Verifying Cement Compressive Strength Test Result Using the Most Effective Parameters

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی شیمی، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

2 گروه زمین شناسی، دانشکده علوم، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

This study was conducted to analyze factors influencing the compressive strength test. The purpose was to introduce various factors affecting the accuracy of the compressive strength test in accordance with current standards and evaluate the effect of some effective parameters such as equipment, mortar preparation, sample preparation, loading rate and etc.
To check the Reproducibility of the compressive strength test a program was developed to assess the possible modes through changes in loading rate matrix, standard sand, sample preparation, and tester. The changes of each parameter were measured within 2, 7 and 28-day interval, while other conditions were considered as constant based on the EN196-1 and ISIRI 393 standards.
According to the test results, the most important factors in creating the difference in results are the type of the sand and loading rate. The changes in the Reproducibility percentage using different sands with softer grains increases the coefficient of variation and reduced performance of the test. Also in some cases, with increasing the loading rate up to 40%, the compressive strength of 28 days is increased by 13%.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Verifying Cement Compressive Strength Test Result Using the Most Effective Parameters

نویسندگان [English]

  • Mohammad Baharyeh 1
  • Maasoomeh Khalily 2
  • Behnam Nasrollahzadeh 1
1 Department of chemical engineering, Faculty of engineering, Ferdowsi University of Mashhad, Mashhad, Iran
2 Department of Geology, Faculty of science, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

This study was conducted to analyze factors influencing the compressive strength test. The purpose was to introduce various factors affecting the accuracy of the compressive strength test in accordance with current standards and evaluate the effect of some effective parameters such as equipment, mortar preparation, sample preparation, loading rate and etc.
To check the Reproducibility of the compressive strength test a program was developed to assess the possible modes through changes in loading rate matrix, standard sand, sample preparation, and tester. The changes of each parameter were measured within 2, 7 and 28-day interval, while other conditions were considered as constant based on the EN196-1 and ISIRI 393 standards.
According to the test results, the most important factors in creating the difference in results are the type of the sand and loading rate. The changes in the Reproducibility percentage using different sands with softer grains increases the coefficient of variation and reduced performance of the test. Also in some cases, with increasing the loading rate up to 40%, the compressive strength of 28 days is increased by 13%.

کلیدواژه‌ها [English]

  • Cement compressive strength
  • Reproducibility
  • loading rate

مراجع

Aggoun, S., Cheikh, Z.M., Chikh, N., 2008. Effect of some admixtures on the setting time and strength evolution of cement pastes at early ages, Construction and Building Materials, Vol. 22(2), 106−110.
Bekaeian, M., 1997. Iran's national standard, mechanical testing methods of compressive and flexural strength of cement paste mortar, Code No. 393.
Caldarone, M. A., 2008. High-Strength Concrete: A Practical Guide, Routledge, London, pp. 34-35.
Del Viso, J. R., Carmona, J. R., Ruiz, G., 2008. Shape and size effects on the compressive strength of high-strength concrete, Cement and Concrete Research, Vol. 38(3), 386–395.
Dilghani, S., 2001. Concrete Technology, Tabriz University, Fourth Edition.
EUROPEAN STANDARD, EN 196-1, 2018. Methods of testing cement.
Handbook of refractory materials and building materials engineering, Industrial Force Training Centre, Abyek Cement Complex.
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ISIRI 393, 2009.  Cement – Determination of flexural and compressive strengths- Test method.
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Reddy, B. V. V., Gupta, A., 2008. Influence of sand grading on the characteristics of mortars and soil–cement block masonry, Construction and Building Materials, Vol. 22 (8),p.1614-1623.
Riding, K., Silva, D.A., Scrivener, K., 2010. Early age strength enhancement of blended cement systems by CaCl2 and diethanol-isopropanolamine, Cement and Concrete Research, Vol. 40(2), 935−946.
Taeb, A., Kouhi, F., 1994. Cement, Cement Research Center Publications, University of Science and Technology, Tehran, Iran.
Torreti, J.M., Benaija, E.H., Boulay, C., 2002. Influence of boundary conditions on strain softening in concrete compression tests, Journal of Engineering Mechanics, Vol. 119(12), 2369–2384
نشریه انجمن زمین شناسی مهندسی ایران
دوره 11، شماره 3
آذر 1397
صفحه 75-83

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سابقه مقاله

  • تاریخ دریافت: 25 آذر 1397
  • تاریخ بازنگری: 27 اسفند 1397
  • تاریخ پذیرش: 19 فروردین 1398

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