Influence of carbon nanotubes and polycarboxylate superplasticiser on the Portland cement hydration process

2021 ◽  
Vol 304 ◽  
pp. 124648
Author(s):  
Ekaterina Karpova ◽  
Gintautas Skripkiūnas ◽  
Irmantas Barauskas ◽  
Ieva Barauskienė ◽  
Jakub Hodul
Keyword(s):  
Carbon Nanotubes ◽  
Portland Cement ◽  
Cement Hydration ◽  
Hydration Process ◽  
Portland Cement Hydration

scholarly journals Nano-level management of calcium silicate-hydrate nanoparticles structure formation during portland cement hydration process

2018 ◽  
Vol 196 ◽  
pp. 04012
Author(s):  
Alexander Guryanov ◽  
Vyacheslav Kozlov ◽  
Yulia Sidorenko
Keyword(s):  
Portland Cement ◽  
Structure Formation ◽  
Building Materials ◽  
Cement Hydration ◽  
Structural Parameters ◽  
Control Process ◽  
Hydration Process ◽  
Cement Stone ◽  
Carbonate Sludge ◽  
Portland Cement Hydration

Cement-containing building materials durability depends both on the original clinker composition and on the structure of hydrated portland cement compositions on micro and nanoscales. To calculate structural parameters of silicate-hydrate calcium nanoparticles during portland cement hydration process, the researchers applied the method of small-angle neutron scattering which included distribution of nanoparticles in size, medium nanoparticles radius, fractal dimension. Modifying nanoparticles blending with portland cement composition affects structural parameters of silicate-hydrate calcium nanoparticles. The authors used complex modifying nanoparticles in this study. Nanoparticle composition included a component that served as a filler and a chemically active component that was used as a modifier. The first component was a mixture of alpha oxide aluminum, gamma oxide aluminum and carbonate sludge. The second component presented a mixture of alumoalkaline sludge with alumocalcite sludge. These sludges were of technogenic origin. The research showed that application of complex nanoagents made it possible to control process of silicate-hydrate calcium nanoparticles structure formation, and, as the result, to influence durability of cement stone.

Effect of Waste Glass on Portland Cement Hydration Process

2021 ◽  
Vol 325 ◽  
pp. 9-20
Author(s):  
Evaldas Serelis ◽  
Vitoldas Vaitkevicius
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Glass Powder ◽  
Cement Hydration ◽  
Test Methods ◽  
Waste Glass ◽  
Test Method ◽  
Hydration Process ◽  
Hardened Cement ◽  
Portland Cement Hydration

Glass is an amorphous material, which could be a good pozzolanic material and can be beneficial in compressive strength gain. However, if waste of glass powder has undesirable contaminations (aluminium, clay impurities, sulphates, etc.) it can negatively affect hydration process. In the research were used two types of waste glass (with and without harmful impurities). Waste glass shards were obtained from a local waste recycling plant and its properties were investigated in the Portland cement hydration process. Properties of waste glass were analysed by SEM, XRD test methods, pozzolanicity of glass powder was investigated by Chappelle test method. The hydration process of Portland cement was researched by the semi-adiabatic test method and XRD analysis. Properties of hardened cement paste was analysed by: density, flexural and compressive strength test methods The main aim of this research is to analyse waste glass, which after primary cleaning is not suitable for secondary reuse and investigate its suitability in cement-based systems.

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