بررسی آزمایشگاهی عملکرد مکانیکی بتن حاوی شیشه و لاستیک ضایعاتی در دمای بالا

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
رامین جعفری 1
محمدهادی علیزاده الیزیی 2
مسعود ضیائی 3
رضا اسمعیل آبادی 2
1 دانشگاه آزاد واحد رودهن
2 دانشگاه آزاد اسلامی، واحد رودهن
3 دانشگاه گرمسار
10.22034/23.1.12
چکیده
شیشه و لاستیک از جمله مواد بسیار پر مصرف در دنیا هستند که با توجه به ماهیت و نوع مصرفشان دارای ضایعات بسیاری می‌باشند. تغییرشکل و استفاده مجدد از این ضایعات یکی از راهکارهای بهبود وضعیت پایدار محیط زیست می‌باشد. کاربرد مصالح بازیافتی در صنایع مختلفی از جمله صنعت ساختمان رواج بسیاری یافته است. از طرف دیگر، بتن یکی از مصالح بسیار کاربردی در صنعت ساختمان است و اضافه کردن خرده‌های لاستیک و شیشه در بتن می‌تواند باعث بهبود برخی از خصوصیات مکانیکی و دینامیکی آن ‌شود. همچنین، مقاومت بتن در برابر حرارت نیز بسیار حائز اهمیت می‌باشد که با اضافه کردن لاستیک و شیشه ضایعاتی می‌توان آن را ارتقا داد. در این تحقیق اثر جایگزینی لاستیک با درصدی از سنگدانه‎های ریز و درشت بتن و پودر شیشه با درصدی از سیمان بتن تحت دمای بالا مورد مطالعه قرار گرفته است. به این ترتیب که نمونه‌های بتنی حاوی لاستیک و شیشه با درصدهای مختلف جایگزینی، ساخته شده است. سپس تعدادی از نمونه‌ها بدون قرار گرفتن تحت حرارت و تعدادی دیگر پس از قرار گرفتن تحت دمای 600 درجه سانتی‌گراد، مورد آزمایش مقاومت فشاری و کششی پسماند قرار گرفتند. بررسی ریزساختار بتن حاوی شیشه و لاستیک، توسط میکروسکوپ الکترونی روبشی (SEM) انجام شده است. نتایج این تحقیق نشان داد اضافه کردن لاستیک و شیشه به بتن باعث کاهش مقاومت فشاری و افزایش مقاومت کششی می‌شود. با مقایسه مجموع نمونه‌های حرارت ندیده و حرارت دیده می‌توان نتیجه گرفت که حرارت 600 درجه سانتی‌گراد، به‌طور متوسط حدود 33 درصد از مقاومت فشاری کاسته است. به‌طور کلی بتن‌های ساخته شده با 10 درصد جایگزینی لاستیک به‌جای درشت‌دانه و 15 درصد شیشه به‌جای سیمان عملکرد بهتری در دمای محیط و دمای بالا نشان دادند. همچنین در بررسی ریزساختار بتن، چسبندگی بین لاستیک و بتن مناسب بود.

کلیدواژه‌ها

موضوعات

عنوان مقاله English

Laboratory Study of Mechanical Performance of Concrete Containing Waste Glass and Rubber at High Temperature

نویسندگان English

R. Jafari 1
M. Alizadeh Elizei 2
M. Ziaei 3
R. Esmaeil Abadi 2
1 Azad University, Roodehen Branch
2 Islamic Azad University, Roodehen Branch
3 Garmsar University
چکیده English

With the advancement of technology in the world, industrial waste has become one of the most important environmental challenges. Deformation and reuse of these wastes is one of the ways to improve the sustainable state of the environment. Glass and rubber are among the most widely used materials in the world, which due to their nature have a lot of wastes. Waste tires cause a lot of environmental pollution due to their non-degradable materials. The use of waste glass and rubber in the construction industry can be a good solution in reusing waste materials. Concrete, on the other hand, is one of the most widely used materials in the construction industry, and the addition of rubber and glass crumb to concrete can improve some of its mechanical and dynamic properties. Of course, heat resistance of materials is one of the features that is effective in the type of application. Adding waste rubber and glass to concrete, of course, depending on their amount and size can increase the heat resistance of concrete to some extent.

In this research, the effect of replacing small and large aggregates with rubber and also glass powder with cement in concrete at ambient temperature and high temperature has been studied. The size of rubber used in concrete in two categories is 1 to 3 mm and 5 to 10 mm, which are replaced by fine-grained and coarse-grained, respectively, with replacement values ​​of 0, 5 and 10%. The size of the glass used is smaller than 75 microns and it can be replaced with cement with 0, 10, 15 and 20% replacement values. Shredded truck tires and powdered construction glass were used. In this study, cubic specimens were made into 15 x 15 x 15 cm specimens and cylindrical specimens with a diameter of 15 cm and a height of 30 cm were made according to the standards and processed for 28 days in optimal conditions. After processing, the number of cubic and cylindrical specimens was subjected to compressive and tensile tests. A number of other samples were placed in an electric furnace and heated to 600 ° C as standard. After removing the samples from the furnace, they were naturally placed at room temperature for 24 hours and then they were tested for the Residual compressive and tensile strength. The microstructure of concrete containing glass and rubber was examined by scanning electron microscope (SEM). The results of this study showed that adding rubber and glass to concrete causes a decreases compressive strength and increases tensile strength. The D10C10 design, which has the highest compressive strength, has a resistance reduction of about 12% compared to the reference design. The highest tensile strength of heated samples is related to D5C15 design, which is about 43% higher than the heated reference design. By comparing the sum of heated and unheated samples, it can be seen that heat at 600 ° C has reduced the compressive strength by an average of about 33%. In general, concrete made with 10% replacement of rubber instead of coarse in unheated samples and 15% glass instead of cement in heated samples showed better properties. Also, in the study of concrete microstructure, adhesion between rubber and concrete was appropriate.

کلیدواژه‌ها English

concrete
Glass powder
Waste rubber
High temperature
residual strength
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مهندسی عمران مدرس
دوره 23، شماره 1
فروردین و اردیبهشت 1402
صفحه 179-192