دانلود رایگان مقاله لاتین ترکیب زئولیت طبیعی از سایت الزویر
عنوان فارسی مقاله:
خواص پایداری و مکانیکی بتن ترکیبی زئولیت طبیعی
عنوان انگلیسی مقاله:
Mechanical and durability properties of concretes incorporating natural zeolite
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Concrete is a fundamental component of modern infrastructure, which is why its strength and durability play an important role. The properties of concrete in most cases depend on Portland cement, which remains the main hydraulic binder in use today. It is known that a partial substitution of cement by pozzolans results in an increase in durability of the concrete and, as a result, the service life of concrete structures [1,2]. Among the most common natural pozzolanic materials such as fly ash and silica fume is zeolite, which is used in some regions of the world, because of its lower cost and accessibility [3–5]. Although natural zeolites are crystalline, they show proper pozzolanic activity [6]. According to Uzal and Turanli [7] a lime reactivity of the clinoptilolite zeolite is comparable to silica fume, higher than fly ash and a non-zeolitic natural pozzolan. Therefore calcium hydroxide as a cement hydration product combines with natural zeolite consisting of reactive SiO2 and Al2O3 to form calcium hydrosilicates [7,8]. It was confirmed by many researchers [1,6–8], that the pozzolanic reaction in pastes containing zeolite of clinoptilolite type considerably decreased the calcium hydroxide content. The reduction of free Ca(OH)2 in the hardened concrete improves the durability and concrete becomes more resistant to lime leaching by flowing waters and to expansion due to sulfate attack [8,9]. Chan and Ji [10] concluded that zeolite is more effective than pulverized fuel ash but worse than silica fume in improving the compressive strength. A number of studies show that the optimal amount of zeolite replacement level is approximately 10% [11–13]. A higher amount of zeolite replacing cement in concrete causes reduction of compressive strength.
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کلمات کلیدی:
Mechanical and durability properties of concretes incorporating ... yadda.icm.edu.pl/.../bwmeta1.element.baztech-b793fc0c-adec-4ad6-9440-36c74026e5b... by T Markiv - 2016 - Cited by 5 - Related articles This paper investigates the application of natural zeolite as a substitute of cement in concrete. It studies the mechanical and durability properties of concretes ... [PDF]concrete made with zeolite and metakaolin: a comparison on the ... - Sid www.sid.ir/en/VEWSSID/J_pdf/103820130403.pdf by R Madandoust - 2013 - Cited by 7 - Related articles Apr 3, 2013 - properties of concrete mixtures containing natural zeolite (NZ) and .... In this study, concrete mixtures incorporating 20% replacement of NZ or ... [PDF]influence of natural zeolite on some properties of mortar/concrete www.gf.uns.ac.rs/~zbornik/doc/NS2015.006.pdf by T Milović - Related articles Apr 24, 2015 - the properties of mortar/concrete (used as a partial replacement of cement), ... Keywords: Natural zeolite, fly ash, mortar, concrete, compressive strength, durability. 1. .... Incorporation of 10% and 20% NZ led to decrease of the. Effect of Natural Zeolite-Pozzolan on Compressive Strength of Oil ... civilejournal.org/index.php/cej/article/view/219 by H Shahrabadi - 2017 - Related articles "Micro and macro level properties of natural Zeolite contained concretes. ... high performance concrete incorporating natural Zeolite, silica fume and fly ash. [PDF]Long-Term Properties of Special Concrete with Natural ... - Claisse.info www.claisse.info/2016%20papers/S156.pdf Natural zeolite (NZ) is a volcanic rock with good pozzolanic properties. ..... Consolidating High Performance Concrete Incorporating Natural Zeolite, Silica Fume ... Handbook of Natural Zeolites - Page 689 - Google Books Result https://books.google.com/books?isbn=1608052613 Vassilis J. Inglezakis, Antonis A. Zorpas - 2012 - Nature 100 51] UCUHUUI EICDI'IIIUI 90 - U N aturaI zeulrte El Natural zeoIite Bu _ ... the characteristics of cement and concrete composites incorporating natural ...
