The hydration mechanism of cement-based materials served in marine environment during early-age magnesium precipitation

Li, Xiaosheng; Shui, Zhonghe; Sun, Tao; Liu, Kaizhi; Wang, Xi

doi:10.1016/j.conbuildmat.2019.117010

Cited by 9 publications

(4 citation statements)

References 59 publications

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“…Similar mineral and textural sequences were observed in the crystalline crusts precipitated at the air-water interface of the alkaline spring systems of Oman [24]. In fact, similar aragonite-brucite sequences are very common in the crack pieces of self-healed Portland cement concrete exposed to seawater [5,6,28].…”

Section: Growth Eventssupporting

confidence: 59%

“…Brucite is also found as weathering product of cement-based materials, resulting from the dissolution and reprecipitation of ions from the cement past and pore waters, especially in marine exposure [4][5][6]. Brucite, in these cases, use to form layered precipitates, frequently intermixed with other mineral phases (i.e., calcite, aragonite, and ettringite) filling cracks in the concrete mass.…”

Section: Introductionmentioning

confidence: 99%

“…These fillings can close totally or partially the initial fracture, making difficult the ingress of aggressive substances and improving the durability of the structure. Self-healing mechanisms in cementitious materials can be promoted using suitable healing agents [7]; however, sometimes it occurs spontaneously without previous design in an autogenetic self-healing [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Brucite-Aragonite Precipitates as Weathering Products of Historic Non-MgO-Based Geomaterials

et al. 2020

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This paper analyses the mineralogical composition, texture, and structure of a stalactite sampled from the city-wall storerooms of the Nueva Tabarca fortress (southeast Spain). This speleothem presents an uncommon mineral assemblage: aragonite, brucite, gypsum, silica, and halite. Internally, it shows complex structure: (1) a central soda-straw composed by aragonite; (2) an external puff-pastry cone-crust formed preferentially by aragonite and brucite; and (3) an internal branching of coralloids, showing a subtle layering between brucite and aragonite. Gypsum, halite, and silica locate in the outer coating of the cone-crust. The sequent mineral precipitation sequence has been established: aragonite > brucite > gypsum/silica > halite. Speleothem formation is directly related to the chemical weathering of the rocks and mortars used as building materials of the city-wall. Brucite precipitates has been always linked to the presence of MgO-based geomaterials. However, the lack of these compounds as building materials in Nueva Tabarca fortress makes this investigation a unique example of brucite precipitation. PHREEQC calculations showed that interaction between pore waters and the minerals of mortar aggregates (dolomite, pyroxene, and amphibole) leads to rich-magnesium solutions. Evaporation modelling of lixiviated waters describes the precipitation of the mineral assemblage of the brucite-aragonite speleothems.

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Section: Growth Eventssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Brucite-Aragonite Precipitates as Weathering Products of Historic Non-MgO-Based Geomaterials

et al. 2020

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“…Nevertheless, at 3 and 7 d, an increment of 18% and 12.5% was obtained, respectively, when using carbonated water for the NA mixture and CC regime. When kneading cement and water, the pH increases rapidly, and this solution becomes saturated with Ca(OH) 2 after 24 h [ 73 , 74 ]. Furthermore, the calcite phase found in NA ( Figure 2 ) can act as a buffer when added to carbonated water, as observed by Lippiatt et al [ 5 ] to achieve simultaneous hydration and carbonation in cement.…”

Section: Resultsmentioning

confidence: 99%

Use of Carbonated Water as Kneading in Mortars Made with Recycled Aggregates

2022

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The increased concern about climate change is revolutionising the building materials sector, making sustainability and environmental friendliness increasingly important. This study evaluates the feasibility of incorporating recycled masonry aggregate (construction and demolition waste) in porous cement-based materials using carbonated water in mixing followed (or not) by curing in a CO2 atmosphere. The use of carbonated water can be very revolutionary in cement-based materials, as it allows hydration and carbonation to occur simultaneously. Calcite and portlandite in the recycled masonry aggregate and act as a buffer for the low-pH carbonated water. Carbonated water produced better mechanical properties and increased accessible water porosity and dry bulk density. The same behaviour was observed with natural aggregates. Carbonated water results in an interlaced shape of carbonate ettringite (needles) and fills the microcracks in the recycled masonry aggregate. Curing in CO2 together with the use of carbonated water (concomitantly) is not beneficial. This study provides innovative solutions for a circular economy in the construction sector using carbonated water in mixing (adsorbing CO2), which is very revolutionary as it allows carbonation to be applied to in-situ products.

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A study on the salt attack performance of magnesium oxychloride cement in different salt environments

Huang

Zheng

Xiao

et al. 2022

Construction and Building Materials

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The hydration mechanism of cement-based materials served in marine environment during early-age magnesium precipitation

Cited by 9 publications

References 59 publications

Brucite-Aragonite Precipitates as Weathering Products of Historic Non-MgO-Based Geomaterials

Brucite-Aragonite Precipitates as Weathering Products of Historic Non-MgO-Based Geomaterials

Use of Carbonated Water as Kneading in Mortars Made with Recycled Aggregates

A study on the salt attack performance of magnesium oxychloride cement in different salt environments

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