The Effect of Initial Temperature of Self-Compacting Concrete on Its Long-Term Mechanical Properties

نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 گروه مهندسی عمران- سازه، دانشکده مهندسی، دانشگاه زنجان

2 پژوهشگاه استاندارد، پژوهشکده فناوری و مهندسی، گروه پژوهشی ساختمانی و معدنی، کرج

3 مهندسی عمران سازه، دانشکده مهندسی، دانشگاه زنجان

4 گروه مهندسی عمران، دانشگاه جامع علمی کاربردی شهرداری های خراسان رضوی

چکیده

یکی از مسائل مهم در تولید بتن، تنوع محیطی است که بر بتن و عناصر ساخته شده از این ماده تأثیر می گذارد. با توجه به اهمیت ویژگی‌های مختلف بتن در شرایط کوتاه‌مدت و بلندمدت، این مقاله با هدف بررسی تأثیر شرایط دمایی اولیه بتن خود تراکم بر ویژگی‌های بلندمدت آن و تعیین دمای بهینه اولیه بتن می‌باشد. برای این منظور، آزمایش های متعددی در سه شرایط دمایی 5، 20 و 40 درجه سانتیگراد برای ارزیابی رئولوژی و خواص مکانیکی بتن تازه در محدوده 7 و 28 روز انجام شد. در این آزمایش‌ها، از مخلوط‌های معدنی جایگزین سیمان مانند میکرو سیلیس، خاکستر بادی و زئولیت برای ساخت نمونه‌های بتنی استفاده شد. نتایج نشان می‌دهد که خواص مکانیکی نمونه‌ها با افزایش دمای اولیه در کوتاه‌مدت افزایش می‌یابد، در حالی که چنین خواصی در طولانی‌مدت در مقایسه با نمونه‌های ساخته‌شده در دمای اولیه پایین‌تر کاهش می‌یابد. علاوه بر این، سیالیت بتن خود تراکم با افزایش دمای اولیه افزایش می یابد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Effect of Initial Temperature of Self-Compacting Concrete on Its Long-Term Mechanical Properties

نویسندگان [English]

  • Mahyar Mostashiri 1
  • Behzad Saeedi Razavi 2
  • Jamal Ahmadi 1
  • Hamid Reza Amini 3
  • Ali Goharrokhi 4
1 Department of Civil Engineering, Zanjan University, Zanjan, Iran
2 Research Assistant professor, Standard Research Institute, Technical and engineering faculty, Construction and mineral Department, Karaj, Iran
3 Department of Civil Engineering, Zanjan University, Zanjan, Iran
4 Director of Civil Engineering Department, Applied Science Center of Khorasan Razavi Municipalities, Mashhad, Iran
چکیده [English]

One of the important issues in the production of concrete is environmental variability that affects the concrete and elements constructed from this material. Due to the importance of different characteristics of concrete in short- and long-term conditions, this article aims to investigate the influence of initial temperature conditions of self-compacting concrete on its long-term characteristics and determine the initial optimal temperature of concrete. For these purposes, several experiments under three temperature conditions of 5, 20, and 40 degree-of-Celsius were conducted to evaluate the rheology and mechanical properties of fresh concrete in the range of 7 and 28 days. In these experiments, alternative mineral admixtures of cement such as micro-silica, fly ash, and zeolite were used to build the concrete specimens. Results demonstrate that the mechanical properties of the specimens increase with increasing initial temperature in the short term, while such properties significantly decrease in the long term compared to the specimens constructed under lower initial temperature. Moreover, the fluidity of self-compacting concrete increases with increasing initial temperature.

کلیدواژه‌ها [English]

  • Self-compacting concrete
  • Initial concrete temperature
  • Mechanical strength
  • Durability properties
  • Rheology
  • Optimal temperature
Abed M, de Brito J, “Evaluation of high-performance self-compacting concrete using alternative materials and exposed to elevated temperatures by non-destructive testing”, Journal of Building Engineering, 2020, 32, 101720.
ACI 237R-07, Self-Consolidating Concrete, American Concrete Institute: Farmington Hills, US, 2007.
ACI 306R-16, American Concrete Institute, Farmington Hills, US, 2017.
Andiç-Çakır Ö, Hızal S, “Influence of elevated temperatures on the mechanical properties and microstructure of self consolidating lightweight aggregate concrete”, Construction and building materials, 2012, 34, 575-583. Doi: 10.1016/j.conbuildmat.2012.02.088.
ASTM C1611/C1611M-14: Standard Test Method for Slump Flow of Self-Consolidating Concrete. ASTM International, West Conshohocken, PA, US, 2014.
Aydin A C, Öz A, Polat R, Mindivan H, “Effects of the different atmospheric steam curing processes on the properties of self-compacting-concrete containing micro silica”, Sadhana, 2015, 40 (4), 1361-1371. Doi: 10.1007/s12046-015-0338-x.
Bastami M, Chaboki-Khiabani A, Baghbadrani M, Kordi M, “Performance of high strength concretes at elevated temperatures”, Scientia Iranica, 2011, 18 (5), 1028-1036. Doi: 10.1016/j.scient.2011.09.001.
Bu Y, Hou X, Wang C, Du J, “Effect of colloidal nanosilica on early-age compressive strength of oil well cement stone at low temperature”, Construction and Building Materials, 2018, 171, 690-696. Doi: 10.1016/j.conbuildmat.2018.03.220.
Efnarc S, “Guidelines for self-compacting concrete, european federation for specialist construction chemicals and concrete systems”, Norfolk, UK. English ed., February, 2002.
Koehler EP, Fowler DW, ICAR mixture proportioning procedure for self-consolidating concrete, 2007.
Mathews ME, Kiran T, Naidu VCH, Jeyakumar G, Anand N, “Effect of high-temperature on the mechanical and durability behaviour of concrete”, Materials Today: Proceedings, 2020, 42, 718-725.
Mohan A, Mini KM, “Strength and durability studies of SCC incorporating silica fume and ultra-fine GGBS”, Construction and Building Materials, 2018. 171, 919-928. Doi: 10.1016/j.conbuildmat.2018.03.186.
Morsy MS, Al-Salloum YA, Abbas H, Alsayed SH, “Behavior of blended cement mortars containing nano-metakaolin at elevated temperatures”, Construction and Building materials, 2012, 35, 900-905. Doi: 10.1016/j.conbuildmat.2012.04.099.
Othuman MA, Wang Y, “Elevated-temperature thermal properties of lightweight foamed concrete”, Construction and Building Materials, 2011, 25 (2), 705-716. Doi: 10.1016/j.conbuildmat.2010.07.016.
Phan LT, Carino NJ, “Effects of test conditions and mixture proportions on behavior of high-strength concrete exposed to high temperatures”, ACI Materials Journal, 2002, 99, 54-66. Doi: 10.14359/11317.
Prem PR, Bharatkumar B, Iyer NR, “Influence of curing regimes on compressive strength of ultra-high performance concrete”, Sadhana, 2013, 38 (6), 1421-1431.
Saleh Ahari R, Erdem TK, Ramyar K, “Permeability properties of self-consolidating concrete containing various supplementary cementitious materials”, Construction and Building Materials, 79, 326-336. Doi: 10.1016/j.conbuildmat.2015.01.053.
Schindler AK, Frank McCullough B, “Importance of concrete temperature control during concrete pavement construction in hot weather conditions”, Transportation Research Record, 2002, 1813 (1), 3-10. Doi: 10.3141/1813-01.
Siddique R, Kaur D, “Properties of concrete containing ground granulated blast furnace slag (GGBFS) at elevated temperatures”, Journal of Advanced Research, 3 (1), 45-51. DOI: 10.1016/j.jare.2011.03.004.
Tanyildizi H, Coskun A, “The effect of high temperature on compressive strength and splitting tensile strength of structural lightweight concrete containing fly ash”, Construction and building materials, 2008, 22 (11), 2269-2275. DOI: 10.1016/j.conbuildmat.2007.07.033.
Turanli L, Uzal B, Bektas F, “Effect of large amounts of natural pozzolan addition on properties of blended cements”, Cement and Concrete Research, 2005, 35 (6), 1106-1111. DOI: 10.1016/j.cemconres.2004.07.022.