ارزیابی مقاومت فشاری بتن با استفاده از روش های سرعت پالس اولتراسونیک و مقاومت الکتریکی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی ارشد سازه، دانشگاه ملایر

2 استادیار، دانشکده عمران و معماری، دانشگاه ملایر

10.22124/jcr.2022.22227.1573

چکیده

مقاومت فشاری بتن از مهم‌ترین خواص آن درنظرگرفته ‌می‌شود و معمولاً شمای کلی از کیفیت بتن را ارائه می‌دهد، زیرا به‌طور مستقیم به ریزساختار خمیر سیمان بستگی دارد. ارزیابی مقاومت فشاری بتن به روش‌های مخرب و غیرمخرب انجام می‌شود. روش‌های غیرمخرب، با تعداد آزمونه‌های به‌مراتب کمتر می‌توانند تخمین مناسبی از مقاومت فشاری بتن به‌دست دهند. در این تحقیق از روش‌های غیرمخرب اولتراسونیک و مقاومت الکتریکی برای تخمین مقاومت فشاری آزمونه‌های بتن معمولی با سه نسبت متفاوت آب به سیمان استفاده شد و مدل‌های ریاضی برای تخمین مقاومت فشاری توسط این روش‌ها ارائه و از لحاظ دقت با هم مقایسه شدند. از نرم‌افزار آماری SPSS برای تحلیل داده‌های آزمایش‌ها استفاده شد. مدل‌های ریاضی خطی و غیرخطی بیانگر رابطۀ‌ بین پارامترهای مقاومت الکتریکی، سرعت پالس اولتراسونیک و مقاومت فشاری برای هریک از نسبت‌های آب به سیمان به ‌وسیلۀ نرم‌افزار استخراج شدند. نتایج نشان داد ترکیب دو روش سرعت پالس اولتراسونیک و مقاومت الکتریکی برای تخمین مقاومت فشاری در مقایسه با تنها یک روش، از دقت بیشتری برخوردار می‌باشد. براساس نتایج حاصله، شکل اصلاح شدۀ تابع نمایی با محدوده ضریب تعیین 83/0-63/0 و میانگین قدرمطلق خطای نسبی 5/6-3/2 درصد و تابع چندجمله‌ای با محدوده ضریب تعیین 89/0-63/0 و میانگین قدرمطلق خطای نسبی 7-2/3 درصد دارای عملکرد بهتری نسبت به سایر مدل‌ها می‌باشند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of compressive strength of concrete using ultrasonic pulse velocity and electrical resistivity methods

نویسندگان [English]

  • Mostafa Ghareman 1
  • Alireza Azarioon 2
  • Gholamreza Ghahremani 2
1 M.Sc. student, Department of Civil and Architectural Engineering, Malayer University
2 Assistant Professor, Department of Civil and Architectural Engineering, Malayer University
چکیده [English]

Compressive strength of concrete is considered as one of its most important properties and usually gives an overview of the quality of concrete, because the strength depends directly on the microstructure of the cement paste. Evaluation of compressive strength of concrete is done by destructive and non-destructive methods. Non-destructive methods, with a much fewer number of tests, can provide a good estimate of the compressive strength of concrete. In this research, non-destructive ultrasonic pulse velocity and electrical resistivity methods were used to estimate the compressive strength of normal concrete tests with three different water-to-cement ratios, and mathematical models were proposed to estimate the compressive strength were compared. SPSS statistical software was used to analyze the test data. Different linear and nonlinear mathematical models related the relationship between the parameters of electrical resistivity, ultrasonic pulse velocity and compressive strength for each of the water-to-cement ratios as well as 28-day age were extracted by software to estimate the compressive strength. The results showed that the combination of ultrasonic pulse velocity and electrical resistivity methods for estimating compressive strength has a higher accuracy compared to one method alone. For this purpose, the modified form of the exponential function with a coefficient range of 0.63-0.83 and the mean absolute value of relative error 2.3-6.5% and the polynomial function with the range 0.63-0.89 and the mean absolute value of relative error is 3.2-7% had better performance.

کلیدواژه‌ها [English]

  • ultrasonic pulse velocity
  • electrical resistivity
  • non-destructive methods
  • regression
  • compressive strength

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