بررسی خواص مکانیکی و شکست روسازی های بتنی تک لایه و دولایه

نوع مقاله : پژوهشی اصیل (کامل)

نویسندگان
1 دانشجوی دکتری راه وترابری ، دانشکده مهندسی عمران، دانشگاه سمنان
2 استاد دانشکده مهندسی عمران، دانشگاه سمنان
3 استاد دانشکده دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس
چکیده
بمنظور گسترش روسازی های بتن غلتکی در راه ها با سرعت زیاد، اجرای یک لایه نازک از بتن با مقاومت لغزشی بالا بر روی بتن غلتکی و بلافاصله پس از اجرای آن پیشنهاد می­شود. در پژوهش حاضر به بررسی خواص مکانیکی و شکست اینگونه از روسازی­های بتنی دو لایه­ای پرداخته شده و با روسازی­های رایج تک لایه­ای بررسی شده است. از اینرو یک لایه نازک از بتن معمولی و یا بتن مسلح به الیاف پلی پروپیلن به ضخامتی نسبی 30% ضخامت کل روسازی بر روی بتن غلتکی اجرا گردید. آزمایش‌های مقاومت فشاری و آزمون شکست در مود I بر روی نمونه ها پس از 28 روز عمل­آوری انجام گرفت. عمده نتایج حاکی از آن است که افزودن الیاف پلی­پروپیلن با مقدار مشخص شده تاثیر چندانی بر مقاومت­های فشاری و خمشی بتن در حالت تک لایه ندارد. همچنین اجرای بتن معمولی بر روی بتن غلتکی تاثیر منفی بر مقاومت خمشی و شکست نمونه­ها نسبت به حالت تک لایه ندارد. اما در نمونه­های تک لایه یا دولایه مسلح به الیاف ، بعلت پل زدگی الیاف پس از ایجاد اولین ترک موجب افزایش انرژی شکست نمونه­ها نسبت به نمونه­های غیر مسلح شده شده است که در ضخامت بیشتر الیاف این تغییر مشهود­تر بوده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Evaluation of mechanichal and fracture properties of single and two lifts concrete pavements

نویسندگان English

mohsen ahmadi 1
ghshafabakhsh ghshafabakhsh 2
abolfazl Hasasni 3
1 Ph.D Candidate of Transportation Engineering, Faculty of Civil Eng., Semnan University
2 Professor, Transportation Eng. Dept., Faculty of Civil Eng., Semnan University
3 Professor, Transportation Eng. Dept., Faculty of Civil Eng., Tarbiat Modares University
چکیده English

In order to expand the application of roller Compacted concrete (RCC) in high speed roads, casting a thin layer of concrete with high skid resistance immediately the after implementation and compaction of RCC has been suggested. In the present study, the mechanical and fracture properties of this kind of two lift concrete pavement (2LCP) evaluated and compared with common single lift concrete pavements. Therefore, a thin layer of plain concrete and polypropylene fiber reinforced concrete with relative thickness of 30% of total pavement thickness has been casted of RCC pavement.. Compressive strength and mode I fracture tests were performed on samples after 28 days curing.

Result showed that the addition of polypropylene fibers to plain concrete reduces the compressive strength of concrete slightly. Also, replacement of normal concrete or fiber reinforced concrete with roller concrete in the upper layer of 2LCP did not have a significant negative effect on flexural strength and fracture of the specimens compared to single lift RCC pavement with equivalent thickness.

کلیدواژه‌ها English

Roller compacted concrete
Two-lift concrete pavement
poly
Polypropylene fiber
Flexural strength
Fracture Energy
[1]. Mannaul 354. 2008 Guidance for Design and Implementation of Roller Concrete pavement of Road in Iran, Planning and Budget Organization (In Persian).
[2]. Composite Pavement Systems –HMA/PCC Composite Pavement. 2013 vol. 1 , Transportation Research Board (TRB),Washington, DC,
[3]. Rith M., KimY. K., HongS. J. &LeeS. W. 2017 Effect of horizontal loading on RCC-base composite pavement performance at heavy duty area, denitrification and phosphorus removal.Construction and Building Materials, 131, 741-745.
[4]. Tetsya S., Kim Y. K, Lee S. W., CHON B. J., Park J. Y., Han S. H. 2019 Early Age Behavior of Crack Movement in RCC base of HMA-RCC Composite Pavement, Proceedings of the 8th CECAR, Tokyo, 352
[5]. Composite Pavement Systems, Volume 2: PCC/PCC 2013 Composite Pavements. Washington, DC: The National Academies Press.
[6]. Ahmadi M., Hassani A., Soleimani M. R., Yusefi H. 2015 Performance of environmentally friendly fiber concrete in concrete pavement.,OmranModares Journal16 (1), 179-188.
[7]. Ghasemi M., Ghasemi M. R. 2019 Studying the fracture parameters and size effect of steel fiber-reinforced self-compacting concrete. Construction and Building Materials. 201, 447-460
[8]. Rooholamini H., Hassani A., Aliha M.R.M. 2018 Evaluating the effect of macro-synthetic fibre on the mechanical properties of roller compacted concrete pavement using response surface methodologyConstruction and Building Materials. 159, 517-529
[9]. FallahS., Nematzadeh M. 2017 Mechanical properties and durability of high-strength concrete containing macro-polymeric and polypropylene fibers with nano-silica and silica fume, Construction and Building Materials. 132 170–187.
[10]. Hesami S., Hikouei I. S., Emadi, S. A. A., 2016 Mechanical behavior of self-compacting concrete pavements incorporating recycled tire rubber crumb and reinforced with polypropylene fiber, Journal ofCleaner Production . 133, 228–234
[11]. Saidani M., Saraireh D., Gerges M. 2016 Behaviour of different types of fibre reinforced concrete without admixture, Engineering Structure. 113, 328-334
[12]. Roesler, J. R., A. Bordelon, C. Gaedicke, K. Park, and G. H. Paulino. 2006Fracture Behavior of Properties of Functionally Graded Fiber-Reinforced Concrete. Proc., Multiscale and Functionally Graded Materials Conference,KoOlina, Hawaii, American Institute of Physics, Melville,N.Y.,
[13]. Aliha M.R.M, Razmi A., Mousavi A. 2018 Fracture study of concrete composites with synthetic fibers additive under modes I and III using ENDB specimen, Constr. Build. Mater. 190, 612-622.
[14]. Rooholamini H., Hassani A., . Aliha M.R.M, 2018 Evaluating the effect of macro synthetic fibre on the mechanical properties of roller-compacted concrete pavement using response surface methodology, Constr. Build. Mater. 159 517–529.
[15]. Tabatabaeian M., Khaloo A., Joshaghani A., Hajibandeh E. Experimental investigation on effects of
hybrid fibers on rheological, mechanical, and durability properties of high-strength SCC, Constr. Build. 368
[16].Roesler, J., Paulino, G., Gaedicke, C., Bordelon, A., & Park, K. 2007. Fracture Behavior of Functionally Graded Concrete Materials for Rigid Pavements. Transportation Research Record, 2037(1), 40–49
[17]. Fang X., Jing Z., Shao-Qin R., Ming-Kai Z., Jian-Ping C., 2013 Mechanical Analysis of RCC-PCC Journal of Geotechnical Engineering, volume 18, 3351 -3363
[18]. Yoo D.Y., Banthia N. 2016 Mechanical properties of ultra-high -performance fiber-reinforced concrete: A review, Cement and Concrete Composites. 17, 267-280.
[19]. Ollivier J.P., Maso J.C., Bourdette B. 1995Interfacial transition zone in concrete. Advanced cement based materials ,2 ,30–8 .
[20]. Kunieda M., Ueda N., Nakamura H. 2014 Ability of recycling on fiber reinforced concrete, Constr. Build. Mater. 67 , 315–320
[21]. Signorini C., Sola A., Malchiodi B., Nobili A., Gatto A. 2020 Failure mechanism of silica coated polypropylene fibres for Fibre Reinforced Concrete (FRC) , Constr. Build. Mater. 236 (2020) .
[22]. Santos A.G., Rincón J.M., Romero M.,. Talero R, 2005 ,Characterization of a polypropylene fibered cement composite using ESEM, FESEM and mechanical testing, Constr. Build. Mater. 19 (5) ,396–403.
[24]- Qin Y., Zhang X., Chai J., Xu Z., Li Sh., 2019 Experimental study of compressive behavior of polypropylene-fiber reinforced and polypropylene-fiber-fabric-reinforced concrete, Constr. Build. Mater. 194 , 216-225.
[23] Castoldi R. d. S., . Souza L. M. S. d, Silva F. A., 2019, Comparative study on the mechanical behavior and durability of polypropylene and sisal fiber reinforced concretes, Constr. Build. Mater. 211 , 617 628.
[25]. Park K., Paulino G. H., Roesler J., 2010 Cohesive fracture model for functionally graded fiber reinforced concrete. Cement and Concrete Research, 40( 6), 956-965.
[26]. Brand, A. S., Amirkhanian, A. N., &Roesler, J. R. 2014 Flexural Capacity of Full-Depth and Two-Lift Concrete Slabs with Recycled Aggregates. Transportation Research Record, 2456(1), 64–72