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Characteristics of Pastes From a Portland Cement Containing Different Amounts of Natural Pozzolan

Cement and Concrete Research, 2003
This work is concerned with assessing the influence of natural pozzolan on the physical, mechanical and durability properties of blended Portland cement pastes.
Colak, Adnan
exaly   +2 more sources

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Natural pozzolans for concrete

Economic Geology, 1951
Many geologic formations in the United States yield pozzolans or materials which can be converted into pozzolans by grinding and calcination. When properly selected, processed, and used, pozzolans will reduce costs, improve quality of concrete, protect concrete against effects of reaction between aggregate and cement alkalies, and inhibit attack by ...
Richard Childs Mielenz, Kenneth Titsworth Greene, Nicholas Cyril Schieltz   +2 more
openaire   +1 more source

Natural Pozzolans

2017
This chapter is dedicated to several kinds of natural pozzolans that occur around the globe and describes their specific characteristics, origin and use in concrete. Moreover, the advantages and disadvantages of their use in concrete mixes are highlighted in terms of concrete properties. In particular, the referenced properties in this chapter are that
Dedeloudis, C., Zervaki, M., Sideris, K., Juenger, M., Alderete, N., Kamali-Bernard, Siham, Villagrán, Y., Snellings, R.   +7 more
openaire   +1 more source

The Long-Term Durability Performance of Gypsum–Portland Cement–Natural Pozzolan Blends

Cement and Concrete Research, 2002
The density, workability, porosity, strength development, and durability of gypsum-Portland cement-natural pozzolan blends are discussed in this paper. The results indicate that the variation in proportions of the mix constituents causes changes in the ...
Colak, Adnan
exaly   +2 more sources

Evaluation of pozzolanic activity of natural and artificial pozzolans by thermal analysis

Thermochimica Acta, 2004
Abstract In this research, the pozzolanic activity of natural and artificial pozzolan used for preparation of restoration mortars was evaluated. For this purpose, several pastes were prepared, by mixing two artificial pozzolans and a natural one with commercial hydrated lime, in different ratios. The pastes were cured in standard conditions (RH = 98%,
Antonia Moropoulou, Asterios Bakolas, Eleni Aggelakopoulou   +2 more
openaire   +1 more source

Pozzolanic activity of natural pozzolan–lime pastes and physicomechanical characteristics

Journal of Thermal Analysis and Calorimetry, 2018
In order to evaluate the pozzolanic activity of a natural pozzolan (NP) of rhyolitic composition, several pastes were prepared by mixing the pozzolan with hydrated lime, in different ratios. The pastes were stored in standard conditions (RH = 99 ± 1%, T = 25 ± 1 °C) and evaluated using thermal analysis (TG-DTA), X-ray diffraction, compressive strength ...
Asterios Bakolas, Eleni Aggelakopoulou
openaire   +1 more source

Influence of the fineness of pozzolan on the strength of lime natural-pozzolan cement pastes

Cement and Concrete Research, 1994
Abstract The fineness of a cement is an important factor affecting the rate of strength development. This paper examines the importance of the fineness of natural pozzolans to the strength development of lime-pozzolan cements (LPCs). A natural pozzolan from Bolivia, which is typical of natural pozzolans found in South and Central America, was ground ...
Robert L. Day, Caijun Shi
openaire   +1 more source

Experimental Research on Natural Pozzolan as Cement Replacement

ABUAD International Journal of Natural and Applied Sciences, 2023
This paper presents the properties of mortar and concrete with NBRRI pozzolan as partial replacement of cement. In this research, NBRRI pozzolan from NBRRI and local cement (Dangote) are used. Firstly, chemical composition of NBRRI pozzolan and Dangote cement are analyzed.
Jighjigh Eric Annune, Abimiku Yohanna, Charles Arome Oguche, C. B. Wali   +3 more
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +1 more source