بررسی اثر الیاف ساقه برنج بر رفتار مکانیکی خاک‌های رسی تثبیت ‌شده با سیمان

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی عمران، دانشگاه صنعتی شاهرود، شاهرود، ایران

چکیده

تولید روزافزون پسماندهای لیگنوسلولزی و سوزاندن بخشی از آن‌ها توسط کشاورزان سبب نگرانی‌های زیست‌محیطی شده است. استفاده مجدد از این الیاف‌ها جهت بهسازی خاک‌های سست می‌تواند از این قبیل از مشکلات بکاهد. لازم به ذکر است استفاده از الیاف طبیعی به دلیل سازگاری با محیط زیست و نیز تحقق اهداف ژئوتکنیک پایدار بیش از پیش مورد توجه قرار گرفته است. در این تحقیق به ارزیابی اثر تسلیح الیاف طبیعی ساقه برنج بر رفتار مکانیکی خاک‌های ریزدانه رسی تثبیت ‌شده با سیمان پرداخته شده ‌است. مطالعه اثر درصد‌های مختلف اختلاط این الیاف بر‌ روی مقاومت فشاری خاک رسی تثبیت‌ شده با مقادیر مختلف سیمان با انجام آزمایش مقاومت فشاری محدود نشده و نیز بررسی اثر الیاف فوق و سیمان بر نتایج آزمایش تراکم استاندارد، اساس تحقیقات آزمایشگاهی این پروژه را تشکیل داده‌اند. در این مقاله سعی شده است تا با استفاده از سیمان به عنوان یک افزودنی در کنار الیاف ساقه برنج، چسبندگی مورد نیاز ایجاد شده تا مقاومت فشاری نمونه‌ها افزایش یابد. نتایج آزمایش مقاومت فشاری محدود نشده نمونه‌های عمل‌آوری نشده حاوی مقادیر وزنی مختلف الیاف (0/25% و 1%) و سیمان (4%، 8% و 12%) نشان داده ‌است که در یک مقدار ثابت سیمان، افزایش مقدار الیاف سبب افزایش مقاومت فشاری تا 148% و همچنین در مقدار الیاف یکسان، افزایش مقدار سیمان سبب افزایش مقاومت فشاری تا 183% شده‌ است.  

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the Effect of Natural Rice Straw Fibers on the Mechanical Behavior of Clayey Soils Stabilized with Cement

نویسندگان [English]

  • Mohsen Keramati
  • Fatemeh Sabbaqzade
  • Amin Ramesh
Faculty of Civil Engineering, Shahrood University of Technology, Shahrud, Iran
چکیده [English]

Increased production of lignocellulosic waste and its incineration by farmers have raised bio-environmental concerns. Reusing these fibers to change the mechanical properties of loose soil can reduce these problems. It should be noted that the use of natural fibers has received more attention due to their compatibility with the environment and the realization of sustainable geotechnical goals. The reinforcement effect of rice straw fibers on the mechanical behavior of clayey soils stabilized with cement has been investigated. Studying the effect of different percentages of mixing these fibers on the compressive strength of clayey soils stabilized with different amounts of cement through performing unconfined compressive strength test and evaluation of the effect of the so-called fibers on the results of standard compaction test form the basis of laboratory research in this project. Cement can be used as an additive along with fiber reinforcement to create the required cohesion to increase the compressive strength of the sample. The results of unconfined compressive strength on the uncured samples stabilized with different amounts of cement (4%, 8% and, 12%), and reinforced with different amounts of rice straw fibers (0.25% and, 1%) show that at a constant content of cement, increasing the fiber percentage can increase the compressive strength up to 148% and also, at a constant content of fibers, increasing the cement percentage can increase the compressive strength up to 183%.

کلیدواژه‌ها [English]

  • Clayey Soil
  • Unconfined Compressive Strength Test
  • Cement
  • Rice Straw Fibers
  • Curing
[1] H.M. Moghaddam, M. Keramati, A. Ramesh, R. Naderi, Experimental Evaluation of the Effects of Structural Parameters, Installation Methods and Soil Density on the Micropile Bearing Capacity, International Journal of Civil Engineering,  (2021) 1-13.
[2] N.C. Consoli, M.A. Vendruscolo, A. Fonini, F. Dalla Rosa, Fiber reinforcement effects on sand considering a wide cementation range, Geotextiles and Geomembranes, 27(3) (2009) 196-203.
[3] M. Ayeldeen, A. Negm, M. El-Sawwaf, M. Kitazume, Enhancing mechanical behaviors of collapsible soil using two biopolymers, Journal of Rock Mechanics and Geotechnical Engineering, 9(2) (2017) 329-339.
[4] K.Q. Tran, T. Satomi, H. Takahashi, Study on Effect of Cornsilk Fiber in Cemented Soil Stabilization, in:  Congrès International de Géotechnique–Ouvrages–Structures, Springer, 2017, pp. 571-579.
[5] M.A. Khodabandeh, S. Nokande, A. Besharatinezhad, B. Sadeghi, S.M. Hosseini, The effect of acidic and alkaline chemical solutions on the behavior of collapsible soils, Periodica Polytechnica Civil Engineering, 64(3) (2020) 939-950.
[6] M.S. Pakbaz, R. Alipour, Influence of cement addition on the geotechnical properties of an Iranian clay, Applied Clay Science, 67 (2012) 1-4.
[7] K.Q. Tran, T. Satomi, H. Takahashi, Tensile behaviors of natural fiber and cement reinforced soil subjected to direct tensile test, Journal of Building Engineering, 24 (2019) 100748.
[8] H.A. Chenarboni, S.H. Lajevardi, H. MolaAbasi, E. Zeighami, The effect of zeolite and cement stabilization on the mechanical behavior of expansive soils, Construction and Building Materials, 272 (2021) 121630.
[9] K.S. Wani, B. Mir, A comparative laboratory scale study on the effect of waste boulder crusher dust and cement in stabilising marginal sediments, Geomechanics and Geoengineering,  (2020) 1-12.
[10] M. Ayeldeen, M. Kitazume, Using fiber and liquid polymer to improve the behaviour of cement-stabilized soft clay, Geotextiles and Geomembranes, 45(6) (2017) 592-602.
[11] K.Q. Tran, T. Satomi, H. Takahashi, Study on strength behavior of cement stabilized sludge reinforced with waste cornsilk fiber, GEOMATE Journal, 13(39) (2017) 140-147.
[12] P. Donkor, E. Obonyo, Earthen construction materials: Assessing the feasibility of improving strength and deformability of compressed earth blocks using polypropylene fibers, Materials & Design, 83 (2015) 813-819.
[13] V. Afroughsabet, L. Biolzi, T. Ozbakkaloglu, High-performance fiber-reinforced concrete: a review, Journal of materials science, 51(14) (2016) 6517-6551.
[14] M.A. Dafalla, A.A.B. Moghal, A.K. Al-Obaid, Enhancing tensile strength in clays using polypropylene fibers, GEOMATE Journal, 12(29) (2017) 33-37.
[15] A.P. Balkis, The effects of waste marble dust and polypropylene fiber contents on mechanical properties of gypsum stabilized earthen, Construction and Building Materials, 134 (2017) 556-562.
[16] S. Bojnourdi, S.S. Narani, M. Abbaspour, T. Ebadi, S.M.M. Hosseini, Hydro-mechanical properties of unreinforced and fiber-reinforced used motor oil (UMO)-contaminated sand-bentonite mixtures, Engineering Geology, 279 (2020) 105886.
[17] K. Salimi, M. Ghazavi, Soil reinforcement and slope stabilisation using recycled waste plastic sheets, Geomechanics and Geoengineering, 16(6) (2021) 497-508.
[18] P. Zak, T. Ashour, A. Korjenic, S. Korjenic, W. Wu, The influence of natural reinforcement fibers, gypsum and cement on compressive strength of earth bricks materials, Construction and Building Materials, 106 (2016) 179-188.
[19] K.Q. Tran, T. Satomi, H. Takahashi, Improvement of mechanical behavior of cemented soil reinforced with waste cornsilk fibers, Construction and Building Materials, 178 (2018) 204-210.
[20] A. Diambra, E. Ibraim, D.M. Wood, A. Russell, Fibre reinforced sands: experiments and modelling, Geotextiles and geomembranes, 28(3) (2010) 238-250.
[21] A. Gholampour, T. Ozbakkaloglu, A review of natural fiber composites: Properties, modification and processing techniques, characterization, applications, Journal of Materials Science, 55(3) (2020) 829-892.
[22] F. Sabbaqzade, M. Keramati, H. Moradi Moghaddam, P. Hamidian, Evaluation of the mechanical behaviour of cement-stabilised collapsible soils treated with natural fibres, Geomechanics and Geoengineering,  (2021) 1-16.
[23] D. ASTM, Standard test methods for laboratory compaction characteristics of soil using standard effort, ASTM D698,  (2012).
[24] A. Standard, Test method for particle-size analysis of soils, ASTM international, West Conshohocken, PA, DOI: 10.1520/D4513, 11 (2007).
[25] A.C.D.-o. Soil, Rock, Standard test methods for specific gravity of soil solids by water pycnometer, ASTM international, 2006.
[26] A. Standard, Standard test methods for laboratory determination of water (moisture) content of soil and rock by mass, D2216-10). ASTM International, West Conshohocken, PA. doi, 10 (2010).
[27] A.C.D.-o. Soil, Rock, Standard test methods for liquid limit, plastic limit, and plasticity index of soils, ASTM international, 2010.
[28] S.D. Petroudy, Physical and mechanical properties of natural fibers, in:  Advanced high strength natural fibre composites in construction, Elsevier, 2017, pp. 59-83.
[29] D. Astm, 2166. Standard test method for unconfined compressive strength of cohesive soil, Annual Book of ASTM standards, ASTM International, West Conshohocken, PA, USA,  (2006).
[30] Z. Nazari, A. Tabarsa, N. Latifi, Effect of compaction delay on the strength and consolidation properties of cement-stabilized subgrade soil, Transportation Geotechnics, 27 (2021) 100495.