مهندسی سازه و ساخت

مهندسی سازه و ساخت

تاثیر سیکل‌های دمایی کوتاه و بلند مدت بر حجم نفوذ آب و لایه سطحی بتن با استفاده از آزمون‌های نوین محفظه استوانه‌ای و انتقال اصطکاک

نوع مقاله : علمی - پژوهشی

نویسندگان
1 استاد، دانشکده فنی و مهندسی، دانشگاه بین المللی امام خمینی (ره)، قزوین، ایران
2 دکترای سازه، مدیر گروه پژوهشی پژوهشکده سوانح طبیعی، تهران، ایران.
3 دانشجوی دکترا، دانشکده فنی و مهندسی، دانشگاه بین‌المللی امام خمینی (ره)، قزوین، ایران
چکیده
نفوذ آب به داخل بتن می‌تواند باعث کاهش دوام و پایایی بتن گردد. مخصوصاً افزایش و کاهش دما به‌صورت پی‌درپی سبب تغییرات منفی بر مشخصات فیزیکی و شیمیایی بتن شده و همین موضوع می‌تواند باعث کاهش کارکرد بتن در برابر نفوذ آب گردد. لذا نیاز می-باشد که تاثیرات سیکل‌های دمایی بر مقاومت سطحی بتن و مقدار حجم نفوذ و عمق نفوذ آب به بتن مورد بررسی قرار گیرد. همچنین با توجه به اینکه طبق استانداردهای بین‌المللی، برای اندازه‌گیری نفوذپذیری بتن باید آزمونه‌ی بتنی شکسته شود، لذا نیاز به آزمون جدیدی است که بدون شکست آزمونه، حجم نفوذ آب به بتن اندازه‌گیری شود. قبل از شروع آزمایش؛ نخست آزمونه‌های بتنی در گرم‌کن برای مدت و دمای مشخص قرار گرفته و سپس از گرم‌کن خارج و در دمای محیط برای 16 ساعت نگهداری شده‌اند. به ‌این ‌ترتیب یک سیکل دمایی کامل ‌گردید. با تکمیل شدن تعداد سیکل‌های مورد نظر، آزمونه‌ها از این روند خارج و تحت آزمایش-های نفوذپذیری و انتقال اصطکاک قرار گرفته و در نهایت آزمونه بتنی توسط جک فشاری به دو قسمت تقسیم شده و سطح خیس شده آن برای دریافت عمق نفوذ، اندازه‌‌گیری شد. طبق نتایج حاصله، با مقایسه حجم نفوذ آب به بتن در آزمونه‌های عادی با آزمونه‌های قرارگرفته در سیکل‌های مختلف دمایی مشاهده می‌شود که سیکل‌های 20، 40، 140 و 160 چرخه به ترتیب باعث افزایش حجم نفوذ آب به بتن به مقدار 2/2، 3/4، 9/14 و 8/16برابر شده است. در ضمن با اعمال سیکل‌های فوق مقاومت حاصل از آزمون انتقال اصطکاک در سن ۱۲۰ روزه، به ترتیب باعث کاهش 4/2، 6، 65 و 79 درصدی نسبت به بتن عادی گردیده است. همچنین با توجه به ضرایب همبستگی به‌دست ‌آمده، می‌توان با استفاده از آزمون محفظه استوانه‌ای و انتقال اصطکاک، عمق نفوذ آب و مقاومت فشاری بتن را با معادلات ارائه‌شده و بادقت بالایی اندازه‌گیری نمود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

The effect of short and long-term temperature cycles on the volume of water penetration and the surface layer of concrete using modern tests of cylindrical chamber and friction transfer

نویسندگان English

Mahmood Naderi 1
Ali Saberi Vaezaneh 2
Sardar Wali Din 3
1 Professor, Civil Engineering Faculty. Imam Khomeini International University. Qazvin. Iran
2 Ph.D. Structural, Head of Research Group of Natural Disaster Research Institute,, Tehran. Iran.
3 P.h.D. Student, Civil Engineering Faculty, Imam Khomeini International University, Qazvin, Iran
چکیده English

The penetration of water into concrete can reduce the durability and reliability of concrete. Especially, successive increase and decrease in temperature causes negative changes on the physical and chemical characteristics of concrete, and this issue can reduce the performance of concrete against water penetration. Therefore, it is necessary to investigate the effects of temperature cycles on the surface resistance of concrete and the amount of penetration volume and depth of water penetration into concrete. Also, considering that according to international standards, to measure the permeability of concrete, a concrete sample must be broken, so a new test is needed to measure the volume of water penetration into concrete without breaking the sample. Before starting the test; First, the concrete samples were placed in the oven for a certain time and temperature, and then they were taken out of the oven and kept at room temperature for 16 hours. In this method, a cycle of temperature changes is completed. With the completion of the desired number of cycles, the samples are removed from this process and subjected to permeability and friction transfer tests, and finally, the sample is divided in two half by a compression jack and its wetted surface is measured to obtain the depth of penetration. has been According to the results, by comparing the volume of water infiltration into concrete in normal samples with the samples placed in different temperature cycles, it is observed that the cycles of 20, 40, 140 and 160 respectively increase the volume of water infiltration. It has been increased to concrete by 2.2, 4.3, 14.9 and 16.8. . In addition, by applying the above cycles, the strength obtained from the friction transfer test at the age of 120 days has decreased by 2.4, 6, 65, and 79 percent, respectively, compared to normal concrete.

کلیدواژه‌ها English

Permeability"
Concrete"
Temperature "
In situ test"
"
Penetration Depth"
[1] Guo, Z., & Shi, X. (2011). Experiment and calculation of reinforced concrete at elevated temperatures. Elsevier.
[2] Shah, S. N. R., Akashah, F. W., & Shafigh, P. (2019). Performance of high strength concrete subjected to elevated temperatures: a review. Fire Technology, 55, 1571-1597.
[3] Ye, Z., Guo, G., Su, L., & Jiang, Y. (2021, July). Experimental study on mechanical properties of concrete under sub-high temperature cycles. In Journal of Physics: Conference Series (Vol. 1978, No. 1, p. 012007). IOP Publishing.
[4] Zeng, Q. (2018). Experiment  and  analysis  of  concrete  after  thermal  cycles. Guangzhou South China Univeristy of Technology.
[5] Sajid, H. U., & Kiran, R. (2019). Post-fire mechanical behavior of ASTM A572 steels subjected to high stress triaxialities. Engineering Structures, 191, 323-342.
[6] Zhang, Y., Chen, Q., Ju, J. W., & Bauchy, M. (2021). Effects of high temperature on the mechanical behavior of calcium silicate hydrate under uniaxial tension and compression. International Journal of Damage Mechanics, 30(7), 987-1011.
[7] Khan, M. S., Almutairi, S., & Abbas, H. (2022). Mechanical properties of concrete subjected to cyclic thermal loading. European Journal of Environmental and Civil Engineering, 26(7), 2855-2868.
[8] Shokrieh, M. M., Heidari-Rarani, M., Shakouri, M., & Kashizadeh, E. (2011). Effects of thermal cycles on mechanical properties of an optimized polymer concrete. Construction and Building Materials, 25(8), 3540-3549.
[9] Pachideh, G., & Gholhaki, M. (2020). Assessment of post-heat behavior of cement mortar incorporating silica fume and granulated blast-furnace slag. Journal of Structural Fire Engineering.
[10] Pachideh, G., Gholhaki, M., & Moshtagh, A. (2020). Performance of concrete containing recycled springs in post-fire conditions. Proceedings of the Institution of Civil Engineers-Structures and Buildings, 173(1), 3-16.
[11] Pachideh, G., & Gholhaki, M. (2021). An experimental investigation into effect of temperature rise on mechanical and visual characteristics of concrete containing recycled metal spring. Structural Concrete, 22(1), 550-565.
[12] Li, X. Xu, Q. & Chen, S. (2016); an experimental and numerical study on water permeability of concrete. Construction and building materials, 105, 503-510.
[13] Chang, Y. F., Chen, Y. H., Sheu, M. S., & Yao, G. C. (2006). Residual stress–strain relationship for concrete after exposure to high temperatures. Cement and concrete research, 36(10), 1999-2005.
[14] Kaboudan, A., & Keshtkar, M. (2020). Studying the permeability and strength of concretes containing silica fume, zeolite and fly ash using “Cylindrical chamber” method and British standard. Journal of Structural and Construction Engineering, 7(3), 92-113.
[15] She, A. M., Shui, Z. H., & Wang, S. H. (2008). Study on interfacial transition zone of concrete in dry climate and wide temperature change. Journal of Building Materials, 11, 485-488.
[16] Kou, S. C., Poon, C. S., & Etxeberria, M. (2014). Residue strength, water absorption and pore size distributions of recycled aggregate concrete after exposure to elevated temperatures. Cement and Concrete Composites, 53, 73-82.
[17] Amadi, I. G., & Amadi-Oparaeli, K. I. (2018). Effect of admixtures on strength and permeability of concrete. The International Journal of Engineering and Science, 7(7), 1-7.
[18] Sakai, Y. Yokoyama, Y., & Kishi, T. (2017). Relationship among the permeation rate of water into concrete, the mix design, curing, and the degree of drying. Journal of Advanced Concrete Technology, 15(10), 595-602.
[19] Liu, H., Luo, G., Wei, H., & Yu, H. (2018). Strength, permeability, and freeze-thaw durability of pervious concrete with different aggregate sizes, porosities, and water-binder ratios. Applied Sciences, 8(8), 1217.
[20] Dashtibadfarid, M., & Afrasiabi, M. (2017). Low-permeability concrete: Water-to-cement ratio optimization for designing drinking water reservoirs. Int. J. Innov. Eng. Sci, 2, 20-24.
[21] N‌a‌d‌e‌r‌i, M., M‌a‌l‌e‌k‌i, B., & F A‌m‌i‌n‌i, A. (2017). A‌S‌S‌E‌S‌S‌I‌N‌G T‌H‌E P‌E‌R‌M‌E‌A‌B‌I‌L‌I‌T‌Y O‌F T‌H‌E O‌I‌L A‌N‌D I‌T‌S C‌O‌M‌P‌O‌N‌E‌N‌T‌S I‌N‌T‌O P‌O‌R‌O‌U‌S C‌O‌N‌C‌R‌E‌T‌E U‌S‌I‌N‌G N‌E‌W C‌Y‌L‌I‌N‌D‌R‌I‌C‌A‌L C‌H‌A‌M‌B‌E‌R M‌E‌T‌H‌O‌D. Sharif Journal of Civil Engineering, 33(1.1), 89-93.
[22] DIN 1048 part 5: (1991). Test methods for concrete, Deutsches Institut für Normung, Germany.
[23] BSI (British Standards Institution). (2019). Testing Hardened Concrete. Depth of Penetration of Water under Pressure. British Standards Institution, BS EN 12390–8.
[24] ISO. (2021). Concrete hardened. Determination of the depth of penetration of water under pressure,. International Organization for Standardization.
[25] Khatri, R. P., & Sirivivatnanon, V. (1997). Methods for the determination of water permeability of concrete. Materials Journal, 94(3), 257-261.
[26] Yoo, J. H., Lee, H. S., & Ismail, M. A. (2011). An analytical study on the water penetration and diffusion into concrete under water pressure. Construction and Building Materials, 25(1), 99-108.
[27] Murata, J., Ogihara, Y., Koshikawa, S., & Itoh, Y. (2004). Study on watertightness of concrete. Materials Journal, 101(2), 107-116.
[28] Jin, Z. Q., Zhao, T. J., Gao, S., & Hou, B. R. (2013). Chloride ion penetration into concrete under hydraulic pressure. Journal of Central South University, 20(12), 3723-3728.
[29] ASTM C805/C805M-18. (ASTM 2018);  Standard Test Method for Rebound Number of Hardened Concrete, ASTM International, West Conshohocken, PA.
[30] ACI COMMITTEE 214 (2003). Guide for Obtaining Cores and Interpreting Compressive Strength Results, . American Concrete Institute.
[31] ASTM C900-19. (ASTM 2019); Standard Test Method for Pullout Strength of Hardened Concrete, ASTM International, West Conshohocken, PA.
[32] Masi, A., Santarsiero, G., & Digrisolo, A. (2013). Experimental evaluation of drilling damage on the strength of cores extracted from RC buildings. In Proc. of the International Conference on Earthquake and Structural Engineering (ICESE 2013).
[33] Naderi, M. (2005). Friction-transfer test for the assessment of in situ strength and adhesion of cementitious materials. Construction and Building Materials, 19(6), 454-459.
[34] Naderi، M. (2010); ‘Determination of concrete، stone، mortar، brick and other construction materials permeability with cylindrical chamber method’، Registration of patent in Companies and industrial property Office، Reg. N. 67726، Iran.
[35] Kaboudan, A., Naderi, M., & Afshar, M. A. (2021). The efficiency of Darcy and two-dimensional diffusion flow models to estimate water penetration into concrete. Journal of Building Engineering, 34, 102012.
[36] Naderi, M., & Kaboudan, A. (2021). Experimental study of the effect of aggregate type on concrete strength and permeability. Journal of Building Engineering, 37, 101928.
[37] Saberi Varzaneh, A., & Naderi, M. (2021). Study of bond strength between polymer-modified mortars/concrete and their mechanical properties using “friction-transfer” and “pull-off” methods. Mechanics Of Advanced Composite Structures, 8(1), 171-184.
[38] Naderi, M., & Ghodousian, O. (2012). Adhesion of self-compacting overlays applied to different concrete substrates and its prediction by fuzzy logic. The Journal of Adhesion, 88(10), 848-865.
[39] Varzaneh, A. S., & Naderi, M. (2021). Determination of shrinkage, tensile and compressive strength of repair mortars and their adhesion on the concrete substrate using" twist-off" and" pull-off" methods. Iranian Journal of Science and Technology, Transactions of Civil Engineering, 45, 2377-2395.
[40] Varzaneh, A. S., & Naderi, M. (2020). Numerical and experimental study of semi-destructive tests to evaluate the compressive and flexural strength of polymer-modified mortars and their adhesion to the concrete substrate. Revista Romana de Materiale, 50(4), 537-544.
[41] Naderi, M., Kaboudan, A., & Akhavan Sadighi, A. (2018). Comparative study on water permeability of concrete using cylindrical chamber method and British standard and its relation with compressive strength. Journal of Rehabilitation in Civil Engineering, 6(1), 116-131.
[42] KABOUDAN., A. (2020). Experimental and theoretical study of the effect of concrete constituent materials on the permeability of hardened concrete using “Cylindrical chamber” method. . Ph.D. Student. , Imam Khomeini International University.
[43] ASTM C136. (2015). Standard test method for relative density (specific gravity) and absorption of coarse aggregate. ASTM West Conshohocken, PA.
[44] ASTM, C127. (2015). Standard test method for relative density (specific gravity) and absorption of coarse aggregate. ASTM West Conshohocken, PA.
[45] ASTM, C128. (2015). Standard Test Method for Density, Relative density (Specific gravity) and Absorption of Fine Aggregates. Annual Book of ASTM Standards.
[46] TERIQET., A. (2019). Thermodynamic investigation of hydration and chemical shrinkage of cement containing slag. . Sharif. J. of Civil Eng, , 34(4.2) 82-57.
[47] ASTM C1679 .(2021). Standard Practice for Measuring Hydration Kinetics of Hydraulic Cementitious Mixtures Using Isothermal Calorimetry.
[48] B. VIDYA. (2019). Effect of Thermal Cycles On Concrete: An Overview, . International Journal for Research in Engineering Application & Management., 2454-9150.
دوره 11، شماره 2 - شماره پیاپی 79
اردیبهشت 1403
صفحه 186-203

  • تاریخ دریافت 03 اردیبهشت 1402
  • تاریخ بازنگری 13 تیر 1402
  • تاریخ پذیرش 24 تیر 1402