Using Limpet pull-off test for concrete strength prediction has nowbeen accepted in standards of the UK, North America, Holland and some othercountries. For its application in China, pull-off tests were carried out by usingthe Limpet in this study. Concrete specimens with four different mixtures andstrength classes were cast, representing the normal and the high performanceconcretes commonly used in China. After different ages, the pull-off tensilestrength was determined by using the Limpet and the compressive strength wasobtained by carrying out cube crushing test using a WE-100 universal testingmachine. To reflect the correlation between the pull-off tensile strength and thecube compressive strength, two types of curve were used for regression, y = axband y = aebx respectively. The regression efficiency of the two curves wascompared.
Bibliographical noteReference text: Bai, Y., Basheer, P.A.M., Cleland, D.J. and Long, A.E. (2009) ‘State-of-the-art applications of the
pull-off test in civil engineering’, Int. J. Structural Engineering, Vol. 1, No. 1, pp.93–103.
British Standards Institution (1986) Guide to the Use of Non-destructive Methods of Test for
Hardened Concrete, BS 1881 Part 201.
British Standards Institution (1992) Recommendations for the Assessment of Concrete Strength by
Near-to-surface Tests, BS 1881 Part 207.
British Standards Institution (1999) Products and Systems for the Protection and Repair of
Concrete Structures – Test Methods – Measurement of Bond Strength by Pull-off, BS EN
Gawn, C.J. (1978) A New Non-destructive Method for ‘In-situ’ Testing of Structural Concrete
Members, Final Year Honours Project, QUB.
Glass, C. (1981) Comparison of Different Partially Destructive Methods for Testing Concrete,
Final Year Honours Project, QUB.
Johnston, C.D. (1967) Concrete and its Constituent Materials in Uniaxial Tension and
Compression, PhD Thesis, QUB.
Long, A.E. (1979) Improvements in or Relating to Strength Testing Brittle Materials, British
Standard Patent No. 1549842.
Long, A.E. and Murray, A.M. (1981) ‘Pull-off test for in situ concrete strength’, Concrete,
December, Vol. 15, No. 12, pp.23–24, London.
Maxwell, C.T. (1977) A New Method of Non-destructively Testing Ordinary Portland Cement
Concrete, Final Year Honour Project, QUB.
- pull-off tensile strength
- compressive strength
- structural engineering.