The hydration of fast setting spray binder versus (aluminum sulfate) accelerated OPC

Briendl, Lukas; Mittermayr, Florian; Röck, Rudolf; Steindl, Florian Roman; Sakoparnig, Marlene; Juhart, Joachim; Iranshahi, Fatemeh; Galán, Isabel Moratilla

doi:10.1617/s11527-022-01907-x

Cited by 10 publications

(4 citation statements)

References 51 publications

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“…Except for HCP, the temperature development at the beginning of hydration is similar but strikingly much higher for D800 and D1000, reaching more than ten times the one of OPC. The hydration levels of OPC are well known [36][37][38][39][40][41][42]. Therefore, the measured temperature curve of OPC corresponds to the generally known stages of hydration.…”

Section: Specific Surface Area Of the Powders And Heat Release During...mentioning

confidence: 99%

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

et al. 2023

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Cement is the strength-forming component of concrete. It has been a major building material for more than a century. However, its production is accountable for a considerable percentage of global CO2 emissions and is very energy-intensive. The Ordinary Portland Cement (OPC) production is a thermal process at around 1450 °C. This study shows that the reactivation of Hydrated Cement Powder (HCP) can be successful at a much lower temperature. Therefore, the possibility of using HCP to replace parts of OPC in concrete reduces the energy consumption and the CO2 emissions associated with OPC production. HCP, which may ultimately stem from recycled concrete, needs treatment to produce new concrete of the required mechanical strength. Using reactivated HCP in concrete, an optimum strength is achieved by heating the HCP in the range of 400–800 °C. Among other factors, the type of cement used influences the optimum heating temperature and attainable strength. This paper shows that 600 °C is an optimum heating temperature using the OPC type CEM I 52.5R. The crystalline phase transitions resulting from the thermal treatment were analyzed by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and thermogravimetry (TG). The heat released during hydration was investigated, and scanning electron microscopy (SEM) displays the microstructure evolution. OPC can be partially replaced by thermally treated HCP in mortar, attaining similar mechanical strength values.

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Section: Specific Surface Area Of the Powders And Heat Release During...mentioning

confidence: 99%

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

et al. 2023

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“…x > 1 (10) where σ and ε are the stress and strain of UHPSC, respectively, f c and ε c are the peak stress and corresponding strain value of UHPSC under uniaxial compression, α is the shape parameter of the model's ascending section and β is the shape parameter of the model's descending section. The derivative of x = 0 is obtained by taking the first-order derivative of the model's ascending section in Equations ( 8) and (9), and the calculation is as follows:…”

Section: Uniaxial Compressive Constitutive Modelmentioning

confidence: 99%

“…The α and β obtained from Equation ( 12) were substituted into Equation (10), and the stress-strain curves under different steel fiber content were obtained after finishing. The calculated stress-strain curves of UHPSC under uniaxial compression were compared with those measured in the test, as shown in Figure 8.…”

Section: Uniaxial Compressive Constitutive Modelmentioning

confidence: 99%

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Effects of Steel Fiber Content on Compressive Properties and Constitutive Relation of Ultra-High Performance Shotcrete (UHPSC)

Xiao,

Yang,

Liu

et al. 2024

Buildings

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Shotcrete is widely used in civil engineering as a supporting structure. In this paper, the compressive behavior of ultra-high-performance shotcrete (UHPSC) with different steel fiber content by volume (0, 0.5%, 0.75%, 1%, 1.25%, 1.5%) was investigated. The results showed that the failure pattern of UHPSC was changed from brittle failure to ductile failure with the increase in steel fiber content. The compressive strength, peak strain and compressive toughness of UHPSC increased with the increase in steel fiber content, but the elastic modulus and Poisson’s ratio did not change significantly. With content of 1.5% steel fibers, its axial compressive strength, peak strain and compressive strain energy were 122.7 MPa, 3749 με and 0.269 MPa, respectively, increased by 14%, 23.5% and 55.5% compared with those without steel fiber. The peak strain and compressive toughness were higher than that of ultra-high-performance concrete (UHPC), while the elastic modulus of UHPSC was lower than that of UHPC. Based on the experimental data, the relationship between compressive strength, peak strain, compressive toughness and the change in the characteristic value of steel fiber content (λf) were revealed. The uniaxial compressive constitutive model of UHPSC with different steel fiber content was established and reflected the change rule of the shape parameter of α (constitutive model ascending section) and β (constitutive model descending section) with λf. The experimental results were in good agreement with the model calculation results, which can provide theoretical support for the structural design of UHPSC.

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In situ pH monitoring in accelerated cement pastes

Briendl

Grengg

Müller

et al. 2022

Cement and Concrete Research

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The hydration of fast setting spray binder versus (aluminum sulfate) accelerated OPC

Cited by 10 publications

References 51 publications

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

Reactivation of hydrated cement powder by thermal treatment for partial replacement of ordinary portland cement

Effects of Steel Fiber Content on Compressive Properties and Constitutive Relation of Ultra-High Performance Shotcrete (UHPSC)

In situ pH monitoring in accelerated cement pastes

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