-ash based GPC. Abdollahnejad et al [71] reported that the samples with higher molar ratio of Na/Ca achieved higher rates compared to other samples with molar ratio of Si/Al and Ca/Si in terms of gel formation at the ambient temperature (25 • C and 30% relative humidity).…”

Section: Effect Of Heat Treatment On Compressive Strength Of Gpc Samplessupporting

confidence: 63%

Comparative Study Involving Effect of Curing Regime on Elastic Modulus of Geopolymer Concrete

Azarsa

Gupta

2020

Buildings

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Geopolymer Concrete (GPC) as a cement-less construction material has attracted worldwide attention due to its lower carbon footprint. There are numerous studies reported on GPC made using different by-products including fly-ash. However, since the use of bottom-ash is comparatively limited, making potassium-based GPC using this waste can be an alternative to Portland Cement Concrete (PCC). In this study, two methods of accelerated curing were used to determine the influence of elevated temperature on the compressive strength of GPC, composed of 50% bottom-ash and 50% fly-ash. GPC specimens were cured using various temperatures including ambient, 30 °C, 45 °C, 60 °C, and 80 °C for 24 h, all followed by 28 days of ambient curing. The highest compressive strength was obtained with steam curing at a temperature of 80 °C for a duration of 24 h. It is of great significance to evaluate elastic modulus of the concrete mixture so that the short-term rigidity of structures subjected to elongation, bending, or compression can be predicted. In this study, a longitudinal Resonant Frequency Test (RFT) as a non-destructive test (NDT) was used to calculate the elastic modulus of both GPC and a comparative PCC mix. Based on the results, PCC had higher resonant frequency (by about 1000 Hz) compared to GPC. A review of empirical models for predicting GPC’s elastic modulus showed that all of the predicted elastic modulus values were lower than experimental values.

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Section: Effect Of Heat Treatment On Compressive Strength Of Gpc Samplessupporting

confidence: 63%

Comparative Study Involving Effect of Curing Regime on Elastic Modulus of Geopolymer Concrete

Azarsa

Gupta

2020

Buildings

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“…Ultimately, the strong structure gradually transitions from a unidirectional stress state to a triaxial tensile–compressive stress state (Figure a). Study revealed that the tensile strength of rock mass materials is about 1/10 of their compressive strength . Hence, a strong structure is more likely to fail under tension.…”

Section: Results Analysis and Discussionmentioning

confidence: 99%

“…Study revealed that the tensile strength of rock mass materials is about 1/10 of their compressive strength. 48 Hence, a strong structure is more likely to fail under tension. The strong structure will stretch when the tensile stress reaches the critical value of tensile damage, whereas it will undergo only a gradual transition from tensile shear damage to tensile damage if the critical value is not reached.…”

Section: Results Analysis and Discussionmentioning

confidence: 99%

Deformation and Failure Characteristics of Strong–Weak Coupling Structures with Different Height Ratios Under Cyclic Loading and Unloading

Chen,

Zhai,

et al. 2024

ACS Omega

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Strong−weak coupling outburst prevention technology can reduce the hazard of coal and gas outburst in mines based on hydraulic punching and grouting reinforcement. In this study, the mechanism of outburst hazards in the strong−weak coupling structure under mining disturbance was explored, and then cyclic loading and unloading experiments were performed on samples with different strong−weak height ratios (HRs) using the noncontact full-field strain testing (DIC) system and the acoustic emission (AE) system. The results show that the failure strength of the sample gradually increases with the increase in HR. The residual strain of the strong and weak structures undergoes three stages, i.e., the decelerated deformation, the constant-velocity deformation, and the accelerated deformation. Deformation mainly occurs in the weak structure and starts at the strong−weak interface. The AE signals present strong regional distribution characteristics and the Felicity effect, and the damage is concentrated near 70% of each stage in the cyclic loading process. As the HR rises, the weak structure transitions from brittle damage to ductile damage and from shear damage to tensile damage. In addition, due to the difference in Poisson effects of strong and weak structures, the strong structure transitions from a unidirectional stress state to a triaxial tensile−compressive stress state. When the HR increases to 85:15, the strong structure undergoes tensile damage.

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“…Relationship ACI 318 0,62 √fc' Waqas et al, 2021 [6] 0,25 (fc') 2/3 Hamidi, Aslani and Valizadeh, 2020 [7] 0,00026 ρ (fc') 0,24 Phoo-ngernkham et al, 2016 [8] 2,78 √fc' -13,95 Leemann and Hoffmann, 2005 [9] 0,11 (fc')…”

Section: Referencementioning

confidence: 99%

The ratio between flexural strength to compressive strength of geopolymer concrete

Evin,

Rachmansyah

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Building infrastructure always chooses to use strong materials, low costs, easy maintenance and easily available materials. One of these materials is normal concrete which is one of the normal concrete making materials using Portland cement. The process of making Portland cement can cause damage to the environment due to greenhouse emissions, so research is needed to create environmentally friendly concrete, one of which is geopolymer concrete. In geopolymer concrete there is still not too much research done when compared to normal concrete. In this study want to know the relationship between the compressive strength results and the flexural strength results in geopolymer concrete which is represented by a formula in the form of a ratio of the results of the two tests. The ratio obtained from the study will be compared with the ratio of ACI 318 0.62 fc ′ . The compressive strength test used a cylindrical specimen with a size of 15×30 cm and a flexural strength test used a beam-shaped test object with a size of 53×15×15 cm. The results of the research that have been carried out have obtained the ratio of compressive strength and flexural strength in geopolymer concrete 0.477 fc ′ where the ratio value is below the ratio set by ACI 318.

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Compressive and tensile strength fracture models for heavyweight geopolymer concrete

Cited by 21 publications

References 54 publications

Comparative Study Involving Effect of Curing Regime on Elastic Modulus of Geopolymer Concrete

Comparative Study Involving Effect of Curing Regime on Elastic Modulus of Geopolymer Concrete

Deformation and Failure Characteristics of Strong–Weak Coupling Structures with Different Height Ratios Under Cyclic Loading and Unloading

The ratio between flexural strength to compressive strength of geopolymer concrete

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