مهندسی سازه و ساخت

مهندسی سازه و ساخت

بررسی اثر افزودنی منبسط‌شونده بر روی خواص بتن چاپ سه‌بعدی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه صنعتی شریف، تهران، ایران
2 دانشیار، دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران
3 دانشجوی دکتری، دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران
4 استادیار، دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران
5 دکتری، دانشکده مهندسی عمران، دانشگاه ای تی اچ زوریخ، زوریخ، سوئیس
6 استاد، دانشکده مهندسی عمران، دانشگاه تهران، تهران، ایران
7 کارشناسی ارشد، دانشکده مهندسی عمران، دانشگاه علم و صنعت، تهران، ایران
چکیده
ﻓﻨﺎوری ﭼﺎپ سه‌ﺑﻌﺪی ﺑﺘﻦ که زیر شاخه‌ای از روش ساخت‌ افزایشی است، ﺑﺎ ﺳﺮﻋﺖ ﺧﯿﺮهﮐﻨﻨﺪه‌ای (از نظر زیرساختی) در ﺳﺎلﻫﺎی اﺧﯿﺮ ﭘﯿﺸﺮﻓﺖ ﮐﺮده اﺳﺖ. با این وجود یکی از چالش‌های اساسی این فناوری ساخت، جمع‌شدگی بتن چاپ سه‌بعدی است. عدم وجود قالب، آب انداختگی کم، نسبت پایین سنگ‌دانه به خمیر و ریزی سنگ‌دانه‌ها باعث بحرانی شدن جمع‌شدگی این نوع بتن‌ها گشته است. به همین جهت در این مقاله قصد بر این است که با استفاده از ماده منبسط‌شونده، جمع‌شدگی بتن چاپ سه‌بعدی را کاهش داد و تا حد امکان آن را کنترل کرد و همچنین تأثیر میزان استفاده از ماده افزودنی را بردیگر خواص بتن، اعم از خواص مکانیکی، خواص بتن‌تازه و خواص بتن سه‌ﺑﻌﺪی مورد سنجش قرار داد. در این مقاله، 5 طرح با نسبت‌های ماده منبسط‌شونده ﺑﻪ خمیر 0.3، 0.6، 0.9، 1.2 و 1.5 درصد و یک طرح فاقد منبسط‌شونده (طرح مبنا) جهت بررسی آزمایشگاهی انتخاب شدند. ارزیابی جمع‌شدگی آزاد 6 طرح ذکر شده تا سن 177 روز نشان‌دهنده کاهش 30% جمع‌شدگی به‌ازای استفاده 1% ماده منبسط‌شونده است. رابطه مستقیم بین افت جرم و جمع‌شدگی نمونه‌ها حاکی از این امر است که در آزمایش انجام‌گرفته، قسمت اصلی جمع‌شدگی اندازه‌گیری شده در اثر از دست دادن آب بوده است. افزودن 1% ماده منبسط‌شونده منجر به کاهش 18% در مقاومت فشاری نمونه‌ها در سنین 7 و 28 روز گردیده است، در حالی که هر درصد افزایش این ماده بیشتر از یک درصد باعث کاهش 17% در مقاومت کششی (خمشی) نمونه‌ها در سن 28 روز می‌شود. به علاوه هر درصد افزایش در استفاده از این ماده در 6 طرح موردنظر، منجر به افزایش 11% در میزان بازشدگی آزمایش میز جریان گردیده است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Studying the Effect of Expansive Agents on 3D-Printed Concrete Properties

نویسندگان English

Mohammad Reza Daneshpasand 1
Amir Mohammad Ramezanianpour 2
AmirAli Ziarati 3
Moslem Shaverdi 4
Abdollah Sadeghi Marzaleh 5
Morteza Eskandari-ghadi 6
Nima Zafarmomen 7
1 Ph.D. Candidate, School of Civil Engineering, Sharif University of Technology, Tehran, Iran
2 Associate Professor, School of Civil Engineering, University of Tehran, Tehran, Iran
3 Ph.D. Candidate, School of Civil Engineering, University of Tehran, Tehran, Iran
4 Assistant Professor, School of Civil Engineering, University of Tehran, Tehran, Iran
5 Ph.D., Institute of Structural Engineering, ETH Zurich, Zurich, Switzerland
6 Full Professor, School of Civil Engineering, University of Tehran, Tehran, Iran
7 M.Sc. graduate, School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده English

3D printed concrete (3DPC) is a subset of additive manufacturing technology that has gained significant attention in recent years. However, one of the fundamental challenges of this technology is the shrinkage of 3DPC. The absence of formwork, low water-cement ratio, and fine aggregate characteristics pose critical challenges in the shrinkage of these types of concrete. Therefore, this article aims to reduce and control the shrinkage of 3DPC using an expansive admixture. Additionally, it evaluates the impact of the admixture on various concrete properties, including mechanical properties, fresh concrete properties, and 3DPC properties. In this study, five mix designs with expansive admixture proportions of 0.3%, 0.6%, 0.9%, 1.2%, and 1.5%, as well as one design without the admixture (the reference design), were selected for laboratory testing. The evaluation of free shrinkage for all six designs over a 177-day period indicates a 30% reduction in shrinkage when utilizing 1% of the expansive admixture. The direct relationship between mass loss and shrinkage in the tested specimens suggests that the majority of the measured shrinkage is attributable to water loss. The addition of 1% of the expansive admixture results in an 18% decrease in the compressive strength for the 7- and 28-day specimens, while each percentage increase in this admixture results in a 17% decrease in tensile (flexural) strength for the specimens at 28 days. Furthermore, each percentage increase in the use of this admixture in the six selected mix designs results in an 11% increase in the flow table test slump.

کلیدواژه‌ها English

3D Printed concrete
Additive manufacturing
Shrinkage
Expansive admixture
Buildability
Pumpability
Printability
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  • تاریخ دریافت 26 آبان 1402
  • تاریخ بازنگری 25 شهریور 1403
  • تاریخ پذیرش 14 دی 1402