The development of alkaliactivated mixtures for soil stabilisation. The utilization of pozzolanic materials in concrete as partial replacement of cement is gaining immense importance today, mainly on account of the improvements in the longterm durability of concrete combined with ecological benefits. Waswa3 1 phd candidate, department of disaster preparedness and engineering management, mmust 2department of civil and structural engineering, mmust, 3department of disaster preparedness and engineering management, mmust. If you do not see its contents the file may be temporarily unavailable at the journal website or you do not have a pdf plugin installed and enabled in your browser. Effect of curing temperature on pozzolanic reaction of fly. These pozzolanic reaction products fill in pores and result in a refining of the.
A pozzolan, and there are many of them, is defined as siliceous or siliceous and aluminous materials which in themselves possess little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to. Pozzolanic reactions of common natural zeolites with lime and. For this purpose, four mortars were analyzed with three fixed parameters, namely the rice husk ash type. Sargent, in handbook of alkaliactivated cements, mortars and concretes, 2015. It is observed by many research ers that there is an increase of compressive strength of mortar with the use of pozzolanic materials. A pozzolan, and there are many of them, is defined as siliceous or siliceous and aluminous. Under this category, soil stabilization depends mainly on chemical reactions between stabilizer cementitious material and soilminerals pozzolanic materials to achieve the desired effect. Jan 01, 2000 pozzolanic reaction in the presence of chemical activators pozzolanic reaction in the presence of chemical activators shi, caijun. Xray diffraction xrd analysis indicated that the hydration products in control limenatural pozzolan pastes were calcium silicate hydrate csh and c 4 ah.
Pozzolanic or matrix engaged aggregates the current system for concrete mix design treats aggregates and cementitious material as mutually exclusive components. The pdf file you selected should load here if your web browser has a pdf reader plugin installed for example, a recent version of adobe acrobat reader if you would like more information about how to print, save, and work with pdfs, highwire press provides a helpful frequently asked questions about pdfs. Use of rice straw ash as pozzolanic material in cement mortar. Waste ceramic powder as a pozzolanic supplementary filler of. This chemical reaction between the siliceous andor siliceousalumina components. Mortars with these materials have been used since ancient times and the knowledge of their.
All fly ashes exhibit pozzolanic properties to some extent. This paper has dealt with the pozzolanic reaction products and mechanism in limepozzolan cement pastes in the presence of na 2 so 4 and cacl 2. In opposition to fratini methodology, chapelle 1958. For certain pozzolanas, the pozzolanic reaction is slower than portland cement hydration, with correspondingly lower rates of heat liberation and strength gain. Volcanic materials are a type of natural pozzolan formed during. So finally today im going to be sharing pdf files on quality control and monitoring project report i hope this is very powerful documents for all civil engineering students as well as employees who are working on site as a quality, site or structural engineers. Packing effect and pozzolanic reaction of fly ash and. Recent authors investigations have focussed on alumino. Sivakumar structural engineering division, school of mechanical and building science vit university, vellore abstract. Pozzolanic ash article about pozzolanic ash by the free.
The most often used mineral admixture in the modern concrete industry is the pozzolan. Owing to its hydraulic activity the absorption of milligrams of cao from 1 g of lime solution, pozzolana is used as a hydraulic additive in the production of binding materials called pozzolana cements. Pozzolanic reaction in the presence of chemical activators. The pozzolanic reaction process, which can either be modest or quite substantial depending on the mineralogy of the soil, is a long term. The fratini test is the basis of the actual en 1965 standard. The pozzolanic reaction of silica fume volume 1488 ole m. Pumice instead of fly ash for concrete improvement. Veiga2 abstract natural pozzolans from different origins were characterised and used to make limepozzolan mortars. Interaction between the pozzolanic reaction of fly ash and. The obtained results show that use of heat treatment. For a 30% replacement fraction, the pozzolanic reaction and. Pdf thermodynamic evaluation of pozzolanic reactions between. Analysis of the cementitious and pozzolanic properties of.
The hydrated phases produced during the pozzolanic reactions were c s h gels, c4ah. At a replacement fraction of 1020%, the combination of the pozzolanic reaction and the. Because of the relatively slower rate of pozzolanic reactions, a partial replacement. Download acrobat pdf file 170kb multimedia component 1. Cns addition on fly ash hydration and microstructure development of cementfly ash pastes were investigated. Pdf a kinetic study of the pozzolanic reaction of fly. Apr 01, 2000 pozzolanic reaction in the presence of chemical activators pozzolanic reaction in the presence of chemical activators shi, caijun. In soil modification, as clay particles flocculates, transforms natural plate like clays particles into needle like interlocking metalline structures. However, some fly ashes also display varying degrees of cementitious properties without the addition of. Pozzolanic material an overview sciencedirect topics. Alternatively, you can download the pdf file directly to your computer, from where it can be opened using a pdf reader. Furthermore, the pore properties of the matrix were evaluated using mercury intrusion porosimetry mip. Performance evaluation of steel substituted concretes a.
In this study, compressive strengths, modulus of rupture and rapid chloride migration coefficients have been determined and the investigation of microstructure has been carried out using scanning electron microscopy. Guide to external curing of concrete reported by aci committee 308 aci committee reports, guides, and commentaries are intended for guidance in planning, designing, executing, and inspecting construction. The beneficial effects of pozzolan addition in terms of higher compressive strength, performance and greater durability are mostly attributed to the pozzolanic reaction in which calcium hydroxide is consumed to produce additional csh and cah reaction products. This phenomenon, which is also referred to as salt weathering, occurs in concrete in contact with soils containing. Download a pumicevsfly ashcentric summary of the uof txaustin report pdf file. The aim of the present work is the study of the pozzolanic reactivity of rice husk ash in lime mortars and the evaluation of rice husk ash particle size effect in lime based mortars. This document is intended for the use of individuals. Pozzolanic reactions consume part of the soils water content. The pdf files below are from a growing collection of data sheets, research reports, product information, white papers, knowledge briefs and info graphics. Including a control and a hybrid mix 10% each of vuf and fa, eleven mortar. Can a roman style system be utilized where the aggregates themselves provide controlled reactions to engage with the cementitious matrix and contribute to a living, self healing system.
A more formal definition is given by astmc61884 as a siliceous or siliceous and aluminous material which, in itself, possesses little or no cementitious value but which will, in finely divided form in the. Microstructuralrelated durability of cementitious composites, rilem proceedings pro 83. Validation of a kineticdiffusive model to characterize. Dredge material stabilization using the pozzolanic or. What is the difference between a hydraulic and pozzolanic reaction. The utilisation of pozzolans as additions to cements results in added technical advantages of the construction materials.
Pozzolanic reaction of a biomass waste as mineral addition to cement based materials. Crack repair by activation of the pozzolanic or slag reaction. Packing effect and pozzolanic reaction of fly ash and ground. Download pdf infographic about the pozzolanic reaction that is engineered into us grout products to enhance grout performance.
In chemistry of cement, 12th international congress, proceedings. Zeolites generally show pozzolanic activity due to their structural characteristics. For portland cement concrete, this has the advantage of reducing the risk of early thermal cracking but. C4af ettringite and calorific synergic effect contribution. The quality of scms is evaluated by pozzolanic activity index pai and strength activity index sai, which measure the reaction between the amorphous part of pozzolana and calcium hydroxide. Packing effect and pozzolanic reaction of fly ash and ground river sand on porosity and air permeability of pastes. Article pdf available in journal of materials in civil engineering 298 march 2017 with 70 reads. This study focuses on evaluating the effect of the fineness of basaltic volcanic ash va on the engineering properties of cement pozzolan mixtures.
The results revealed that fly ash hydration is accelerated by cns at early age thus enhancing the early age strength of the materials. Much of the information is also relevant to the production of concrete products. In this context, an alternative is the use of pozzolanic materials replacing partially. Effect of fineness of basaltic volcanic ash on pozzolanic. Diffraction files pdf from the international centre for diffraction data icdd files. Natural pozzolans are used in mortars, concretes, and as components of blended cements. The potential use of supplementary cementitious materials in plain cement concrete for improving concrete properties has been a growing concern in recent years. Fresh property was done for all the replacement and hardened properties were done at 7, 14, 28, 56 and 91 days for. And finally, in order monitor the progress of the pozzolanic reaction, thermogravimetric analysis tga was used to quantify the amount of calcium hydroxide caoh 2 in the system. Free lime is released during the hydration of cement clinker and activates the pozzolanic reaction of fly ash, where it will be absorbed. Packing effect and pozzolanic reaction of fly ash and ground river sand on porosity and air permeability of pastes theerawat sinsiri1 chai jaturapitakkul2 prinya chindaprasirt3 1 department of civil engineering, suranaree university of technology, nakorn ratchasima 30000, email. Otherwise, the hydration products of a cementpozzolana blend are. For this purpose, two series of mortars were prepared by partially replacing cement with 5%, 10% and 15% of wfcc catalyst.
Effect of waste oilcracking catalyst incorporation on. Download pdf slide deck containing us grout technical data, performance advantages, applications, development, and more in a slide deck format. Pozzolanic reaction enhanced the interactions between ceramic grains and cement matrix. Fly ash, slag, silica fume, and natural pozzolans, chapter 3. This paper presents the results of three pozzolanic reactivity test methods, including chapelle test, fratinni test and strenght activity index sai methods, that were applied to metakaolin and other thermally treated clay, ashes and glass. Effect of pozzolanic additives on structure and chemical. The rate of the pozzolanic reaction is dependent on the intrinsic characteristics of the pozzolan such as the specific surface area, the chemical composition and. This compressive strength increase can be related to the formation of csh due to the pozzolanic reaction. The understood science behind the pozzolanic reaction is this.
This paper presents research on transport properties and alkalisilica reaction asr susceptibility of mortars containing a pozzolanic waste generated in the fluid catalytic cracking wfcc unit by the portuguese oilrefinery. Pozzolanic reactions continue to occur as long as calcium hydroxide is present, there is sufficient water for the reaction to occur, and there is available space for the reaction products to reside. Pozzolanic activity of sugarcane bagasse ash concrete kennedy aburili1, dr. C is at 28 days or longer, and the pozzolanic reaction of fly ash in cement paste highly depends upon the curing temperature. The main mechanism involves the transportation of calcium hydroxide via water within the. Pozzolanic reactions occur over long time scales months to years. However, some fly ashes also display varying degrees of cementitious properties without the addition of caoh2 or hydraulic cement. Gruyaert, elke, kim van tittelboom, h rahier, et al. Mechanisms of stabilization the national academies press. Physical properties and reactivity of pozzolans, and their. Graphing the test results shows that the calcium hydroxide contents of the scm pastes are generally always lower than that.
Article pdf available in journal of materials in civil engineering 298 march 2017 with 67 reads. Utilization of bagasse ash as a pozzolanic material in. Alternatively, you can download the file locally and open with any standalone pdf reader. Pozzolanic activity an overview sciencedirect topics. What is the difference between a hydraulic and pozzolanic. In this case the final hydration product of aluminous compounds in cement is assumed to be 3caoal 2o 3 6h 2o. Parametric study on use of pozzolanic materials in concrete. However, the pozzolanic reaction of fly ash at later age is significantly hindered due to the reduced ch. Analcime, phillipsite, chabazite, erionite, mordenite and clinoptiloliterich tuffs were mixed with portlandite and water 1.
It is intended to be read in conjunction with the relevant lafarge tarmac cement technical product datasheet. Download fulltext pdf additive to cementa pozzolanic materialfly ash article pdf available in international journal of engineering research 35. Pozzolanic cement this document summarises the general properties and applications of pozzolanic cement for use in in situ concrete. As happens in pozzolanic reactivity, alkaliactivation reactivity depends on the amorphous content of silica and aluminium. The pozzolanic reaction between portlandite and different types of nearly pure natural zeolites was studied. A simple everyday definition of pozzolan could be a finely powdered material which can be added to lime mortar or to portland cement mortar to increase durability. Alkali silica reaction asr biggest single difference between class f and class c ash ability to mitigate asr and sulfate attack class f first choice for mitigating asr pozzolanic consumes oh hydroxide central to asr some class c can also mitigate but much. Effect of fly ash on portland cement systems part ii. Pdf pozzolanic reaction of a biomass waste as mineral. As aforementioned, the progress of the pozzolanic reaction was investigated by recording newformed minerals and changes in the relative amounts of portlandite and calcite in the xrd trace. Evaluation of pozzolanic reactivity of artificial pozzolans. The sulphate ions react with the hydration products of cement, namely c3a and.
The inclusion of the right proportion of such pozzolanic additions stimulates portland cement hydration, i. Chemistry of cement, 12th international congress, proceedings, 2007. Activation of pozzolanic and latenthydraulic reactions by. Pozzolanic reaction pastes, as the precursors of fly. The increase in compressive strength could be attributed to the reduced water content, the filler effect, and the higher pozzolanic reaction. Dredge material stabilization using the pozzolanic or sulfo. An investigation on the pozzolanic reactivity of different. Fly ash, ground granulated blastfurnace slag, silica fume, and natural pozzolans, such as calcined shale, calcined clay or metakaolin, are materials that, when used in conjunction with portland or blended cement, contribute to the properties of the hardened concrete through hydraulic or pozzolanic activity or both fig. Using colloidal nano silica to enhance the performance of. In this study, the pozzolanic activity of a thermally treated natural mordenitetype zeolite from the palmarito openair deposit cuba was evaluated with respect to a nontreated zeolite. Validation of a kineticdiffusive model to characterize pozzolanic reaction kinetics in sugar cane strawclay ashlime systems. Pozzolanic activity of sugarcane bagasse ash concrete.
The rate of the pozzolanic reaction is dependent on the intrinsic characteristics of the pozzolan such as the specific surface area, the chemical composition and the active phase content. Pozzolans and the pozzolanic reaction springerlink. Pdf pozzolanic reaction mechanism of rice husk ash in. Activation of pozzolanic and latenthydraulic reactions by alkalis in order to repair concrete cracks. Interaction between the pozzolanic reaction of fly ash and the hydration of cement. Standard specification for pozzolanic blended materials in. To utilize alkaliactivated materials widely, this study investigates the effects of an intensified pozzolanic reaction and pore filling by silica fume on various material properties of limeactivated slag mortar. The pozzolanic reaction also leads to a lower heat evolution during hydration and a reduction in the portlandite content, with increased production of csh with implications for durability. The reactivity is linked to the material structure, being higher for higher amorphous content. The calcium hydroxide contents of the pastes were measured to observe whether the pozzolanic reaction was occurring in the scm pastes. New method to assess the pozzolanic reactivity of mineral.
To download the pdf, click the download link above. A number of methods, categorized as direct and indirect, have been developed for the qualitative and quantitative determination of these indices. Hess pumice productsan overview of our products, services and capabilities multipage pdf. Clay soils turn drier and less susceptible to water content changes roger et al, 1993. In contrast to siliceous reactions, pozzolanic reactions could be between lime and aluminious pozzolanic materials. Effects of colloidal nanosio2 on fly ash hydration academic. As the fa content increases the reaction ratio increases up to 30 mass%. Performance evaluation of steel fibre s in rice husk ash. Types of pozzolanic material definition and sources of. Comparisons, applications, and performance larry sutter michigan technological university. Measurement of pozzolanic activity index of scoria, pumice.
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