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Pozzolanas and Pozzolanic Materials
2019Developments in concrete construction mean that there are now a broader range of cementitious materials, than have traditionally been available, providing options for engineers to meet specific technical requirements. Pozzolanas and pozzolanic materials from natural deposits or industrial processes represent a group within this category.
McCarthy, Michael John +1 more
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Using local sandstone as a pozzolana
Batiment International, Building Research and Practice, 1981Could sandstone waste from phosphate ore mining in Egypt's Western Desert be an effective and economic additive to ordinary Portland cement? The question led to experiments from which it appears that a 15 per cent addition of the gluconitic sandstone involved has little effect on compressive strength.
M.A. Shater +3 more
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Simpler tests for lime-pozzolanas
Batiment International, Building Research and Practice, 1981Lime-pozzolana mixtures could be a useful alternative to costly cements for many developing countries, but evaluating local samples can be a problem. This article describes simple tests with 25 mm cubes cast in gang moulds which can easily be carried out in the field and which give a good correlation with the results of medium-term strength tests.
R.J.S. Spence, W.J. Allen
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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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The mechanism of the hydration in the system C3S-pozzolana
Cement and Concrete Research, 1980Abstract A mixture of five kinds of Japanese pozzolanas and synthesized pure C 3 S were hydrated. The hydration mechanism in the system C 3 S-pozzolana was investigated. The hydration of C 3 S was accelerated by the addition of pozzolanas. The reasons for the acceleration increase of the precipitation sites of hydrates and the increase of the ...
K. Ogawa +3 more
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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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Potential of compost mixed with tuff and pozzolana in site restoration
Waste Management, 2015The present research is aimed at evaluating the potential of mixtures made of different percentages of compost (10%, 20% and 30% by volume) and inorganic waste from extraction activities (tuff and pozzolana) for site restorations. The materials alone and the mixtures were characterised from a geotechnical point of view, in order to determine the ...
SBAFFONI, Silvia +2 more
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