Results 171 to 180 of about 375,303 (201)
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An overview on the activation of reactivity of natural pozzolans
Canadian Journal of Civil Engineering, 2001Natural 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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Comparison of different methods for enhancing reactivity of pozzolans
Cement and Concrete Research, 2001Abstract This paper compares three methods for the activation of pozzolanic reactivity of a natural pozzolan: (1) prolonged grinding of natural pozzolans (mechanical method), (2) elevated temperature curing of cement pastes containing a pozzolan (thermal method), and (3) use of chemical activators such as Na2SO4 and CaCl2 (chemical method).
Caijun Shi, Robert L Day
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Reactivity of lime Activated Pozzolans
SP-202: Third Canmet/ACI International Symposium: Sustainable Development of Cement and Concrete, 2001This paper utilizes electrical methods to follow the early hydration characteristics of a range of materials activated with calcium hydroxide at room temperature (20 degrees C). The electrical response is measured in terms of the in-phase (i.e. resistance) and quadrature (i.e. capacitance) components of the sample admittance.
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Spectrophotometric method for estimating the reactivity of pozzolanic materials
Advances in Cement Research, 1988Synopsis A spectrophotometric method is described for estimating the reactivity of pozzolanic materials. The method consists of boiling the pozzolana in 0·5 N NaOH solution for 3 min and estimating the alkali-soluble silica by spectrophotometry.
M. S. Surana, S. N. Josh
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Pozzolanic reactivity of silico-aluminous fly ash
Particuology, 2008Abstract For some years it has been possible to control the particle size of fly ashes, by-products of thermal power stations. Incorporating these very fine particles (obtained by grinding and/or pneumatic selection) improves the physical–mechanical characteristics of mortars and concretes.
Adamiec, Pierre +2 more
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Estimating reactivity of pozzolanic materials by a spectrophotometric method
Advances in Cement Research, 1990Following earlier work on estimating the reactivity of pozzolanic materials, three classes of pozzolanas have been further investigated, to ascertain whether or not a more linear calibration curve is possible. A better linear correlation exists when separate calibration curves between absorbance and lime-pozzolana mortar strength values for different ...
M. S. Surana, S. N. Joshi
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Properties and pozzolanic reactivity of flash calcined dredging sediments
Applied Clay Science, 2016Abstract Dredging of ports, harbours and waterways generates vast amounts of sediments that find few applications and need to be disposed of. In the port of Antwerp, Belgium, each year 450,000 t (dry matter) of dredging sediments are mechanically dewatered and stockpiled. This paper investigates flash calcination of the clay-rich dredged sediments as
Snellings, Ruben +7 more
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Pozzolanic activity and alkaline reactivity of a mordenite-rich tuff
Microporous and Mesoporous Materials, 2009Peer ...
Vigil de la Villa, R. +4 more
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Mineralogical effect on the pozzolanic reactivity of a Mexican lacustrine soil
Construction and Building Materials, 2010Abstract Clay minerals have been used as natural pozzolans with the aim of reducing CO 2 emissions, and densifying the matrix with hydration products in pastes and mortars. This study assesses the pozzolanic reactivity of a natural lacustrine material in its natural and thermally-treated states.
Jacobo Martinez-Reyes +3 more
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Pozzolanic Reactivity of Calcareous Low-Grade Calcined Clays
Turkish Journal of Civil EngineeringClays have played a fundamental role in human development, from early use in pottery and construction to modern applications in advanced ceramics, pharmaceuticals and environmental remediation. Their properties, combined with their abundance, make them an indispensable material for meeting today's engineering challenges, reinforcing their importance ...
Oğul Can Yeşilyurt +3 more
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