Strength Evaluation of Early Age Shotcrete

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Title: Strength Evaluation of Early Age Shotcrete

Author(s): L. R. Prudencio, Jr.

Publication: Special Publication

Volume: 128

Issue:

Appears on pages(s): 273-288

Keywords: compressive strength; measuring instruments; mix proportioning; rheological properties; shotcrete; tests; Materials Research L. R. PRUDENCIO, JR

Date: 11/1/1991

Abstract:
The evaluation of early-age strength of shotcrete is very important for some kinds of applications, for example, tunnel linings. However, until now there has been no suitable procedure for this purpose. This paper provides information on a test program carried out to establish an experimental procedure to evaluate the compressive strength of shotcrete at early age (to 8 MPa). Results obtained using the Meynadier needle and the constant energy penetrometer are shown. The first test was employed for very low-strength concrete (less than MPa) and the second covered a higher range (1 to 10 MPa). The influence of mixture proportions on the test results was evaluated.