Measurement and Prediction of Heat of Hydration of Portland Cement Using Isothermal Conduction Calorimetry

Sedaghat, Ahmadreza; Zayed, A.; Sandberg, Paul

doi:10.1520/jte20120272

Cited by 17 publications

(9 citation statements)

References 9 publications

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“…Isothermal conduction calorimetry (TA instrument, TAM-air, New Castle, DE, USA) was conducted to evaluate the effects of GO, CNTs, GO/FCNTs mixture, and GNFG on the hydration process of the cement paste at an early stage (72 h) [ 60 ]. According to the w/c ratio, the cement, nanomaterials, SP, and water were mixed to a total mass of 5 g. The aqueous solution containing the nanomaterials was sonicated before mixing with the cement.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons–Functionalized Carbon Nanotubes–Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites

Liu

Her

et al. 2021

Nanomaterials

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In this study, a graphene oxide nanoribbons–functionalized carbon nanotubes–graphene oxide (GNFG) complex was hydrothermally synthesized as a nanomaterial for reinforcing cementitious composites, using a modified Hummers’ method. Three types of components existed in the GNFG: Type I, the functionalized carbon nanotubes–graphene oxide nanoribbons (FCNTs–GNR); and types II and III are graphene oxide (GO) and functionalized carbon nanotubes (FCNTs), respectively, which exist independently. The dispersivity of GNFG and its effects on the mechanical properties, hydration process, and microstructures of cement pastes were evaluated, and the results were compared with those using cement pastes incorporating other typical carbon nanomaterials. The results demonstrated that dispersion of GNFG in aqueous solutions was superior to that of the CNTs, FCNTs, and GO/FCNTs mixture. Furthermore, the highly-dispersed GNFG (0.05 wt.%) improved the mechanical properties of the cement paste after 28 days of hydration and promoted the hydration of cement compared to CNTs, GO, and GO/FCNTs mixture (0.05 wt.%). The results in this study validated the feasibility of using GNFG with enhanced dispersion as a new nano-reinforcing agent for various cementitious systems.

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Section: Methodsmentioning

confidence: 99%

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons–Functionalized Carbon Nanotubes–Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites

Liu

Her

et al. 2021

Nanomaterials

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“…After mixing using a mechanical agitator, 10 g of the paste was removed and added to an ampoule. This was then put it in the calorimeter as quickly as possible [23].…”

Section: Methodsmentioning

confidence: 99%

Hydration and Microstructure of Cement Pastes with Calcined Hwangtoh Clay

et al. 2019

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Calcined Hwangtoh (HT) clay is a very promising supplementary cementitious material (SCM). In this work, the development of the mechanical properties and microstructures of HT-blended cement paste was studied after substituting the binder with HT powder calcined at 800 °C. The water-to-binder (w/b) ratios of the paste used were 0.2 and 0.5, and the quantities of HT powder added to the mixture were 0, 10, and 20%. The compressive strength test indicates that the addition of the HT powder increases the compressive strength of the paste after seven days of curing, and the highest compressive strength is obtained with the 10% HT substitution, regardless of whether the w/b ratio is 0.5 or 0.2. X-ray fluorescence (XRF), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), isothermal calorimetry, thermogravimetric analysis (TGA), and attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) analysis show that the HT powder not only has a physical effect (i.e., nucleation effect and dilution effect) on cement hydration but also has a chemical effect (i.e., chemical reaction of HT). The results of scanning electron microscopy (SEM) and mercury intrusion porosimetry (MIP) analysis show that the paste has more ettringite during the early stage, and the microstructure is refined after the addition of the HT powder. In addition, the relationships between chemically bound water, hydration heat, and compressive strength are presented.

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“…This stems from the hypothesis that the performance of cementitious systems could be predicted by monitoring the generated heat during hydration, which can be measured by a calorimeter [18]. Therefore, the heat of hydration, which is the integral of the heat production rate (thermal power) in a hydration process, is very essential for investigating hydration rates, variation in temperature changes within the cementitious binder composition, and classification of binder compositions based on their reactivity [19,20]. Some thermochemical approaches have been used to evaluate the hydration kinetics of Portland cement [18,21,22].…”

Section: Introductionmentioning

confidence: 99%

Optimization of MgO-GGBS Cementitious Systems Using Thermo-Chemical Approaches

2021

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The current study investigated the development of a sustainable thermo-chemical approach to effectively optimize MgO-waste activated GGBS formulations, using four types of magnesium oxide (MgO) waste materials with ground granulated blast-furnace slag (GGBS) to develop binary cementitious systems (MgO-GGBS). This stems from the expected complexity of cementitious binder optimization outcomes into a simpler analytic form, enhancing the rapid delivery of optimization results and contributing to the global awareness of sustainable approaches and use of industrial wastes. Three levels of Portland cement by weight (90, 80, and 70 wt.%) was replaced with MgO wastes including an industrial by-product (GGBS) to develop an experimental regime. Investigation was carried out by employing an experiment-based optimisation technique (thermo-chemical approach), which involved the design of an experimental regime and application of experimental tests (pH measurements, thermogravimetric and derivative thermogravimetric analysis—TG/DTG and isothermal calorimetry), establishment of design variable/parameters, measurement of the design performance of the identified design parameters, and review of the relationship between the independent (control) and dependent variables (MgO wastes and their compositions). The experimental test results successfully optimised the binder compositions, established the best performing binder system (MG1), and provided an in-depth insight into the thermal stability and hydration kinetics of the investigated binder systems.

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Measurement and Prediction of Heat of Hydration of Portland Cement Using Isothermal Conduction Calorimetry

Cited by 17 publications

References 9 publications

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons–Functionalized Carbon Nanotubes–Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites

Synthesis of Highly-Dispersed Graphene Oxide Nanoribbons–Functionalized Carbon Nanotubes–Graphene Oxide (GNFG) Complex and Its Application in Enhancing the Mechanical Properties of Cementitious Composites

Hydration and Microstructure of Cement Pastes with Calcined Hwangtoh Clay

Optimization of MgO-GGBS Cementitious Systems Using Thermo-Chemical Approaches

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