JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2016, Vol. 33 ›› Issue (3): 147-150.DOI: 10.11988/ckyyb.20141060

• HYDRAULIC STRUCTURE AND MATERIAL • Previous Articles    

Experimental Study on the Relative Elastic Deformation of Plastic Concrete with Low Strength

SONG Li1, LIU Lu-lu2, GAO Yu-qin1   

  1. 1.Yellow River Institute of Hydraulic Research, Yellow River Conservancy Commission of the Ministry of Water Resources, Zhengzhou 450003, China;
    2.School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
  • Received:2014-12-23 Online:2016-03-01 Published:2016-03-09

Abstract: In order to determine two endpoints (P1 and P2) in the straight-line segment of stress-strain curve of plastic concrete, and to obtain the elastic modulus, we carried out uniaxial compression test on 48 concrete specimens of four different mix proportions. Through analyzing typical stress-strain curve, we selected approximated straight-line in the curve, and compared the secant modulus with mean value of tangent modulus. On this basis, we studied how to determine P1 and P2. The results show that 1) the approximated straight-line segment appears at the ascent stage in the stress-strain curve of plastic concrete; 2) with given strength of plastic concrete less than 5 MPa, it is suitable to choose 60% and 80% of peak stress as the elastic modulus of P1 and P2, respectively, otherwise, further study is required. Finally, the research offers a method for determining the values of material performance of plastic concrete with low strength.

Key words: plastic concrete, stress-strain curve, secant modulus, tangent modulus, position of P1 and P2 in stress-strain curve

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