Crack Propagation and Material Characteristics of Rocklike Specimens Subject to Different Loading Rates

Pengxiang Zhao, Shugang Li, Chun-Hsing Ho, Haifei Lin, Risheng Zhuo

Research output: Contribution to journalArticle

Abstract

This paper evaluates the cracking mechanism and material characteristics of rocklike specimens under five loading rates (0.02, 0.06, 0.10, 0.14, and 0.18 mm/s). The rocklike cylinder specimens were prepared and mixed using river sand (as aggregate sources) and cement, gypsum, and starch (as binders). Uniaxial compression tests associate with binarization imaging processing were carried out using the five loading rates to evaluate the cracking propagations and characteristics of rocklike specimens. The results show that with the increase in the loading rate, the peak tensile and compressive strengths of the rocklike specimen increases. The relationship between the ratio of stress to peak stress, and the five loading rates of the rocklike specimen can be expressed as a natural logarithm model while the relationship between the initial crack length of the rocklike specimen and the five loading rates can be represented by as an exponential function. The average rate of crack propagations increases exponentially as the loading rate increases. Based on all test and analysis results and, the paper concludes that the characteristics of cracking mechanism, propagations, and characteristics of rocklike materials show the similar mechanical behaviors as compared with other rock specimens.

Original languageEnglish (US)
Article number04019113
JournalJournal of Materials in Civil Engineering
Volume31
Issue number7
DOIs
StatePublished - Jul 1 2019

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Crack propagation
Calcium Sulfate
Exponential functions
Gypsum
Starch
Compressive strength
Binders
Cements
Compaction
Tensile strength
Sand
Rivers
Rocks
Cracks
Imaging techniques
Processing

Keywords

  • Crack propagation
  • Fracture angle
  • Initial crack
  • Loading rate
  • Uniaxial compression

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials

Cite this

Crack Propagation and Material Characteristics of Rocklike Specimens Subject to Different Loading Rates. / Zhao, Pengxiang; Li, Shugang; Ho, Chun-Hsing; Lin, Haifei; Zhuo, Risheng.

In: Journal of Materials in Civil Engineering, Vol. 31, No. 7, 04019113, 01.07.2019.

Research output: Contribution to journalArticle

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