Unified modeling of setting and strength development

Pinto, Roberto Caldas de Andrade; Schindler, A.

doi:10.1016/j.cemconres.2009.08.010

Cited by 29 publications

(19 citation statements)

References 11 publications

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“…The activation energy values determined as per ASTM C1074 (2004) from mortar cube testing performed in Phase II-Task 2 of this project as listed in Table 5.5 were used. The strength activation energy values for all mixture are greater than those obtained from isothermal calorimetry, which is in agreement with the findings ofPinto and Schindler (2010).…”

Section: Early-age Compressive Strength Developmentsupporting

confidence: 82%

“…Although the initial and final set times at each curing temperature varied significantly, the calculated equivalent ages did not, as shown in Figure 1.6. This was also confirmed by Wade et al (2010), Weakley (2010), and Pinto and Schindler (2010). The setting times may be estimated for a given mixture at varying placement conditions if the apparent activation energy, temperature history, and equivalent ages at setting are known.…”

Section: Ultimate Degree Of Hydrationsupporting

confidence: 62%

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Increased Use of Fly Ash in Hydraulic Cement Concrete (HCC) for Pavement Layers and Transportation Structures

Varga¹,

Bentz²,

Weiss³

et al. 2012

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Section: Early-age Compressive Strength Developmentsupporting

confidence: 82%

Section: Ultimate Degree Of Hydrationsupporting

confidence: 62%

Increased Use of Fly Ash in Hydraulic Cement Concrete (HCC) for Pavement Layers and Transportation Structures

Varga¹,

Bentz²,

Weiss³

et al. 2012

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“…However, the value of S u under variable temperature was not clearly identified, which would lead to additional hard task to obtain straightforwardly the strength development at a specified age. Pinto and Schindler (2010) proposed an extended maturity approach to unify the distinctly different temperature sensitivities before setting and during the hardening period of concrete, based on the Arrhenius maturity function. The effect of different activation energies on the strength-maturity relationship was taken into account, as summarized in Table 6.…”

Section: Review Of Existing Modelsmentioning

confidence: 99%

“…For this reason, the use of high-strength concrete (HSC) has been gradually encouraged for the fast-track construction of nuclear facility structures, especially in South Korea. The strength development of HSC is more sensitive to the curing temperature than normal-strength concrete (NSC) because the hydration rate of cement is greater at a lower water-cementitious materials ratio and a higher curing temperature (Kim et al 2002a;Pinto and Schindler 2010). As a result, the strengthmaturity models established from the NSC test data using standard cylinders are frequently pointed out to overestimate the in situ strength of HSC, particularly under a cold temperature at an early age (Parsons and Naik 1985;Hulshizer 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The setting times, rate constants, and apparent activation energies of the prepared mixtures were also measured in accordance with ASTM procedures (2011) in order to calculate the equivalent age based on the Arrhenius function. The measured core strength was compared with the companion cylinder strength and estimates obtained from different maturity approaches (Kim et al 2002a;Pinto and Schindler 2010;Yang 2014). …”

Section: Introductionmentioning

confidence: 99%

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Comparison of Strength–Maturity Models Accounting for Hydration Heat in Massive Walls

Yang

Mun

Kim

et al. 2016

Int J Concr Struct Mater

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The objective of this study was to evaluate the capability of different strength-maturity models to account for the effect of the hydration heat on the in-place strength development of high-strength concrete specifically developed for nuclear facility structures under various ambient curing temperatures. To simulate the primary containment-vessel of a nuclear reactor, three 1200-mm-thick wall specimens were prepared and stored under isothermal conditions of approximately 5°C (cold temperature), 20°C (reference temperature), and 35°C (hot temperature). The in situ compressive strengths of the mock-up walls were measured using cores drilled from the walls and compared with strengths estimated from various strength-maturity models considering the internal temperature rise owing to the hydration heat. The test results showed the initial apparent activation energies at the hardening phase were approximately 2 times higher than the apparent activation energies until the final setting. The differences between core strengths and field-cured cylinder strengths became more notable at early ages and with the decrease in the ambient curing temperature. The strength-maturity model proposed by Yang provides better reliability in estimating in situ strength of concrete than that of Kim et al. and Pinto and Schindler.Keywords: high-strength concrete, in situ strength, mock-up, hydration heat, maturity, curing temperature. List of Symbols

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Prediction of early compressive strength of mortars at different curing temperature and relative humidity by a modified maturity method

Sun

Noguchi

Cai

et al. 2020

Structural Concrete

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This paper presents an experimental and modeling study on the influence of curing temperature (T) and relative humidity (RH) on the development of early‐age compressive strength of cement mortars. By introducing an RH factor γRH into the age conversion factor of concrete, a modified maturity function was proposed considering both effects of T and RH on the mechanical properties of mortars. Test results proved that T and RH both had a considerable effect on the compressive strength of mortars, especially at the later stage of curing. The RH factor γRH increased as curing RH of mortars, and decreased with their curing age when the mortars were under an unsaturated state. The results also show that the factor γRH could be formulated by a modified hyperbola function. With the proposed RH modified maturity function, the prediction of compressive strength was verified having a high consistency with the experimental results.

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Unified modeling of setting and strength development

Cited by 29 publications

References 11 publications

Increased Use of Fly Ash in Hydraulic Cement Concrete (HCC) for Pavement Layers and Transportation Structures

Increased Use of Fly Ash in Hydraulic Cement Concrete (HCC) for Pavement Layers and Transportation Structures

Comparison of Strength–Maturity Models Accounting for Hydration Heat in Massive Walls

Prediction of early compressive strength of mortars at different curing temperature and relative humidity by a modified maturity method

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