Results 31 to 40 of about 45,573,897 (286)
Applied Sciences, 2023 The current study aims to investigate the effect of calcium hydroxide on the geopolymer derived from an admixture of the natural mineral (kaolin) and industrial by-products (fly ash, red mud).
Tien Dung Cong +3 more
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C–S–H gel densification: The impact of the nanoscale on self-desiccation and sorption isotherms [PDF]
Cement and Concrete Research, 2018 The relationship between humidity and water content in a hydrating cement paste is largely controlled by the nanostructure of the C-S-H gel. Current hydration models do not describe this nanostructure, thus sorption isotherms and self-desiccation are given as constitutive inputs instead of being predicted from microstructural evolution. To address this
Enrico Masoero +2 more
openaire +3 more sources
A review on alkaline activation: new analytical perspectives
Materiales de Construccion, 2014 For many years now the idea of including alkalis in a Portland cement matrix has been regarded as a daft or inexcusably erroneous proposition: despite its absurdity, that opinion has been widely accepted as a basic premise by the scientific and technical
A. Palomo +5 more
doaj +1 more source
Effect of temperature on C–S–H gel nanostructure in white cement [PDF]
Materials and Structures, 2013 © 2013, RILEM. Different ages of white cement pastes hydrated at 100 % RH and 25 or 65 °C were characterised with 29Si MAS NMR spectroscopy. The findings showed that raising the curing temperature from 25 to 65 °C accelerated hydration of the belite phase considerably, inducing a sixfold rise in its one day degree of hydration, while alite phase ...
Sáez del Bosque, Isabel F. +3 more
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Properties of fly ash geopolymer with calcium aluminate cement as an additive
Shuili Shuiyun Gongcheng Xuebao, 2022 In this study, the influence of calcium aluminate cement on the properties of fly ash based geopolymer was analysed. Calcium aluminate cement was used to replace fly ash, and the content was 0%, 2%, 4%, 8% and 12%, respectively.
WANG Yamin +5 more
doaj +1 more source
Microstructural aspects in steel fiber reinforced acrylic emulsion polymer modified concrete
E3S Web of Conferences, 2018 Scanning electron microscope observations of polymer-free and polymer-modified cements have shown that the polymer particles are partitioned between the inside of hydrates and the surface of anhydrous cement grains. For optimum dosage of acrylic emulsion
Hazimmah Dayang +3 more
doaj +1 more source
Case Studies in Construction Materials, 2023 Calcium silicate hydrate (C-S-H) governs the binding of cement-based materials, influencing various properties through its microstructure. However, understanding C-S-H's microstructure development and morphological evolution mechanisms remains incomplete.
Yu Yan, Jinhui Tang, Guoqing Geng
doaj +1 more source
Materiales de Construccion, 2009 One of the chief causes of cement and concrete deterioration is the loss of durability prompted by sulphate attack. The existing standards call for long test periods (2- 12 months).
S. Martínez-Ramírez +1 more
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MATEC Web of Conferences, 2014 The development of alternatives to traditional Portland cement produced with more eco-efficient processes (lower energy consumption and CO2 gas emissions) is an item on climate change and innovation agendas.
Puertas F. +5 more
doaj +1 more source
Densification of C-S-H measured by H NMR relaxometry [PDF]
, 2012 The nanoscale morphology of, and pore water interactions in, calcium silicate hydrate (C-S-H), the active component of cement, remain uncertain. H-1 nuclear magnetic resonance (NMR) can fully characterize the nanoporosity of C-S-H in as-prepared material
Muller, Arnaud C. A. +7 more
core +2 more sources