A Comparative Study Between the Early Stages Hydration of a High Strength and Sulphate Resistant Portland Cement and the Type II F Portland Cement Through Non Conventional Differential Thermal Analysis and Thermogravimetry

Neves, Alex; Viana, Marcelo Mendes; Dweck, Jo; Filho, Romildo Dias Toledo

doi:10.1590/1516-1439.373714

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…The pozzolanic reaction can be compared to the hydration of Portland cement since both reactions lead to the formation of calcium silicate hydrate (CSH). Both CSH and CAH from pozzolanic reaction contribute to the compressive strength of the blended cement mortars [ 40 , 84 , 85 , 86 , 87 ]. The higher compressive strength in OPC samples could be attributed to the fact that OPC contained a higher proportion of C 3 S and C 2 S that are mainly responsible for the strength development.…”

Section: Resultsmentioning

confidence: 99%

Properties of activated blended cement containing high content of calcined clay

Marangu

Karanja

Muthengia

2018

Heliyon

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This paper presents findings of an experimental investigation on sodium sulphate (Na2SO4) activated calcined clay – Portland cement blends in sulphuric acid media. Calcined clays were blended with Ordinary Portland Cement (OPC) at replacement levels of 40% 45% and 50 % by mass of OPC to make blended cement labelled PCC40, PCC45 and PCC50 respectively. Initially, pozzolanicity and setting time tests were conducted. Mortar prisms measuring 40 mm × 40 mm × 160 mm were cast using 0.5M Na2SO4 solution and their compressive strengths determined on the 2nd, 7th, 28th and 90 th day of curing. The 28th day cured mortar prisms were subjected to porosity test. Moreover, 5 × 5 × 5 cm mortar cubes were also prepared and their weight and strength loss was taken as a measure of their acid resistivity after an immersion time of 7, 14, 28, 56, 84 and 120 days in 3 % of sulphuric acid at 23 ± 1 °C. OPC, commercial Portland Pozzolana Cement (PPC) and PCC40, PCC45 and PCC50 cement were cast using water and similarly investigated for comparison purposes. The results obtained showed that chemically activated cements exhibited higher pozzolanic activity, lower porosity, shorter setting times and higher resistance to acid attack compared to non-activated cements. However, OPC was found to be non-pozzolanic.

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Section: Resultsmentioning

confidence: 99%

Properties of activated blended cement containing high content of calcined clay

Marangu

Karanja

Muthengia

2018

Heliyon

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Evaluation of the rheological behavior, hydration process, and mechanical strength of Portland cement pastes produced with carbon nanotubes synthesized directly on clinker

Souza

Pinto

Cruz

et al. 2020

Construction and Building Materials

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Evaluation of Influence of Salt in the Cement Hydration to Oil Wells

et al. 2018

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The influence of NaCl salt in the hydration of the Portland cement paste class G was studied using a Non Conventional Differential Thermal Analysis (NCDTA) on the first 24 hours of cement hydration. The mass of salt used corresponds to 0, 5, 10, 15 and 20% of mass of water used in the preparation of the pastes. The water/cement ratio (w/c) remained constant, being 0.46, and the pastes final volume was 99.9mL. Applying a deconvolution method to separate overlapped NCDTA peaks it was possible to estimate the energy released during the different stages of hydration and the effect of salt in cement hydration process. The presence of up to 10% of salt accelerated the hydration process and increased the hydration of C 3 S and C 3 A, while the 20% of the salt causes a delayed hydration and decreased the hydration of C 3 S and C 3 A. Futhermore, cement pastes with the same percentages of NaCl and with different hydration times were evaluated by Thermogravimetry (TG), Derivative Thermogravimetry (DTG) and Differential Thermal Analysis (DTA). After 28 days the presence of salt caused a greater increase in the formation of hydrated products.

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A Comparative Study Between the Early Stages Hydration of a High Strength and Sulphate Resistant Portland Cement and the Type II F Portland Cement Through Non Conventional Differential Thermal Analysis and Thermogravimetry

Cited by 3 publications

References 9 publications

Properties of activated blended cement containing high content of calcined clay

Properties of activated blended cement containing high content of calcined clay

Evaluation of the rheological behavior, hydration process, and mechanical strength of Portland cement pastes produced with carbon nanotubes synthesized directly on clinker

Evaluation of Influence of Salt in the Cement Hydration to Oil Wells

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