Results 171 to 180 of about 1,460 (211)
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Osservazioni petrografiche su di una pozzolana del Vesuvio (“pozzolana di fuoco„)
Bulletin Volcanologique, 1930L’auteur decrit la composition mineralogique et petrographique d’une pouzzolane du Vesuve, laquelle est formee de debris de roches du Somma-Vesuve et de scories de laves legerement cimentees par de la cendre extremement fine.
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Hygric Properties of HPC with Natural Pozzolana
Key Engineering Materials, 2016The water vapour transport and the liquid water transport of high performance concrete (HPC) with the content of natural pozzolana are the described in this paper. Studied properties are presented by means of water vapour diffusion coefficient, water vapour diffusion resistance factor and absorption coefficient respectively. The natural pozzolana (NP),
Jaroslava Koťátková +3 more
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Lime mortar with natural pozzolana
2008The paper deals with the investigation of the mechanical behavior of lime mortar enriched with natural pozzolana, widely used in historical masonry. The study aims to investigate the mechanical behavior of natural pozzolana lime mortars, reproduced in laboratory by using different mix designs, as reported in historical Italian architectural treatises ...
SALA, Elisa +2 more
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Strength Characteristics of Bauxite Pozzolana Concrete
Journal of the Construction Division, 1978Bauxite is currently mined in Ghana on a commercial basis. Beneficiation of the ore is undertaken before it is exported and during the beneficiation process significant amount of the ore estimated at between 20% and 25% are washed away as red mud. The red mud is dumped into large ponds where it is left to dry.
Vincent O. Nwoko, Alex A. Hammond
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The effect of pozzolanas on the tricalcium aluminate hydration
Cement and Concrete Research, 1978Abstract The effect of pozzolanas on the C 3 A hydration with and without lime and gypsum was examined. The addition of pozzolana lowers the heat evolution caused by C 3 A hydration. Lime combination with C 3 A and its hydration product is favoured by the addition of pozzolana, with a different mechanism of reaction depending on the presence of ...
Mario Collepardi +3 more
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Hydration of C3S-pozzolana paste estimated by trimethylsilylation
Cement and Concrete Research, 1981Abstract The structure, quantity and the degree of polycondensation of silicate ion in C 3 S-pozzolana pastes were examined and discussed in relation to the strenght and the rate of hydration of C 3 S and pozzolana. Gel permeation chromatography was adopted to prepare the standard pure sample for the calibration curves and to determine the ...
H. Uchikawa, R. Furuta
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Characterization of moist pozzolana: stability and flow parameters
Materials and Structures, 2011We present here experimental results on the flow and stability conditions for a granular system as a function of the moisture percentage present inside the sample. The granular material used in all the experiments was a pozzolanic ash frequently used in cement production.
M. E. Médici +7 more
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Caratterizzazione geotecnica della pozzolana di Orvieto
2006La città di Orvieto sorge su una piastra rocciosa costituita da tufi litoidi e pozzolane, poggiante su una formazione argillosa. I fenomeni di dissesto che fin da tempi storici coinvolgono il margine della Rupe e le cavità sotterranee in essa scavate rendono necessaria un'approfondita caratterizzazione geotecnica dei materiali piroclastici.
TOMMASI P. +2 more
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Effect of wastewater on properties of Portland pozzolana cement
AIP Conference Proceedings, 2017This paper presents the effect of wastewaters on properties of Portland pozzolana cement (PPC). Fourteen water treatment plants were found out in the Narasaraopet municipality region in Guntur district, Andhra Pradesh, India. Approximately, from each plant, between 3500 and 4000 L/day of potable water is selling to consumers.
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