The Influence of Temperature on the Hydration Rate of Cements Based on Calorimetric Measurements

Kiernożycki, W.; Błyszko, Jarosław

doi:10.3390/ma14113025

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…The results from isothermal calorimetry are summarized in Figure 6 and are consistent with published data elsewhere and data from cement manufacturers [1,32]. An asterisk signalizes a crack-resistant cement according to the 40-day criterion of the ring shrinkage test as described in Section 3.2.…”

Section: Isothermal Calorimetrysupporting

confidence: 85%

Crack-Resistant Cements under Drying: Results from Ring Shrinkage Tests and Multi-Physical Modeling

et al. 2022

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Cementitious materials exhibit shrinkage strain on drying, leading easily to crack formation when internally or externally restrained. It is known that cements with a slow strength gain show higher crack resistance under external drying. The ring shrinkage test can be considered an accelerated method for cracking tendency due to existing historical correlations between ring cracking time and long-term surface concrete cracking. The experimental campaign used ring shrinkage tests on 25 mortars, covering 10 commercial cements and 15 cements produced on demand, covering Portland cements and blended cements up to a 30% slag substitution. The results show that the restrained ring cracking time generally increases with lower Blaine fineness and higher slag substitution in 6 to over 207 days’ span. Upper limits for crack-resistant cements were proposed for 2-day compressive strength and Blaine fineness, in the case of Portland cements: 27.7 MPa and 290 m2/kg, respectively. A hygro-mechanical model successfully replicated strain evolution with crack formation and brittle failure. Only two out of ten commercial cements were classified as crack-resistant, while the ratio increased to 10 out of 15 cements which were produced on demand.

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Section: Isothermal Calorimetrysupporting

confidence: 85%

Crack-Resistant Cements under Drying: Results from Ring Shrinkage Tests and Multi-Physical Modeling

et al. 2022

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“…Nevertheless, recognizing all hydration stages, especially the acceleration and deceleration periods, corresponds to the highest strength development. Different authors have stated that portlandite crystals grow into the interstices of the clinker grains during the acceleration period [44][45][46][47]. The C-S-H forms around the silicate clinker surfaces and successively grows into the pore solution.…”

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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“…The selection of temperature control and crack prevention measures is mainly based on temperature field research on mass concrete structures [ 1 , 2 , 3 ]. The temperature field of mass concrete is affected by internal and external factors [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. Among them, the internal factors of hydration and heat release from cementitious material are the key factors.…”

Section: Introductionmentioning

confidence: 99%

“…The hydration rate of concrete is influenced by internal factors such as cementitious materials dosage and variety and particle size [ 6 , 7 , 8 ], admixture type and dosage [ 9 , 10 , 11 , 12 ], water-binder ratio [ 9 ], aggregate type and dosage [ 5 , 13 ], and admixtures [ 14 ], as well as external factors including initial concreting temperature and ambient temperature [ 15 , 16 , 17 ]. Studies have shown that the initial concreting temperature and the water-binder ratio are two important kinetic factors affecting the hydration rate of concrete [ 3 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, there have been many studies on the hydration rate of concrete at home and abroad. Freiesleben Hansen et al proposed the equivalent age based on hydration degree [ 18 ]; Zhang Ziming indicated that the effect of temperature on the hydration rate should be considered in the calculation of the equivalent age [ 19 ]; and the authors of [ 7 ] researched The Influence of Temperature on the Hydration Rate of Cements Based on Calorimetric Measurements , indicated that the hydration rate in relation to the curing temperature changes with the progression of hydration. The authors of [ 20 ] researched the early hydration process of three types of concrete with a mass ratio of water to binder of 0.4, including ordinary Portland cement concrete (OPC), concrete with fly ash of 30% (FAC), and concrete with silica fume of 5% (SFC).…”

Section: Introductionmentioning

confidence: 99%

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Influence Mechanism of Initial Concreting Temperature and Water-Binder Ratio on Hydration Rate of Fly Ash Concrete

Quan

Chen

et al. 2023

Materials

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The hydration exothermic rate of fly ash concrete is significantly affected by the initial concreting temperature and water-binder ratio. Firstly, the adiabatic temperature rise and temperature rise rate of fly ash concrete at different initial concreting temperatures and water-binder ratios were obtained by a thermal test instrument; then, the effects of initial concreting temperature and water-binder ratio on the hydration kinetic parameters of the NG-I-D hydration process of fly ash concrete were analyzed by the theory of hydration kinetics; lastly, the effects of initial concreting temperature and water-binder ratio on chemically bound water and pore bulk of fly ash concrete during hydration were analyzed by applying a thermogravimetric analyzer and industrial CT scanning techniques. The results showed that the increase in initial concreting temperature and the decrease in water-binder ratio accelerated the rate of temperature rise, and the initial concreting temperature had a more significant effect than the water-binder ratio. During the hydration reaction, the I process was significantly influenced by the initial concreting temperature, and the D process was significantly influenced by the water-binder ratio; the content of bound water increased with the increase in water-binder ratio and age and the decrease in initial concreting temperature. The initial temperature had a significant effect on the growth rate of 1 to 3 days bound water, and the water-binder ratio had a more significant effect on the growth rate of 3 to 7 days bound water. The porosity was positively correlated with the initial concreting temperature and water-binder ratio and decreased with age, but 1 to 3 days was the key period of porosity change. Additionally, the pore size was also influenced by the initial concreting temperature and water-binder ratio.

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The Influence of Temperature on the Hydration Rate of Cements Based on Calorimetric Measurements

Cited by 12 publications

References 21 publications

Crack-Resistant Cements under Drying: Results from Ring Shrinkage Tests and Multi-Physical Modeling

Crack-Resistant Cements under Drying: Results from Ring Shrinkage Tests and Multi-Physical Modeling

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

Influence Mechanism of Initial Concreting Temperature and Water-Binder Ratio on Hydration Rate of Fly Ash Concrete

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