Mineralogical Analysis of Portland Cement Pastes Rehydrated

Santos, Tiago Assunção; Silva, Guilherme Augusto de Oliveira e; Ribeiro, Daniel Véras

doi:10.5276/jswtm/2020.15

Cited by 8 publications

(3 citation statements)

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“…At this point, free water emanating from C-S-H was also observable [62]. Another significant peak around 750 • C can be attributed to the decomposition or decarbonization of CaCO 3 (Calcite) [63]. Notably, the DTA and TGA profiles indicated a relatively higher C-S-H decomposition in T20 compared to T0 (the reference mortar) at 100 • C, present in both mixes.…”

Section: Ftirmentioning

confidence: 92%

Enhancing Mortar Properties through Thermoactivated Recycled Concrete Cement

Getachew,

Yifru,

Taffese

et al. 2023

Buildings

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The effects of thermoactivated recycled concrete cement (TARC) on mortar as a partial replacement for cement was examined. TARC is derived from concrete waste through a series of processes. Different mortar mixtures were tested, ranging from 0% to 50% TARC in 10% increments. A comprehensive range of tests was conducted to assess the properties of the mortar, including fresh, mechanical, microstructure, and durability evaluations. The fresh test indicated that the incorporation of TARC impacted the flow of mortar, leading to reduced workability as the percentage of replacement increased. Regarding mechanical performance, using 20% TARC resulted in improved compressive strength, bulk density, and ultrasonic pulse velocity (UPV). Microstructural analysis using thermogravimetry, scanning electron microscopy, and Fourier transform infrared spectroscopy (FTIR) revealed that the TARC mix exhibited advantageous thermal properties, enhanced FTIR spectra, and a denser microstructure, thereby enhancing the durability of the mortar. Overall, substituting OPC with TARC significantly reduces the carbon footprint associated with cement production, promoting sustainability and contributing to a circular economy in the construction industry.

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Section: Ftirmentioning

confidence: 92%

Enhancing Mortar Properties through Thermoactivated Recycled Concrete Cement

Getachew,

Yifru,

Taffese

et al. 2023

Buildings

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“…Vicat apparatus was used to determine the pastes' water consistency by ASTM: C191 [21]. The compressive strength of three cubic pastes representing the same binder pastes and curing time was measured according to ASTM C-150 [18,22], and the average result was recorded.…”

Section: Methods Of Investigationmentioning

confidence: 99%

Synergetic effect of cement kiln flue dust for enhancing physico-mechanical properties of metakaolin-blended cement

Ismail

Gharieb²,

Sultan³

et al. 2023

Egypt. J. Chem.

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As a result of the increasing impact of cement kiln flue dust on human health and the environment. In this study, cement kiln flue dust was used as an alkaline activator for mixed cement made from ordinary Portland cement (OPC) and metakaolin (MK).In the first part of the research, thedifferent proportions of cement and metakaolin were studied to obtain the bestblended mixes. Various ratios of metakaolin were substituted for MK (5, 10, 15, 20, and 25 %) to obtain the best ratio between OPC and MK.Incorporation of cement kiln flue dust in 15MK mix by different weight ratios (2, 4, 6, 8, and 10%) as a partial substitution ratio from OPC ratio was investigated to improve the pozzolanic activity of MK, especially at early ages of hydration.To realization investigate the effect of cement kiln flue dust on MK cement binder, classical tests of setting times and strength at various ages. The results were analyzed by using advanced devices. The results indicated that the MK has a positive effect on the physicomechanical properties of cement. The 15MK mix exhibited the best results regarding the physicochemicalof hardened cement paste, especially at later ages of hydration. The compressive strength of the 15MK mix increased by about 23.53% compared with the neat OPC at 28 days of hydration. Based on the physicochemical and mechanical measurement, the incorporation of 6% CKFD with 15 % MK in blended cement paste improved the physicomechanical properties of the hardened cement by the formation of calcium silicate hydrate and reduces Ca (OH) 2 to lower limits and reduces the waste results from the cement industry.

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“…The total weight losses observed at this stage are 1.80 and 2.55% for, respectively, composition 1 and composition 4. Santos et al [52] reported that the complete decomposition of ettringite takes place around the temperature range of (90-100) • C, while C-S-H in gel form decomposes within the temperature range of (200-450) • C. However, scientists [53][54][55] reported a wider range of decomposition temperatures for analyzed compounds. permitted temperature increase.…”

Section: Analysis Of the Thermal Stabilitymentioning

confidence: 99%

Evaluation of the Effect of the Composition of the Foam Glass Concrete on Its Flammability and Moisture Characteristics

Šeputytė-Jucikė,

Vėjelis,

Vaitkus

et al. 2024

J. Compos. Sci.

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The purpose of this study was to evaluate the moisture and flammability characteristics of lightweight concrete with different aggregates and different amounts of cement according to different criteria. The moisture properties of the specimens were evaluated by the coefficient of water absorption due to capillary action, short-term water absorption, and water vapour permeability. Short-term water absorption correlated with the density of the specimens, and capillary absorption was evaluated depending on the soaking time, amount of cement, and type of lightweight aggregate. The values of the water vapour diffusion resistance factor were estimated based on the amount of cement, the type of lightweight aggregate, the density, and the porosity. The porosity correlated with the amount of cement and the type of lightweight aggregate. The flammability properties of concrete with lightweight aggregate were evaluated by several methods, such as the single flame source test, the single burning item test, and the non-combustibility test. After assessing the flammability characteristics, a structure analysis of the samples was specifically performed to assess the processes that occur during the combustion of lightweight concrete. It was found that short-term water absorption depended mainly on the density, capillary absorption on the amount of cement, and the water vapour diffusion resistance factor, flammability, and thermal stability of lightweight concrete on the type of granules.

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Mineralogical Analysis of Portland Cement Pastes Rehydrated

Cited by 8 publications

References 0 publications

Enhancing Mortar Properties through Thermoactivated Recycled Concrete Cement

Enhancing Mortar Properties through Thermoactivated Recycled Concrete Cement

Synergetic effect of cement kiln flue dust for enhancing physico-mechanical properties of metakaolin-blended cement

Evaluation of the Effect of the Composition of the Foam Glass Concrete on Its Flammability and Moisture Characteristics

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