Ettringite Cements Its Potential | Feature | PNNL
Ettringite, a mineral found in cement, can latch on to and detain the wily and worrisome radioactive contaminant, pertechnetate.
Delayed ettringite formation — Processes and problems
The scope of the delayed ettringite formation (DEF) problem is reviewed. Based on the experience of the writer and others, DEF is to be expected in bo…
Materials | Free Full-Text | Relating Ettringite Formation and
With increasing ettringite content in the cement paste the effect of additionally formed ettringite on the workability of the cement paste is increased. The high water consumption and the formation of (low density) ettringite changes the water/solid ratio of the paste significantly and, thus, strongly controls the flow behavior of paste.
Delayed Ettringite Formation
Fig. 36 illustrates a SEM image confirming the presence of ettringite in the vicinity of acid-treated CNTs and carbon nanofibers (CNFs). Fig. 36. ... If hydration takes place at higher temperatures, through the use of steam curing of precast production or through self-heating in large pours, then ettringite is not formed. ...
(PDF) Quantitative analysis of ettringite formed in the …
This paper reports on the characterisation and quantitative analysis of ettringite in the hydration products of several high-alite cements. The study has three main parts: (a) the investigation of ...
Effects of ettringite seed on the hydration and properties of
The main reasons were that AFt seed speeded up the whole hydration progress via acting as the nucleation seed to promote the formation of ettringite phase in the pore gaps space among the particles rather than on the surface of slag, which could contribute to the further dissolution of slag and result in the production of C-(A)-S-H gel.
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SEM pictures of ettringite formation from a orthorhombic C …
Download scientific diagram | SEM pictures of ettringite formation from a orthorhombic C 3 A ? gypsum ? H 2 O mixture, at 7 and 14 days. w/s = 0.6 from publication: Analysis of cubic and ...
Ettringite
Ettringite structure can incorporate several ions at the calcium, aluminum, hydroxide, ... Fig. 4.7 shows the SEM pictures of the mortars at 28 days. ... thus approving the Nah end-member part. Fe is strongly correlated with Mg and Ca (if using a polynomial trend line), but not with Al, which may prove its divalent character. ...
Ettringite
Ettringite is a primary constituent of hydration of Portland cement concrete. Its formation plays an important role in the control of setting. Minor amounts of secondary ettringite are often encountered in air voids of hardened concretes, regardless of the type of cement used. This secondary ettringite, evidently developed in the walls of the ...
Novel Approach for Suppression of Ettringite Formation in …
The treatment of sulfate-bearing soil with calcium-based stabilizers such as cement or lime often results in ettringite formation, consequently leading to swelling and strength deterioration. Ettringite formation has negative environmental and economic effects on various civil engineering structures. This study was conducted to investigate …
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Delayed Ettringite Formation in Concrete
Ettringite in hardened concrete Scanning electron photomicrographs show that ettringite (3CaO ⋅ Al2O3⋅ 3CaSO4⋅ 32 H2O) occurs in concrete in various forms, often as …
Ettringite and monosulfate formation to reduce
Therefore, Ca(OH) 2 solubility-governed alkalinity production in hydrated steel slag can be altered by WTR-modification, shifting the control of Ca(II) and OH release from Ca(OH) 2 solubility to calcium sulfoaluminate phases, such as …
SEM pictures of ettringite formation from a cubic C 3 A
Download scientific diagram | SEM pictures of ettringite formation from a cubic C 3 A ? gypsum ? H 2 O mixture, at 7 and 14 days. w/s = 0.6 from publication: Analysis of cubic and orthorhombic C3A ...
Ettringite
Two gemmy and lustrous, beautifully intergrown, V-shaped, sulfur-yellow ettringite crystals aesthetically set on manganese ore matrix from the famous N'Chwaning II Mine of South …
Ettringite Cements Its Potential | Feature | PNNL
Researchers have identified a process that makes it possible for a mineral in cement—ettringite—to incorporate and hold the radioactive contaminant pertechnetate.
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Delayed Ettringite Formation: Causes, Effects, and Prevention
Delayed Ettringite Formation, commonly abbreviated as DEF, is a chemical reaction that occurs in hardened concrete. It involves the formation of ettringite, a …
Impact of ettringite seeding on hydration, strength and …
At about 144 h, the hydration of NSAS reaches the acceleration stage, due to the rapid production of ettringite and C-(A)-S-H gel, and then the exothermic rate becomes slow at almost 220 h till stable period. Download: Download high-res image (622KB) Download: Download full-size image; Fig. 11. Hydration heat release of NSAS …
Delayed ettringite formation
Delayed ettringite formation (DEF) can damage concrete that has experienced a temperature above about 70°C. Claims that slow release of sulfate from t…
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Buildings | Free Full-Text | Effect of Calcium Aluminate and …
The mechanism for enhancing the early compressive strength of the CA-CS-SSC system is attributed to the swift hydration of CA with anhydrite, dissolution of fine slag particles, and reaction with anhydrite under conditions with suitable alkali content to augment the ettringite production.
Unlocking the potential of ordinary Portland cement with
Increasing ettringite content improves packing of the hardened cement, resulting in ~50% higher specific strength and enabling cement reduction.
Comparative kinetics study on carbonation of ettringite …
The use of ettringite-based materials for thermochemical heat energy storage has attracted researchers' attention in recent years since ettringite has advantages like low material cost and high energy storage density (~500 kWh/m 3).However, carbonation, which modifies its structure and reduces the capacity of energy storage, is …
Ettringite Formation and the Performance of Concrete
Ettringite (white, needle-like crystals) are commonly found in samples taken from concrete in service, especially in concrete from moist environments. Secondary …
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Kinetic and thermal decomposition of ettringite synthesized …
The kinetics of the thermal decomposition of a synthetic ettringite sample was studied between 298 and 820 K in an inert atmosphere for the present work. The ettringite and its thermal decomposition products were characterized using X-ray diffraction, infrared spectroscopy, and scanning electron microscopy. Four endothermic …