Portland-zeolite-cement for minimizing alkali-aggregate expansion

Sersale, R.; Prigione, G.

doi:10.1016/0008-8846(87)90004-4

Cited by 28 publications

(5 citation statements)

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“…Authigenic components of volcanic rock aggregates, mainly clay minerals and zeolites, improve the durability and chemical resistance of modern, experimental, pozzolanic concretes (e.g., Sersale & Frigione, 1987;Massazza, 1988;Habert et al, 2008;Caputo, Liguori, & Colella, 2008). In this regard, the ternary diagram of Figure 8 provides a preliminary framework for evaluating variations in the relative abundances of the argillic and zeolitic components of Pozzolane Rosse and their contribution to the pozzolanic activity of the ash in the ancient mortars.…”

Section: Alteration Facies Of the Pozzolane Rosse Ignimbritementioning

confidence: 99%

Mid‐Pleistocene pozzolanic volcanic ash in ancient Roman concretes

et al. 2009

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The extraordinarily durable concretes of Imperial Age (27 B.C. through 3rd century A.D.) monument construction in Rome contain scoriaceous, highly potassic, altered volcanic ash from the Pozzolane Rosse ignimbrite, erupted at 456±3ka from the Alban Hills volcano as pozzolanic mortar aggregate. Stratigraphic, micromorphological, and chemical investigations demonstrate that during the relatively warm, humid period preceding marine isotope stage 11, intensive hydrolytic pedogenesis produced dense illuvial clay coatings in the upper horizon of the ignimbrite. Moderately altered ash of the Pozzolane Rosse transitional Bt to Bw soil horizon has opal coatings overlain by limpid, illuvial halloysite coatings. Less weathered ash from a lower C horizon apparently was altered in ground water. Where the ignimbrite filled certain paleovalleys, zeolitic alteration produced phillipsite and chabazite textures. Builders selected ash from these intermediate and least altered horizons for the highest‐quality mortars of the Imperial Age, as for the Forum and Markets of Trajan (A.D. 107 to 113). The alumina‐ and alkali‐rich compositions of cementitious complexes give some preliminary insights as to why the reaction of hydrated lime with the altered, alkali‐rich Pozzolane Rosse ash produced pozzolanic cements that have remained resistant to decay for nearly 2000 years. The results of the geological analyses fully confirm empirical observations made by Esther B. Van Deman in 1912 regarding the durability of the ancient mortars and the technical choices of Roman builders. © 2009 Wiley Periodicals, Inc.

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Section: Alteration Facies Of the Pozzolane Rosse Ignimbritementioning

confidence: 99%

Mid‐Pleistocene pozzolanic volcanic ash in ancient Roman concretes

et al. 2009

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“…Partial replacement of the Portland clinker in so-called blended Portland cements by pozzolans such as natural zeolites allows for a reduction in the economic and environmental costs of energy-intensive cement production . Moreover, zeolitic additions were shown to impart technical improvements in concrete durability such as increased resistance to corrosive salt solutions and lower susceptibility to expansion due to alkali–silica reactions. , Recent investigations into the fate of zeolites incorporated as finely ground supplementary cementitious material in Portland cement based concrete blends have demonstrated the consumption of zeolites by the pozzolanic reaction with the portlandite formed in the hydrating cement, producing sparsely soluble calcium silicate hydrates and calcium aluminate hydrates . (Justification SI 1).…”

Section: Introductionmentioning

confidence: 99%

Cation Exchange Properties of Zeolites in Hyper Alkaline Aqueous Media

Tendeloo

Blochouse

Dom

et al. 2015

Environ. Sci. Technol.

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Construction of multibarrier concrete based waste disposal sites and management of alkaline mine drainage water requires cation exchangers combining excellent sorption properties with a high stability and predictable performance in hyper alkaline media. Though highly selective organic cation exchange resins have been developed for most pollutants, they can serve as a growth medium for bacterial proliferation, impairing their long-term stability and introducing unpredictable parameters into the evolution of the system. Zeolites represent a family of inorganic cation exchangers, which naturally occur in hyper alkaline conditions and cannot serve as an electron donor or carbon source for microbial proliferation. Despite their successful application as industrial cation exchangers under near neutral conditions, their performance in hyper alkaline, saline water remains highly undocumented. Using Cs(+) as a benchmark element, this study aims to assess the long-term cation exchange performance of zeolites in concrete derived aqueous solutions. Comparison of their exchange properties in alkaline media with data obtained in near neutral solutions demonstrated that the cation exchange selectivity remains unaffected by the increased hydroxyl concentration; the cation exchange capacity did however show an unexpected increase in hyper alkaline media.

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“…The pozzolanic properties of zeolites also help mitigate alkali–silica reactions (ASRs) in concrete [ 4 , 5 , 12 , 13 , 14 ]. In this context, however, zeolites can have a variety of effects.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Ions Contained in Concrete Pore Solutions on Natural Zeolites

Czapik

2023

Materials

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This article investigates the relationships between different chemical compositions of simulated cement concrete pore solutions and changes on the surface of zeolite rock with potassium clinoptilolite as its main component. The changes were studied using X-ray diffraction (XRD), thermal analysis (DTA-TG) and scanning electron microscopy (SEM). Zeolite powder samples and a ground section of 16–64 mm grain were tested. The simulated pore solutions were based on Ca, Na, K hydroxides and K2SO4. It was found that 100% of Ca(OH)2 in the systems could react between 7 and 180 days of hydration due to pozzolanic and side reactions. As the degree of clinoptilolite conversion increased, it became more difficult to detect it in X-ray patterns. At the same time, various microstructural changes could be observed. As a result of the reactions that occurred, hydrated calcium silicates, sulfate and carbonate compounds were formed. Potassium hydroxide had a more substantial effect on clinoptilolite reactivity than sodium hydroxide. This effect can be enhanced by the presence of SO23− ions in the solution.

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Portland-zeolite-cement for minimizing alkali-aggregate expansion

Cited by 28 publications

References 1 publication

Mid‐Pleistocene pozzolanic volcanic ash in ancient Roman concretes

Mid‐Pleistocene pozzolanic volcanic ash in ancient Roman concretes

Cation Exchange Properties of Zeolites in Hyper Alkaline Aqueous Media

The Impact of Ions Contained in Concrete Pore Solutions on Natural Zeolites

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