پیوندهای مفید
آمار
| تعداد نشریات | 9 |
| تعداد شمارهها | 446 |
| تعداد مقالات | 5,719 |
| تعداد مشاهده مقاله | 8,018,449 |
| تعداد دریافت فایل اصل مقاله | 6,527,280 |
بررسی اثر مقایسهای الیاف ماکرو و میکرو پلیپروپیلن بر کنترل یا کاهش ترکخوردگیهای ناشی از جمعشدگی خمیری در روسازیهای بتنی در شرایط دمایی بالا | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 1، دوره 53، شماره 1، فروردین 1400، صفحه 3-20 اصل مقاله (2.51 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2020.18767.6957 | ||
| نویسندگان | ||
| سید جواد وزیری کنگ علیائی1؛ حسن فضایلی* 2 | ||
| 1گروه راه و ترابری، دانشکده مهندسی عمران، دانشگاه علم و صنعت ایران، تهران، ایران | ||
| 2گروه مهندسی عمران، دانشگاه آزاد اسلامی واحد تهرات- شمال، تهران، ایران | ||
| چکیده | ||
| ترکخوردگی ناشی از جمعشدگی خمیری در روسازی بتنی، محلی برای ورود آب و مواد خورنده به داخل روسازی بوده و باعث کاهش دوام و در نهایت شکست دال روسازی میگردد. استفاده از الیاف، یکی از راههای کنترل و کاهش این ترکها است. این پژوهش، به بررسی اثر افزودن الیاف پلیمری ماکرو در مقایسه با الیاف پلیمری میکرو بر ترکخوردگی ناشی از جمعشدگی خمیری بتن، میپردازد. بدین منظور از یک نوع الیاف میکرو پلیپروپیلن و دو نوع الیاف ماکرو پلیپروپیلن در درصد حجمی 1.0 %در ساخت نمونهها استفاده شد. آزمایشهای مکانیکی شامل مقاومت فشاری و خمشی و آزمایش ارزیابی ترکخوردگی ناشی از جمعشدگی خمیری بر اساس 1579 C ASTM در شرایط محیطی شامل رطوبت نسبی هوا 20 ،%سرعت جریان باد 30 کیلومتر بر ساعت و در دو دمای 35 و 40 درجه سانتیگراد انجام شد. نتایج نشان داد نمونههای بتن حاوی هر دو نوع الیاف ماکرو و میکرو در کنترل ترکخوردگیها عملکرد مناسب تری نسبت به نمونههای شاهد داشتند. در این میان، الیاف میکرو در کنترل عرض ترکخوردگی در هر دو دمای آزمایش شده، عملکرد بهتری داشتند. در مقابل، الیاف ماکرو در کاهش طول ترکخوردگی، به ویژه در دماهای بالاتر، اثر بهتری از خود نشان دادند. استفاده از الیاف ماکرو میتواند تا حد قابل توجهی منجر به کاهش ابعاد و مساحت ترکخوردگی ناشی از جمعشدگی خمیری در روسازیهای بتنی گردد. | ||
| کلیدواژهها | ||
| روسازی بتنی؛ ترکخوردگی ناشی از جمعشدگی خمیری؛ شرایط دمایی بالا؛ الیاف ماکرو پلیپروپیلن؛ الیاف میکرو پلیپروپیلن | ||
| موضوعات | ||
| انواع خرابی روسازی صلب؛ تعمیر و تقویت روسازی؛ تکنولوژی بتن؛ دوام بتن | ||
| عنوان مقاله [English] | ||
| Investigation of Comparative Effect of Macro and Micro Polypropylene Fibers on Controlling or Mitigation of Plastic Shrinkage Cracking in Concrete Pavements in High-Temperature Conditions | ||
| نویسندگان [English] | ||
| Seyed Javad Vaziri Kang Oleyaei1؛ Hassan Fazaeli2 | ||
| 1Transportation, school of civil engineering, Iran University Of science and Technology, Tehran,Iran | ||
| 2School of civil engineering,Islamic Azad University Tehran-North branch,Tehran,Iran | ||
| چکیده [English] | ||
| Plastic shrinkage cracking in concrete pavement is a place for ingression of water and corrosive substances to the pavement, which reduces its durability and ultimately leads to failure of the pavement slab. The use of fibers is one way to control these cracks. This study investigates the effect of the addition of macro polymer fibers in comparison with micro polymer fibers on plastic shrinkage cracking in concrete pavements. For this purpose, one type of micro polypropylene fibers and two types of macro polypropylene fibers in a volume of 0.1% was used to make the samples. Mechanical tests including compressive, tensile, and flexural strengths and evaluation of plastic shrinkage cracking according to ASTM C 1579 in climate conditions including relative humidity of 20%, wind speed of 30 km/h, and temperatures of 35 and 40 Celsius degrees, were performed. The results showed that concrete samples containing both macro and microfibers had better performance in controlling cracks than control samples. Meanwhile, microfibers performed better in controlling crack width at both temperature conditions. In contrast, macro fibers showed a better effect in reducing the length of cracking, especially at higher temperatures. The use of macro fibers can significantly reduce the length and area of plastic shrinkage cracking in concrete pavements. | ||
| کلیدواژهها [English] | ||
| Concrete pavement, Plastic shrinkage cracking, High- temperature conditions, Macro Polypropylene fibers, Micro Polypropylene fibers | ||
| مراجع | ||
|
[1] Design, Construction and Maintenance Manual for Highways Concrete Pavements No.731in, The Ministry of Road & Urban Development. Deputy of Technical, Infrastructure and Production Affairs 2017. [2] N.J. Delatte, Concrete pavement design, construction, and performance, Crc Press, 2014. [3] F. Faisal, B. Nitin, Effects of steel fibers and Silica fume on Compressive and flexural Strength of pavement Concrete, Lovely Professional University, 2017. [4] P.-m. Zhan, Z.-h. He, Application of shrinkage reducing admixture in concrete: A review, Constr. Build. Mater., 201 (2019) 676-690. [5] S. Ghourchian, M. Wyrzykowski, M. Plamondon, P. Lura, On the mechanism of plastic shrinkage cracking in fresh cementitious materials, Cem. Concr. Res., 115 (2019) 251-263. [6] P. Ghoddousi, A.A.S. Javid, M.A. Etebari, Investigation of the effect of capillary pore pressure on paste shrinkage of concrete mixtures containing microsilica and metakaolin and its relationship with tensile strength of early ages., New Approaches in Civil Engineering, 3(2) (2019). [7] R. Combrinck, M. Kayondo, B. le Roux, W. de Villiers, W. Boshoff, Effect of various liquid admixtures on cracking of plastic concrete, Constr. Build. Mater., 202 (2019) 139-153. [8] R. Combrinck, W.P. Boshoff, Tensile properties of plastic concrete and the influence of temperature and cyclic loading, Cem. Concr. Compos., 97 (2019) 300-311. [9] P. Zhao, A.M. Zsaki, M.R. Nokken, Using digital image correlation to evaluate plastic shrinkage cracking in cement-based materials, Constr. Build. Mater., 182 (2018) 108-117. [10] A.A.S. Javid, Mechanisms and strategies to increase the durability of concrete against plastic settelement, plastic shrinkage and drying cracking, in: First National Conference on Concrete Durability, Tehran,iran, 2018. [11] G. Moelich, R. Combrinck, A weather data analysis method to mitigate and prevent plastic shrinkage cracking, Constr. Build. Mater., 253 (2020) 119066. [12] D. Meyer, W.P. Boshoff, R. Combrinck, Utilising super absorbent polymers as alternative method to test plastic shrinkage cracks in concrete, Constr. Build. Mater., 248 (2020) 118666. [13] E. Booya, K. Gorospe, H. Ghaednia, S. Das, Free and restrained plastic shrinkage of cementitious materials made of engineered kraft pulp fibres, Constr. Build. Mater., 212 (2019) 236-246. [14] S. Ghourchian, M. Wyrzykowski, L. Baquerizo, P. Lura, Susceptibility of Portland cement and blended cement concretes to plastic shrinkage cracking, Cem. Concr. Compos., 85 (2018) 44-55. [15] A.Z. Bendimerad, E. Rozière, A. Loukili, Plastic shrinkage and cracking risk of recycled aggregates concrete, Constr. Build. Mater., 121 (2016) 733-745. [16] M. Wyrzykowski, P. Trtik, B. Münch, J. Weiss, P. Vontobel, P. Lura, Plastic shrinkage of mortars with shrinkage reducing admixture and lightweight aggregates studied by neutron tomography, Cement and Concrete Research, 73 (2015) 238-245. [17] H.-G. Kwak, S. Ha, W.J. Weiss, Experimental and numerical quantification of plastic settlement in fresh cementitious systems, Journal of materials in Civil Engineering, 22(10) (2010) 951-966. [18] R. Combrinck, Cracking of Plastic Concrete in Slab-Like Elements, Stellenbosch: Stellenbosch University, 2016. [19] I. Bertelsen, L. Ottosen, G. Fischer, Influence of fibre characteristics on plastic shrinkage cracking in cement-based materials: A review, Constr. Build. Mater., 230 (2020) 116769. [20] ASTM D7508 / D7508M-20, Standard Specification for Polyolefin Chopped Strands for Use in Concrete, ASTM International, West Conshohocken, PA, 2020, in. [21] M. Kayondo, R. Combrinck, W. Boshoff, State-of-the-art review on plastic cracking of concrete, Constr. Build. Mater., 225 (2019) 886-899. [22] H. Rooholamini, A. Hassani, M. Aliha, Evaluating the effect of macro-synthetic fibre on the mechanical properties of roller-compacted concrete pavement using response surface methodology, Construction and Building Materials, 159 (2018) 517-529. [23] A. Shafiepour, S. Shabani, F. Faezi, Effects of Dimensions and Amount of Polymer Fibers on the Strength and Durability of Roller-Compacted Concrete under Freeze-Thaw cycling, Amirkabir Journal of Civil Engineering, (2019). [24] J. LaHucik, S. Dahal, J. Roesler, A.N. Amirkhanian, Mechanical properties of roller-compacted concrete with macro-fibers, Construction and Building Materials, 135 (2017) 440-446. [25] S.A. Altoubat, J.R. Roesler, D.A. Lange, K.-A. Rieder, Simplified method for concrete pavement design with discrete structural fibers, Construction and Building Materials, 22(3) (2008) 384-393. [26] G.S. Islam, S.D. Gupta, Evaluating plastic shrinkage and permeability of polypropylene fiber reinforced concrete, Int. J. Sustainable Built Environ., 5(2) (2016) 345-354. [27] P. Soroushian, F. Mirza, A. Alhozajiny, Plastic shrinkage cracking of polypropylene fiber reinforced concrete, Materials Journal, 92(5) (1993) 553-560. [28] Z. Bayasi, M. McIntyre, Application of fibrillated polypropylene fibers for restraint of plastic shrinkage cracking in silica fume concrete, Materials Journal, 99(4) (2002) 337-344. [29] R. Gupta, N. Banthia, Correlating plastic shrinkage cracking potential of fiber reinforced cement composites with its early-age constitutive response in tension, Materials and structures, 49(4) (2016) 1499-1509. [30] J.-H.J. Kim, C.-G. Park, S.-W. Lee, S.-W. Lee, J.-P. Won, Effects of the geometry of recycled PET fiber reinforcement on shrinkage cracking of cement-based composites, Composites Part B: Engineering, 39(3) (2008) 442-450. [31] R.P. Borg, O. Baldacchino, L. Ferrara, Early age performance and mechanical characteristics of recycled PET fibre reinforced concrete, Construction and Building Materials, 108 (2016) 29-47. [32] S.-J. Lee, J.-P. Won, Shrinkage characteristics of structural nano-synthetic fibre-reinforced cementitious composites, Composite Structures, 157 (2016) 236-243. [33] A. Mazzoli, S. Monosi, E.S. Plescia, Evaluation of the early-age-shrinkage of Fiber Reinforced Concrete (FRC) using image analysis methods, Construction and Building Materials, 101 (2015) 596-601. [34] Chemical and Physical properties of Cement Type 1-425, in, Shargh Cement Co.https://www.sharghcement.ir/index.php?pgrec=produce_type1_425. [35] G. Olivier, R. Combrinck, M. Kayondo, W.P. Boshoff, Combined effect of nano-silica, super absorbent polymers, and synthetic fibres on plastic shrinkage cracking in concrete, Construction and Building Materials, 192 (2018) 85-98. [36] J. Branston, S. Das, S.Y. Kenno, C. Taylor, Influence of basalt fibres on free and restrained plastic shrinkage, Cement and Concrete Composites, 74 (2016) 182-190. [37] Image Analysing Software, Digimizer, in, MedCalc Software's VAT registration number is BE 0809 344 640. https://www.digimizer.com/index.php. [38] T. Merhej, L.L. Cheng, D.C. Feng, Polypropylene fiber reinforced concrete for rigid airfield pavement, in: Advanced Materials Research, Trans Tech Publ, 2011, pp. 627-633. [39] S. Wtaife, A. Alsabbagh, T. Eissa, E. Alshammari, A. Shaban, N. Suksawang, Analysis of Flexural Capacity of Fiber Reinforced Concrete Pavements, International Journal of Technology and Engineering Studies, 4(6) (2018) 203-210. [40] J.R. Roesler, S.A. Altoubat, D.A. Lange, K.-A. Rieder, G.R. Ulreich, Effect of synthetic fibers on structural behavior of concrete slabs-on-ground, ACI materials journal, 103(1) (2006) 3. [41] L.G. Sorelli, A. Meda, G.A. Plizzari, Steel fiber concrete slabs on ground: a structural matter, ACI Structural Journal, 103(4) (2006) 551.
| ||
|
آمار تعداد مشاهده مقاله: 1,113 تعداد دریافت فایل اصل مقاله: 1,465 |
||