The Pull-Out Method For On-Site Estimation of the Elastic Modulus of Concrete

Abstract

The paper describes a new experimental mechanical method for the on-site evaluation of the elastic modulus of concrete. It is based on a modification of the well-known pull-out test, which is currently used for the estimation of concrete strength. The method consists in pulling out a metal insert embedded in the concrete mass and measuring the force-displacement curve consequent to the extraction. Three displacement transducers were used in order to correctly detect the displacement of the insert. Moreover, an adequate number of loading-unloading cycles was performed in order to stabilize the system and eliminate possible phenomena of mutual sliding between the mechanical parts of the apparatus and between the insert and the concrete mass.

By performing a certain number of pull-out tests the stiffness value of the system is obtained. The material deformability is then estimated through an appropriate correlation curve between pull-out stiffness and elastic modulus, which has been worked out on the basis of finite element simulations and experimental results. The proposed method offers interesting possibilities of application for the characterization of existing structures at affordable costs.

Keywords

pull-out concrete elastic modulus on-site structural identification diagnostics

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References

Yener

Chen

W. F.

On in-place strength of concrete and pullout tests

Cement, Concrete and Aggregates, 1984, 6(2), 96–99.

Malhotra

V. M.

Carrette

Omparison of pullout strength of concrete with compressive strength of cylinders and cores

ACIJ., Proc., 1980, 77(3), 161–170.

Ottosen

N. S.

Nonlinear finite element analysis of pull-out test

J. Structural Div., ASCE, 1981, 107(ST4), 591–603.

Bocca

Indagine teorico - sperimentale sulla determi-nazione della resistenza del calcestruzzo mediante prova di estrazione, L'Industria Italiana del Cemento, 1979, 1, 45–52.

Bickley

J. A.

The variability of the pullout tests and inplace concrete strength

Concrete Int.: Des. Constr., 1982, 4(4), 44–51.

Bocca

The application of pull-out test to high strength concrete estimation

Mater. Structs, 1984, 17(99), 211–216.

Stone

W. C.

Carino

N. J.

Reeve

C. P.

Statistical methods for in-place strength predictions by the pullout test

ACI J., Proc., 1986, 745–756.

Bocca

Cadoni

Valente

On concrete fatigue fracture in pull-out tests In Proceedings of the 2nd International Conference on Fracture and damage of concrete and rock, Vienna, Austria, 1992, pp. 637–646.