Special Cements

Líška, Martin; Wilson, Alex; Bensted, J.

doi:10.1016/b978-0-08-100773-0.00013-7

Cited by 16 publications

(5 citation statements)

References 154 publications

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“…)/b will be faster reached. This value may correspond to 0.24 (complete hydration of cement [ 92 ]). However, this should be subject to more targeted and rigorous experiments.…”

Section: Resultsmentioning

confidence: 99%

Concept of Evaluation of Mineral Additives’ Effect on Cement Pastes’ Durability and Environmental Suitability

2021

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This experimental study focuses on the assessment of mineral additives and their incorporation into cement composites (CC). The assessment was based on a holistic approach to the performance of the durability properties of CC. Environmental suitability was also taken into consideration. In the experiments, cement pastes with w/c ratios of 0.3, 0.4, and 0.5, respectively, were prepared. Natural zeolite (NZ) and densified silica fume (SF) at doses of 7.5 and 15.0 wt.% of cement were used as the investigated (replacement) materials. Their effects (including development over time) on density, strength (flexural and compressive), porosity by water absorption, permeability by rapid chloride penetration (RCP) test, phase content by thermal analysis, and hydration progression, were observed. The results were then used to propose an evaluation approach. Natural zeolite was used for its known pozzolanic activity and classification as a supplementary cementitious material (SCM). In contrast SF acted as a filler in cement pastes, and thus did not have a direct positive effect on durability. The concept of comprehensive analysis for unknown additive classification is proposed to expressly differentiate between SCM, inert, and improving mineral additive. This concept could be applied to the assessment of mineral additives with regards to the durability and suitability of cement composites.

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“…)/b will be faster reached. This value may correspond to 0.24 (complete hydration of cement [ 92 ]). However, this should be subject to more targeted and rigorous experiments.…”

Section: Resultsmentioning

confidence: 99%

Concept of Evaluation of Mineral Additives’ Effect on Cement Pastes’ Durability and Environmental Suitability

2021

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show abstract

“…When bentonite is pre-hydrated in the mixed water before adding cement, its extension efficiency improves substantially. A slurry containing 2 % prehydrated bentonite BWOC is comparable to one with 8 % dry-blended bentonite [32]. Compared to an identical density slurry made by dryblended bentonite, pre-hydrated bentonite has no discernible effect on the ultimate compressive strength.…”

Section: Tablementioning

confidence: 91%

Oil-well lightweight cement slurry for improving compressive strength and hydration rate in low-temperature conditions

Mozaffari

Rahmani

Piroozian

et al. 2022

Construction and Building Materials

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“…Brucite and magnesite (MgCO 3 ) are the thermodynamically stable phases at low and high CO 2 concentrations, respectively. However, the formation of magnesite is kinetically hindered at ambient conditions, and it requires elevated temperature and pressure and instead forms a range of HMCs [55]. This is attributed to the high hydrating nature of Mg atoms with 6 coordinated water molecules surrounding Mg 2+ [56] ).…”

Section: Effect Of Acetate On Carbonationmentioning

confidence: 99%

“…This is attributed to the high hydrating nature of Mg atoms with 6 coordinated water molecules surrounding Mg 2+ [56] ). Which phase predominantly forms depends mainly on temperature and CO 2 pressure, however, various other factors such as pH or water activity have also been reported to be relevant [55].…”

Section: Effect Of Acetate On Carbonationmentioning

confidence: 99%

Role of Magnesium Acetate in Hydration and Carbonation of Magnesium Oxide-Based Cements

Ilango

Nguyen

German³

et al. 2023

Preprint

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Special Cements

Cited by 16 publications

References 154 publications

Concept of Evaluation of Mineral Additives’ Effect on Cement Pastes’ Durability and Environmental Suitability

Concept of Evaluation of Mineral Additives’ Effect on Cement Pastes’ Durability and Environmental Suitability

Oil-well lightweight cement slurry for improving compressive strength and hydration rate in low-temperature conditions

Role of Magnesium Acetate in Hydration and Carbonation of Magnesium Oxide-Based Cements

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