Results 41 to 50 of about 15,071 (234)
DEF: As a form of sulfate attack
Materiales de Construccion, 1996 Delayed ettringite formation (DEF) is the term used to describe expansion of some heat cured portland cement concretes. Although meaningful progress has been made, the exact mechanism of the expansion itself is not entirely understood.
J. Skalny +3 more
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Chemo-Mechanical Interactions in the Ettringite Induced Expansion of Sulfate-Bearing Soils
Geosciences, 2019 Expansive sulfate-bearing soils are frequently encountered in transportation and construction practices. These soils are often treated with a lime or cement stabilizer to improve the relevant qualities.
Zhongmei Wang, Pawan Sigdel, Liangbo Hu
doaj +1 more source
Damage assessment of concrete structures exposed to fire [PDF]
, 2013 During a fire, concrete structures behave in most cases very well. It could therefore be of economic interest to repair the damaged structures, as costs for demolition and rebuilding can be avoided and the building can be reused faster.
Annerel, Emmanuel, Taerwe, Luc
core +1 more source
Anisotropic compressional behavior of ettringite [PDF]
Cement and Concrete Research, 2019 Abstract The high-pressure behavior of a natural ettringite [Ca6Al2(SO4)3(OH)12·27H2O, a = 11.2104(2) A, c = 21.4350(3) A, sp. gr. P31c] has been studied by single-crystal X-ray diffraction with a diamond-anvil cell up to 4.22 GPa, using the methanol:ethanol = 4:1 mixture as a hydrostatic pressure-transmitting fluid. The isothermal bulk modulus (K0 =
D. Comboni +4 more
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Physical Origin of Temperature Induced Activation Energy Switching in Electrically Conductive Cement
Advanced Science, EarlyView.The temperature‐induced Arrhenius activation energy switching phenomenon of electrical conduction in electrically conductive cement originates from structural degradation within the biphasic ionic‐electronic conduction architecture and shows percolation‐governed characteristics: pore network opening dominates the low‐percolation regime with downward ...
Jiacheng Zhang +7 more
wiley +1 more source
The Influence of the Different Cementitious Material on Self-Healing of Microcracks in Shotcrete
Advances in Materials Science and Engineering, 2022 Due to a particular construction process, the shotcrete structure is affected by external load, material aging, and external temperature during use, with cracks inevitably appearing.
Junru Zhang +4 more
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Journal of Materials Research and Technology, 2023 Lithium carbonate (Li2CO3) is a commonly used early strength agent for sulfoaluminate cement based grouting materials. Low concentrations of Li2CO3 (≤30 μmol Li/g in sulfoaluminate cement) can significantly accelerate the early hydration of ...
Haiyan Li +4 more
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Metasurface Enhanced Photothermal Cement Foam for Robust and High‐Throughput Seawater Desalination
Carbon Energy, EarlyView.Schematic of 3D metasurface‐enhanced cement foam for robust and high‐throughput seawater desalination. This study presents a cement‐based solar evaporator (CSE) fabricated in one step via viscoelastic lithography with simple negative pressure. In addition to boosting solar‐to‐vapor conversion efficiency via excellent light‐harvesting capacity, the ...
Jianjun Guo +4 more
wiley +1 more source
Optimisation of Magnesium Oxide and Silica Fume Blend for Sulphate Soil Stabilisation
CeramicsThe utilisation of magnesium oxide-based binders (M) as an alternative to hydrated calcium silicate materials is a promising avenue for binding methodologies.
Jonathan Oti +3 more
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Synthesis and thermodynamic properties of arsenate and sulfate-arsenate ettringite structure phases. [PDF]
PLoS ONE, 2017 Arsenic is a toxic and carcinogenic contaminant of potential concern. Ettringite [Ca6Al2(SO4)3(OH)12·26H2O] has the ability to incorporate oxyanions as a solid solution with SO42-, which could lower the soluble oxyanion concentrations.
Weixing Wang +3 more
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