Properties of Sand-Mix Shotcrete

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Title: Properties of Sand-Mix Shotcrete

Author(s): Stanley G. Zynda

Publication: Special Publication

Volume: 14

Issue:

Appears on pages(s): 155-164

Keywords:

Date: 3/1/1978

Abstract:
Proportions of shotcrete mortar as mixed are compared with proportions of the mix in place. Effect of nozzle velocity on density of the in-place material is explained. Data on unit weight and compressive strength of various mixes are given, noting how test results based on shot cylinders differ from strength tests of cores from actual structural applications. Total water content for any given com-bination of shotcrete mortar materials is constant regardless of mix proportions, provided that the material is placed at the wettest stable consistency-the point of incipient sag. Maximum density in any mix occurs at this water content; hence it is also the point of maximum compressive strength.