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Phase-selective degree of hydration at setting: An in situ synchrotron diffraction study
(Elsevier, 2022-03)
Setting of Portland cements is still not well understood. Previous studies used techniques that analyse the pastes as a whole to correlate setting times with degree of hydration. Here, in-situ synchrotron X-ray diffraction ...
Synchrotron Radiation Pair Distribution Function Analysis of Gels in Cements
(MDPI, 2017)
The analysis of atomic ordering in a nanocrystalline phase with small particle sizes, below 5 nm, is intrinsically complicated because of the lack of long-range order. Furthermore, the presence of additional crystalline ...
Mix and measure - Combining in situ X-ray powder diffraction and microtomography for accurate hydrating cement studies.
(Elsevier, 2023-11-14)
It is reported an innovative methodology based on in situ MoKα1 laboratory X-ray powder diffraction (LXRPD)
and microtomography (μCT) avoiding any sample conditioning. The pastes are injected in 2.0 mm capillaries and
the ...
Quantitative disentanglement of nanocrystalline phases in cement pastes by synchrotron ptychographic X-ray tomography
(IUCr, 2019)
Mortars and concretes are ubiquitous materials with very complex hierarchical microstructures. To fully understand their main properties and to decrease their CO2 footprint, a sound description of their spatially resolved ...
Synthesis of active Belite-Alite-Ye'elimite clinker (BAY)
(2016-06-29)
Ordinary Portland cement (OPC) is an environmentally contentious material, as for every ton of OPC produced, on average, 0.97 tons of CO2 are released. Ye'elimite-rich cements are considered as eco-cements because their ...
Local structure and Ca/Si ratio in C-S-H gels from hydration of blends of tricalcium silicate and silica fume
(Elsevier, 2021-03)
At the microscale, C-S-H gels from alite, or neat Portland cements, has a Ca/Si ratio close to 1.80. At the nanoscale, C-S-H is described by a defective tobermorite structure which allows a maximum Ca/Si ratio close to ...
Effects of sulfates on the hydration of Portland cement – A review
(2021)
Presented within is a critical overview of the effect of sulfates on cement hydration, properties, and optimum
sulfate content in Portland cement. Calcium sulfate is used in Portland cement to control the C3A
reaction ...
Activation of LC3 low-carbon cements by C-S-H seeding.
(2023)
Portland-based Limestone Calcined Clay Cements (LC3) are attracting a lot of the attention from scholars
and field applications due to the reduction in CO2 emissions. However, their low mechanical strengths at
early ages ...
Synthesis and scaled-up of non-active and active Belite-Alite-Ye'elimite clinker (BAY)
(2017-05-17)
Ordinary Portland cement (OPC) is an environmentally contentious material, as for every ton of OPC produced, ~0.97 tons of CO2 are released. This opens the need of designing new formulations of cements formed by low calcite ...
Empleo conjunto de difracción de rayos X de polvo y microtomografía de laboratorio en la hidratación del cemento Portland.
(2023)
Se trataron los aspectos más generales sobre la química del cemento, la ciencia del hormigón, el empleo de nuevos materiales más eco-eficientes en la preparación de nuevos sistemas cementantes, revalorización de residuos ...