نتایج جستجو برای: evaporable water
تعداد نتایج: 550794 فیلتر نتایج به سال:
this study assesses the kinetics of hydration of pulverised fuel ash and metakaolin cement pastes and compares how the rate of reaction affects the pore-characteristics and resistance to ionic ingress. the degrees of hydration for the different mixtures were evaluated, both as a function of the calcium hydroxide content and with respect to the chemically combined water contents. the reaction ra...
A model that describes hydration and heat-mass transport in Portland cement mortar during steam curing was developed. The hydration reactions are described by a maturity function that uses the equivalent age concept, coupled to a heat and mass balance. The thermal conductivity and specific heat of mortar with water-to-cement mass ratio of 0.30 was measured during hydration, using the Transient ...
The large scale application of non-evaporable getter coating in RHIC has been effective in reducing the electron cloud. Since beams with higher intensity and smaller bunch spacing became possible in operation, the emittance growth is of concern. Study results are reported together with experiences of machine improvements: saturated NEG coatings, anti-grazing ridges in warm sections, and the pre...
A new evaporable electron acceptor material for organic photovoltaics based on N-ethyl barbituric acid bithiophene (EBB) has been demonstrated. Bilayer devices fabricated with this non-fullerene acceptor and boron subphthalocyanine chloride (SubPc) donor produce power conversion efficiencies as high as 2.6% with an extremely large open-circuit voltage approaching 1.4 V.
A. Rossi, CERN, Geneva, Switzerland Abstract The LHC room temperature sections will be coated with non-evaporable getter (NEG) materials for, among other reasons, their properties of antimultipactor. Laboratory measurements of secondary electron yields (SEY) of TiZrV NEG coatings have shown that after 2 h heat treatment at 160 and 200 C, the maximum SEY decreases from 2 to below 1.4 and 1.1 res...
The effect of the supplementary materials (SCMs) on moisture content and ion diffusivity at different hydration time is important for service life modelling modern concrete. This study designed a simple but valid method to monitor microstructure change in pastes during hydration. A procedure easy implement was proposed detect water pastes. electrical conductivity pore solution evaluated by evap...
In cement-based materials porosity plays an important role in determining their mechanical and transport properties. This paper describes an improved low–cost embeddable miniature NMR sensor capable of non-destructively measuring evaporable water loss and porosity refinement in low and high water-to-cement ratio cement-based materials. The sensor consists of two NdFeB magnets having their North...
The phosphogypsum is a by-product of the phosphate fertilizer industry. It has accumulated over several decades, and not only takes up large amount land, but also poses significant risk to environment resource waste. In order promote use phosphogypsum, its hydration hardening characteristics are studied using scanning electron microscope, X-ray diffractometer mercury intrusion porosimeter. When...
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