بررسی ریزساختار و مقاومت فشاری ملات، خمیر و بتن ژئوپلیمر
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بررسی ریزساختار و مقاومت فشاری ملات، خمیر و بتن ژئوپلیمر

عنوان فارسی مقاله: مروری بر بررسی ریزساختار و مقاومت فشاری ملات، خمیر و بتن ژئوپلیمر
عنوان انگلیسی مقاله: A review on microstructural study and compressive strength of geopolymer mortar, paste and concrete
مجله/کنفرانس: ساخت و ساز و مصالح ساختمانی - Construction and Building Materials
رشته های تحصیلی مرتبط: مهندسی عمران
گرایش های تحصیلی مرتبط: مدیریت ساخت، سازه، خاک و پی
کلمات کلیدی فارسی: خمیر ژئوپلیمر و ملات، ریزساختار، مقاومت فشاری، آلومینوسیلیکات، فعال کننده قلیایی، ریزترک
کلمات کلیدی انگلیسی: Geopolymer paste and mortar، Microstructure، Compressive strength، Aluminosilicate، Alkali activator، Microcracks
نوع نگارش مقاله: مقاله مروری (Review Article)
نمایه: Scopus - Master Journal List - JCR
شناسه دیجیتال (DOI): https://doi.org/10.1016/j.conbuildmat.2018.07.075
دانشگاه: Centre for Innovative Construction Technology (CICT), Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
ناشر: الزویر - Elsevier
نوع ارائه مقاله: ژورنال
نوع مقاله: ISI
سال انتشار مقاله: 2018
ایمپکت فاکتور: 4/686 در سال 2018
شاخص H_index: 129 در سال 2019
شاخص SJR: 1/522 در سال 2018
شناسه ISSN: 0950-0618
شاخص Quartile (چارک): Q1 در سال 2017
فرمت مقاله انگلیسی: PDF
تعداد صفحات مقاله انگلیسی: 27
وضعیت ترجمه: ترجمه نشده است
قیمت مقاله انگلیسی: رایگان
آیا این مقاله بیس است: خیر
کد محصول: E11252
فهرست انگلیسی مطالب

Abstract


1- Introduction


2- Geopolymerization


3- Review of literature


4- Conclusion


References

نمونه متن انگلیسی مقاله

Abstract


The utmost priority in reducing the usage of ordinary Portland cement (OPC) while replicating the cementitious properties by utilizing industrial by-products in construction materials is seriously undertaken by many researchers. The technology of geopolymerization that utilizes materials and activator solution to form geopolymer matrix could lead to alleviate some of the issues related to OPC based concrete. Numerous experiments have established that geopolymer concrete has higher compressive strength, higher acid resistivity and lower shrinkage than ordinary concrete. This review article focusses on the microstructure analyses of the geopolymer specimens and comparison of geopolymers with various binders. The review analysis of various binders used and their microstructural investigations reveal that different molarity of sodium hydroxide or phosphoric acid solution, liquid-to-binder ratio, curing temperature and duration yield geopolymers of diverse properties. Most of the geopolymer products revealed a wide hump in the XRD analysis due to the amorphous structure of aluminosilicate. Investigation of MIP and Micro CT reveals that aged geopolymer has a denser matrix arrangement and produce high compressive strength. Geopolymerization prevents interconnectivity of micropores due to the formation of denser matrix of geopolymer gel. Generally, the use of 12M of sodium hydroxide solution, low liquid-to-binder ratio of about 0.4 and curing temperature at approximately 70 °C for at least 24 h produced high strength geopolymers. The binders mixed with lower sodium silicate to sodium hydroxide mass ratio of 2.0–2.5 tend to react more efficiently.


Introduction


It is well known that limestone hills were being harvested for cement manufacturing throughout the world and that lead to ecological imbalance [1]. As concrete is the most widely used construction material, the exploitation of natural resources such as sand and coarse aggregate pressured construction industry to look for alternatives for these materials; thus, the use of alternative construction materials is on the rise and many research works are being carried out through the globe. Cement manufacturers rely on limestone as it is the major source in ordinary Portland cement. For the conversion of limestone to calcium oxide, the cement kiln heats all the raw materials at high temperature. Fuel used in heating may be coal, natural gas, sawdust and methane gas or a combination of these fuels. Both the chemical conversion and firing process release carbon dioxide (CO2), which is the main component in greenhouse gas. Alnahhal et al. [2] reported that about 2.8 billion tonnes of cement products manufactured every year and this in turn produces about 5–7% of the global CO2 emissions [3,4]. Based on a report by Department of Statistic Malaysia, roughly 20 Mega tonnes of cement were produced in 2016 [5]. It has been reported that the production of cement, besides consuming the natural resources, it also destroys the natural habitat of flora and fauna [1]. Since the beginning of 1990s, the term sustainability has gained significance among all engineering community and more focused works are being systematically carried out throughout the globe in diverse areas of engineering process and products. Thus, more researches have been carried out in the area of building materials, especially on cement-based products by using diverse cement replacement materials which fulfill both the sustainability criterion to conserve the natural resources and preserve the environment.

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