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, 2016 La voce riferisce la descrizione sintetica della pozzolana, materiale proveniente da rocce di origine vulcanica costituite prevalentemente da silice ed allumina, presente in Italia allo stato incoerente o compatto. Si può avere anche pozzolana artificiale o prodotti a comportamento pozzolanico a partire da materiali naturali (argille, scisti) trattati
VILLANI, TERESA
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Influence and effectiveness of water-repellent admixtures on pozzolana–lime mortars for restoration application [PDF]
Construction and Building Materials, 2013 Pozzolana–lime mortars modified with water-repellent admixtures were designed and studied to obtain mortars for restoration application. Powdered silane and calcium stearates were mixed with pozzolana, lime and sand and the chemical–physical properties ...
Laura Falchi +2 more
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Estimation of pozzolana content in Portland pozzolana cement
Cement and Concrete Research, 1983Abstract A simple and rapid method based on cold and dilute hydrochloric acid has been developed to determine pozzolana content in Portland pozzolana cements (PPC). The method is applicable to different types of pozzolana even in the absence of original samples of ingredients used in the production of PPC. A 5% (v/v) solution of HCl (sp. gr.
R.K. Datta, Tilak Raj
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Pozzolana and Pozzolanic Cements—A Review Part I: Pozzolana
Transactions of the Indian Ceramic Society, 1981In this review, different types of pozzolanas, their activity in relation to different factors, various methods for evaluation of their reactivity and their hydration etc have been discussed. Some of the important parameters by which the reactivity of a pozzolana is influenced have been stated to be microstructure, temperature of calcination and ...
C. Samanta, M. K. Chatterjee
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Transactions of the Indian Ceramic Society, 1989
Determination of pozzolana content in portland pozzolana cement (PPC) by the hydrochloric acid extraction technique has been already investigated. In the existing methods the varying degree of dissolution of pozzolana contents causes its over- or underestimation. This could be eliminated by using dilute hydrochloric acid (0.4 M) of known volume. In the
M. S. Surana, S. N. Joshi
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Determination of pozzolana content in portland pozzolana cement (PPC) by the hydrochloric acid extraction technique has been already investigated. In the existing methods the varying degree of dissolution of pozzolana contents causes its over- or underestimation. This could be eliminated by using dilute hydrochloric acid (0.4 M) of known volume. In the
M. S. Surana, S. N. Joshi
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Conservation & Recycling, 1978
Abstract Preliminary investigations into the utilization of bauxite waste has shown that with a suitable heat-treatment followed by ball-milling to cement fineness, a material with pozzolanic activity, referred to as bauxite pozzolana, can be produced.
V.O. Nwoko, A.A. Hammond
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Abstract Preliminary investigations into the utilization of bauxite waste has shown that with a suitable heat-treatment followed by ball-milling to cement fineness, a material with pozzolanic activity, referred to as bauxite pozzolana, can be produced.
V.O. Nwoko, A.A. Hammond
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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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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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