fa بررسی نقش ذرات سیلیس در ریزساختار و خواص مکانیکی کامپوزیت‌های ژئوپلیمری روش‌های نوین فرآوری و ساخت سرامیک‌ها New Methods of Processing and Fabrication of Ceramics پژوهشي Research <br> <span style="font-size:11pt"><span style="line-height:150%"><span style="direction:rtl"><span style="unicode-bidi:embed"><span calibri="" style="font-family:"><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">در این پژوهش ریزساختار و خواص مکانیکی کامپوزیت ژئوپلیمر بر پایه متاکائولن و ترکیب قلیایی سیلیکات پتاسیم با افزودن ذرات سیلیس مورد بررسی قرار گرفت. برای تعیین ترکیب بهینه، ابتدا نسبت‌های مولی مختلف</span></span></span> <span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">3/75، 3/50، 3/25، 3=</span></span></span><span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:"><span style="position:relative"><span style="top:8.5pt"><img alt="" id="_x0000_i1025" src="data:image/png;base64,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" style="width:21.75pt; height:21.75pt" > </span></span></span></span></span>&nbsp;<span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">x=</span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> و 1، 0/9، 0/8= </span></span></span><span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:"><span style="position:relative"><span style="top:8.5pt"><img alt="" id="_x0000_i1025" src="data:image/png;base64,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" style="width:21.75pt; height:21.75pt" > =</span></span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">y بررسی و ترکیب بهینه با نسبت مولی سیلیس به آلومینا برابر با 3/50</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">x=</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> و 0/9=</span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">y</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> با نام </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">G</span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> و استحکام خمشی برابر با 0/06</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%">&plusmn;</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">4/20 مگاپاسگال به دست آمد. ذرات سیلیس </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">(S)</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> با اندازه ذرات در محدوده 3/66 </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span arial="" style="font-family:">&ndash;</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> 527 میکرومتر به عنوان تقویت کننده ذره‌ای در مقدار 10، 15، 20 و 25 درصد وزنی به ترکیب ژئوپلیمر بهینه افزوده و استحکام مکانیکی و ریزساختار مورد بررسی قرار گرفت. افزودن 20 درصد وزنی سنگدانه سیلیسی </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">(S20)</span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> در شکل ظاهری نمونه‌های ژئوپلیمری و کاهش درصد انقباض خشک نمونه‌ها تاثیر قابل توجهی داشت. مقدار استحکام خمشی نمونه ژئوپلیمرکامپوزیتی </span></span></span><span dir="LTR" style="line-height:150%"><span new="" roman="" style="font-family:" times="">(GS20)</span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> برابر 0/21</span></span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%">&plusmn;</span></span><span lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">15 مگاپاسکال به دست آمد. این افزایش استحکام مکانیکی می‌تواند به دلیل نقش ذرات سیلیس در جلوگیری از پیشرفت ترک در ریزساختار کامپوزیت باشد.</span></span></span></span></span></span></span></span><br> &nbsp; <span style="font-size:11pt"><span style="line-height:150%"><span calibri="" style="font-family:"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">In this study, the microstructure and mechanical properties of a geopolymer composite based on metakaolin and an alkaline potassium silicate solution, were examined. To determine the optimal composition various molar ratios of </span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">x=</span></span> <span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:"><span style="position:relative"><span style="top:8.5pt"><img alt="" id="_x0000_i1025" src="data:image/png;base64,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" style="width:21.75pt; height:21.75pt" > </span></span></span></span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">=3, 3.25, 3.50, and 3.75, as well as y=</span></span><span style="font-size:11.0pt"><span style="line-height:107%"><span calibri="" style="font-family:"><span style="position:relative"><span style="top:8.5pt"><img alt="" id="_x0000_i1025" src="data:image/png;base64,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" style="width:21.75pt; height:21.75pt" > </span></span></span></span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">=0.8, 0.9, and 1 were evaluated. The optimal composition was identified with x=3.50 and y=0.9, designated as G, yielding a flexural strength of 4.20</span></span><span style="line-height:150%"><span arial="" style="font-family:">&plusmn;</span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">0.06 MPa. Silica particles (S), ranging in size from 3.66 to 527 micrometers, were introduced as a particulate reinforcement at weight fractions of 10%, 15%, 20%, and 25% into the optimized geopolymer composition, followed by an assessment of mechanical strength and microstructure. The addition of 20 wt% silica aggregate (S20) significantly influenced the appearance of geopolymer samples and reduced the percentage of drying shrinkage. The flexural strength of the geopolymer composite sample (GS20) was measured at 15</span></span><span style="line-height:150%"><span arial="" style="font-family:">&plusmn;</span></span><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">0.21 MPa. This improvement in mechanical strength as attributed to the role of SiO₂ particles in preventing crack propagation within the composite microstructure.</span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span style="line-height:150%"><span style="font-family:"B Nazanin""></span></span></span></span></span></span><br> &nbsp; ژئوپلیمر, سیلیس, استحکام مکانیکی, ریزساختار Geopolymer, SiO2, Mechanical strength, Microstructure 19 27 http://ijcse.ir/browse.php?a_code=A-10-85-7&slc_lang=fa&sid=1 Azam Moosavi اعظم موسوی کاشی moosavi2024@iau.ac.ir 10031947532846005374 10031947532846005374 Yes دانشگاه علوم و تحقیقات اردلان عالی پور ehsanea@gmail.com 10031947532846005375 10031947532846005375 No