Document Archives

Statistical Methods for In-Plane Strength Predictions by the Pullout Test

• ID:

  596

• ESCSI:

  4251.033

• Author:

  Stone, William C.; Carino, Nicholas J.; Reeve, Charles P.

• Publication Name:

  Journal Amer. Concrete Inst.

• Type of Publication:

  Journal

• Publisher:

• Dated:

  1986

• Issue/Volume:

  Sept-Oct., Vol. 83, No. 5

• Other ID:

• Page(s):

  745-756

• Reference List:

  Y

• Abstract:

  Pullout tests and companion cylinder tests were conducted to examine variations in ultimate load with respect to concrete strength, and to provide experimental data for the development of a new statistical procedure for predicting in-place compressive strength from the pullout test. The coefficients of variation were found to be relatively constant with average values of 4 percent for cylinder tests and approximately 10 percent for pullout tests in concrete with hard coarse aggregates. Pullout tests in lightweight concrete exhibited coefficients of variation of only 6 percent. Two test series were conducted with river gravel aggregate using apex angles of 54 and 70 deg. A statistical procedure is developed for determining the correlation equation which accounts for: (1) the constant coefficients of variation in ultimate load, and (2) the x-variable (pullout load) error. A method is presented to determine the appropriate number of in-place tests to be performed for a given concrete placement. A recommended minimum number of 8 to 12 pullout tests per 76 meters (100 cubic yards) is proposed.