Results 141 to 150 of about 913 (181)

Durability of concretes containing natural pozzolan

Proceedings of the Institution of Civil Engineers - Construction Materials, 2008
In this study, the effects of tuff natural pozzolan on properties of Portland cement were investigated. The durability and mechanical properties of concrete made by these cements were studied. It was found that using the natural pozzolan does not significantly affect the mechanical properties of the Portland cement.
M. Najimi, M. Jamshidi, A. Pourkhorshidi
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Effect of Calcination on Natural Pozzolans

1950
Calcination will improve the quality of some pozzolans, reduce the quality of others, and induce pozzolanic properties in some otherwise essentially non-reactive-substances. Natural pozzolans or natural materials in which pozzolanic properties can be induced by calcination at temperatures less than 2000 F.
RC Mielenz, LP Witte, OJ Glantz
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Importance of using the natural pozzolans on concrete durability

Cement and Concrete Research, 2002
Abstract Natural pozzolans have become important because of their role in concrete durability. This situation has provoked an increase in the use of pozzolanic cement in concrete construction. This paper reports results of different portland–pozzolan cements containing different natural pozzolans, and they were compared with ASTM Types I, II and V ...
R.E Rodrı́guez-Camacho, R Uribe-Afif
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Pozzolanic soils: A natural resource for soil improvement techniques

2022
Soil improvement techniques with binders are used in several geotechnical engineering applications, as a sustainable solution for the reuse of waste soils. An experimental research started some years ago on lime-treated medium/coarse-grained pyroclastic soils from volcanic districts of Central Italy, whose geotechnical characterization was previously ...
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Production and Use of Calcined Natural Pozzolans in Concrete

Cement, Concrete, and Aggregates, 2001
Abstract The goal of producing concrete that provides longterm durability with regard to properties such as improved sulfate resistance and reduced susceptibility to alkali-silica reactions (ASR) has led to the development of several high-performance materials.
GS Barger, ER Hansen, MR Wood, T Neary, DJ Beech, D Jaquier   +5 more
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An overview on the activation of reactivity of natural pozzolans

Canadian Journal of Civil Engineering, 2001
Natural pozzolan is one of the oldest construction materials. Lime-pozzolan cements have been used for several thousands of years and have an excellent reputation for their durability. Pozzolans are being widely used as a cement replacement in Portland cement concrete.
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Natural Pozzolan-based geopolymers for sustainable construction

Environmental Earth Sciences, 2016
The study presented herein evaluates effects of alkaline activator (sodium hydroxide) concentration, solution (sodium hydroxide solution)-to-binder ratio (S/B), and curing condition on properties of alkali-activated natural Pozzolan mortars (geopolymers).
Nader Ghafoori, Meysam Najimi, Brittany Radke   +2 more
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Study on the Efficacy of Natural Pozzolans in Cement Mortar

2020
With the advent of the Industrial Revolution, science and technology grew rapidly with the producing era coming into view. The early industrial sectors engaged in small scale production of the major pollutant, smoke. Owing to the emergence of numerous factories and large scale jobs, the problems of industrial contaminating activities began to assume ...
Ashish Shukla, Nakul Gupta
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Characterization and quantification of the pozzolanic reactivity of natural and non-conventional pozzolans

Cement and Concrete Composites, 2022
Jinyoung Yoon, Khashayar Jafari, Raikhan Tokpatayeva, Sulapha Peethamparan, Jan Olek, Farshad Rajabipour   +5 more
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NATURAL POZZOLANIC MORTARS FOR CULTURAL HERITAGE

2020
Masonry buildings form large part of the world architectural heritage. They are often located in seismic areas and their vulnerability has been put in evidence after the seismic events in the course of their lives. The need of assessment of these buildings according to the performance-based demands of recent seismic codes require a deep knowledge of ...
G. Faella, M. Aurilio, A. Tufaro, G. Frunzio   +3 more
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