Pozzolanic activity of volcanic rocks from Southern Jiangxi Province, China

Yu, Lehua; Zhou, Shan; Deng, Wen-Wu

doi:10.1080/21650373.2015.1010660

Cited by 10 publications

(3 citation statements)

References 30 publications

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“…Therefore, a great deal of efforts has been made in previous studies to identify alternative or supplementary cementitious materials (SCMs) to fully or partially replace Portland cement (PC) in concrete. Within the feasible alternative materials for PC replacement, natural materials, less embodied-energy materials, industrial wastes, or by-products from different manufacturing processes having pozzolanic properties, such as volcanic rocks [6], coal fly ash and bottom ash [7,8,9,10], zeolite [11,12], biomass-based ashes [13,14,15,16], ground granulated blast-furnace slag [17], waste glass powders [18], and many others [19,20], exist.…”

Section: Introductionmentioning

confidence: 99%

Complex Characterization and Behavior of Waste Fired Brick Powder-Portland Cement System

et al. 2019

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Two waste fired brick powders coming from brick factories located in Argentine and Czech Republic were examined as alternative mineral admixtures for the production of blended cements. In pastes composition, local Portland cements (Argentine and Czech) were substituted with 8–40%, by mass, with powdered ceramic waste. For the ceramic waste-Portland cement system, workability, the heat released, pozzolanity, specific density, compressive strength, hydrated phases, porosity, and pore size distribution were tested. The relevance of the dilution effect, filler effect, and pozzolanic activity was analyzed to describe the general behavior of the pozzolan/cement system. The properties and performance of cement blends made with finely ground brick powder depended on the composition of ceramic waste and its reactivity, the plain cement used, and the replacement level. Results showed that the initial mini-slump was not affected by a low ceramic waste replacement (8% and 16%), and then it was decreased with an increase in the ceramic waste content. Brick powder behaved as a filler at early ages, but when the hydration proceeded, its pozzolanic activity consumed partially the calcium hydroxide and promoted the formation of hydrated calcium aluminates depending on the age and present carbonates. Finally, blended cements with fired brick powder had low compressive strength at early ages but comparable strength-class at later age.

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Section: Introductionmentioning

confidence: 99%

Complex Characterization and Behavior of Waste Fired Brick Powder-Portland Cement System

et al. 2019

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“…Due to the overlapping nature of crystalline phases, the XRD pattern lacks the humps of amorphous phases [26,28]. Table 4 summarizes the petrographic examination of the studied volcanic tuffs.…”

Section: Microscopic Examinationmentioning

confidence: 99%

Geochemical and Experimental Investigations of some Egyptian Volcanic Tuffaceous Rocks as Natural Supplementary Cementitious Materials

El-Shafey,

Heikal,

El-Dsoky

et al. 2024

Advances in Science and Technology

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Supplementary cementitious materials are additives that are used to improve the qualities of Portland cement while also reducing its environmental impact. The production of such blended cements relies on the regional availability of additional components. Despite the prevalence of volcanic tuffs in the Eastern Desert and South Sinai encountered in Egypt, there is a scarcity of knowledge regarding experimental research on cement manufacture. The main objective of this study is to analyze the geochemical and experimental characteristics of several volcanic tuffaceous rocks exploited as natural additional cementitious materials and their impact on the characteristics of the resulting blended cement. The partially replacement can play an important role in reducing the local environmental impacts (CO2 emissions). Various volcanic rock specimens have been collected from the Sinai (Wadi Kid) and the Eastern Desert (Gabal Umm Zarabit, Wadi Umm Khariga, Gabal Igla El-Iswid, and Abu Wassat), Egypt. The samples under study were examined for their mineralogy, petrography, and chemical composition in order to identify their specifications. In addition, a total of fifteen blended cement samples were produced by partially replacing clinker with the investigated samples. The substitution ratios used were 10%, 20%, and 25% by mass. A control mix was also designed, consisting of ordinary Portland cement without any other substances. An assessment has been conducted on the effects of partially replacing clinker with volcanic rocks on the characteristics of the resulting blended cement. The physico-mechanical parameters, including Blaine, setting time, flexural strength, and compressive strength, of the hardened blended mortars were measured at specific times (7 and 28 days). The study demonstrated that the strength of the studied blended cement mixes decreased as the fraction of the examined volcanic rocks to clinker ratio increased throughout the early stages. The highest compressive strength among the mixtures evaluated was achieved when using a 10% ratio of volcanic rocks as clinker replacement.

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“…Approximately 35 mg of the hydrated samples was used in a Mettler Toledo TGA/SDTA 851e analyzer heated to 750 ∘ C, ramping at 10 ∘ C per minute in N 2 gas. The Ca(OH) 2 content was deduced from the equation provided by Yu et al[10] and given as…”

mentioning

confidence: 99%

Maximizing Sustainability of Concrete through the Control of Moisture Rise and Drying Shrinkage Using Calcined Clay Pozzolan

Ankrah

Bediako

Twumasi-Ampofo

et al. 2016

Journal of Construction Engineering

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The Ghanaian concrete industry is really a booming industry due to many infrastructural developments and the surge in residential development. However, many developmental projects that utilize concrete do suffer from the negative impact of moisture rise including paint peeling-off, bacterial and fungi growth, and microcracks as well as unpleasant looks on buildings. Such negative outlook resulting from the effects of moisture rise affects the longevity of concrete and hence makes concrete less sustainable. This study seeks to develop materials that could minimize the rise of moisture or ions through concrete medium. The experimental works performed in this study included pozzolanic strength activity index, water sorptivity, and shrinkage test. Calcined clay produced from clay was used as pozzolan to replace Portland cement at 20%. The strength activity test showed that the cement containing the calcined material attained higher strength activity indices than the control. The thermal gravimetric analysis showed that the pozzolan behaved partly as a filler material and partly as a pozzolanic material. The sorptivity results also showed that the blended mix resulted in lower sorptivity values than the control mortar. The study recommends that calcined clay and Portland cement mixtures could be used to produce durable concrete to maximize sustainability.

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Pozzolanic activity of volcanic rocks from Southern Jiangxi Province, China

Cited by 10 publications

References 30 publications

Complex Characterization and Behavior of Waste Fired Brick Powder-Portland Cement System

Complex Characterization and Behavior of Waste Fired Brick Powder-Portland Cement System

Geochemical and Experimental Investigations of some Egyptian Volcanic Tuffaceous Rocks as Natural Supplementary Cementitious Materials

Maximizing Sustainability of Concrete through the Control of Moisture Rise and Drying Shrinkage Using Calcined Clay Pozzolan

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